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• apt-get : Size mismatch

  - by Cédric Girard

  I created a private deb repository to spread a software and it's updates to 600 Ubuntu netbooks. Each time the network is connected, my script try to do a apt-get update. But sometimes (quite often in fact), I have this : Failed to fetch https://myserver/ubuntu/dists/maverick/main/binary-i386/voosicomat.deb Size mismatch The server is an 2.2 Apache, HTTPS only. There is no error on it's logs. Here is the script : apt-get update apt-get dist-upgrade --force-yes --yes Here is the complete output of apt-get Ign https://myserver maverick Release.gpg Ign https://myserver/ubuntu/ maverick/main Translation-en Ign https://myserver maverick Release Ign https://myserver maverick/main i386 Packages/DiffIndex Ign https://myserver maverick/main i386 Packages Ign https://myserver maverick/main i386 Packages Hit https://myserver maverick/main i386 Packages Reading package lists... Reading package lists... Building dependency tree... Reading state information... The following packages will be upgraded: majdb utilitaires voosicomat 3 upgraded, 0 newly installed, 0 to remove and 0 not upgraded. Need to get 6207kB/6273kB of archives. After this operation, 0B of additional disk space will be used. WARNING: The following packages cannot be authenticated! utilitaires voosicomat majdb Get:1 https://myserver/ubuntu/ maverick/main voosicomat all 2.0.1 [4755kB] Get:2 https://myserver/ubuntu/ maverick/main majdb all 1.0.17 [1452kB] Failed to fetch https://myserver/ubuntu/dists/maverick/main/binary-i386/voosicomat.deb Size mismatch Fetched 7091kB in 21s (324kB/s) E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing? Regards Cédric

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• Where to get glib-config for Kubuntu?

  - by Carl Smotricz

  I'm trying to compile Midnight Commander on a KUbuntu 9.10 (Karmic) box with no root access. I've set up a directory under $HOME, downloaded the mc source package and various stuff required for building, such as autotools. I've unpacked the CONTENTS of all those packages into this working directory such that I have the usual ./usr, ./lib, ./etc hierarchy. I manage to get configure through a lot of tests, but I can't seem to fool it into finding glib. checking for glib-2.0... checking for glib-config... no checking for glib12-config... no checking for glib-config... no checking for GLIB - version >= 1.2.6... no *** The glib-config script installed by GLIB could not be found *** If GLIB was installed in PREFIX, make sure PREFIX/bin is in *** your path, or set the GLIB_CONFIG environment variable to the *** full path to glib-config. configure: error: Test for glib failed. GNU Midnight Commander requires glib 1.2.6 or above. My system has glib installed: /lib/libglib-2.0.so.0 /lib/libglib-2.0.so.0.2200.3 ... and I've also downloaded and unpacked the glib package into my working directory: libglib2.0-0_2.22.2-0ubuntu1_i386.deb libglib2.0-dev_2.22.2-0ubuntu1_i386.deb ... but still the elusive glib-config is nowhere to be found. It's not in any debian package for Karmic, either. So I'd appreciate any help getting over this hurdle. Please note, again, that I don't have root, so I can't just merrily apt-get stuff.

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• Problem with setting up raid5 on Freenas, Please help.

  - by Benjy23

  Hey Guys, I've been running Freenas for awhile now. Hardware is 1.8celeron Ram 1GB Sata Card is Via - not sure the model.... its 2 ports and I have 6 x 1.5TB HDs All ran ok while running on 1.5TB, no raid. I'm now trying to create a raid5 with my 6 hds. Software raid... is it normal for it to take roughly up to 2 weeks just to build the raid? Sorry, I'm very new to implementing raid and googling doesn't tell much other than it takes a long time. Also the Raid building process seems to fail many times... going to degraded. I suspect its cos 4 of my HDs are connected to my motherboard and the other 2 are connected to my sata card...what's your take? I'm considering 2 options now... either get a 8 port sata card and attach all the HDs to it. Or get a raid controller 8 portcard which is probably gonna be more pricey... also how do you access hardware raid through Freenas? I like how Freenas emails you should your harddrive fails so can this be done as well with hardware raid? Thanks in advance guys.

