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• Is a Tumblr blog on my site good for SEO? [duplicate]

  - by Rachael Dilks

  This question already has an answer here: SEO Benefits of adding a Tumblr feed to site 1 answer I have a Tumblr blog on my "news" page on my website so if I keep this updated regularly will this improve my SEO and should I link it to my Facebook and Twitter?

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• How is Your Business Doing?

  Times are changing marketing methods are evolving, the question is are you? A well structured marketing plan can help turn your business around.

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• How to deal with requirement changes in agile development model? [duplicate]

  - by user2137886

  This question already has an answer here: How do you deal with changing requirements? 3 answers I know that in agile requirement changes should not only be planned for but also embraced. But I still don't know agile how to handle these changes.

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• UNIX - mount: only root can do that

  - by Travesty3

  I need to allow a non-root user to mount/unmount a device. I am a total noob when it comes to UNIX, so please dumb it down for me. I've been looking all over teh interwebz to find an answer and it seems everyone is giving the same one, which is to modify /etc/fstab to include that device with the 'user' option (or 'users', tried both). Cool, well I did that and it still says "mount: only root can do that". Here are the contents of my fstab: # /etc/fstab: static file system information. # # Use 'vol_id --uuid' to print the universally unique identifier for a # device; this may be used with UUID= as a more robust way to name devices # that works even if disks are added and removed. See fstab(5). # # proc /proc proc defaults 0 0 # / was on /dev/mapper/minicc-root during installation UUID=1a69f02a-a049-4411-8c57-ff4ebd8bb933 / ext3 relatime,errors=remount-ro 0 1 # /boot was on /dev/sda5 during installation UUID=038498fe-1267-44c4-8788-e1354d71faf5 /boot ext2 relatime 0 2 # swap was on /dev/mapper/minicc-swap_1 during installation UUID=0bb583aa-84a8-43ef-98c4-c6cb25d20715 none swap sw 0 0 /dev/scd0 /media/cdrom0 udf,iso9660 user,noauto,exec,utf8 0 0 /dev/scd0 /media/floppy0 auto rw,user,noauto,exec,utf8 0 0 /dev/sdb1 /mnt/sdcard auto auto,user,rw,exec 0 0 My thumb drive partition shows up as /dev/sdb1. I'm pretty sure my fstab is set up OK, but everyone on the other posts seems to fail to mention how they actually call the 'mount' command once this entry is in the fstab file. I think this is where my problem may be. The command I use to mount the drive is: $ mount /dev/sdb1 /mnt/sdcard. /bin/mount is owned by root and is in the root group and has 4755 permissions. /bin/umount is owned by root and is in the root group and has 4755 permissions. /mnt/sdcard is owned by me and is in one of my groups and has 0755 permissions. My mount command works fine if I use sudo, but I need to be able to do this without sudo (need to be able to do it from a PHP script using shell_exec). Any suggestions? Sorry for making you read so much...just trying to get as much info in the initial post as possible to preemptively answer questions about configuration stuff. If I missed anything tho, ask away. Thanks! -Travis

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• Uninstall php and nginx or fix setup

  - by jreed121

  First off, I'm a huge linux noob - sorry... I'm trying to setup nginx with php-fpm on debian and I'm pretty sure that I've completely screwed it up. nginx seems to be running fine because I can it it from a web browser and it load the stock "Welcome to nginx!" page. I'm not so sure about php-fpm though. When I try something like # restart php-fpm I get: bash: restart: command not found First off php-fpm some how got installed as php5-fpm when I do root@server:/etc/init.d# ls, which seems to contradict every tutorial and help doc I've read (supposed to be 'php-fpm'). I can restart it with this: service php5-fpm restart And just enter the package name 'php5-fpm' I get this: root@server:~# php5-fpm [17-Nov-2012 23:15:36] NOTICE: PHP message: PHP Warning: PHP Startup: Unable to load dynamic library '/usr/lib/php5/20100525/suhosin.so' - /usr/lib/php5/20100525/suhosin.so: cannot open shared object file: No such file or directory in Unknown on line 0 [17-Nov-2012 23:15:36] ERROR: An another FPM instance seems to already listen on /var/run/php5-fpm.sock [17-Nov-2012 23:15:36] ERROR: FPM initialization failed The root for nginx is /usr/share/nginx/html, when I try to navigate to a .php file in there with my web browser, it tries to download the file instead of interpret it. I would like this folder to be in my user's home directory ie: /home/administrator/www or /home/nginx/www. I know in order to do this I need to modify nginx.conf, but I find that configuration file difficult to understand. I suppose the fact that my .php scripts aren't being handled is my bigger problem anyways. When I try to see what running on port 9000 (php-fpm default port) with lsof -i :9000 it returns nothing - I guess indicating that it isn't listening. then I head over to vim /etc/php5/fpm/php-fpm.conf and there is no where to designate a port number. So should I just uninstall everything and start from scratch? If so, how do I clean it all up? Any suggestions for a tutorial once I'm ready to try again? Should I attempt to troubleshoot this mess? If so where should I start? Sorry guys, I'm feeling pretty stupid and lost right now. I'm not sure what my next steps are in trying to resolve this issue are. I realize that this is a horrible question for this type of Q&A site, but I'd really appreciate any guidance.

