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• Is there any seriously good reason why a view can not completely manage itself?

  - by mystify

  Example: I have an warning triangle icon, which is a UIImageView subclass. That warning is blended in with an animation, pulses for 3 seconds and then fades out. it always has a parent view! it's always only used this way: alloc, init, add as subview, kick off animation, when done:remove from superview So I want this: [WarningIcon warningAtPosition:CGPointMake(50.0f, 100.0f) parentView:self]; BANG! That's it. Call and forget. The view adds itself as subview to the parent, then does it's animations. And when done, it cuts itself off from the branch with [self removeFromSupeview];. Now some nerd a year ago told me: "Never cut yourself off from your own branch". In other words: A view should never ever remove itself from superview if it's no more referenced anywhere. I want to get it, really. WHY? Think about this: The hard way, I would do actually the exact same thing. Create an instance and hang me in as delegate, kick off the animation, and when the warning icon is done animating, it calls me back "hey man i'm done, get rid of me!" - so my delegate method is called with an pointer to that instance, and I do the exact same thing: [thatWarningIcon removeFromSuperview]; - BANG. Now I'd really love to know why this sucks. Life would be so easy.

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• UDP packets are dropped when its size is less than 12 byte in a certain PC. how do i figure it out the reason?

  - by waan

  Hi. i've stuck in a problem that is never heard about before. i'm making an online game which uses UDP packets in a certain character action. after i developed the udp module, it seems to work fine. though most of our team members have no problem, but a man, who is my boss, told me something is wrong for that module. i have investigated the problem, and finally i found the fact that... on his PC, if udp packet size is less than 12, the packet is never have been delivered to the other host. the following is some additional information: 1~11 bytes udp packets are dropped, 12 bytes and over 12 bytes packets are OK. O/S: Microsoft Windows Vista Business NIC: Attansic L1 Gigabit Ethernet 10/100/1000Base-T Controller WSASendTo returns TRUE. loopback udp packet works fine. how do you think of this problem? and what do you think... what causes this problem? what should i do for the next step for the cause? PS. i don't want to padding which makes length of all the packets up to 12 bytes.

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• Yet another question about C++ books..

  - by suicideducky

  Intro rant Hey all, so after just over a year of browsing I decided it's time to ask a question for myself, it's sadly similar to many that have been asked before. I'm 18, am studying towards a BSc in Comp SCi and have been programming 'on and off' for about 6 years now, after wrestling with C++ for a bit then stumbling upon (and reading cover to cover) "Programming: Principles and Practice Using C++" by the great man himself I feel pretty comfortable with C++, I am almost finished writing my first open source program in C++ (a mediawiki parser, http://code.google.com/p/apertium-mediawiki/). I have decided I want to really get to know the power of C++, get familiar with some of its 'darker' corners and also delve into game programming, at this point I am rather keen on the book "Essential 3D Game Programming: with C++ and OpenGL" (released 24 may '10), I would also like to get 1 or 2 other books on 'general C++' that I can read cover to cover during my spare time. At this point I am pretty open to suggestions I would like something in the intermediate/advanced zone, some books I am rather keen on include: The C++ Standard Library: A tutorial and reference, C++ Template, the complete guide, and Modern C++ Design: Generic Programming and Design Patterns Applied Thanks in advance.

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• find, excluding dir, not descending into dir, AND using maxdepth and mindepth

  - by user1680819

  This is RHEL 5.6 and GNU find 4.2.27. I am trying to exclude a directory from find, and want to make sure that directory isn't descended into. I've seen plenty of posts saying -prune will do this - and it does. I can run this command: find . -type d -name "./.snapshot*" -prune -o -print and it works. I run it through strace and verify it is NOT descending into .snapshot. I also want to find directories ONLY at a certain level. I can use mindepth and maxdepth to do this: find . -maxdepth 8 -mindepth 8 -type d and it gives me all the dirs 8 levels down, including what's in .snapshot. If I combine the prune and mindepth and maxdepth options: find . -maxdepth 8 -mindepth 8 -type d \( -path "./.snapshot/*" -prune -o -print \) the output is right - I see all the dirs 8 levels down except for what's in .snapshot, but if I run that find through strace, I see that .snapshot is still being descended into - to levels 1 through 8. I've tried a variety of different combinations, moving the precedence parens around, reording expression components - everything that yields the right output still descends into .snapshot. I see in the man page that -prune doesn't work with -depth, but doesn't say anything about mindepth and maxdepth. Can anyone offer any advice? Thanks... Bill

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• Which DVCS would work best on Windows for my scenario?

  - by PoorLuzer

  At work I use ClearCase and SourceSafe, but have found some time to do some time to code for myself enroute thanks to a disposable laptop. However, I wish I had a lightweight VCS on my system using which I would be able to make changes to my code during the commute and then push/grab them from my Linux systems. I use git on my home system, but I can't really get it working on Windows. I don't want all that cygwin hack. If it does not run natively on Windows, it just won't do. What have you guys tried on your Windows system? Something that YOU use. The big player at the moment seems to be Mercurial? What would be best for a one (or maybe two) man team? I just need to maintain : Versioned copies of source code. Checking in and out should be as less obtrusive as possible. I am looking forward to a multiple Undo kind of feature (like that in an EMacs buffer) but persistent. I really like the way git keeps track of lines moving between files in a source code set I should be able to move part(s)/sub tree(s) of the source tree (each sub tree implies a module/plugin to my the main software I am building) to an archival system either completly or partially and restore them back from the archive as and when required and the system should track any changes to this tree as well. I actually want to experiment with my code as much as possible without me manually keeping track of what I modified and what I need to undo once I try out some idea, so that I am back to where I want to continue from. Notes : A similar topic came up a year ago : http://stackoverflow.com/questions/4670/dvcs-choices-whats-good-for-windows I hope things have changed, and I really want people to share their own, real life experiences. Not something they recommend without using it or they think will work.

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• Looking for an email/report templating engine with database backend - for end-users ...

  - by RizwanK

  We have a number of customers that we have to send monthly invoices too. Right now, I'm managing a codebase that does SQL queries against our customer database and billing database and places that data into emails - and sends it. I grow weary of maintaining this every time we want to include a new promotion or change our customer service phone numbers. So, I'm looking for a replacement to move more of this into the hands of those requesting the changes. In my ideal world, I need : A WYSIWYG (man, does anyone even say that anymore?) email editor that generates templates based upon the output from a Database Query. The ability to drag and drop various fields from the database query into the email template. Display of sample email results with the database query. Web application, preferably not requiring IIS. Involve as little code as possible for the end-user, but allow basic functionality (i.e. arrays/for loops) Either comes with it's own email delivery engine, or writes output in a way that I can easily write a Python script to deliver the email. Support for generic Database Connectors. (I need MSSQL and MySQL) F/OSS So ... can anyone suggest a project like this, or some tools that'd be useful for rolling my own? (My current alternative idea is using something like ERB or Tenjin, having them write the code, but not having live-preview for the editor would suck...)

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• What does the Asterisk * mean in Objective-C?

  - by Thanks

  Is it true, that the Asterisk always means "Hey, that is a pointer!" And an Pointer always holds an memory adress? (Yes I know for the exception that a * is used for math operation) For Example: NSString* myString; or SomeClass* thatClass; or (*somePointerToAStruct).myStructComponent = 5; I feel that there is more I need to know about the Asterirsk (*) than that I use it when defining an Variable that is a pointer to a class. Because sometimes I already say in the declaration of an parameter that the Parameter variable is a pointer, and still I have to use the Asterisk in front of the Variable in order to access the value. That recently happened after I wanted to pass a pointer of an struct to a method in a way like [myObj myMethod:&myStruct], I could not access a component value from that structure even though my method declaration already said that there is a parameter (DemoStruct*)myVar which indeed should be already known as a pointer to that demostruct, still I had always to say: "Man, compiler. Listen! It IIISSS a pointer:" and write: (*myVar).myStructComponentX = 5; I really really really do not understand why I have to say that twice. And only in this case. When I use the Asterisk in context of an NSString* myString then I can just access myString however I like, without telling the compiler each time that it's a pointer. i.e. like using *myString = @"yep". It just makes no sense to me.

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• Pthread - setting scheduler parameters

  - by Andna

  I wanted to use read-writer locks from pthread library in a way, that writers have priority over readers. I read in my man pages that If the Thread Execution Scheduling option is supported, and the threads involved in the lock are executing with the scheduling policies SCHED_FIFO or SCHED_RR, the calling thread shall not acquire the lock if a writer holds the lock or if writers of higher or equal priority are blocked on the lock; otherwise, the calling thread shall acquire the lock. so I wrote small function that sets up thread scheduling options. void thread_set_up(int _thread) { struct sched_param *_param=malloc(sizeof (struct sched_param)); int *c=malloc(sizeof(int)); *c=sched_get_priority_min(SCHED_FIFO)+1; _param->__sched_priority=*c; long *a=malloc(sizeof(long)); *a=syscall(SYS_gettid); int *b=malloc(sizeof(int)); *b=SCHED_FIFO; if (pthread_setschedparam(*a,*b,_param) == -1) { //depending on which thread calls this functions, few thing can happen if (_thread == MAIN_THREAD) client_cleanup(); else if (_thread==ACCEPT_THREAD) { pthread_kill(params.main_thread_id,SIGINT); pthread_exit(NULL); } } } sorry for those a,b,c but I tried to malloc everything, still I get SIGSEGV on the call to pthread_setschedparam, I am wondering why?

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• Lost in Nodester Installation

  - by jslamka

  I am trying to install my own version of Nodester. I have tried on Ubuntu 12.04 LTS and now with CentOS. I am not the most skilled Linux user (~2 months use) so I am at a loss at this point. The instructions are located at https://github.com/nodester/nodester/wiki/Install-nodester#wiki-a. They ask you to "export paths (to make npm work)" with the lines necessary to accomplish this. cd ~ echo -e "root = ~/.node_libraries\nmanroot = ~/local/share/man\nbinroot = ~/bin" > ~/.npmrc echo -e "export PATH=3d9c7cfd35d3628e0aa233dec9ce9a44d2231afcquot;\${PATH}:~/bin3d9c7cfd35d3628e0aa233dec9ce9a44d2231afcquot;;" >> ~/.bashrc source ~/.bashrc I can accomplish all of this until I get to the source ~/.bashrc line. When I run that, I get the following: [root@MYSERVER ~]# source ~/.bashrc -bash: /root/.bashrc: line 13: syntax error near unexpected token ';;' -bash: /root/.bashrc: line 13: 'export PATH=3d9c7cfd35d3628e0aa233dec9ce9a44d2231afcquot;${PATH}:~/bin3d9c7cfd35d3628e0aa233dec9ce9a44d2231afcquot;; I have tried changing the quot; to " and that didn't help. I tried changing quot; to colons and that didn't help. I also removed that and it didn't help (I am sure many of you at this point are probably wondering why I would even try those things). Does anyone have any insight as to what I need to do to get this to run properly?

