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• SQL Server 2008 R2 100% availability

  - by Mark Henderson

  Is there any way to provide 100% uptime on SQL Server 2008 R2? From my experience, the downtimes for the different replication methods are: Log Shipping: Lots (for DR only) Mirroring w. NLB: ~ 45 seconds Clustering: ~ 5-15 seconds And all of these solutions involve all of the connections being dropped from the source, so if the downtime is too long or the app's gateway doesn't support reconnection in the middle of task, then you're out of luck. The only way I can think to get around this is to abstract the clustering a level (by virtualising and then enabling VMWare FT. Yuck. Good luck getting this to work on a quad-socket, 32-core system anyway.). Is there any other way of providing 100% uptime of SQL Server?

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• knife server create- finding lists of flavors

  - by JohnMetta

  I'm new to Chef and I think I'm missing something in reading the docs. I want to create servers using knife server create (options) but can't seem to find fully complete documentation on the options. Specifically, how do I find a mapping of server flavors to whatever knife is looking for? Given the official wiki entry for "Launch Cloud Instances with Knife," the following is an example server creation on Rackspace: knife rackspace server create 'role[webserver]' --server-name server01 --image 49 --flavor 2 Likewise, on the Knife Man Page, there are commands for EC2 server images (using --d --distro DISTRO) and for Slicehost servers (using -f --flavor FLAVOR) However, what none of the documentation I've found describes is how to translate what I want to build on Rackspace ("I want Ubuntu 10.04 LTS") to what the integer entry that knife is seeking. It strikes me that, given the lack of a description in the documentation for how to find the flavor, this should be obvious. Thus, I think I'm missing something.

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• Linux bash: when to use egrep instead of grep?

  - by Michael Mao

  Hi all : I am preparing for a Linux terminal assessment now, I tried to Google and found most resources are referring to the basic "grep" rather than the more powerful "egrep" -- well, that is at least what the professor said in lecture. I am always working with small samples so performance tuning is a thing too far away. So basically I'd like to know are there any areas where I must switch to egrep to do it in a better way? Is it safe to work with basic "grep" as for now? will there be potential risks? Sorry about my limited knowledge on Linux shell commands, the man page looks like a maze to me and honestly I haven't put much time in understanding all the features both command provide.

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• How do I fake 2 discrete monitors using a DualHead2Go?

  - by Sietse

  I just got a [Matrox Dualhead2Go|http://www.matrox.com/graphics/en/products/gxm/dh2go/] for use with my MacBook Pro. I realise that the reason it works is that it fakes 1 big (wide) monitor. I also kind of depended on the software that came with it to trick OSX into accepting it as 2 monitors. Turns out the support is kind of lame: it just adds shortcuts for maximizing the window to whatever screen you want. And it even gets that wrong, since my dock doesn't auto-hide, but it doesn't take it in account while resizing, causing my window do end up "behind" my dock. (I've made a AppleScript that does the resize correctly, that I'll post below). There's two glaring issues this causes: Full screen (video, etc.) takes up both monitors, and dialogs just pops up in the middle. Is there a way to trick OSX, or at least a way to fix these issues?

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• How to secure Firefox traffic (+DNS) through SOCKS proxy under Ubuntu 10.04?

  - by Maarx

  I'm using Ubuntu 10.04, and starting a SOCKS proxy with 'ssh -D', and setting Ubuntu to use it with "System - Preferences - Network Proxy". Firefox uses the proxy, and the proxy's IP appears when I visit a site like http://www.whatismyip.com/. My question is, is Firefox resolving DNS requests through this proxy? Is my web-browsing truly secure? (That is, until I exit the other end of the proxy. I know it's insecure after that.) (And I've verified the keys, I'm not being man-in-the-middled) (And--screw it. You know what I mean. Is it resolving DNS requests through the proxy?) I don't know how I would go about verifying such a thing for myself. Using additional hardware such as another debugging proxy is not an option. If Firefox isn't resolving my DNS requests through the SOCKS proxy, how do I go about fixing it?

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• Word 2007 Smart Arts - how deep can I go?

  - by Franz

  In Office Word 2007, I want to use a Smart Art to create a hierarchical diagram for an organization. I want to use the one called "simple radial" (at least that's my word-to-word translation from German - it's the one with the circle in the middle and other circles around it, attached by lines). However, it seems to only support one level of depth (at least for circles). Everything else just becomes a bulleted list inside of the circle. Is there any way to accomplish this in Word 2007? Else: are there any other free tools to do this? I also want to add some other shapes. Again: I want to accomplish a star-like structure with a total of 4 depth levels. Thanks for your responses in advance!

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• How to backup and restore everything of foobar2000?