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• Computer experiencing slowdowns and lockups despite low cpu useage

  - by user157145

  my setup i5-2300 nvidia gtx 550 ti 6 gigs ram 600 w ocz modular psu recently reformatted and already experiencing drastic slowdown as soon as windows comes up, including repeated lockups with multiple various programs reporting that they are not responsive, then recovering after 10-30 seconds. ive checked memory and hard drive both of which come out fine. despite my plethura of worthless antiviral software im forced to assume that my illicit downloading practices have lead me into some comp trouble that i cant seem to determine. i have used ccleaner, search and destroy and malware bytes, all of which have found nothing to indicate what is causing this massive slowdown. in addition according to my resource manager my computer is operating at a load of only 30-50 percent CPU useage and 60 ram useage but taking 5-10 seconds to load files and open folders, and repeated lockups of multiple programs, especially firefox which seems to go unresponsive every 2-3 minutes. any help would be appreciated, i used a program called OTL by old timer, but cant make any sense of the results i was given. any help or suggestions would be appreciated, thank you for taking the time to read this i have avast but it didnt even find anything when i had it do a full system scan, so im thinking its clueless(also nortons, avg, and ad-aware). i also have mse but it has yet to complete a full scan it takes so long (i left it on last night but when i woke up my computer had a problem and had to restart). my hard drive has 300 gigs out of 1tb open and i already used hd tune pro, which said my harddrive was fine and its not a ssd. also im a noob at comps and only have the hd that is currently inside the computer in addition im not sure if studdering is the issue im suffering. my problem is that during my typing of these responses firefox has gone "not responsive" at least 5 times, each for times of about 5-10 seconds. when i try to control alt delete to bring up windows task manager it took 20 seconds. essentially its that my computer goes super slow at bringing up anything, or taking any action whatsoever that opens a program or file and has repeated incidents where i cant even click on whatever im trying to do because it locks up. the confusing thing about these incidents is that its right after restarting where there are minimal programs running and the computer and memory load is light.

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• Postfix issues sending mail to addresses under domain located on server

  - by iamthewit

  I recently installed virtualmin on my nice shiny new rackspace cloud. Everything went seemlessly but I've been having some issues getting emails to send properly. The problem seems to be that the server can not send mail to email addresses where the domain is owned by my server. For example, on my server I run multiple virtual domains, lets call this one test.com. When I run the mail command from shell (mail [email protected]) I get the following back from my maillog: Oct 6 14:55:18 test postfix/pickup[8737]: DC1131612CC: uid=0 from= Oct 6 14:55:18 test postfix/cleanup[8769]: DC1131612CC: [email protected] Oct 6 14:55:18 test postfix/qmgr[8738]: DC1131612CC: [email protected], size=353, nrcpt=1 (queue active) Oct 6 14:55:18 test postfix/error[8771]: DC1131612CC: [email protected], relay=none, delay=0, delays=0/0/0/0, dsn=5.0.0, status=bounced (User unknown in virtual alias table) Oct 6 14:55:18 test postfix/cleanup[8769]: DD07D1612D1: [email protected] Oct 6 14:55:18 test postfix/bounce[8772]: DC1131612CC: sender non-delivery notification: DD07D1612D1 Oct 6 14:55:18 test postfix/qmgr[8738]: DD07D1612D1: from=<, size=2268, nrcpt=1 (queue active) Oct 6 14:55:18 test postfix/qmgr[8738]: DC1131612CC: removed Oct 6 14:55:18 test postfix/local[8773]: DD07D1612D1: [email protected], relay=local, delay=0.03, delays=0/0/0/0.03, dsn=2.0.0, status=sent (delivered to command: /usr/bin/procmail-wrapper -o -a $DOMAIN -d $LOGNAME) Oct 6 14:55:18 test postfix/qmgr[8738]: DD07D1612D1: removed when I run mail [email protected] the message is sent and received perfectly fine. I'm a bit of a noob when it comes to servers, but I pick things up fairly quickly, so please excuse any incorrect terminology and my general noobiness. Any help would be greatly appreciated, I've been googling for quite a while but I haven't found a solution yet, I'll add a copy of my main.cf file in a response below cheers guys here is the reformatted postconf, do you want the reformatted main.cf file too, or is this enough? alias_database = hash:/etc/postfix/aliases alias_maps = hash:/etc/postfix/aliases broken_sasl_auth_clients = yes command_directory = /usr/sbin config_directory = /etc/postfix daemon_directory = /usr/libexec/postfix debug_peer_level = 2 home_mailbox = Maildir/ html_directory = no mailbox_command = /usr/bin/procmail-wrapper -o -a $DOMAIN -d $LOGNAME mailq_path = /usr/bin/mailq.postfix manpage_directory = /usr/share/man myhostname = server.test.com newaliases_path = /usr/bin/newaliases.postfix readme_directory = /usr/share/doc/postfix-2.3.3/README_FILES sample_directory = /usr/share/doc/postfix-2.3.3/samples sender_bcc_maps = hash:/etc/postfix/bcc sendmail_path = /usr/sbin/sendmail.postfix setgid_group = postdrop smtpd_recipient_restrictions = permit_mynetworks permit_sasl_authenticated reject_unauth_destination smtpd_sasl_auth_enable = yes smtpd_sasl_security_options = noanonymous unknown_local_recipient_reject_code = 550 virtual_alias_maps = hash:/etc/postfix/virtual

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• Which hardware to VM ratio for Build-Server virtualization?