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• Compile Apache 2.4.3 on Centos 6.2 (64bit)

  - by RiseCakoPlusplus

  I attempt to compile Apache 2.4.3 with apr-1.4.6 and apr-util-1.5.1 on Centos 6.2 (64bit). ./configure --build=x86_64-unknown-linux-gnu --host=x86_64-unknown-linux-gnu --target=x86_64-redhat-linux-gnu --program-prefix= --prefix=/usr --exec-prefix=/usr --bindir=/usr/bin --sbindir=/usr/sbin --sysconfdir=/etc --datadir=/usr/share --includedir=/usr/include --libdir=/usr/lib64 --libexecdir=/usr/libexec --localstatedir=/var --sharedstatedir=/var/lib --mandir=/usr/share/man --infodir=/usr/share/info --cache-file=../config.cache --with-libdir=lib64 --with-config-file-path=/etc --with-config-file-scan-dir=/etc/php.d --disable-debug --with-pic --disable-rpath --without-pear --with-bz2 --with-exec-dir=/usr/bin --with-freetype-dir=/usr --with-png-dir=/usr --with-xpm-dir=/usr --enable-gd-native-ttf --with-t1lib=/usr --without-gdbm --with-gettext --with-gmp --with-iconv --with-jpeg-dir=/usr --with-openssl --with-zlib --with-layout=GNU --enable-exif --enable-ftp --enable-magic-quotes --enable-sockets --with-kerberos --enable-ucd-snmp-hack --enable-shmop --enable-calendar --with-libxml-dir=/usr --enable-xml --with-system-tzdata --with-mhash --with-apxs2=/usr/sbin/apxs --libdir=/usr/lib64/php --enable-pdo=shared --with-mysql=shared,/usr --with-mysqli=shared,/usr/lib64/mysql/mysql_config --with-pdo-mysql=shared,/usr/lib64/mysql/mysql_config --without-pdo-sqlite --without-gd --disable-dom --disable-dba --without-unixODBC --disable-xmlreader --disable-xmlwriter --without-sqlite3 --disable-phar --disable-fileinfo --disable-json --without-pspell --disable-wddx --without-curl --disable-posix --disable-sysvmsg --disable-sysvshm --disable-sysvsem ./configure --with-included-apr --with-included-apr-util and when I issue make this happen: /root/httpd-2.4.3/srclib/apr/libtool: line 5989: cd: yes/lib: No such file or directory libtool: link: cannot determine absolute directory name of yes/lib' make[3]: *** [libaprutil-1.la] Error 1 make[3]: Leaving directory/root/httpd-2.4.3/srclib/apr-util' make[2]: * [all-recursive] Error 1 make[2]: Leaving directory /root/httpd-2.4.3/srclib/apr-util' make[1]: *** [all-recursive] Error 1 make[1]: Leaving directory/root/httpd-2.4.3/srclib' make: * [all-recursive] Error 1 anything I missed?

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• Operator Overloading << in c++

  - by thlgood

  I'm a fresh man in C++. I write this simple program to practice Overlaoding. This is my code: #include <iostream> #include <string> using namespace std; class sex_t { private: char __sex__; public: sex_t(char sex_v = 'M'):__sex__(sex_v) { if (sex_v != 'M' && sex_v != 'F') { cerr << "Sex type error!" << sex_v << endl; __sex__ = 'M'; } } const ostream& operator << (const ostream& stream) { if (__sex__ == 'M') cout << "Male"; else cout << "Female"; return stream; } }; int main(int argc, char *argv[]) { sex_t me('M'); cout << me << endl; return 0; } When I compiler it, It print a lots of error message: The error message was in a mess. It's too hard for me to found useful message sex.cpp: ???‘int main(int, char**)’?: sex.cpp:32:10: ??: ‘operator<<’?‘std::cout << me’????? sex.cpp:32:10: ??: ???: /usr/include/c++/4.6/ostream:110:7: ??: std::basic_ostream<_CharT, _Traits>::__ostream_type& std::basic_ostream<_CharT, _Traits>::operator<<(std::basic_ostre

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• C++: how serialize/deserialize objects without any library?

  - by Winte Winte

  I try to understand how serializing/deserializing works in c++, so I want to do that without any libs. But I really stuck with that. I start with simple objects but when I try to deserilize a vector I understand that I can't get a vector without if I don't write it size before. Moreover, I don't know which format of file I should choose because if digits will be existed before size of vector I haven't chance to read it right. However it is only the vector but I also want to do that with classes and map container. My task is serialize/deserialize a objects as this: PersonInfo { unsigned int age_; string name_; enum { undef, man, woman } sex_; } Person : PersonInfo { vector<Person> children_; map<string, PersonInfo> addrBook_; } Currently I know how to serialize simple objects in way as this: vector<PersonInfo> vecPersonInfo; vecPersonInfo.push_back(*personInfo); vecPersonInfo.push_back(*oneMorePersonInfo); ofstream file("file", ios::out | ios::binary); if (!file) { cout<<"can not open file"; } else { vector<PersonInfo>::const_iterator iterator = vecPersonInfo.begin(); for (; iterator != vecPersonInfo.end(); iterator++) { file<<*iterator; } Could you please suggest how I can do this for this conplex object or a good tutorial that explain it clearly?

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• Test All Features of Windows Phone 7 On Your PC

  - by Matthew Guay

  Are you developer or just excited about the upcoming Windows Phone 7, and want to try it out now?  Thanks to free developer tools from Microsoft and a new unlocked emulator rom, you can try out most of the exciting features today from your PC. Last week we showed you how to try out Windows Phone 7 on your PC and get started developing for the upcoming new devices.  We noticed, however, that the emulator only contains Internet Explorer Mobile and some settings.  This is still interesting to play around with, but it wasn’t the full Windows Phone 7 experience. Some enterprising tweakers discovered that more applications were actually included in the emulator, but were simply hidden from users.  Developer Dan Ardelean then figured out how to re-enable these features, and released a tweaked emulator rom so everyone can try out all of the Windows Phone 7 features for themselves.  Here we’ll look at how you can run this new emulator image on your PC, and then look at some interesting features in Windows Phone 7. Editor Note: This modified emulator image is not official, and isn’t sanctioned by Microsoft. Use your own judgment when choosing to download and use the emulator. Setting Up Emulator Rom To test-drive Windows Phone 7 on your PC, you must first download and install the Windows Phone Developer Tools CTP (link below).  Follow the steps we showed you last week at: Try out Windows Phone 7 on your PC today.  Once it’s installed, go ahead and run the default emulator as we showed to make sure everything works ok. Once the Windows Phone Developer Tools are installed and running, download the new emulator rom from XDA Forums (link below).  This will be a zip file, so extract it first. Note where you save the file, as you will need the address in the next step. Now, to run our new emulator image, we need to open the emulator in command line and point to the new rom image.  To do this, browse to the correct directory, depending on whether you’re running the 32 bit or 64 bit version of Windows: 32 bit: C:\Program Files\Microsoft XDE\1.0\ 64 bit: C:\Program Files (x86)\Microsoft XDE\1.0\ Hold your Shift key down and right-click in the folder.  Choose Open Command Window here. At the command prompt, enter XDE.exe followed by the location of your new rom image.  Here, we downloaded the rom to our download folder, so at the command prompt we entered: XDE.exe C:\Users\Matthew\Downloads\WM70Full\WM70Full.bin The emulator loads … with the full Windows Phone 7 experience! To make it easier, let’s make a shortcut on our desktop to load the emulator with the new rom directly.  Right-click on your desktop (or any folder you want to create the shortcut in), select New, and then Shortcut. Now, in the box, we need to enter the path for the emulator followed by the location of our rom.  Both items must be in quotes.  So, in our test, we entered the following: 32 bit: “C:\Program Files\Microsoft XDE\1.0\” “C:\Users\Matthew\Downloads\WM70Full\WM70Full.bin” 64 bit: “C:\Program Files (x86)\Microsoft XDE\1.0\” “C:\Users\Matthew\Downloads\WM70Full\WM70Full.bin” Make sure to enter the correct location of the new emulator rom for your computer, and keep both items in separate quotes.  Click next when you’ve entered the location. Name the shortcut; we named it Windows Phone 7, but simply enter whatever you’d like.  Click Finish when you’re done. You should now have a nice Windows Phone icon and your fully functional shortcut!  Double-click it to run the Windows Phone 7 emulator as above. Features in the Unlocked Windows Phone 7 Emulator So let’s look at what you can do with this new emulator.  Almost everything you’ve seen in demos from the Mobile World Conference and Mix’10 are right here for you to play with.  Here’s the application menu, which you can access by clicking on the arrow on the top of the home screen, which shows how much stuff they’ve got in this!   And, of course, even the home screen itself shows much more activity than it did in the original emulator. Let’s check out some of these sections.  Here’s Zune running on Windows Phone 7, and the Zune Marketplace.  The animations are beautiful, so be sure to check this out yourself. The new picture hub is much nicer than any picture viewer included with Windows Mobile in the past…   Stay productive, and on schedule with the new Calendar. The XBOX hub gives us only a hint of things to come, and the links to games now are simply placeholders. Here’s a look at the Office hub.  This doesn’t show up on the homescreen right now, but you can access it in the applications menu.  Office obviously still has a lot of work left on it, but even at a glance here it looks like it includes a lot more functionality than Office Mobile in Windows Mobile 6. Here’s a look at each of the three apps: Word, Excel, and OneNote, and the formatting pallet in Office apps.   This emulator also includes a lot more settings than the default one, including settings for individual applications. You can even activate the screen lock, and try out the lift-to-peek-or-unlock feature… Finally, this version of Windows Phone 7 includes a very nice SystemInfo app with an advanced task manager.  We hope this is still available when the actual phones are released. Conclusion If you’re excited about the upcoming Windows Phone 7 series, or simply want to learn more about what’s coming, this is a great way to test it out.  With these exciting new hubs and applications, there’s something here for everyone.  Let us know what you like most about Windows Phone 7 and what your favorite app or hub is. Links Please note: These roms are not officially supported by Microsoft, and could be taken down. Download the unlocked Windows Phone 7 emulator from XDA Forums – click the link in this post to download How the unlocked emulator image was created Similar Articles Productive Geek Tips Try out Windows Phone 7 on your PC todayGet stats on your Ruby on Rails codeDisable Windows Vista’s Built-in CD/DVD Burning FeaturesWeek in Geek – The Slick Windows 7 File Copy Animation EditionGeek Fun: Virtualized Old School Windows – Windows 95 TouchFreeze Alternative in AutoHotkey The Icy Undertow Desktop Windows Home Server – Backup to LAN The Clear & Clean Desktop Use This Bookmarklet to Easily Get Albums Use AutoHotkey to Assign a Hotkey to a Specific Window Latest Software Reviews Tinyhacker Random Tips Revo Uninstaller Pro Registry Mechanic 9 for Windows PC Tools Internet Security Suite 2010 PCmover Professional Get Better Windows Search With UltraSearch Scan News With NY Times Article Skimmer SpeedyFox Claims to Speed up your Firefox Beware Hover Kitties Test Drive Mobile Phones Online With TryPhone Ben & Jerry’s Free Cone Day, 3/23/10

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• Solaris 11 Launch Blog Carnival Roundup