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• Triple-monitor set-up (2 unique, 1 cloned): Can a VGA splitter be used on one output of a dual-head

  - by stakx

  Background: I'm currently researching hardware components for some kind of information terminal we're building. This application of ours makes use of three output screens: (1) A touch screen where all user input is made; (2) A regular LCD monitor where the requested information is being displayed; and (3) A projector which displays exactly the same signal as screen (2) does. (All screens will run at the same resolution of 1024x768 btw.) Now I figured that using a dual-head video card would be sufficient, let's say a Matrox P690 low-profile PCI card. This would involve having a Y cable connected to the graphics card itself, then two DVI-to-VGA adapters at each end of the Y cable, and then having a VGA splitter on one of the VGA outputs. The following shows the setup in question: 0--1---------2-> VGA (DSUB-15) \ \ ----2-3---------> VGA (DSUB-15) \ \ -----------------> VGA (DSUB-15) 0: graphics card (LFH60 jack) 1: LFH60 to DVI-I dual monitor Y cable 2: DVI-to-VGA adapters 3: VGA splitter cable Question(s): Will this work? I'm particularly concerned about the following points: Can a low-profile PCI video card output a signal which is strong enough for three monitors (even if it's a dual-head card)? Does the combination of so many adapters and splitter cables work? (The LFH-to-DVI cable comes with the video card) Will the VGA splitter cable degrade the signal on the output screen & projector significantly? (If so, would a USB-powered splitter cable remedy this problem?) I can't possibly expect anyone to answer all those questions, but any input is appreciated.

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• Dependencies problems installing openjdk on Ubuntu

  - by Rodnower

  I try to install openjdk-7-jre: sudo apt-get install openjdk-7-jre But I have dependencies problems: Reading package lists... Done Building dependency tree Reading state information... Done Some packages could not be installed. This may mean that you have requested an impossible situation or if you are using the unstable distribution that some required packages have not yet been created or been moved out of Incoming. The following information may help to resolve the situation: The following packages have unmet dependencies: openjdk-7-jre : Depends: openjdk-7-jre-headless (= 7u7-2.3.2a-0ubuntu0.12.04.1) but it is not going to be installed Depends: libgif4 (>= 4.1.4) but it is not installable Depends: libatk-wrapper-java-jni (>= 0.30.4-0ubuntu2) but it is not installable Recommends: libgnome2-0 but it is not installable Recommends: libgnomevfs2-0 but it is not going to be installed Recommends: ttf-dejavu-extra but it is not installable E: Unable to correct problems, you have held broken packages. This is version of Ubuntu: Ubuntu 12.04.1 LTS I completely don't know how resolve dependencies... Some one can help me? Thank you for ahead.

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• Split MPEG video from command line?

  - by Tim

  I have a homemade DVD that I'm effectively trying to insert chapters into and rearrange - the original author burned it as one long chapter, and I'd like to rip it into smaller pieces and re-encode it into a new DVD. I ripped the DVD with the following command: mplayer dvd:// -dvd-device /dev/sr2 -dumpstream -dumpfile raw.vob I'm running Gentoo Linux with mplayer version 1.0-rc2_p20090731 (the latest available in Portage). I have a list of times that the chapters are supposed to span (for example 30:11-33:25), so my first thought was to rip the entire DVD and use mpgtx to cut out certain pieces of the file. My issue is that running mpgtx -i on the file reports quite a few timestamp jumps: Time stamps jumped from 59.753789 to 0.001622 at position 1d29800 Time stamps jumped from 204963823030450.343750 to 31.165900 at position 2d4f800 Time stamps jumped from 60.077878 to 0.001622 at position 43cc000 Time stamps jumped from 60.024233 to 0.001622 at position 65c5000 Time stamps jumped from 204963823068631.718750 to 52.549244 at position 7fd1000 I've tried to fix the indexes using: mencoder raw.vob -oac copy -ovc copy -forceidx -o fixed.vob -of mpeg But mpgtx will still report timestamp issues. My immediate question: is there a way to take the ripped movie I have and correct its timestamps so I can cut it with mpgtx? If I can get that one issue out of the way, building the rest of the DVD will be smooth sailing. If it's not possible to fix the timestamps on this file: is there a better way to rip small chunks of the DVD into separate files for recompilation later? I'd very much like this to be done on Linux, and it'd be even better if I could script it somehow (feed in a list of start and end positions, or start times and durations, and get out a series of ripped files). If need be, I also have a Mac OS X machine available, but no Windows. Edit: I wound up finding another solution involving HandBrake and ffmpeg (with help from this question), but the question stands. Edit again: Turns out my other solution didn't quite work - the audio desynchronized by about five seconds, in about half of my cut mpgs - so I'm back to square one. Anyone?