  - by Martin

  Let's start with saying that I'm a total noob wrt. to server virtualization. That is, I use VMs often during development, but they're simple desktop machine things for me. Now to my problem: We have two (physical) build servers, one master, one slave running Jenkins to do daily tasks and build (Visual C++ Builds) our release packages for our software. As such these machines are critical to our company, because we do lot's releases and without a controlled environment to create them, we can't ship fixes. (And currently there's no proper backup of these machines in place, because they do not hold any data as such - it just would be a major pain to setup them again should they go bust. (But setting up backup that I'd know would work in case of HW failure would even be more pain, so we have skipped that until now.)) Therefore (and for scaling purposes) we would like to go virtual with these machines. Outsourcing to the cloud is not an option, not at all, so we'll have to use on-premises hardware and VM hosts. Each Build-Server (master or slave) is a fully configured (installs, licenses, shares in case of the master, ...) Windows Server box. I would now ideally like to just convert the (two) existing physical nodes to VM images and run them. Later add more VM slave instances as clones of the existing ones. And here begin my questions: Should I go for one VM per one hardware-box or should I go for something where a single hardware runs multiple VMs? That would mean a single point of failure hardware wise and doesn't seem like a good idea ... or?? Since we're doing C++ compilation with Visual Studio, I assume that during a build the hardware (processor cores + disk) will be fully utilized, so going with more than one build-node per hardware doesn't seem to make much sense?? Wrt. to hardware options, does it make any difference which VM software we use (VMWare, MS, Virtualbox, ... ?) (We're using Windows exclusively for our builds.) Regarding budget: We have a normal small company (20 developers) budget for this. ;-) That is, if it's going to cost a few k$ it's going to cost. If it's free - the better. I strongly prefer solutions where there's no multi-k$ maintenance costs per year.

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• Excel 2010: dynamic update of drop down list based upon datasource validation worksheet changes

  - by hornetbzz

  I have one worksheet for setting up the data sources of multiple data validation lists. in other words, I'm using this worksheet to provide drop down lists to multiple other worksheets. I need to dynamically update all worksheets upon any of a single or several changes on the data source worksheet. I may understand this should come with event macro over the entire workbook. My question is how to achieve this keeping the "OFFSET" formula across the whole workbook ? Thx To support my question, I put the piece of code that I'm trying to get it working : Provided the following informations : I'm using such a formula for a pseudo dynamic update of the drop down lists, for example : =OFFSET(MyDataSourceSheet!$O$2;0;0;COUNTA(MyDataSourceSheet!O:O)-1) I looked into the pearson book event chapter but I'm too noob for this. I understand this macro and implemented it successfully as a test with the drop down list on the same worksheet as the data source. My point is that I don't know how to deploy this over a complete workbook. Macro related to the datasource worksheet : Option Explicit Private Sub Worksheet_Change(ByVal Target As Range) ' Macro to update all worksheets with drop down list referenced upon ' this data source worksheet, base on ref names Dim cell As Range Dim isect As Range Dim vOldValue As Variant, vNewValue As Variant Dim dvLists(1 To 6) As String 'data validation area Dim OneValidationListName As Variant dvLists(1) = "mylist1" dvLists(2) = "mylist2" dvLists(3) = "mylist3" dvLists(4) = "mylist4" dvLists(5) = "mylist5" dvLists(6) = "mylist6" On Error GoTo errorHandler For Each OneValidationListName In dvLists 'Set isect = Application.Intersect(Target, ThisWorkbook.Names("STEP").RefersToRange) Set isect = Application.Intersect(Target, ThisWorkbook.Names(OneValidationListName).RefersToRange) ' If a change occured in the source data sheet If Not isect Is Nothing Then ' Prevent infinite loops Application.EnableEvents = False ' Get previous value of this cell With Target vNewValue = .Value Application.Undo vOldValue = .Value .Value = vNewValue End With ' LOCAL dropdown lists : For every cell with validation For Each cell In Me.UsedRange.SpecialCells(xlCellTypeAllValidation) With cell ' If it has list validation AND the validation formula matches AND the value is the old value If .Validation.Type = 3 And .Validation.Formula1 = "=" & OneValidationListName And .Value = vOldValue Then ' Debug ' MsgBox "Address: " & Target.Address ' Change the cell value cell.Value = vNewValue End If End With Next cell ' Call to other worksheets update macros Call Sheets(5).UpdateDropDownList(vOldValue, vNewValue) ' GoTo NowGetOut Application.EnableEvents = True End If Next OneValidationListName NowGetOut: Application.EnableEvents = True Exit Sub errorHandler: MsgBox "Err " & Err.Number & " : " & Err.Description Resume NowGetOut End Sub Macro UpdateDropDownList related to the destination worksheet : Sub UpdateDropDownList(Optional vOldValue As Variant, Optional vNewValue As Variant) ' Debug MsgBox "Received info for update : " & vNewValue ' For every cell with validation For Each cell In Me.UsedRange.SpecialCells(xlCellTypeAllValidation) With cell ' If it has list validation AND the validation formula matches AND the value is the old value ' If .Validation.Type = 3 And .Value = vOldValue Then If .Validation.Type = 3 And .Value = vOldValue Then ' Change the cell value cell.Value = vNewValue End If End With Next cell End Sub