  - by constant

  Solaris 11 is here! And together with the official launch activities, a lot of Oracle and non-Oracle bloggers contributed helpful and informative blog articles to help your datacenter go to eleven. Here are some notable blog postings, sorted by category for your Solaris 11 blog-reading pleasure: Getting Started/Overview A lot of people speculated that the official launch of Solaris 11 would be on 11/11 (whatever way you want to turn it), but it actually happened two days earlier. Larry Wake himself offers 11 Reasons Why Oracle Solaris 11 11/11 Isn't Being Released on 11/11/11. Then, Larry goes on with a summary: Oracle Solaris 11: The First Cloud OS gives you a short and sweet rundown of what the major new features of Solaris 11 are. Jeff Victor has his own list of What's New in Oracle Solaris 11. A popular Solaris 11 meme is to write a blog post about 11 favourite features: Jim Laurent's 11 Reasons to Love Solaris 11, Darren Moffat's 11 Favourite Solaris 11 Features, Mike Gerdt's 11 of My Favourite Things! are just three examples of "11 Favourite Things..." type blog posts, I'm sure many more will follow... More official overview content for Solaris 11 is available from the Oracle Tech Network Solaris 11 Portal. Also, check out Rick Ramsey's blog post Solaris 11 Resources for System Administrators on the OTN Blog and his secret 5 Commands That Make Solaris Administration Easier post from the OTN Garage. (Automatic) Installation and the Image Packaging System (IPS) The brand new Image Packaging System (IPS) and the Automatic Installer (IPS), together with numerous other install/packaging/boot/patching features are among the most significant improvements in Solaris 11. But before installing, you may wonder whether Solaris 11 will support your particular set of hardware devices. Again, the OTN Garage comes to the rescue with Rick Ramsey's post How to Find Out Which Devices Are Supported By Solaris 11. Included is a useful guide to all the first steps to get your Solaris 11 system up and running. Tim Foster had a whole handful of blog posts lined up for the launch, teaching you everything you need to know about IPS but didn't dare to ask: The IPS System Repository, IPS Self-assembly - Part 1: Overlays and Part 2: Multiple Packages Delivering Configuration. Watch out for more IPS posts from Tim! If installing packages or upgrading your system from the net makes you uneasy, then you're not alone: Jim Laurent will tech you how Building a Solaris 11 Repository Without Network Connection will make your life easier. Many of you have already peeked into the future by installing Solaris 11 Express. If you're now wondering whether you can upgrade or whether a fresh install is necessary, then check out Alan Hargreaves's post Upgrading Solaris 11 Express b151a with support to Solaris 11. The trick is in upgrading your pkg(1M) first. Networking One of the first things to do after installing Solaris 11 (or any operating system for that matter), is to set it up for networking. Solaris 11 comes with the brand new "Network Auto-Magic" feature which can figure out everything by itself. For those cases where you want to exercise a little more control, Solaris 11 left a few people scratching their heads. Fortunately, Tschokko wrote up this cool blog post: Solaris 11 manual IPv4 & IPv6 configuration right after the launch ceremony. Thanks, Tschokko! And Milek points out a long awaited networking feature in Solaris 11 called Solaris 11 - hostmodel, which I know for a fact that many customers have looked forward to: How to "bind" a Solaris 11 system to a specific gateway for specific IP address it is using. Steffen Weiberle teaches us how to tune the Solaris 11 networking stack the proper way: ipadm(1M). No more fiddling with ndd(1M)! Check out his tutorial on Solaris 11 Network Tunables. And if you want to get even deeper into the networking stack, there's nothing better than DTrace. Alan Maguire teaches you in: DTracing TCP Congestion Control how to probe deeply into the Solaris 11 TCP/IP stack, the TCP congestion control part in particular. Don't miss his other DTrace and TCP related blog posts! DTrace And there we are: DTrace, the king of all observability tools. Long time DTrace veteran and co-author of The DTrace book*, Brendan Gregg blogged about Solaris 11 DTrace syscall provider changes. BTW, after you install Solaris 11, check out the DTrace toolkit which is installed by default in /usr/dtrace/DTT. It is chock full of handy DTrace scripts, many of which contributed by Brendan himself! Security Another big theme in Solaris 11, and one that is crucial for the success of any operating system in the Cloud is Security. Here are some notable posts in this category: Darren Moffat starts by showing us how to completely get rid of root: Completely Disabling Root Logins on Solaris 11. With no root user, there's one major entry point less to worry about. But that's only the start. In Immutable Zones on Encrypted ZFS, Darren shows us how to double the security of your services: First by locking them into the new Immutable Zones feature, then by encrypting their data using the new ZFS encryption feature. And if you're still missing sudo from your Linux days, Darren again has a solution: Password (PAM) caching for Solaris su - "a la sudo". If you're wondering how much compute power all this encryption will cost you, you're in luck: The Solaris X86 AESNI OpenSSL Engine will make sure you'll use your Intel's embedded crypto support to its fullest. And if you own a brand new SPARC T4 machine you're even luckier: It comes with its own SPARC T4 OpenSSL Engine. Dan Anderson's posts show how there really is now excuse not to encrypt any more... Developers Solaris 11 has a lot to offer to developers as well. Ali Bahrami has a series of blog posts that cover diverse developer topics: elffile: ELF Specific File Identification Utility, Using Stub Objects and The Stub Proto: Not Just For Stub Objects Anymore to name a few. BTW, if you're a developer and want to shape the future of Solaris 11, then Vijay Tatkar has a hint for you: Oracle (Sun Systems Group) is hiring! Desktop and Graphics Yes, Solaris 11 is a 100% server OS, but it can also offer a decent desktop environment, especially if you are a developer. Alan Coopersmith starts by discussing S11 X11: ye olde window system in today's new operating system, then Calum Benson shows us around What's new on the Solaris 11 Desktop. Even accessibility is a first-class citizen in the Solaris 11 user interface. Peter Korn celebrates: Accessible Oracle Solaris 11 - released! Performance Gone are the days of "Slowaris", when Solaris was among the few OSes that "did the right thing" while others cut corners just to win benchmarks. Today, Solaris continues doing the right thing, and it delivers the right performance at the same time. Need proof? Check out Brian's BestPerf blog with continuous updates from the benchmarking lab, including Recent Benchmarks Using Oracle Solaris 11! Send Me More Solaris 11 Launch Articles! These are just a few of the more interesting blog articles that came out around the Solaris 11 launch, I'm sure there are many more! Feel free to post a comment below if you find a particularly interesting blog post that hasn't been listed so far and share your enthusiasm for Solaris 11! *Affiliate link: Buy cool stuff and support this blog at no extra cost. We both win! var flattr_uid = '26528'; var flattr_tle = 'Solaris 11 Launch Blog Carnival Roundup'; var flattr_dsc = '<strong>Solaris 11 is here!</strong>And together with the official launch activities, a lot of Oracle and non-Oracle bloggers contributed helpful and informative blog articles to help your datacenter <a href="http://en.wikipedia.org/wiki/Up_to_eleven">go to eleven</a>.Here are some notable blog postings, sorted by category for your Solaris 11 blog-reading pleasure:'; var flattr_tag = 'blogging,digest,Oracle,Solaris,solaris,solaris 11'; var flattr_cat = 'text'; var flattr_url = 'http://constantin.glez.de/blog/2011/11/solaris-11-launch-blog-carnival-roundup'; var flattr_lng = 'en_GB'

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• Interesting articles and blogs on SPARC T4

  - by mv

  Interesting articles and blogs on SPARC T4 processor   I have consolidated all the interesting information I could get on SPARC T4 processor and its hardware cryptographic capabilities.  Hope its useful. 1. Advantages of SPARC T4 processor  Most important points in this T4 announcement are : "The SPARC T4 processor was designed from the ground up for high speed security and has a cryptographic stream processing unit (SPU) integrated directly into each processor core. These accelerators support 16 industry standard security ciphers and enable high speed encryption at rates 3 to 5 times that of competing processors. By integrating encryption capabilities directly inside the instruction pipeline, the SPARC T4 processor eliminates the performance and cost barriers typically associated with secure computing and makes it possible to deliver high security levels without impacting the user experience." Data Sheet has more details on these  : "New on-chip Encryption Instruction Accelerators with direct non-privileged support for 16 industry-standard cryptographic algorithms plus random number generation in each of the eight cores: AES, Camellia, CRC32c, DES, 3DES, DH, DSA, ECC, Kasumi, MD5, RSA, SHA-1, SHA-224, SHA-256, SHA-384, SHA-512" I ran "isainfo -v" command on Solaris 11 Sparc T4-1 system. It shows the new instructions as expected  : $ isainfo -v 64-bit sparcv9 applications crc32c cbcond pause mont mpmul sha512 sha256 sha1 md5 camellia kasumi des aes ima hpc vis3 fmaf asi_blk_init vis2 vis popc 32-bit sparc applications crc32c cbcond pause mont mpmul sha512 sha256 sha1 md5 camellia kasumi des aes ima hpc vis3 fmaf asi_blk_init vis2 vis popc v8plus div32 mul32  2.  Dan Anderson's Blog have some interesting points about how these can be used : "New T4 crypto instructions include: aes_kexpand0, aes_kexpand1, aes_kexpand2,         aes_eround01, aes_eround23, aes_eround01_l, aes_eround_23_l, aes_dround01, aes_dround23, aes_dround01_l, aes_dround_23_l.       Having SPARC T4 hardware crypto instructions is all well and good, but how do we access it ?      The software is available with Solaris 11 and is used automatically if you are running Solaris a SPARC T4.  It is used internally in the kernel through kernel crypto modules.  It is available in user space through the PKCS#11 library." 3.   Dans' Blog on Where's the Crypto Libraries? Although this was written in 2009 but still is very useful  "Here's a brief tour of the major crypto libraries shown in the digraph:   The libpkcs11 library contains the PKCS#11 API (C_\*() functions, such as C_Initialize()). That in turn calls library pkcs11_softtoken or pkcs11_kernel, for userland or kernel crypto providers. The latter is used mostly for hardware-assisted cryptography (such as n2cp for Niagara2 SPARC processors), as that is performed more efficiently in kernel space with the "kCF" module (Kernel Crypto Framework). Additionally, for Solaris 10, strong crypto algorithms were split off in separate libraries, pkcs11_softtoken_extra libcryptoutil contains low-level utility functions to help implement cryptography. libsoftcrypto (OpenSolaris and Solaris Nevada only) implements several symmetric-key crypto algorithms in software, such as AES, RC4, and DES3, and the bignum library (used for RSA). libmd implements MD5, SHA, and SHA2 message digest algorithms" 4. Difference in T3 and T4 Diagram in this blog is good and self explanatory. Jeff's blog also highlights the differences  "The T4 servers have improved crypto acceleration, described at https://blogs.oracle.com/DanX/entry/sparc_t4_openssl_engine. It is "just built in" so administrators no longer have to assign crypto accelerator units to domains - it "just happens". Every physical or virtual CPU on a SPARC-T4 has full access to hardware based crypto acceleration at all times. .... For completeness sake, it's worth noting that the T4 adds more crypto algorithms, and accelerates Camelia, CRC32c, and more SHA-x." 5. About performance counters In this blog, performance counters are explained : "Note that unlike T3 and before, T4 crypto doesn't require kernel modules like ncp or n2cp, there is no visibility of crypto hardware with kstats or cryptoadm. T4 does provide hardware counters for crypto operations.  You can see these using cpustat: cpustat -c pic0=Instr_FGU_crypto 5 You can check the general crypto support of the hardware and OS with the command "isainfo -v". Since T4 crypto's implementation now allows direct userland access, there are no "crypto units" visible to cryptoadm.  " For more details refer Martin's blog as well. 6. How to turn off  SPARC T4 or Intel AES-NI crypto acceleration  I found this interesting blog from Darren about how to turn off  SPARC T4 or Intel AES-NI crypto acceleration. "One of the new Solaris 11 features of the linker/loader is the ability to have a single ELF object that has multiple different implementations of the same functions that are selected at runtime based on the capabilities of the machine.   The alternate to this is having the application coded to call getisax(2) system call and make the choice itself.  We use this functionality of the linker/loader when we build the userland libraries for the Solaris Cryptographic Framework (specifically libmd.so and libsoftcrypto.so) The Solaris linker/loader allows control of a lot of its functionality via environment variables, we can use that to control the version of the cryptographic functions we run.  To do this we simply export the LD_HWCAP environment variable with values that tell ld.so.1 to not select the HWCAP section matching certain features even if isainfo says they are present.  This will work for consumers of the Solaris Cryptographic Framework that use the Solaris PKCS#11 libraries or use libmd.so interfaces directly.  For SPARC T4 : export LD_HWCAP="-aes -des -md5 -sha256 -sha512 -mont -mpul" .. For Intel systems with AES-NI support: export LD_HWCAP="-aes"" Note that LD_HWCAP is explained in  http://docs.oracle.com/cd/E23823_01/html/816-5165/ld.so.1-1.html "LD_HWCAP, LD_HWCAP_32, and LD_HWCAP_64 -  Identifies an alternative hardware capabilities value... A “-” prefix results in the capabilities that follow being removed from the alternative capabilities." 7. Whitepaper on SPARC T4 Servers—Optimized for End-to-End Data Center Computing This Whitepaper on SPARC T4 Servers—Optimized for End-to-End Data Center Computing explains more details.  It has DTrace scripts which may come in handy : "To ensure the hardware-assisted cryptographic acceleration is configured to use and working with the security scenarios, it is recommended to use the following Solaris DTrace script. #!/usr/sbin/dtrace -s pid$1:libsoftcrypto:yf*:entry, pid$target:libsoftcrypto:rsa*:entry, pid$1:libmd:yf*:entry { @[probefunc] = count(); } tick-1sec { printa(@ops); trunc(@ops); }" Note that I have slightly modified the D Script to have RSA "libsoftcrypto:rsa*:entry" as well as per recommendations from Chi-Chang Lin. 8. References http://www.oracle.com/us/corporate/features/sparc-t4-announcement-494846.html http://www.oracle.com/us/products/servers-storage/servers/sparc-enterprise/t-series/sparc-t4-1-ds-487858.pdf https://blogs.oracle.com/DanX/entry/sparc_t4_openssl_engine https://blogs.oracle.com/DanX/entry/where_s_the_crypto_libraries https://blogs.oracle.com/darren/entry/howto_turn_off_sparc_t4 http://docs.oracle.com/cd/E23823_01/html/816-5165/ld.so.1-1.html   https://blogs.oracle.com/hardware/entry/unleash_the_power_of_cryptography https://blogs.oracle.com/cmt/entry/t4_crypto_cheat_sheet https://blogs.oracle.com/martinm/entry/t4_performance_counters_explained  https://blogs.oracle.com/jsavit/entry/no_mau_required_on_a http://www.oracle.com/us/products/servers-storage/servers/sparc-enterprise/t-series/sparc-t4-business-wp-524472.pdf