  - by Dennis

  What is the best way to backup and restore all my everything in Foobar2000? I was once clicked on a "Reset all" button which provide somehow a stupid feature - clear all setting and playlist. The story tell that, remember to do backup when there is nothing goes wrong. (And I don't think they should put the button on the middle of all the configuration screen.) But how? Are there any script or plugins to help me to backup all settings? I cannot find a button of export or import my settings.

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• ubuntu 10.04 console resolution

  - by Ove

  I have installed Ubuntu 10.04 on my HP Pavilion dv6000 After I installed it, the text in the console (when I press ALT+F1) was small and the console had a good resolution (I think the same as my LCD, 1280x800). Also, at boot, the "Ubuntu" logo was small and centered in the middle of the screen. That was good. After that, I installed the nVidia driver via the "System-Administration-Hardware drivers" screen. After the driver was installed, the text in the console was larger and more pixelated, and also the "Ubuntu" logo was much larger and looked uglier because it was pixelated. Can anyone help me change the resolution in the console and boot screen back to what it was before I installed the nVidia driver?

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• why can't macports find make

  - by GeoffreyF67

  I am trying to run macports like thus: port install php5 When I do so, however, I get this error: Error: Unable to open port: can't read "build.cmd": Failed to locate 'make' in path: '/opt/local/bin:/opt/local/sbin:/bin:/sbin:/usr/bin:/usr/sbin' or at its MacPorts configuration time location, did you move it? So I looked at my path: declare -x PATH="/Developer/usr/bin:/opt/subversion/bin:/opt/local/bin:/opt/local/sbin:/usr/local/php5/bin:/usr/bin:/bin:/usr/sbin:/sbin:/usr/local/bin:/usr/X11/bin" and then looked to make sure make was in one of those dirs: ls -l /Developer/usr/bin/make $ lrwxr-xr-x 1 root admin 7 Aug 7 16:47 /Developer/usr/bin/make -> gnumake And typing: make produces: make: *** No targets specified and no makefile found. Stop. So I know that it's there. But macports can't find it. Any ideas? G-Man

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• xkb layouts not working (in KDE?) after upgrade from Ubuntu 9.10 to 10.04

  - by Alan

  I customised my keyboard layout in 9.10 by editing the appropriate /usr/share/X11/xkb/symbols/ file. After upgrading to 10.04 I noticed it had overwritten all my modifications, so I recovered the layout and overwrote the symbol file's base entry. Sadly KDE (and, presumably, the entire OS) seems to ignore the files altogether. The help files don't mention anything about modifying layouts anyway (and the layout switcher seems to be using setxkbmap, which uses the above path according to its man page), so I'm at a bit of a loss. Do I need to compile this into some other format somehow or how do I get it to work?

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• faster ( squid + apache httpd + apache tomcat )

  - by letronje

  We have a production setup where we have Squid in the front(caching images, js, css, etc) Apache httpd in the middle(prefork + mod_rewrite + mod_jk/AJP + mod_deflate + mod_php(few php pages)) Apache tomcat 5.5 at the end serving all the dynamic stuff. What would be the best way to reduce the overhead of having 3 servers in the request path ? Wondering if replacing httpd with a faster web server like nginx/lighttpd will help. httpd right now does the job of url rewriting(for clean urls) and talking to tomcat(via mod_jk) and compressing output(mod_deflate) and serving some low traffic php pages. What would be ideal replacement for httpd given that we need these features? Is there a way to replace (squid + apache) with a single entity that does caching well (like squid) for static stuff, rewrites url, compresses response and forwards dynamic stuff directly to tomcat ? heard abt varnish cache, wondering if it can help.

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• How to backup a remote VPS machine?

  - by morpheous

  I am considering opting for a VPS solution, with the server running Ubuntu server. I am pretty new to this, and I need to come up with a backup policy for my server data. Initial data is likely to be about 80Mb, and I expect the data to grow at approximately 5Mb to 10 Mb a day. Can anyone recommend: A backup/restore policy (best practises for a small startup) Which tools to use for backup? Another thing that is not clear to me is - where are the files backed up to normally (in the case of remote servers). If the files are backed up to the same machine (or even to another machine but with the same host), there is potentially, a single point of failure). How do people normally backup their server data, and is the probability of machine meltdown or the host company server farm "catching fire" so remote as not to be worth worrying about - especially for a small (read one man) startup like me?

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• Apt-Get "sources.list needs at least 1 source-URI" error when building dependecies for Xen

  - by Entity_Razer

  What i'm trying to do is install Xen in a test environment, now I am trying to run the: apt-get build-dep xen-3.3 command, but it keep throwing a error which literally translated from dutch (installed the debian OS in Dutch) say's: E: your sourcelist (/etc/apt/sources.list) has to contain at least 1 source-URI I've googled it but I can't seem to find a definitive solid answer on how to fix this. By default a source-URI (read man page of apt-get) states it needs to be something along the lines of deb ftp://ftp.debian.org/debian stable contrib Now I've got 2 HTTP sources (default Debian ones) up & running so far and they've been working flawlessly for the better part of a few days now. Only now its starting to act up. Anyone able to help me out ? Much obliged !