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• Windows CE 6.0 time setting in registry being overrided

  - by JaminSince83

  I have asked this question on stack overflow but its probably better suited here. So I have a Motorola MC3190 Mobile Barcode scanning device with Windows CE 6.0. Now I want to get the device to sync its date/time on boot up with our domain controller using a registry file that I have created. I have used this registry file below to get close to what I require. REG 1 REGEDIT4 [HKEY_LOCAL_MACHINE\Services\TIMESVC] "UserProcGroup"=dword:00000002 "Flags"=dword:00000010 "multicastperiod"=dword:36EE80 "threshold"=dword:5265C00 "recoveryrefresh"=dword:36EE80 "refresh"=dword:5265C00 "Context"=dword:0 "Autoupdate" = dword:1 "server" = "NAMEOFMYSERVER" "ServerRole" = dword:0 "Trustlocalclock" = dword:0 "Dll"="timesvc.dll" "Keep"=dword:1 "Prefix"="NTP" "Index"=dword:0 [HKEY_LOCAL_MACHINE\nls] "DefaultLCID" = dword:00000809 [HKEY_LOCAL_MACHINE\nls\overrides] "LCID" = dword:00000809 [HKEY_LOCAL_MACHINE\Time] @ = "UTC" "TimeZoneInformation"=hex:\ 00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,\ 00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00 [HKEY_LOCAL_MACHINE\Time Zones] @ = "UTC" [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Clock] "AutoDST" = dword:00000000 Now it gets the correct date and shows the time zone correctly however the time is always 5 hours behind on Eastern Standard Time, which is really annoying. I have researched heavily into this and this question has been asked before here As you will see I have copied what it suggests but it doesnt work. Something is overiding the time which I dont understand enough about to resolve. I cannot find any other setting to get it to set the time correctly. Any help would be greatly appreciated.

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• Mounting an Azure blob container in a Linux VM Role

  - by djechelon

  I previously asked a question about this topic but now I prefer to rewrite it from scratch because I was very confused back then. I currently have a Linux XS VM Role in Azure. I basically want to create a self-managed and evoluted hosting service using VMs rather than Azure's more-expensive Web Roles. I also want to take advantage of load balancing (between VM Roles) and geo-replication (of Storage Roles), making sure that the "web files" of customers are located in a defined and manageable place. One way I found to "mount" a drive in Linux VM is described here and involves mounting a VHD onto the virtual machine. From what I could learn, the VHD is reliably-stored in a storage role, and is exclusively locked by the VM that uses it. Once the VM Role has its drive I can format the partition to any size I want. I don't want that!! I would like each hosted site to have its own blob directory, then each replicated/load-balanced VM Role to rw mount like in NFS that blob directory to read HTML and script files. The database is obviously courtesy of Microsoft :) My question is Is it possible to actually mount a blob storage into a directory in the Linux FS? Is it possible in Windows Server 2008?

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• Firebird 2.1: gfix -online returns "database shutdown"

  - by darvids0n

  Hey all. Googling this one hasn't made a bit of difference, unfortunately, as most results specify the syntax for onlining a database after using gfix -shut -force 30 (or any other number of seconds) as gfix -online dbname, and I have run gfix -online dbname with and without login credentials for the DB in question. The message that I get is: database dbname shutdown Which is fine, except that I want to bring it online now. It's out of the question to close fbserver.exe (running on a Windows box, afaik it's Classic Server 2.1.1 but it may be Super) since we have other databases running off of that which need almost 24/7 uptime. The message from doing another gfix -shut -force or -attach or -tran is invalid shutdown mode for dbname which appears to match with the documentation of what happens if the database is already fully shut down. Ideas and input greatly appreciated, especially since at the moment time is a factor for me. Thanks! EDIT: The whole reason I shut down the DB is to clear out "active" transactions which were linked to a specific IP address, and that computer is my dev terminal (actually a virtual machine where I develop frontends for the database software) but I had no processes connecting to the database at the time. They looked like orphaned transactions to me, and they weren't in limbo afaik. Running a manual sweep didn't clear them out, deleting the rows from MON$STATEMENTS didn't work even though Firebird 2.1 supposedly supports cancelling queries that way. My last resort was to "restart" the database, hence the above issue.

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• Programmable Home Security Alarm [closed]

  - by stej

  I don't ask for recommendation! (just wanted to say that; anyway it doesn't matter now as the question is closed) I've seen some advertisements about home alarms that notifies me that something is happening in my house. None of them mentioned programmability (with real programming language like e.g C, assembler, whatever). As a programmer I'd like to have a possibility to add some behaviour, that is not part of the alarm itself. This might be: take snapshots of all cameras in a house and send it to some email send email, twitter message, skype message to some predefined account send email to a police (silly, I know) start turning the lights on and off (scary, right?) etc. (would be veeery challenging with assembler, I know; but lets suppose I can use some more high level language) I don't expect that there is a alarm system capable of this stuff, that's why I'm looking for a programmable module. Question: Is it even possible? Is it good idea (my program could crash and cause instability of the system).