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• Base de Datos Oracle, su mejor opción para reducir costos de IT

  - by Ivan Hassig

  Por Victoria Cadavid Sr. Sales Cosultant Oracle Direct Uno de los principales desafíos en la administración de centros de datos es la reducción de costos de operación. A medida que las compañías crecen y los proveedores de tecnología ofrecen soluciones cada vez más robustas, conservar el equilibrio entre desempeño, soporte al negocio y gestión del Costo Total de Propiedad es un desafío cada vez mayor para los Gerentes de Tecnología y para los Administradores de Centros de Datos. Las estrategias más comunes para conseguir reducción en los costos de administración de Centros de Datos y en la gestión de Tecnología de una organización en general, se enfocan en la mejora del desempeño de las aplicaciones, reducción del costo de administración y adquisición de hardware, reducción de los costos de almacenamiento, aumento de la productividad en la administración de las Bases de Datos y mejora en la atención de requerimientos y prestación de servicios de mesa de ayuda, sin embargo, las estrategias de reducción de costos deben contemplar también la reducción de costos asociados a pérdida y robo de información, cumplimiento regulatorio, generación de valor y continuidad del negocio, que comúnmente se conciben como iniciativas aisladas que no siempre se adelantan con el ánimo de apoyar la reducción de costos. Una iniciativa integral de reducción de costos de TI, debe contemplar cada uno de los factores que  generan costo y pueden ser optimizados. En este artículo queremos abordar la reducción de costos de tecnología a partir de la adopción del que según los expertos es el motor de Base de Datos # del mercado.Durante años, la base de datos Oracle ha sido reconocida por su velocidad, confiabilidad, seguridad y capacidad para soportar cargas de datos tanto de aplicaciones altamente transaccionales, como de Bodegas de datos e incluso análisis de Big Data , ofreciendo alto desempeño y facilidades de administración, sin embrago, cuando pensamos en proyectos de reducción de costos de IT, además de la capacidad para soportar aplicaciones (incluso aplicaciones altamente transaccionales) con alto desempeño, pensamos en procesos de automatización, optimización de recursos, consolidación, virtualización e incluso alternativas más cómodas de licenciamiento. La Base de Datos Oracle está diseñada para proveer todas las capacidades que un área de tecnología necesita para reducir costos, adaptándose a los diferentes escenarios de negocio y a las capacidades y características de cada organización.Es así, como además del motor de Base de Datos, Oracle ofrece una serie de soluciones para optimizar la administración de la información a través de mecanismos de optimización del uso del storage, continuidad del Negocio, consolidación de infraestructura, seguridad y administración automática, que propenden por un mejor uso de los recursos de tecnología, ofrecen opciones avanzadas de configuración y direccionan la reducción de los tiempos de las tareas operativas más comunes. Una de las opciones de la base de datos que se pueden provechar para reducir costos de hardware es Oracle Real Application Clusters. Esta solución de clustering permite que varios servidores (incluso servidores de bajo costo) trabajen en conjunto para soportar Grids o Nubes Privadas de Bases de Datos, proporcionando los beneficios de la consolidación de infraestructura, los esquemas de alta disponibilidad, rápido desempeño y escalabilidad por demanda, haciendo que el aprovisionamiento, el mantenimiento de las bases de datos y la adición de nuevos nodos se lleve e cabo de una forma más rápida y con menos riesgo, además de apalancar las inversiones en servidores de menor costo. Otra de las soluciones que promueven la reducción de costos de Tecnología es Oracle In-Memory Database Cache que permite almacenar y procesar datos en la memoria de las aplicaciones, permitiendo el máximo aprovechamiento de los recursos de procesamiento de la capa media, lo que cobra mucho valor en escenarios de alta transaccionalidad. De este modo se saca el mayor provecho de los recursos de procesamiento evitando crecimiento innecesario en recursos de hardware. Otra de las formas de evitar inversiones innecesarias en hardware, aprovechando los recursos existentes, incluso en escenarios de alto crecimiento de los volúmenes de información es la compresión de los datos. Oracle Advanced Compression permite comprimir hasta 4 veces los diferentes tipos de datos, mejorando la capacidad de almacenamiento, sin comprometer el desempeño de las aplicaciones. Desde el lado del almacenamiento también se pueden conseguir reducciones importantes de los costos de IT. En este escenario, la tecnología propia de la base de Datos Oracle ofrece capacidades de Administración Automática del Almacenamiento que no solo permiten una distribución óptima de los datos en los discos físicos para garantizar el máximo desempeño, sino que facilitan el aprovisionamiento y la remoción de discos defectuosos y ofrecen balanceo y mirroring, garantizando el uso máximo de cada uno de los dispositivos y la disponibilidad de los datos. Otra de las soluciones que facilitan la administración del almacenamiento es Oracle Partitioning, una opción de la Base de Datos que permite dividir grandes tablas en estructuras más pequeñas. Esta aproximación facilita la administración del ciclo de vida de la información y permite por ejemplo, separar los datos históricos (que generalmente se convierten en información de solo lectura y no tienen un alto volumen de consulta) y enviarlos a un almacenamiento de bajo costos, conservando la data activa en dispositivos de almacenamiento más ágiles. Adicionalmente, Oracle Partitioning facilita la administración de las bases de datos que tienen un gran volumen de registros y mejora el desempeño de la base de datos gracias a la posibilidad de optimizar las consultas haciendo uso únicamente de las particiones relevantes de una tabla o índice en el proceso de búsqueda. Otros factores adicionales, que pueden generar costos innecesarios a los departamentos de Tecnología son: La pérdida, corrupción o robo de datos y la falta de disponibilidad de las aplicaciones para dar soporte al negocio. Para evitar este tipo de situaciones que pueden acarrear multas y pérdida de negocios y de dinero, Oracle ofrece soluciones que permiten proteger y auditar la base de datos, recuperar la información en caso de corrupción o ejecución de acciones que comprometan la integridad de la información y soluciones que permitan garantizar que la información de las aplicaciones tenga una disponibilidad de 7x24. Ya hablamos de los beneficios de Oracle RAC, para facilitar los procesos de Consolidación y mejorar el desempeño de las aplicaciones, sin embrago esta solución, es sumamente útil en escenarios dónde las organizaciones de quieren garantizar una alta disponibilidad de la información, ante fallo de los servidores o en eventos de desconexión planeada para realizar labores de mantenimiento. Además de Oracle RAC, existen soluciones como Oracle Data Guard y Active Data Guard que permiten replicar de forma automática las bases de datos hacia un centro de datos de contingencia, permitiendo una recuperación inmediata ante eventos que deshabiliten por completo un centro de datos. Además de lo anterior, Active Data Guard, permite aprovechar la base de datos de contingencia para realizar labores de consulta, mejorando el desempeño de las aplicaciones. Desde el punto de vista de mejora en la seguridad, Oracle cuenta con soluciones como Advanced security que permite encriptar los datos y los canales a través de los cueles se comparte la información, Total Recall, que permite visualizar los cambios realizados a la base de datos en un momento determinado del tiempo, para evitar pérdida y corrupción de datos, Database Vault que permite restringir el acceso de los usuarios privilegiados a información confidencial, Audit Vault, que permite verificar quién hizo qué y cuándo dentro de las bases de datos de una organización y Oracle Data Masking que permite enmascarar los datos para garantizar la protección de la información sensible y el cumplimiento de las políticas y normas relacionadas con protección de información confidencial, por ejemplo, mientras las aplicaciones pasan del ambiente de desarrollo al ambiente de producción. Como mencionamos en un comienzo, las iniciativas de reducción de costos de tecnología deben apalancarse en estrategias que contemplen los diferentes factores que puedan generar sobre costos, los factores de riesgo que puedan acarrear costos no previsto, el aprovechamiento de los recursos actuales, para evitar inversiones innecesarias y los factores de optimización que permitan el máximo aprovechamiento de las inversiones actuales. Como vimos, todas estas iniciativas pueden ser abordadas haciendo uso de la tecnología de Oracle a nivel de Base de Datos, lo más importante es detectar los puntos críticos a nivel de riesgo, diagnosticar las proporción en que están siendo aprovechados los recursos actuales y definir las prioridades de la organización y del área de IT, para así dar inicio a todas aquellas iniciativas que de forma gradual, van a evitar sobrecostos e inversiones innecesarias, proporcionando un mayor apoyo al negocio y un impacto significativo en la productividad de la organización. Más información http://www.oracle.com/lad/products/database/index.html?ssSourceSiteId=otnes 1Fuente: Market Share: All Software Markets, Worldwide 2011 by Colleen Graham, Joanne Correia, David Coyle, Fabrizio Biscotti, Matthew Cheung, Ruggero Contu, Yanna Dharmasthira, Tom Eid, Chad Eschinger, Bianca Granetto, Hai Hong Swinehart, Sharon Mertz, Chris Pang, Asheesh Raina, Dan Sommer, Bhavish Sood, Marianne D'Aquila, Laurie Wurster and Jie Zhang. - March 29, 2012 2Big Data: Información recopilada desde fuentes no tradicionales como blogs, redes sociales, email, sensores, fotografías, grabaciones en video, etc. que normalmente se encuentran de forma no estructurada y en un gran volumen

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• MSCC: Scripting - Administrator's­ toolbox of magic...