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• How to host a scalable social networking app

  - by christopher-mccann

  I am in the middle of developing a social networking application for a very select user niche which could scale to a few million users. Right now I have always hosted applications on RackSpace Cloud and I have no issues with them at all - always been a really good service and never had any downtime. My question is though does anyone think that cloud computing is not the way to host scalable web apps? Or can anyone with experience of this recommend a better solution. I have always shunned trying to run big servers from my own facilities as I think it seems silly to go to the expense of bringing in big alternative power supplies and all the other necessary precautions when other companies already do this. I looked at managed hosting services but this proved to be a bit too expensive for us at the start and the scalability of it wasnt good enough - it would take a day or two to get a new server provisioned. Therefore I ended up on a cloud platform. If anyone has any recommendations or advice it would be greatly appreciated.

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• dhcrelay running as both DHCP and DHCPv6 relay agent on CentOS 6.2

  - by Tibor

  I am trying to set up a DHCP relay agent that would relay DHCP requests for both IPv4 and IPv6. I am using CentOS 6.2 and I am using the dhcrelay from the ISC DHCP implementation. I would like to set it up as a service, but the man page for dhcrelay states: -6 Run dhcrelay as a DHCPv6 relay agent. Incompatible with the -4 option. -4 Run dhcrelay as a DHCPv4/BOOTP relay agent. This is the default mode of operation, so the argu- ment is not necessary, but may be specified for clarity. Incompatible with -6. It seems that the -6 and -4 options are incompatible. How would I still make it work for both protocols without rolling my own service wrapper for both cases?

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• What is the difference between sar -B verses sar -W

  - by Mark

  I am trying to understand why my system is running slowly. I found the sar command, but wanted to know the difference between sar -B and sar -W I read the man page, and I understand that -B gives me the paging statistics and -W gives me the swapping statistics. What I would like to understand is the following: What is the correlation between the two sets of statistics. When should I be concerned about -B and when about -W? ie, what values from each command should I be concerned with? Which statistic is more closely related to system performance Thanks

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• What is the impact of Windows 8 with UEFI on normal users?

  - by Sam

  I am a normal man-in-the-street computer user and so do not really understand what this is about, but I want to. Can someone please explain to me if: The Windows 8/UEFI secure boot thing will make it impossible to run normal/legacy applications in Windows 8 (as they will be unsigned)? It will turn Windows into an Apple-like system where only Microsoft approved applications can be run? As I say, I'm a normal user, and that is the overall impression I have from reading all the blogs, etc about it. If, on the other hand, all it does is make sure the system is booting a signed OS, how does this prevent malware (which is what at least two Microsoft blogs that I read seemed to be saying), given that most malware is not part of the boot process? The only way I can see this making sense is if it is ensuring that all OS components are signed. Is that it? Like I say, I'm a mortal, so please don't get technical on me, but rather explain how it will affect me, the user.

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• Why do I get duplicated entries in my $PATH?

  - by reprogrammer

  I'm using Ubuntu 9.10 (karmic). And, my ~/.pam_environment looks like the following. PATH DEFAULT=${PATH}:~/Adobe/Reader9/bin:~/texlive/2009/bin/x86_64-linux GIT_EDITOR DEFAULT=vim MANPATH DEFAULT=${MANPATH}:~/texlive/2009/texmf/doc/man INFOPATH DEFAULT=${INFOPATH}:~/texlive/2009/texmf/doc/info But, echo $PATH returns me duplicated entries as the following. /usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:~/apps/Adobe/Reader9/bin:~/apps/texlive/2009/bin/x86_64-linux:~/apps/Adobe/Reader9/bin:~/apps/texlive/2009/bin/x86_64-linux I've tried replacing DEFAULT by OVERRIDE in my ~/.pam_environment file. But, that didn't help. Does any one know what's wrong with my ~/.pam_environment?

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• Closing telnet connection gracefully from session mode itself without going to telnet prompt.

  - by Kumar Alok

  a normal telnet connection is like this: telnet localhost 22 Trying 127.0.0.1... Connected to localhost. Escape character is '^]'. SSH-2.0-OpenSSH_4.2 ^] telnet close Connection closed. I want to close it from telnet session itself without coming to telnet prompt by pressing. My requirement is that if i press some control character from telnet session itself like CTRL+A so it will come out of session and close it automatically. something like this: $ telnet localhost 22 Trying 127.0.0.1... Connected to localhost. Escape character is '^]'. SSH-2.0-OpenSSH_4.2 ^A Connection closed. $ I tried all the options given at the man page and tried to do some $HOME/.telnetrc file tests but couldn't achieve it, as telnetrc will execute all the commands written in it with the given host whenever a telnet to that host is done. Can anyone help me in this, like how it can be achieved.