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• How to compare old laptop to new laptop?

  - by Lasse V. Karlsen

  I hope this question doesn't get closed at once :) I have an old laptop, a Compaq NC4200, which is going its final laps around the track these days. Battery is dead, and everything kinda runs slow. It also has only 1GB of memory, and even though I don't know if it can take more, I probably wouldn't be able to get hold of any that matches without having to special order it. The size, however, has been ideal for my usage pattern, so I'm looking to replace it with a similarly sized laptop, at least in the same size category. However, it's been a while since I tried keeping track of CPUs, so I have a question. The old laptop has a Intel Pentium M 760 1.86GHz processor. One laptop I found online has a Intel Pentium SU4100 1.3GHz dual-core. This type of processor seems to be quite common in the price and size-range I've been looking. What kind of relative performance boost could I expect from the old one to the new one? I am not expecting a "about 7.45x speed", but some indication would be nice. For instance, dual-core tells me it might be akin to 2.6GHz, but I assume I can't simply compare 1.86GHz to 2.6GHz and expect the new one to run about 1.4x as fast, I expect more these days. Or is that unrealistic for this kind of processor? Do I need to up my price range and go for a 2+ GHz processor?

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• Windows 7 Backup not backing up custom library?

  - by James McMahon

  I have created a custom Library under Windows 7 64bit professional to handle my source code. When I tried Windows Backup and Restore for the first time I get the following error Backup encountered a problem while backing up file C:\Windows\System32\config\systemprofile\Source. Error:(The system cannot find the file specified. (0x80070002)) I've found a thread on the error on the Microsoft answers site. But it appears to be 404 (there is a version in Google's Cache) and the thread starter never gets an answer to his issue that works. The official Microsoft answer on this is This problem is due to one or more profiles under HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\WindowsNT\CurrentVersion\ProfileList with missing ProfileImagePath. To check whether you have missing profiles: Open regedit, navigate to the above registry key. (HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\ProfileList). Expand the list Click on each of the profiles listed. The first 3 profiles should have ProfileImagePath value of %SystemRoot%\System32\Config\SystemProfile, %SystemRoot%\ServiceProfiles\LocalService, and %SystemRoot%\ServiceProfiles\NetworkService respectively. Starting from the 4th profile, the ProfileImagePath should contain path to the user profiles on your machine, such as C:\users\Christine If one or more of the profile has no profile image, then you have missing profiles. To work around this, delete the profile in question (Caution: The registry contains critical settings that are necessary for your system to function properly. Take extra caution while making changes) First, export the ProfileList key for safekeeping. (Right click on the key, choose “Export”, and save it to the desktop.) Right click on the profile in question, choose delete. Try backup again. This does not work for me. Anyone have any idea what is going on here?

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• How can I forward an application with X11 in grayscale

  - by ??????? ???????????

  I am trying to run a graphical application at home and display it on a it on a laptop which is located about six routing hops away. The problem is that the connection is so slow (or rather there is so much GOOEY being transfered) that the mouse is unresponsive and it takes a "long time" to redraw the window even at a resolution of 800x600 pixels. The connection speeds are 10MBit up at home and about 1MBit down on the laptop, which I think should be sufficient for looking at some GUI in (almost) real time. Since this traffic is sent over over a secure shell, I have enabled Compression with highest CompressionLevel along with Ciphers set to blowfish-cbc. This has substantially improved the responsiveness of the application, making it nearly usable. However, my goal is to improve the performance even further by sacrificing colors and even frame rate. The application to be displayed a Qemu SDL window with a graphically-oriented OS in it. This is not strictly relevant, but perhaps there are options to tweak the SDL output which I am not aware of. A possible workaround would be to run the application in a "hidden" X server and enabling TigerVNC on that X server. This would automatically give me the benefits of an optimized VNC viewport, but the goal is to do without (reduce complexity). The question I'm asking is what are my options for reducing the data-rate generated on the server in order to make the graphical application more usable on the client. As mentioned, colors are not important and I could probably work with 5-16 fps. Both machines are running Gentoo with the software in question being: workstation X.Org X Server 1.10.4 OpenSSH_5.8p1-hpn13v10, OpenSSL 1.0.0e QEMU emulator version 0.15.1 (qemu-kvm-0.15.1) laptop X.Org X Server 1.12.2 OpenSSH_5.8p1-hpn13v10lpk, OpenSSL 1.0.0j