  Finally, we made it to have our April meetup - in May. The most obvious explanation is the increased amount of open source and IT activities that either the MSCC, the Linux User Group of Mauritius (LUGM), or the University of Mauritius Student's Computer Club is organising. It's absolutely incredible to see the recent hype of events here on the island. And I'm loving it! Unfortunately, we also had to deal with arranging for a location this time. It was kind of an odyssey as my requests (and phone calls) haven't been answered, even though I tried it several times - well, kind of disappointing and I have to look into that for future gatherings. In my opinion, it is essential that two parameters of a community meeting are fixed as early as possible: Location, and Date and time You can't just change one or both on the very last minute. Well, this time we had to do it due to unforeseen reasons, and I apologise to any MSCC member which couldn't make it to our April meetup. Okay, lesson learned but now back to the actual meetup report ... Shortly after the meeting I placed the following statement as my first impression: "Spontaneous and improvised :) No, seriously, Ish and Dan had well prepared presentations on shell scripting, mainly focused towards Bourne Again Shell (bash), and the pros and cons of scripting versus actually writing something in a decent programming language. I thought that I could cut myself out of the equation but the demand for information about PowerShell was higher than expected..." Well, it turned out that the interest in Windows PowerShell was high, as I even got a couple of questions on it via social media networks during the evening. I also like to mention that the number of attendees went back to what I would call a "standard" number of participation. This time there were 12 craftsmen, but again a good number of First Timers. Reactions of other attendees Here are some impressions and feedback from our participants: "Enjoyed the bash and powershell (linux / windows) presentations ..." -- Nadim on event comments "He [Daniel] also showed us some syntax loopholes in Bash that could leave someone with bad code." -- Ish on MSCC – Let's talk about Scripting   Glad to see a couple of first time attendees, especially students from the university itself. Some details on the presentations MSCC: First time visit at the University of Mauritius - Phase II Engineering Tower, room 2.9 Gimme some love ... bash and other shells Ish gave a great introduction into shell scripting as he spoke about existing shell environments and a little bit about their history. Furthermore, he talked about various built-in commands, the use of coreutils, the ability to daisy-chain multiple commands using pipes, the importance of the standard I/O streams and their file descriptors in advanced scripting techniques. Combined with a couple of sample statements in the Linux terminal on Ubuntu 14.04 machine it was a solid presentation. Have a closer look at his slides - published on his blog on MSCC – Let's talk about Scripting. Oddities of scripting After the brief introduction into bash it was Daniel's turn to highlight a good number of oddities when working with shell scripts. First of all, it should be clear that scripting is not supposed for any kind of implementations in terms of software but simply to automate administrative procedures and to simplify routine jobs on a system. One of the cool oddities that he mentioned is that everything (!) in a shell is represented by strings; there are no other types like integer, float, date-time, etc. that you'd like to use in a full-fledged programming language. Let's have a look at his sample:  more to come... What's the output? As a conclusion, Daniel suggests that shell scripting should be limited but not restricted to automatic repetitive command stacks and batch jobs, startup wrapper for applications in order to set up the execution environment, and other not too sophisticated jobs. But as soon as it might involve a little bit more logic or you might rely on performance it's better to write an application in Ruby, Python, or Perl (among others of course). This is also enables the possibility to test your code properly. MSCC: Ish talking about Bourne Again Shell (bash) and shell scripting to automate regular tasks MSCC: Daniel gives an overview about the pros and cons of shell scripting versus programming MSCC: PowerShell as your scripting solution on Windows operating systems The path of the Enlightened is long ... and tough. Honestly, even though PowerShell was mentioned without any further details on the meetup's agenda, I didn't expect that there would be demand to give a presentation on Microsoft PowerShell after all. I already took this topic out of the announcement but the audience wanted to have some information. Okay, then let's see what I could do - improvised style. While my machine booted and got hooked up to the projector, I started to talk about the beginnings of PowerShell from back in 2006, and its predecessors MS DOS and Command Prompt. A throwback in history... always good for young people. As usual, Microsoft didn't get it at that time. Instead of listening to their client's needs and demands they ignored the feasibility to administrate Windows server farms without any UI tools. PowerShell is actually a result of this, and seeing that shell scripting is a common, reliable and fast way in an administrator's toolbox for decades, Microsoft had to adapt from their Microsoft Management Console (MMC) to a broader approach. It's not like shell scripting was something new; it is in daily use by alternative operating systems like AIX, HP UX, Solaris, and last but not least Linux. Most interestingly, Microsoft is very good at renovating existing architectures, and over the years PowerShell not only replaced their own combination of Command Prompt and Scripting Hosts (VBScript and CScript) but really turned into a challenging competitor on the market. The shell is easy to extend with cmdlets, and open to other Microsoft products like SQL Server, SharePoint, as well as Third-party software applications. Similar to MMC PowerShell also offers the ability to administer other machine remotely - only without a graphical user interface and therefore it's easier to automate and schedule regular tasks. Following is a sample of a PowerShell script file (extension .ps1): $strComputer = "." $colItems = get-wmiobject -class Win32_BIOS -namespace root\CIMV2 -comp $strComputer foreach ($objItem in $colItems) {write-host "BIOS Characteristics: " $objItem.BiosCharacteristicswrite-host "BIOS Version: " $objItem.BIOSVersionwrite-host "Build Number: " $objItem.BuildNumberwrite-host "Caption: " $objItem.Captionwrite-host "Code Set: " $objItem.CodeSetwrite-host "Current Language: " $objItem.CurrentLanguagewrite-host "Description: " $objItem.Descriptionwrite-host "Identification Code: " $objItem.IdentificationCodewrite-host "Installable Languages: " $objItem.InstallableLanguageswrite-host "Installation Date: " $objItem.InstallDatewrite-host "Language Edition: " $objItem.LanguageEditionwrite-host "List Of Languages: " $objItem.ListOfLanguageswrite-host "Manufacturer: " $objItem.Manufacturerwrite-host "Name: " $objItem.Namewrite-host "Other Target Operating System: " $objItem.OtherTargetOSwrite-host "Primary BIOS: " $objItem.PrimaryBIOSwrite-host "Release Date: " $objItem.ReleaseDatewrite-host "Serial Number: " $objItem.SerialNumberwrite-host "SMBIOS BIOS Version: " $objItem.SMBIOSBIOSVersionwrite-host "SMBIOS Major Version: " $objItem.SMBIOSMajorVersionwrite-host "SMBIOS Minor Version: " $objItem.SMBIOSMinorVersionwrite-host "SMBIOS Present: " $objItem.SMBIOSPresentwrite-host "Software Element ID: " $objItem.SoftwareElementIDwrite-host "Software Element State: " $objItem.SoftwareElementStatewrite-host "Status: " $objItem.Statuswrite-host "Target Operating System: " $objItem.TargetOperatingSystemwrite-host "Version: " $objItem.Versionwrite-host} Which gives you information about your BIOS and Windows OS. Then change the computer name to another one on your network (NetBIOS based) and run the script again. There lots of samples and tutorials at the Microsoft Script Center, and I would advise you to pay a visit over there if you are more interested in PowerShell. The Script Center provides the download links, too. Upcoming Events What are the upcoming events here in Mauritius? So far, we have the following ones (incomplete list as usual) in chronological order: Hacking Defence (14. May 2014) WebCup Maurice (7. & 8. June 2014) Developers Conference (TBA ~ July 2014) Linuxfest 2014 (TBA ~ November 2014) Hopefully, there will be more announcements during the next couple of weeks and months. If you know about any other event, like a bootcamp, a code challenge or hackathon here in Mauritius, please drop me a note in the comment section below this article. Thanks! My resume of the day Spontaneous and improvised :) The new location at the University of Mauritius turned out very well, there is plenty of space, and it could be a good choice for future meetings. Especially, having the ability to get more and more students into our IT community sounds like a great opportunity. Later during the day, I got some promising mails from Nadim regarding future sessions at the local branch of the Middlesex University. Well, we will see in the future... But for now this will be on hold until approximately October when students resume their regular studies. Anyway, it was a good experience at the university, and thanks again to the UoM Student's Computer Club that made the necessary arrangements for the MSCC!

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• Mounting NAS share: Bad Address

  - by Korben

  I've faced to the problem that can't solve. Hope you can help me with it. I have a storage QNAP TS-459U, with it's own Linux, and 'massive1' folder shared, which I need to mount to my Debian server. They are connected by regular patch cord. Debian server has two network interfaces - eth0 and eth1. eth0 is for Internet, eth1 is for QNAP. So, I'm saying this: mount -t cifs //169.254.100.100/massive1/ /mnt/storage -o user=admin , where 169.254.100.100 is an IP of QNAP's interface. The result I get (after entering password): mount error(14): Bad address Refer to the mount.cifs(8) manual page (e.g. man mount.cifs) Tried: mount.cifs, smbmount, with '/' at the end of the network share and without it, and many other variations of that command. And always its: mount error(14): Bad address Funny thing is when I was in Data Center, I had connected my netbook to QNAP by the same scheme (with Fedora 16 on it), and it connected without any problems, I could read/write files on the QNAP's NAS share! So I'm really stuck with the Debian. I can't undrestand where's the difference with Fedora, making this error. Yeah, I've used Google. Couldn't find any useful info. Ping to the QNAP's IP is working, I can log into QNAP's Linux by ssh, telnet on 139's port is working. This is network interface configuration I use in Debian: IP: 169.254.100.1 Netmask: 255.255.0.0 The only diffence in connecting to Fedora and Debian is that in Fedora I've added gateway - 169.254.100.129, but ping to this IP is not working, so I think it's not necessary at all. P.S. ~# cat /etc/debian_version wheezy/sid ~# uname -a Linux host 2.6.32-5-openvz-amd64 #1 SMP Mon Mar 7 22:25:57 UTC 2011 x86_64 GNU/Linux ~# smbtree WORKGROUP \\HOST host server \\HOST\IPC$ IPC Service (host server) \\HOST\print$ Printer Drivers NAS \\MASSIVE1 NAS Server \\MASSIVE1\IPC$ IPC Service (NAS Server) \\MASSIVE1\massive1 \\MASSIVE1\Network Recycle Bin 1 [RAID5 Disk Volume: Drive 1 2 3 4] \\MASSIVE1\Public System default share \\MASSIVE1\Usb System default share \\MASSIVE1\Web System default share \\MASSIVE1\Recordings System default share \\MASSIVE1\Download System default share \\MASSIVE1\Multimedia System default share Please, help me with solving this strange issue. Thanks before.