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• Problem installing SQLite3 RubyGem on Ubuntu

  - by misbehavens

  I am having a problem trying to install the SQLite3 RubyGem. Here's what I'm doing: $ sudo gem install --remote sqlite3-ruby Here's the output: Building native extensions. This could take a while... ERROR: Error installing sqlite3-ruby: ERROR: Failed to build gem native extension. /usr/bin/ruby1.8 extconf.rb checking for fdatasync() in -lrt... yes checking for sqlite3.h... no *** extconf.rb failed *** Could not create Makefile due to some reason, probably lack of necessary libraries and/or headers. Check the mkmf.log file for more details. You may need configuration options. Provided configuration options: --with-opt-dir --without-opt-dir --with-opt-include --without-opt-include=${opt-dir}/include --with-opt-lib --without-opt-lib=${opt-dir}/lib --with-make-prog --without-make-prog --srcdir=. --curdir --ruby=/usr/bin/ruby1.8 --with-sqlite3-dir --without-sqlite3-dir --with-sqlite3-include --without-sqlite3-include=${sqlite3-dir}/include --with-sqlite3-lib --without-sqlite3-lib=${sqlite3-dir}/lib --with-rtlib --without-rtlib Gem files will remain installed in /usr/lib/ruby/gems/1.8/gems/sqlite3-ruby-1.2.5 for inspection. Results logged to /usr/lib/ruby/gems/1.8/gems/sqlite3-ruby-1.2.5/ext/sqlite3_api/gem_make.out

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• HAProxy is caching the forwarding?

  - by shadow_of__soul

  i'm trying to set up a server structure for an application i'm building in Node.js with socket.io. My setup is: HAProxy frontend forward to -> apache2 as default backend (or nginx, is apache in this local test) -> node.js app if the url has socket.io in the request AND a domain name i have something like: global log 127.0.0.1 local0 log 127.0.0.1 local1 notice maxconn 4096 user haproxy group haproxy daemon defaults log global mode http maxconn 2000 contimeout 5000 clitimeout 50000 srvtimeout 50000 frontend all 0.0.0.0:80 timeout client 5000 default_backend www_backend acl is_soio url_dom(host) -i socket.io #if the request contains socket.io acl is_chat hdr_dom(host) -i chaturl #if the request comes from chaturl.com use_backend chat_backend if is_chat is_soio backend www_backend balance roundrobin option forwardfor # This sets X-Forwarded-For timeout server 5000 timeout connect 4000 server server1 localhost:6060 weight 1 maxconn 1024 check #forwards to apache2 backend chat_backend balance roundrobin option forwardfor # This sets X-Forwarded-For timeout queue 50000 timeout server 50000 timeout connect 50000 server server1 localhost:5558 weight 1 maxconn 1024 check #forward to node.js app The problem comes when i made a request to something like www.chaturl.com/index.html it load perfectly but fails to loads the socket.io files (www.chaturl.com/socket.io/socket.io.js) why it redirect to apache (and should redirect to the node.js app that serve the files). The weird thing is that if i access directly to the socket.io file, after refreshing a few times, it loads, so i suppose is "caching" the forwarding for the client when it makes the first request and reach the apache server. Any suggestion of how this can be solved? or what i can try or look about this?