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• customized xkb layouts not working (in KDE?) after upgrade from Ubuntu 9.10 to 10.04

  - by Alan

  I customised my keyboard layout in 9.10 by editing the appropriate /usr/share/X11/xkb/symbols/ file. After upgrading to 10.04 I noticed it had overwritten all my modifications, so I recovered the layout and overwrote the symbol file's base entry. Sadly KDE (and, presumably, the entire OS) seems to ignore the files altogether. The help files don't mention anything about modifying layouts anyway (and the layout switcher seems to be using setxkbmap, which uses the above path according to its man page), so I'm at a bit of a loss. Do I need to compile this into some other format somehow or how do I get it to work?

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• Script or Utility to convert .nab to .csv without importing double entries in Outlook.

  - by Chris

  Currently our environment is migrating from Groupwise 7 to Outlook 2003 and we have multiple users with mission critical outside contacts in their frequent contacts that will have to be imported in Outlook. Currently our only solution is to export GW contacts to a .nab, import to excel to scrub out the contacts in our own domain (to avoid double entry) and convert to .csv. This current solution will require a lot of man hours for hand holding because most of our users are not technically savvy AT ALL and are frankly too busy to do this themselves. Anyone know of any kind of tool or script to assist with this?

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• Suppress log messages about 3ware disk temperature changes on CentOS?

  - by Stefan Lasiewski

  I have a number of CentOS 5 servers which use 3ware RAID controllers. These servers are bugging my team with messages about minor temperature changes, like this: Jun 8 12:32:39 HOST smartd[1231]: Device: /dev/twa0 [3ware_disk_01], SMART Usage Attribute: 194 Temperature_Celsius changed from 119 to 118 Jun 8 12:32:39 HOST smartd[1231]: Device: /dev/twa0 [3ware_disk_03], SMART Usage Attribute: 194 Temperature_Celsius changed from 122 to 121 How can I suppress these messages? According to man smartd.conf : To disable any of the 3 reports, set the corresponding limit to 0. Trailing zero arguments may be omitted. By default, all temperature reports are disabled (´-W 0´). On my systems, smartd is reporting about temperature changes by default. I tried a manual approach. In /etc/smartd.conf, I have the following: /dev/twa0 -d 3ware,1 -a -W 0 /dev/twa0 -d 3ware,3 -a -W 0 But this still does not suppress the messages. Since these messages show up in /var/log/messages, LogWatch is sending unnecessary emails every night.

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• Can a device (WAP or switch) be configured as an 802.1x supplicant?

  - by Allan Ross

  We are looking at implementing 802.1x on a wired/wireless network. What I am looking for is a device that can act as a supplicant and once authenticated on the network, is able to pass traffic from any downstream connected device. The point of doing this would be to allow a properly pre-configured device to be provided to a client user who could then connect any device on the downstream side of the device. We will be able to manage the aggregate traffic on the device without concern for what is connected on the far side. Am I dreaming; does every device out there support this and I just don't know it or is reality fall somewhere in the middle?

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• How can I fix this configure error?

  - by balor123

  I'm trying to build mosh from source on a SUSE10 machine and am getting the following error: checking for protobuf... no configure: error: Package requirements (protobuf) were not met: No package 'protobuf' found Consider adjusting the PKG_CONFIG_PATH environment variable if you installed software in a non-standard prefix. Alternatively, you may set the environment variables protobuf_CFLAGS and protobuf_LIBS to avoid the need to call pkg-config. See the pkg-config man page for more details. I downloaded the source to protobuf and installed it in a custom path as well. I'm not using a package manager for any of this and cannot for various reasons outside the scope of the question. I added that custom path to my PATH and rehashed. Typically, this is enough for configure but in this case its not doing the trick. I added the prefix for protobuf to PKG_CONFIG_PATH but am still hitting this error. What should I do next to get past this error?

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• Lossless cutting of MPEG TS files in Windows

  - by Sebastian P.R. Gingter

  I have several HD video files in transport stream (.ts) format, recorded with my satellite receiver. I want to cut them, as in simply remove a few minutes from the beginning, the end and sometimes a few minutes in the middle of it (remove early start of recordings, late ends and, for some seldom files, the ads). What is a good, ideally but not necessarily free, software with a GUI to do this? Best would be something where you could select points on a timeline and simply cut the elements out. As a resulting file, just the same .ts format would be great, but I could also live with putting the video contents into another container, as long as the video is NOT re-encoded / transcoded. The files have additional audio streams and subtitles. These should be retained in the process. My OS is Windows.

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