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• dbus dependency with yum

  - by Hengjie

  Whenever, I try and run yum update I get the following error: [root@server ~]# yum update Loaded plugins: dellsysid, fastestmirror Loading mirror speeds from cached hostfile * base: mirror01.idc.hinet.net * extras: mirror01.idc.hinet.net * rpmforge: fr2.rpmfind.net * updates: mirror01.idc.hinet.net Excluding Packages in global exclude list Finished Setting up Update Process Resolving Dependencies --> Running transaction check ---> Package NetworkManager.x86_64 1:0.7.0-13.el5 set to be updated ---> Package NetworkManager-glib.x86_64 1:0.7.0-13.el5 set to be updated ---> Package SysVinit.x86_64 0:2.86-17.el5 set to be updated ---> Package acl.x86_64 0:2.2.39-8.el5 set to be updated ---> Package acpid.x86_64 0:1.0.4-12.el5 set to be updated ---> Package apr.x86_64 0:1.2.7-11.el5_6.5 set to be updated ---> Package aspell.x86_64 12:0.60.3-12 set to be updated ---> Package audit.x86_64 0:1.8-2.el5 set to be updated ---> Package audit-libs.x86_64 0:1.8-2.el5 set to be updated ---> Package audit-libs-python.x86_64 0:1.8-2.el5 set to be updated ---> Package authconfig.x86_64 0:5.3.21-7.el5 set to be updated ---> Package autofs.x86_64 1:5.0.1-0.rc2.163.el5 set to be updated ---> Package bash.x86_64 0:3.2-32.el5 set to be updated ---> Package bind.x86_64 30:9.3.6-20.P1.el5 set to be updated ---> Package bind-libs.x86_64 30:9.3.6-20.P1.el5 set to be updated ---> Package bind-utils.x86_64 30:9.3.6-20.P1.el5 set to be updated ---> Package binutils.x86_64 0:2.17.50.0.6-20.el5 set to be updated ---> Package centos-release.x86_64 10:5-8.el5.centos set to be updated ---> Package centos-release-notes.x86_64 0:5.8-0 set to be updated ---> Package coreutils.x86_64 0:5.97-34.el5_8.1 set to be updated ---> Package cpp.x86_64 0:4.1.2-52.el5 set to be updated ---> Package cpuspeed.x86_64 1:1.2.1-10.el5 set to be updated ---> Package crash.x86_64 0:5.1.8-1.el5.centos set to be updated ---> Package cryptsetup-luks.x86_64 0:1.0.3-8.el5 set to be updated ---> Package cups.x86_64 1:1.3.7-30.el5 set to be updated ---> Package cups-libs.x86_64 1:1.3.7-30.el5 set to be updated ---> Package curl.x86_64 0:7.15.5-15.el5 set to be updated --> Processing Dependency: dbus = 1.1.2-15.el5_6 for package: dbus-libs ---> Package dbus.x86_64 0:1.1.2-16.el5_7 set to be updated ---> Package dbus-libs.x86_64 0:1.1.2-16.el5_7 set to be updated ---> Package device-mapper.x86_64 0:1.02.67-2.el5 set to be updated ---> Package device-mapper-event.x86_64 0:1.02.67-2.el5 set to be updated ---> Package device-mapper-multipath.x86_64 0:0.4.7-48.el5_8.1 set to be updated ---> Package dhclient.x86_64 12:3.0.5-31.el5 set to be updated ---> Package dmidecode.x86_64 1:2.11-1.el5 set to be updated ---> Package dmraid.x86_64 0:1.0.0.rc13-65.el5 set to be updated ---> Package dmraid-events.x86_64 0:1.0.0.rc13-65.el5 set to be updated ---> Package dump.x86_64 0:0.4b41-6.el5 set to be updated ---> Package e2fsprogs.x86_64 0:1.39-33.el5 set to be updated ---> Package e2fsprogs-devel.x86_64 0:1.39-33.el5 set to be updated ---> Package e2fsprogs-libs.x86_64 0:1.39-33.el5 set to be updated ---> Package ecryptfs-utils.x86_64 0:75-8.el5 set to be updated ---> Package file.x86_64 0:4.17-21 set to be updated ---> Package finger.x86_64 0:0.17-33 set to be updated ---> Package firstboot-tui.x86_64 0:1.4.27.9-1.el5.centos set to be updated ---> Package freetype.x86_64 0:2.2.1-28.el5_7.2 set to be updated ---> Package freetype-devel.x86_64 0:2.2.1-28.el5_7.2 set to be updated ---> Package ftp.x86_64 0:0.17-37.el5 set to be updated ---> Package gamin.x86_64 0:0.1.7-10.el5 set to be updated ---> Package gamin-python.x86_64 0:0.1.7-10.el5 set to be updated ---> Package gawk.x86_64 0:3.1.5-15.el5 set to be updated ---> Package gcc.x86_64 0:4.1.2-52.el5 set to be updated ---> Package gcc-c++.x86_64 0:4.1.2-52.el5 set to be updated ---> Package glibc.i686 0:2.5-81.el5_8.1 set to be updated ---> Package glibc.x86_64 0:2.5-81.el5_8.1 set to be updated ---> Package glibc-common.x86_64 0:2.5-81.el5_8.1 set to be updated ---> Package glibc-devel.x86_64 0:2.5-81.el5_8.1 set to be updated ---> Package glibc-headers.x86_64 0:2.5-81.el5_8.1 set to be updated ---> Package gnutls.x86_64 0:1.4.1-7.el5_8.2 set to be updated ---> Package groff.x86_64 0:1.18.1.1-13.el5 set to be updated ---> Package gtk2.x86_64 0:2.10.4-21.el5_7.7 set to be updated ---> Package gzip.x86_64 0:1.3.5-13.el5.centos set to be updated ---> Package hmaccalc.x86_64 0:0.9.6-4.el5 set to be updated ---> Package htop.x86_64 0:1.0.1-2.el5.rf set to be updated ---> Package hwdata.noarch 0:0.213.26-1.el5 set to be updated ---> Package ifd-egate.x86_64 0:0.05-17.el5 set to be updated ---> Package initscripts.x86_64 0:8.45.42-1.el5.centos set to be updated ---> Package iproute.x86_64 0:2.6.18-13.el5 set to be updated ---> Package iptables.x86_64 0:1.3.5-9.1.el5 set to be updated ---> Package iptables-ipv6.x86_64 0:1.3.5-9.1.el5 set to be updated ---> Package iscsi-initiator-utils.x86_64 0:6.2.0.872-13.el5 set to be updated ---> Package kernel.x86_64 0:2.6.18-308.1.1.el5 set to be installed ---> Package kernel-headers.x86_64 0:2.6.18-308.1.1.el5 set to be updated ---> Package kpartx.x86_64 0:0.4.7-48.el5_8.1 set to be updated ---> Package krb5-devel.x86_64 0:1.6.1-70.el5 set to be updated ---> Package krb5-libs.x86_64 0:1.6.1-70.el5 set to be updated ---> Package krb5-workstation.x86_64 0:1.6.1-70.el5 set to be updated ---> Package ksh.x86_64 0:20100621-5.el5_8.1 set to be updated ---> Package kudzu.x86_64 0:1.2.57.1.26-3.el5.centos set to be updated ---> Package less.x86_64 0:436-9.el5 set to be updated ---> Package lftp.x86_64 0:3.7.11-7.el5 set to be updated ---> Package libX11.x86_64 0:1.0.3-11.el5_7.1 set to be updated ---> Package libX11-devel.x86_64 0:1.0.3-11.el5_7.1 set to be updated ---> Package libXcursor.x86_64 0:1.1.7-1.2 set to be updated ---> Package libacl.x86_64 0:2.2.39-8.el5 set to be updated ---> Package libgcc.x86_64 0:4.1.2-52.el5 set to be updated ---> Package libgomp.x86_64 0:4.4.6-3.el5.1 set to be updated ---> Package libpng.x86_64 2:1.2.10-16.el5_8 set to be updated ---> Package libpng-devel.x86_64 2:1.2.10-16.el5_8 set to be updated ---> Package libsmbios.x86_64 0:2.2.27-3.2.el5 set to be updated ---> Package libstdc++.x86_64 0:4.1.2-52.el5 set to be updated ---> Package libstdc++-devel.x86_64 0:4.1.2-52.el5 set to be updated ---> Package libsysfs.x86_64 0:2.1.0-1.el5 set to be updated ---> Package libusb.x86_64 0:0.1.12-6.el5 set to be updated ---> Package libvolume_id.x86_64 0:095-14.27.el5_7.1 set to be updated ---> Package libxml2.x86_64 0:2.6.26-2.1.15.el5_8.2 set to be updated ---> Package libxml2-python.x86_64 0:2.6.26-2.1.15.el5_8.2 set to be updated ---> Package logrotate.x86_64 0:3.7.4-12 set to be updated ---> Package lsof.x86_64 0:4.78-6 set to be updated ---> Package lvm2.x86_64 0:2.02.88-7.el5 set to be updated ---> Package m2crypto.x86_64 0:0.16-8.el5 set to be updated ---> Package man.x86_64 0:1.6d-2.el5 set to be updated ---> Package man-pages.noarch 0:2.39-20.el5 set to be updated ---> Package mcelog.x86_64 1:0.9pre-1.32.el5 set to be updated ---> Package mesa-libGL.x86_64 0:6.5.1-7.10.el5 set to be updated ---> Package mesa-libGL-devel.x86_64 0:6.5.1-7.10.el5 set to be updated ---> Package microcode_ctl.x86_64 2:1.17-1.56.el5 set to be updated ---> Package mkinitrd.x86_64 0:5.1.19.6-75.el5 set to be updated ---> Package mktemp.x86_64 3:1.5-24.el5 set to be updated --> Processing Dependency: nash = 5.1.19.6-68.el5_6.1 for package: mkinitrd ---> Package nash.x86_64 0:5.1.19.6-75.el5 set to be updated ---> Package net-snmp.x86_64 1:5.3.2.2-17.el5 set to be updated ---> Package net-snmp-devel.x86_64 1:5.3.2.2-17.el5 set to be updated ---> Package net-snmp-libs.x86_64 1:5.3.2.2-17.el5 set to be updated ---> Package net-snmp-utils.x86_64 1:5.3.2.2-17.el5 set to be updated ---> Package net-tools.x86_64 0:1.60-82.el5 set to be updated ---> Package nfs-utils.x86_64 1:1.0.9-60.el5 set to be updated ---> Package nfs-utils-lib.x86_64 0:1.0.8-7.9.el5 set to be updated ---> Package nscd.x86_64 0:2.5-81.el5_8.1 set to be updated ---> Package nspr.x86_64 0:4.8.9-1.el5_8 set to be updated ---> Package nspr-devel.x86_64 0:4.8.9-1.el5_8 set to be updated ---> Package nss.x86_64 0:3.13.1-5.el5_8 set to be updated ---> Package nss-devel.x86_64 0:3.13.1-5.el5_8 set to be updated ---> Package nss-tools.x86_64 0:3.13.1-5.el5_8 set to be updated ---> Package nss_ldap.x86_64 0:253-49.el5 set to be updated ---> Package ntp.x86_64 0:4.2.2p1-15.el5.centos.1 set to be updated ---> Package numactl.x86_64 0:0.9.8-12.el5_6 set to be updated ---> Package oddjob.x86_64 0:0.27-12.el5 set to be updated ---> Package oddjob-libs.x86_64 0:0.27-12.el5 set to be updated ---> Package openldap.x86_64 0:2.3.43-25.el5 set to be updated ---> Package openssh.x86_64 0:4.3p2-82.el5 set to be updated ---> Package openssh-clients.x86_64 0:4.3p2-82.el5 set to be updated ---> Package openssh-server.x86_64 0:4.3p2-82.el5 set to be updated ---> Package openssl.i686 0:0.9.8e-22.el5_8.1 set to be updated ---> Package openssl.x86_64 0:0.9.8e-22.el5_8.1 set to be updated ---> Package openssl-devel.x86_64 0:0.9.8e-22.el5_8.1 set to be updated ---> Package pam_krb5.x86_64 0:2.2.14-22.el5 set to be updated ---> Package pam_pkcs11.x86_64 0:0.5.3-26.el5 set to be updated ---> Package pango.x86_64 0:1.14.9-8.el5.centos.3 set to be updated ---> Package parted.x86_64 0:1.8.1-29.el5 set to be updated ---> Package pciutils.x86_64 0:3.1.7-5.el5 set to be updated ---> Package perl.x86_64 4:5.8.8-38.el5 set to be updated ---> Package perl-Compress-Raw-Bzip2.x86_64 0:2.037-1.el5.rf set to be updated ---> Package perl-Compress-Raw-Zlib.x86_64 0:2.037-1.el5.rf set to be updated ---> Package perl-rrdtool.x86_64 0:1.4.7-1.el5.rf set to be updated ---> Package poppler.x86_64 0:0.5.4-19.el5 set to be updated ---> Package poppler-utils.x86_64 0:0.5.4-19.el5 set to be updated ---> Package popt.x86_64 0:1.10.2.3-28.el5_8 set to be updated ---> Package postgresql-libs.x86_64 0:8.1.23-1.el5_7.3 set to be updated ---> Package procps.x86_64 0:3.2.7-18.el5 set to be updated ---> Package proftpd.x86_64 0:1.3.4a-1.el5.rf set to be updated --> Processing Dependency: perl(Mail::Sendmail) for package: proftpd ---> Package python.x86_64 0:2.4.3-46.el5 set to be updated ---> Package python-ctypes.x86_64 0:1.0.2-3.el5 set to be updated ---> Package python-libs.x86_64 0:2.4.3-46.el5 set to be updated ---> Package python-smbios.x86_64 0:2.2.27-3.2.el5 set to be updated ---> Package rhpl.x86_64 0:0.194.1-2 set to be updated ---> Package rmt.x86_64 0:0.4b41-6.el5 set to be updated ---> Package rng-utils.x86_64 1:2.0-5.el5 set to be updated ---> Package rpm.x86_64 0:4.4.2.3-28.el5_8 set to be updated ---> Package rpm-build.x86_64 0:4.4.2.3-28.el5_8 set to be updated ---> Package rpm-devel.x86_64 0:4.4.2.3-28.el5_8 set to be updated ---> Package rpm-libs.x86_64 0:4.4.2.3-28.el5_8 set to be updated ---> Package rpm-python.x86_64 0:4.4.2.3-28.el5_8 set to be updated ---> Package rrdtool.x86_64 0:1.4.7-1.el5.rf set to be updated ---> Package rsh.x86_64 0:0.17-40.el5_7.1 set to be updated ---> Package rsync.x86_64 0:3.0.6-4.el5_7.1 set to be updated ---> Package ruby.x86_64 0:1.8.5-24.el5 set to be updated ---> Package ruby-libs.x86_64 0:1.8.5-24.el5 set to be updated ---> Package sblim-sfcb.x86_64 0:1.3.11-49.el5 set to be updated ---> Package sblim-sfcc.x86_64 0:2.2.2-49.el5 set to be updated ---> Package selinux-policy.noarch 0:2.4.6-327.el5 set to be updated ---> Package selinux-policy-targeted.noarch 0:2.4.6-327.el5 set to be updated ---> Package setup.noarch 0:2.5.58-9.el5 set to be updated ---> Package shadow-utils.x86_64 2:4.0.17-20.el5 set to be updated ---> Package smartmontools.x86_64 1:5.38-3.el5 set to be updated ---> Package smbios-utils-bin.x86_64 0:2.2.27-3.2.el5 set to be updated ---> Package smbios-utils-python.x86_64 0:2.2.27-3.2.el5 set to be updated ---> Package sos.noarch 0:1.7-9.62.el5 set to be updated ---> Package srvadmin-omilcore.x86_64 0:6.5.0-1.452.1.el5 set to be updated ---> Package strace.x86_64 0:4.5.18-11.el5_8 set to be updated ---> Package subversion.x86_64 0:1.6.11-7.el5_6.4 set to be updated ---> Package sudo.x86_64 0:1.7.2p1-13.el5 set to be updated ---> Package sysfsutils.x86_64 0:2.1.0-1.el5 set to be updated ---> Package syslinux.x86_64 0:3.11-7 set to be updated ---> Package system-config-network-tui.noarch 0:1.3.99.21-1.el5 set to be updated ---> Package talk.x86_64 0:0.17-31.el5 set to be updated ---> Package tar.x86_64 2:1.15.1-31.el5 set to be updated ---> Package traceroute.x86_64 3:2.0.1-6.el5 set to be updated ---> Package tzdata.x86_64 0:2012b-3.el5 set to be updated ---> Package udev.x86_64 0:095-14.27.el5_7.1 set to be updated ---> Package util-linux.x86_64 0:2.13-0.59.el5 set to be updated ---> Package vixie-cron.x86_64 4:4.1-81.el5 set to be updated ---> Package wget.x86_64 0:1.11.4-3.el5_8.1 set to be updated ---> Package xinetd.x86_64 2:2.3.14-16.el5 set to be updated ---> Package yp-tools.x86_64 0:2.9-2.el5 set to be updated ---> Package ypbind.x86_64 3:1.19-12.el5_6.1 set to be updated ---> Package yum.noarch 0:3.2.22-39.el5.centos set to be updated ---> Package yum-dellsysid.x86_64 0:2.2.27-3.2.el5 set to be updated ---> Package yum-fastestmirror.noarch 0:1.1.16-21.el5.centos set to be updated ---> Package zlib.x86_64 0:1.2.3-4.el5 set to be updated ---> Package zlib-devel.x86_64 0:1.2.3-4.el5 set to be updated --> Running transaction check --> Processing Dependency: dbus = 1.1.2-15.el5_6 for package: dbus-libs --> Processing Dependency: nash = 5.1.19.6-68.el5_6.1 for package: mkinitrd ---> Package perl-Mail-Sendmail.noarch 0:0.79-1.2.el5.rf set to be updated base/filelists | 3.5 MB 00:00 dell-omsa-indep/filelists | 195 kB 00:01 dell-omsa-specific/filelists | 1.0 kB 00:00 extras/filelists_db | 224 kB 00:00 rpmforge/filelists | 4.8 MB 00:06 updates/filelists_db | 715 kB 00:00 --> Finished Dependency Resolution dbus-libs-1.1.2-15.el5_6.i386 from installed has depsolving problems --> Missing Dependency: dbus = 1.1.2-15.el5_6 is needed by package dbus-libs-1.1.2-15.el5_6.i386 (installed) mkinitrd-5.1.19.6-68.el5_6.1.i386 from installed has depsolving problems --> Missing Dependency: nash = 5.1.19.6-68.el5_6.1 is needed by package mkinitrd-5.1.19.6-68.el5_6.1.i386 (installed) Error: Missing Dependency: nash = 5.1.19.6-68.el5_6.1 is needed by package mkinitrd-5.1.19.6-68.el5_6.1.i386 (installed) Error: Missing Dependency: dbus = 1.1.2-15.el5_6 is needed by package dbus-libs-1.1.2-15.el5_6.i386 (installed) You could try using --skip-broken to work around the problem You could try running: package-cleanup --problems package-cleanup --dupes rpm -Va --nofiles --nodigest The program package-cleanup is found in the yum-utils package. I have tried running package-cleanup --dupes and package-cleanup --problems but to no avail.