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• Can a CNAME be a hostname

  - by pulegium

  This is bit of a theological question, but nonetheless... So, a server has a hostname, let's say the fqdn is hostname.example.com (to be really precise about what I mean, this is the name that is set in /etc/sysconfig/network). The very same server has multiple interfaces on different subnets. Let's say the IPs are 10.0.0.1 and 10.0.1.1. Now the question is, is it theoretically (mind you, this is important, I know that practically it works, but I'm interested in purely academic answer) allowed to have the following setup: interface1.example.com. IN A 10.0.0.1 interface2.example.com. IN A 10.0.1.1 hostname.example.com. IN CNAME interface1.example.com. OR should it rather be: hostname.example.com. IN A 10.0.0.1 interface2.example.com. IN A 10.0.1.1 interface1.example.com. IN CNAME hostname.example.com. I guess it's obvious which one is making more sense from the management/administration POV, but is it technically correct? The argument against the first setup is that a reverse lookup to 10.0.0.1 returns interface1.example.com and not what one might expect (ie the hostname: hostname.example.com), so the forward request and then sub sequential reverse lookups would return different results. Now, as I said, I want a theoretical answer. Links to RFC sections etc, that explicitly allows or disallows use of CNAME name as a hostname. If there's none, that's fine too, I just need to confirm. I failed to find any explicit statements so far, bar this book, where this situation is given as an example and implies that it can be done as one of the ways to avoid MX records pointing to a CNAME.

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• APC fragmention woes on Apache AWS EC2 Small instance with WordPress and W3TC

  - by two7s_clash

  AWS EC2 Small instance, Apache 2 running WordPress and W3TC. Within an hour, my APC fragmentation hits 100%. My APC settings are: apc.enabled = 1 apc.shm_segments = 1 apc.shm_size = 100M apc.optimization = 0 apc.num_files_hint = 512 apc.user_entries_hint = 1024 apc.ttl = 7200 apc.user_ttl = 7200 apc.gc_ttl = 3600 apc.cache_by_default = 1 apc.use_request_time = 1 apc.filters = "apc\.php$" apc.mmap_file_mask = "/tmp/apc.XXXXXX" apc.slam_defense = 0 apc.file_update_protection = 2 apc.enable_cli = 0 apc.max_file_size = 2M apc.stat = 1 apc.write_lock = 1 apc.report_autofilter = 0 apc.include_once_override = 0 apc.rfc1867 = 0 apc.rfc1867_prefix = "upload_" apc.rfc1867_name = "APC_UPLOAD_PROGRESS" apc.rfc1867_freq = 0 apc.localcache = 0 apc.localcache.size = 256M apc.coredump_unmap = 0 apc.stat_ctime = 0 apc.canonicalize = 1 apc.lazy_functions = 0 apc.lazy_classes = 0 /etc/php.d/apc.ini More poop can be seen here. Mostly cribed settings from here. The shm was meant to be whittled down from such a high value after some observation, but apparently such a large value isn't even high enough.... I found an similar question/answer here. I do have some virtual hosts setup, but they aren't being touched much at all. Having users logged into the admin panel of WP does make things worse, but that's certainly not the main culprit. The question asker seems to suggest that it turns out W3TC is probably causing the problem, which the plugin author seems to agree with, but there aren't any helpful details beyond that. Why is it causing the problem? Do I just take it for now and turn off object caching with APC? Is there nothing I can do? Does having it turned on without being used for object caching actually help anything? Would memcache be an ok substitute just for object caching here? Finally, maybe I just shouldn't worry so much about the fragmentation?

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• Reverse Proxies and AJAX

  - by osij2is

  A client of ours is using IBM/Tivoli WebSEAL, a reverse-proxy server for some of their internal users. Our web application (ASP.NET 2.0) and is a fairly straightforward web/database application. Currently, our client users that are going through the WebSEAL proxy are having problems with a .NET 3rd party control. Users who are not going through the proxy have no issues. The 3rd party control is nothing more than an AJAX dynamic tree that on each click requests all the nodes for each leaf. Now our clients claim that once users click on a node in the control, the control itself freezes in such a way that they don't see anything populate. Users see "Loading..." message appear but no new activity there afterwards. They have to leave the page and go back to the original page in order to view the new nodes. I've never worked with a reverse proxy before so I have googled quite a bit on the subject even found an article on SF. IBM/Tivoli has mentioned this issue before but this is about all they mention at all. While the IBM doc is very helpful, all of our AJAX is from the 3rd party control. I've tried troubleshooting using Firebug but by not being behind the reverse proxy, I'm unable to truly replicate the problem. My question is: does anyone have experience with reverse proxies and issues with AJAX sites? How can I go about proving what the exact issue is? Currently we're negotiating remote access so assume for the greater part that I will have access to a machine that's using the WebSEAL proxy. P.S. I realize this question might teeter on the StackOverFlow/ServerFault jurisdictional debate, but I'm trying to investigate from the systems perspective. I have no experience with reverse proxies (and I'm unclear on the benefits) and little with forwarding proxies.

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• Proliant RAID 1 Rebuild Questions

  - by Nicholas

  I have a HP Proliant ML350 G5 server that experienced a power supply failure overnight. The power supply was replaced but unfortunately it got restarted with only 1 disk in the RAID 1 set plugged in. (The raid controller is the build in E200i). The raid BIOS then said on start-up that it had entered Interim Recovery Mode. However I would have expected it to still start up with only the 1 drive. The bios however says that it cannot find a C: drive and enters a reboot loop polling the other boot devices. First question is, is this normal behaviour not to start up on 1 disk? The second drive was then plugged in (all drives are ok) and the raid bios started an automatic rebuild on that disk. This appears to be a background process as there is no progress shown. However based on the light flashing it looks like it is working. My second question is how long will this rebuild take? (36GB 15K SAS drive). I cannot see any error messages and it looks like it is rebuilding the drive ok, but the computer still will not start-up. It still says during the boot up process that the C: drive is not found. If I wait for the rebuild to finish, is it likely to fix itself and find the C: drive? Or is there some other problem here?