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• ubuntu bind9 AppArmor read permission denied (chroot jail)

  - by Richard Whitman

  I am trying to run bind9 with chroot jail. I followed the steps mentioned at : http://www.howtoforge.com/debian_bind9_master_slave_system I am getting the following errors in my syslog: Jul 27 16:53:49 conf002 named[3988]: starting BIND 9.7.3 -u bind -t /var/lib/named Jul 27 16:53:49 conf002 named[3988]: built with '--prefix=/usr' '--mandir=/usr/share/man' '--infodir=/usr/share/info' '--sysconfdir=/etc/bind' '--localstatedir=/var' '--enable-threads' '--enable-largefile' '--with-libtool' '--enable-shared' '--enable-static' '--with-openssl=/usr' '--with-gssapi=/usr' '--with-gnu-ld' '--with-dlz-postgres=no' '--with-dlz-mysql=no' '--with-dlz-bdb=yes' '--with-dlz-filesystem=yes' '--with-dlz-ldap=yes' '--with-dlz-stub=yes' '--with-geoip=/usr' '--enable-ipv6' 'CFLAGS=-fno-strict-aliasing -DDIG_SIGCHASE -O2' 'LDFLAGS=-Wl,-Bsymbolic-functions' 'CPPFLAGS=' Jul 27 16:53:49 conf002 named[3988]: adjusted limit on open files from 4096 to 1048576 Jul 27 16:53:49 conf002 named[3988]: found 4 CPUs, using 4 worker threads Jul 27 16:53:49 conf002 named[3988]: using up to 4096 sockets Jul 27 16:53:49 conf002 named[3988]: loading configuration from '/etc/bind/named.conf' Jul 27 16:53:49 conf002 named[3988]: none:0: open: /etc/bind/named.conf: permission denied Jul 27 16:53:49 conf002 named[3988]: loading configuration: permission denied Jul 27 16:53:49 conf002 named[3988]: exiting (due to fatal error) Jul 27 16:53:49 conf002 kernel: [74323.514875] type=1400 audit(1343433229.352:108): apparmor="DENIED" operation="open" parent=3987 profile="/usr/sbin/named" name="/var/lib/named/etc/bind/named.conf" pid=3992 comm="named" requested_mask="r" denied_mask="r" fsuid=103 ouid=103 Looks like the process can not read the file /var/lib/named/etc/bind/named.conf. I have made sure that the owner of this file is user bind, and it has the read/write access to it: root@test:/var/lib/named/etc/bind# ls -atl total 64 drwxr-xr-x 3 bind bind 4096 2012-07-27 16:35 .. drwxrwsrwx 2 bind bind 4096 2012-07-27 15:26 zones drwxr-sr-x 3 bind bind 4096 2012-07-26 21:36 . -rw-r--r-- 1 bind bind 666 2012-07-26 21:33 named.conf.options -rw-r--r-- 1 bind bind 514 2012-07-26 21:18 named.conf.local -rw-r----- 1 bind bind 77 2012-07-25 00:25 rndc.key -rw-r--r-- 1 bind bind 2544 2011-07-14 06:31 bind.keys -rw-r--r-- 1 bind bind 237 2011-07-14 06:31 db.0 -rw-r--r-- 1 bind bind 271 2011-07-14 06:31 db.127 -rw-r--r-- 1 bind bind 237 2011-07-14 06:31 db.255 -rw-r--r-- 1 bind bind 353 2011-07-14 06:31 db.empty -rw-r--r-- 1 bind bind 270 2011-07-14 06:31 db.local -rw-r--r-- 1 bind bind 2994 2011-07-14 06:31 db.root -rw-r--r-- 1 bind bind 463 2011-07-14 06:31 named.conf -rw-r--r-- 1 bind bind 490 2011-07-14 06:31 named.conf.default-zones -rw-r--r-- 1 bind bind 1317 2011-07-14 06:31 zones.rfc1918 What could be wrong here?

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• passwd ldap request to ActiveDirectory fails on half of 2500 users

  - by groovehunter

  We just setup ActiveDirectory in my company and imported all linux users and groups. On the linux client: (configured to ask ldap in nsswitch.conf): If i do a common ldapsearch to the AD ldap server i get the complete number of about 2580 users. But if i do this it only gets a part of all users, 1221 in number: getent passwd | wc -l Running it with strace shows kind of attempt to reconnect My ideas were: Does the linux authentication procedure run ldapsearch with a parameter incompatible to AD ldap ? Or probably it is a encoding issue. The windows user are entered in AD with all kind of characters. Maybe someone could shed light on this and give a hint how to debug that further!? Here's our ldap.conf host audc01.mycompany.de audc03.mycompany.de base ou=location,dc=mycompany,dc=de ldap_version 3 binddn cn=manager,ou=location,dc=mycompany,dc=de bindpw Password timelimit 120 idle_timelimit 3600 nss_base_passwd cn=users,cn=import,ou=location,dc=mycompany,dc=de?sub nss_base_group ou=location,dc=mycompany,dc=de?sub # RFC 2307 (AD) mappings nss_map_objectclass posixAccount User # nss_map_objectclass shadowAccount User nss_map_objectclass posixGroup Group nss_map_attribute uid sAMAccountName nss_map_attribute cn sAMAccountName # Display Name nss_map_attribute gecos cn ## nss_map_attribute homeDirectory unixHomeDirectory nss_map_attribute loginShell msSFU30LoginShell # PAM attributes pam_login_attribute sAMAccountName # Location based login pam_groupdn CN=Location-AU-Login,OU=au,OU=Location,DC=mycompany,DC=de pam_member_attribute msSFU30PosixMember ## pam_lookup_policy yes pam_filter objectclass=User nss_initgroups_ignoreusers avahi,avahi-autoipd,backup,bin,couchdb,daemon,games,gdm,gnats,haldaemon,hplip,irc,kernoops,libuuid,list,lp,mail,man,messagebus,news,proxy,pulse,root,rtkit,saned,speech-dispatcher,statd,sync,sys,syslog,usbmux,uucp,www-data and here the stacktrace from strace getent passwd poll([{fd=4, events=POLLIN|POLLPRI|POLLERR|POLLHUP}], 1, 120000) = 1 ([{fd=4, revents=POLLIN}]) read(4, "0\204\0\0\0A\2\1", 8) = 8 read(4, "\4e\204\0\0\0\7\n\1\0\4\0\4\0\240\204\0\0\0+0\204\0\0\0%\4\0261.2."..., 63) = 63 stat64("/etc/ldap.conf", {st_mode=S_IFREG|0644, st_size=1151, ...}) = 0 geteuid32() = 12560 getsockname(4, {sa_family=AF_INET, sin_port=htons(60334), sin_addr=inet_addr("10.1.35.51")}, [16]) = 0 getpeername(4, {sa_family=AF_INET, sin_port=htons(389), sin_addr=inet_addr("10.1.5.81")}, [16]) = 0 time(NULL) = 1297684722 rt_sigaction(SIGPIPE, {SIG_DFL, [], 0}, NULL, 8) = 0 munmap(0xb7617000, 1721) = 0 close(3) = 0 rt_sigaction(SIGPIPE, {SIG_IGN, [], 0}, {SIG_DFL, [], 0}, 8) = 0 rt_sigaction(SIGPIPE, {SIG_DFL, [], 0}, NULL, 8) = 0 rt_sigaction(SIGPIPE, {SIG_IGN, [], 0}, {SIG_DFL, [], 0}, 8) = 0 write(4, "0\5\2\1\5B\0", 7) = 7 shutdown(4, 2 /* send and receive */) = 0 close(4) = 0 shutdown(-1, 2 /* send and receive */) = -1 EBADF (Bad file descriptor) close(-1) = -1 EBADF (Bad file descriptor) exit_group(0) = ?

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• tproxy squid bridge very slow when cache is full

  - by Roberto

  I have installed a bridge tproxy proxy in a fast server with 8GB ram. The traffic is around 60Mb/s. When I start for first time the proxy (with the cache empty) the proxy works very well but when the cache becomes full (few hours later) the bridge goes very slow, the traffic goes below 10Mb/s and the proxy server becomes unusable. Any hints of what may be happening? I'm using: linux-2.6.30.10 iptables-1.4.3.2 squid-3.1.1 compiled with these options: ./configure --prefix=/usr --mandir=/usr/share/man --infodir=/usr/share/info --datadir=/usr/share --localstatedir=/var/lib --sysconfdir=/etc/squid --libexecdir=/usr/libexec/squid --localstatedir=/var --datadir=/usr/share/squid --enable-removal-policies=lru,heap --enable-icmp --disable-ident-lookups --enable-cache-digests --enable-delay-pools --enable-arp-acl --with-pthreads --with-large-files --enable-htcp --enable-carp --enable-follow-x-forwarded-for --enable-snmp --enable-ssl --enable-async-io=32 --enable-linux-netfilter --enable-epoll --disable-poll --with-maxfd=16384 --enable-err-languages=Spanish --enable-default-err-language=Spanish My squid.conf: cache_mem 100 MB memory_pools off acl manager proto cache_object acl localhost src 127.0.0.1/32 acl localhost src ::1/128 acl to_localhost dst 127.0.0.0/8 0.0.0.0/32 acl to_localhost dst ::1/128 acl localnet src 10.0.0.0/8 # RFC1918 possible internal network acl localnet src 172.16.0.0/12 # RFC1918 possible internal network acl localnet src 192.168.0.0/16 # RFC1918 possible internal network acl localnet src fc00::/7 # RFC 4193 local private network range acl localnet src fe80::/10 # RFC 4291 link-local (directly plugged) machines acl net-g1 src xxx.xxx.xxx.xxx/24 acl SSL_ports port 443 acl Safe_ports port 80 # http acl Safe_ports port 21 # ftp acl Safe_ports port 443 # https acl Safe_ports port 70 # gopher acl Safe_ports port 210 # wais acl Safe_ports port 1025-65535 # unregistered ports acl Safe_ports port 280 # http-mgmt acl Safe_ports port 488 # gss-http acl Safe_ports port 591 # filemaker acl Safe_ports port 777 # multiling http acl CONNECT method CONNECT http_access allow manager localhost http_access deny manager http_access deny !Safe_ports http_access deny CONNECT !SSL_ports http_access allow net-g1 from where browsing should be allowed http_access allow localnet http_access allow localhost http_access deny all http_port 3128 http_port 3129 tproxy hierarchy_stoplist cgi-bin ? cache_dir ufs /var/spool/squid 8000 16 256 access_log none cache_log /var/log/squid/cache.log coredump_dir /var/spool/squid refresh_pattern ^ftp: 1440 20% 10080 refresh_pattern ^gopher: 1440 0% 1440 refresh_pattern -i (/cgi-bin/|\?) 0 0% 0 refresh_pattern . I have this issue when the cache is full, but do not really know if it is because of that. Thanks in advance and sorry my english. roberto

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• How to create a Windows 7 installation usb media from linux ? (to install Windows 7) - Help need to know better method

  - by Abel Coto

  I have been reading some web pages and posts here and in other forums about how to create a Windows 7 installation Usb media (to install windows 7 using a usb) from linux. I asked in technet about this , and they give me general ideas about how to do it I personally am not very familiar with linux, but basicaly all that you need to do... in whatever way you do it is the following: Format a usb flash drive, either fat32 or ntfs create a partition that is large enough to host the windows installation (give or take 3GB for 64bit, aroudn 2.5gb for 32bit) and mark that partition as active/bootable. Since this can be done with windows, but just as well with a tool like gparted, you should be able to do the same in debian. Once you have created that partition, mount the iso that you download, and copy all files starting from the root, into the root of the usb flash drive. That's all there's to it. There is a method that i found in various places,that is almost the same that the man of technet has said. But,there is a step,that in that method is done,that i don't know if it is really necessary,or not. Not allways dd works.Basically, the missing step was to write a proper boot sector to the usb stick, which can be done from linux with ms-sys. This works with the Win7 retail version. Here is the complete rundown again: Install ms-sys Check what device your usb media is asigned - here we will assume it is /dev/sdb. Delete all partitions, create a new one taking up all the space, set type to NTFS, and set it bootable: *# cfdisk /dev/sdb* Create NTFS filesystem: *# mkfs.ntfs -f /dev/sdb1* Mount iso and usb media: *# mount -o loop win7.iso /mnt/iso # mount /dev/sdb1 /mnt/usb* Copy over all files: *# cp -r /mnt/iso/* /mnt/usb/* Write Windows 7 MBR on usb stick: *# ms-sys -7 /dev/sdb* ...and you're done. Shouldn't the usb work without doing the last step "# ms-sys -7 /dev/sdb" or to make the usb bootable , is a must , not only to mark the partition as bootable ? Would be better use rsync instead of cp -r ? All this steps should be done as root, i suppose , or if not , chmod to 664 and chown the directories where are mounted the usb and the iso, no ? But i suppose that the easier thing is to copy the data as root , and that this will not affect to the data. Has anyone tried this method or some similar like copying the iso with dd ?

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• autocomplete not working on one sever, works on others

  - by dogmatic69

  I have Ubuntu 10.10 x64 and x86 running on various servers and auto complete works on all of them bar one. The issue: apt-<tab> would show a list of options but sudo apt-<tab> would not. After fiddling with it for a few hours i've found that /etc/bash_autocomplete did not exist. on the broken server. Copying the one from a working one it now works. but still not properly. sudo apt-get ins<tab> does not show do anything. listing the files in /etc/bash_autocomplete.d/ on the working server has about 50 files, and the broken one only two or three. i dont think that i can just copy these files though as it might show commands for things that are not even installed. TL;DR autocomplete broken, how can i fix it. Seems like its disabled somewhere, why is this EDIT: Ok, it was not ever installed... $ sudo apt-get install bash-completion Reading package lists... Done Building dependency tree Reading state information... Done The following NEW packages will be installed bash-completion 0 upgraded, 1 newly installed, 0 to remove and 3 not upgraded. Need to get 140kB of archives. After this operation, 1,061kB of additional disk space will be used. Get:1 http://archive.ubuntu.com/ubuntu/ maverick-updates/main bash-completion all 1:1.2-2ubuntu1.1 [140kB] Fetched 140kB in 0s (174kB/s) Selecting previously deselected package bash-completion. (Reading database ... 23808 files and directories currently installed.) Unpacking bash-completion (from .../bash-completion_1%3a1.2-2ubuntu1.1_all.deb) ... Processing triggers for man-db ... Setting up bash-completion (1:1.2-2ubuntu1.1) ... its now kinda working, but still wonky... apt-get ins<tab> gives sudo apt-get insserv as the option. also apt-get install php5<tab> gives apt-get install php5/ not php5-* options.

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• dnsmasq acts as the DHCP server for selected nodes overriding the existing DHCP server on the same LAN?

  - by user183394

  I am trying to set up a small "lab" at home. Like many modern homes, I have a regular DSL service which comes with a 2Wire 3600HGV router, which acts also as a DHCP server. Since I would like to PXE boot a few computers in my "lab" The 2Wire is inflexible to adjustments that I want to do I have used dnsmasq at work so I would like to use dnsmasq as the DHCP server for the few nodes in my "lab" if feasible. In the dnsmasq man page, there is the following: [...] -K, --dhcp-authoritative (IPv4 only) Should be set when dnsmasq is definitely the only DHCP server on a network. It changes the behaviour from strict RFC compliance so that DHCP requests on unknown leases from unknown hosts are not ignored. This allows new hosts to get a lease without a tedious timeout under all circumstances. It also allows dnsmasq to rebuild its lease database without each client needing to reacquire a lease, if the database is lost. [...] As far as I know, the ISC DHCP server can use the following to do what I would like to accomplish: authoritative; [...] subnet 192.168.1.0 netmask 255.255.255.0 { host nb0 { # only give DHCP information to this computer: hardware ethernet e8:9a:8f:17:70:42; fixed-address 192.168.1.10; option subnet-mask 255.255.255.0; option routers 192.168.1.254; option domain-name-servers 192.168.1.254; # Non-essential DHCP options filename "/pxelinux.0"; } [...] But I much prefer dnsmasq's "all-in-one-ness". My question: do I have to couple the -K option with something else? As shown in the example above, the ISC DHCP server requires the mac addresses of managed nodes to be explicitly specified. Does dnsmasq have something similar? FYI, the machine on which I plan to run dnsmasq runs CentOS 6.3 64bit. It has a statically assigned IP address: 192.168.1.3.

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