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• Implement QoS/Bandwidth Management or Upgrade Bandwidth?

  - by Michael

  A question that I'm faced with currently. Here's my setup: Cisco ASA 5510 15Mbps Internet Connection @ $1350/month The bandwidth was originally meant for 35-45 people but we've grown quite quickly to roughly 60-65 people. Needless to say, when I check bandwidth logs it's almost always spiked at 15Mbps. I did use Wireshark to do some poking around to see what was hogging up our bandwidth but with everything running through CDNs and Cloud Services it proved difficult to get a good grasp of where our bandwidth was going. So the question is do I ONLY implement bandwidth management through ASA OR upgrade the Internet to 50Mbps ($1600/month) and then implement bandwidth management through ASA? Any suggestions on how to segment the 15Mbps connection if we decided ONLY to go with the bandwidth management solution? Thanks. UPDATE 1 Installed PRTG and used packet content to monitor the traffic. As I suspected still pretty vague. My Top Connections include the following: a204-2-160-16.deploy.akamaitechnologies.com ec2-50-16-212-159.compute-1.amazonaws.com a204-2-160-48.deploy.akamaitechnologies.com a72-247-247-133.deploy.akamaitechnologies.com mediaserver-sv5-t1-1.pandora.com Other than the Pandora destination, the rest doesn't tell me much on how to properly control the bandwidth. Any thoughts or suggestions? Thanks. M

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• fsck on LVM snapshots

  - by Alpha01

  I'm trying to do some file system checks using LVM snapshots of our Logical Volumes to see if any of them have dirty file systems. The problem that I have is that our LVM only has one Volume Group with no available space. I was able to do fsck's on some of the logical volumes using a loopback file system. However my question is, is it possible to create a 200GB loopback file system, and saved it on the same partition/logical volume that I'll be taking a snapshot of? Is LVM smart enough to not take a snapshot copy of the actual snapshot? [root@server z]# vgdisplay --- Volume group --- VG Name Web2-Vol System ID Format lvm2 Metadata Areas 1 Metadata Sequence No 29 VG Access read/write VG Status resizable MAX LV 0 Cur LV 6 Open LV 6 Max PV 0 Cur PV 1 Act PV 1 VG Size 544.73 GB PE Size 4.00 MB Total PE 139450 Alloc PE / Size 139450 / 544.73 GB Free PE / Size 0 / 0 VG UUID BrVwNz-h1IO-ZETA-MeIf-1yq7-fHpn-fwMTcV [root@server z]# df -h Filesystem Size Used Avail Use% Mounted on /dev/sda2 9.7G 3.6G 5.6G 40% / /dev/sda1 251M 29M 210M 12% /boot /dev/mapper/Web2--Vol-var 12G 1.1G 11G 10% /var /dev/mapper/Web2--Vol-var--spool 12G 184M 12G 2% /var/spool /dev/mapper/Web2--Vol-var--lib--mysql 30G 15G 14G 52% /var/lib/mysql /dev/mapper/Web2--Vol-usr 13G 3.3G 8.9G 27% /usr /dev/mapper/Web2--Vol-z 468G 197G 267G 43% /z /dev/mapper/Web2--Vol-tmp 3.0G 76M 2.8G 3% /tmp tmpfs 7.9G 92K 7.9G 1% /dev/shm The logical volume in question is /dev/mapper/Web2--Vol-z. I'm afraid if I created the loopback file system in /dev/mapper/Web2--Vol-z and take a snapshot of it, the disk size will be trippled in size, thus running out of disk space available.

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• Sonicwall routing between multiple subnets on multiple interfaces

  - by Rain

  As shown by the network diagram below, I have two completely separate networks. One is being managed by a Sonicwall NSA 220, the other by some other router (the brand is not important). My goal is to allow devices within the 192.168.2.0/24 network to access devices in the 192.168.3.0/24 network. Allowing the reverse (192.168.3.0/24 - 192.168.2.0/24) is not required. So far, I have done the following: I connected the X3 Interface on the Sonicwall to the 192.168.3.0/24 network switch (shown as the dashed red line in the diagram). Next, I gave it a static ip address of 192.168.3.254 and set the Zone to LAN (the same Zone for the X0 interface). Judging by various articles and KBs I've read, this is all that should be necessary, although it does not work. I can ping 192.168.3.254 from any device in the 192.168.2.0/24 network although I cannot ping/connect to any device within the 192.168.3.0/24 network. Any help would be greatly appreciated! Network Diagram: (I asked a similar, yet more complicated, question earlier; although, I realized that I cannot solve that without first solving this (which may actually solve my original question))

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• Initial Review - Mastering Unreal Technology I: Introduction to Level Design with Unreal Engine 3

  - by Matt Christian

  Recently I purchased 3 large volumes on using the Unreal 3 Engine to create levels and custom games.  This past weekend I cracked the spine of the first and started reading.  Here are my early impressions (I'm ~250 pages into it, with appendices it's about 900). Pros Interestingly, the book starts with an overview of the Unreal engines leading up to Unreal 3 (including Gears of War) and follows with some discussion on planning a mod and what goes into the game development process.  This is nice for an intro to the book and is much preferred rather than a simple chapter detailing what is on the included CD, how to install and setup UnrealEd, etc...  While the chapter on Unreal history and planning can be considered 'fluff', it's much less 'fluffy' than most books provide. I need to mention one thing here that is pretty crucial in the way I'm going to continue reviewing this book.  Most technical books like this are used as a shelf reference; as a thick volume you use for looking up techniques every now and again.  Even so, I prefer reading from cover to cover, including chapters I may already be knowledgable on (I'm sure this is typical for most people).  If there was a chapter on installing UnrealEd (the previously mentioned 'fluff'), I would probably force myself to read it, even though I've installed the game and engine multiple times on different systems. Chapter 3 is where we really get to the introduction piece of UnrealEd, creating your first basic level.  This large chapter details creating two small rooms, adding static meshes, adding lighting, creating and adding particle emitters, creating a door that animates with Unreal Matinee and Kismet, static meshes with physics, and other little additions to make your level look less beginner.  This really is a chapter that overviews the entire rest of the book, as each chapter following details the creation and intermediate usages of Static Meshes, Materials, Lighting, etc... One other very nice part to this book is the way the tutorials are setup.  Each tutorial builds off the previous and all are step-by-step.  If you haven't completed one yet, you can find all the starting files on the CD that comes with the book. Cons While the description of the overview chapter (Chapter 3) is fresh in your mind, let me start the cons by saying this chapter is setup extremely confusing for the noob.  At one point, you end up creating a door mesh and setting it up as a InteropMesh so that it is ready to be animated, only to switch to particles and spend a good portion of time working on a different piece of the level.  Yes, this is actually how I develop my levels (jumping back and forth), though it's very odd for a book to jump out of sequence. The next item might be a positive or a negative depending on your skill level with UnrealEd.  Most of the introduction to the editor layout is found in one of the Appendices instead of before Chapter 3.  For new readers, this might lead to confusion as Appendix A would typically be read between Chapter 2 and 3.  However, this is a positive for those with some experience in UnrealEd as they don't have to force themselves through a 'learn every editor button' chapter.  I'm listing this in the Cons section as the book is 'Introduction to...' and is probably going to be directed toward a lot of very beginner developers. Finally, there's a lack of general description to a lot of the underlying engine and what each piece in UnrealEd is or does.  Sometimes you'll be performing Tutorial after Tutorial with barely a paragraph in between describing ANY of what you've just done.  Tutorial 1.1 Step 6 says to press Button X, so you do.  But why?  This is in part a problem with the structure of the tutorials rather than the content of the book.  Since the tutorials are so focused on a step-by-step (or procedural) description of a process, you learn the process and not why you're doing that.  For example, you might learn how to size a material to a surface, but will only learn what buttons to press and not what each one does. This becomes extremely apparent in the chapter on Static Meshes as most of the chapter is spent in 3D Studio Max.  Since there are books on 3DSM and modelling, the book really only tells you the steps and says to go grab a book on modelling if you're really interested in 3DSM.  Again, I've learned the process to develop my own meshes in 3DSM, but I don't know the why behind the steps. Conclusion So far the book is very good though I would have a hard time recommending it to a complete beginner.  I would suggest anyone looking at this book (obviously including the other 2, more advanced volumes) to pick up a copy of UDK or Unreal 3 (available online or via download services such as Steam) and watch some online tutorials and play with it first.  You'll find plenty of online videos available that were created by the authors and may suit as a better introduction to the editor.

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• Browsing Audiobooks on an iPod Nano

  - by Electrons_Ahoy

  The sitation: I've got a stack of audiobooks in MP3 format in my iTunes library, and both an iPhone and an iPod Nano. After this question, I've changed the Media Kind for the audiobook MP3s from Music to Audiobook. This has been, overall, spectacular, as now I can resume where I was, they show up under Audiobooks, etc. On the iPhone, it's also super convenient, since the interface shows what used to be an album with multiple songs as a single book with multiple chapters, and going into "Audiobooks" presents me with a list of books, not tracks. The Nano, on the other hand, is a little strange. After changing the media type and re-syncing the ipod, the files in question are now listed under Audiobooks rather than Music, and the extra Audiobook features are present (resume playback and so on,) but the Audiobooks menu just lists all the MP3 tracks on the iPod in alphabetical order, ignoring whichever book/album they belong to - and doesn't seem to let me browse them any other way. This is, clearly, a little sub-optimal. Did I screw something up? How do I get the Nano to treat the files in a similar way to the way the iPhone and iTunes does - as books with chapters? Is there a step I missed somewhere? Do I need to reformat the iPod? Is this even possible? (Footnote: shameless bump, since this just scored me a tumbleweed.)

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