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• Feasibility of Windows Server 2008 DFS replication over WAN link

  - by CesarGon

  We have just set up a WAN link that connects two buildings in our organisation. The link is provided by a 100-Mbps point to point line. We have a Windows Server 2008 R2 domain controller on each side of the link. Now we are planning to set up DFS for file services across the organisation. The estimated data volume is over 2 TB, and will grow at approximately 20% annually. My idea is to set up a file server in each building and install DFS so that all the contents stay replicated over the 100-Mbps link. I hope that this will ensure that any user will be directed to the closest (and fastest) server when requesting a file from the DFS folders. My concern is whether a 100-Mbps WAN link is good enough to guarantee DFS replication. I've no experience with DFS, so any solid advice is welcome. The line is reliable (i.e. it doesn't crash often) and our data transfer tests show that a 5 MB/sec transfer rate is easily achieved. This is approximately 40% of the nominal bandwidth. I am also concerned about the latency. I mean, how long will users need to wait to see one change on one side of the link after the change has been made on the other side. My questions are: Is this link between networks a reliable infrastructure on which to set up DFS replication? What latency times would be typical (seconds, minutes, hours, days)? Would you recommend that we go for DFS in this scenario, or is there a better alternative? Many thanks.

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• Cannot install git-core using macports

  - by robUK

  Hello, Snow Leopard 10.6.4 mac ports 1.9.1 I have just installed macports and I want to install git-core. However, I get the following errors: ---> Computing dependencies for git-core ---> Dependencies to be installed: python26 db46 gdbm readline sqlite3 rsync popt ---> Building db46 Error: Target org.macports.build returned: shell command failed Log for db46 is at: /opt/local/var/macports/logs/_opt_local_var_macports_sources_rsync.macports.org_release_ports_databases_db46/main.log Error: The following dependencies failed to build: python26 db46 gdbm readline sqlite3 rsync popt Error: Status 1 encountered during processing. To report a bug, see <http://guide.macports.org/#project.tickets> I have tried doing a port selfupdate and a port clean all and then trying to install again. But still get the same problem. I have also tried install the dependent db46 on its own. Here is the log message: :error:build Target org.macports.build returned: shell command failed :debug:build Backtrace: shell command failed while executing "command_exec build" (procedure "portbuild::build_main" line 8) invoked from within "$procedure $targetname" :info:build Warning: the following items did not execute (for db46): org.macports.activate org.macports.build org.macports.destroot org.macports.install This is my first time using mac ports. Many thanks for any suggestions.

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• How to move Mdadm RAID drive (EBS based) to different AWS Instance

  - by Stanley

  We have a media-rich web application that is hosted on AWS. We have several Web Servers and we have an NFS server. On the NFS server (Linux server) we have several EBS volumes that are mounted and we've used mdadm to implement the different mounted volumes as a single RAID volume. The Web Servers simply access the NFS storage through a mount point. Amazon has now let us know that they will be performing power maintenance on this server in a couple of days time. Since all our media is on here it would render our site unusable for the hours while Amazon is working on it. We want to try and prevent this downtime. I was thinking that we can prevent server downtime by perhaps setting up a new server temporarily and attaching the EBS drives (raid volume) to that server and have our web servers point there during maintenance. This is a very high risk operation since this involves several terabytes of our production data. What would be the safe way to move over our logical raid drive (md0) to a new amazon instance? I was hoping that I could start with building the new server, mounting the ebs volumes and assembling the RAID partition using mdadm --assemble --scan before unmounting from the existing instance so that I can first test that everything works and thus having it mounted on two instances at the same time, but I don't believe that is possible with the way that filesystems work. How do I move a Linux software RAID to a new machine? suggests a way to move drives, but isn't really a cloud-based question. Perhaps there are simpler ways to prevent system downtime with our solution being hosted on the cloud? I have considered taking an EBS snapshot, but that tries to replicate all the many terabytes of mounted storage, so this is not a practical solution. Any ideas?

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• How to get automatic upgrades to work on Ubuntu Server?

  - by J. Pablo Fernández

  I followed the documentation for enabling automatic upgrades in Ubuntu servers, but it's not really updating anything at all. My /etc/apt/apt.conf.d/50unattended-upgrades looks almost like the default. // Automatically upgrade packages from these (origin, archive) pairs Unattended-Upgrade::Allowed-Origins { "Ubuntu karmic-security"; "Ubuntu karmic-updates"; }; // List of packages to not update Unattended-Upgrade::Package-Blacklist { // "vim"; // "libc6"; // "libc6-dev"; // "libc6-i686"; }; // Send email to this address for problems or packages upgrades // If empty or unset then no email is sent, make sure that you // have a working mail setup on your system. The package 'mailx' // must be installed or anything that provides /usr/bin/mail. Unattended-Upgrade::Mail "[email protected]"; // Automatically reboot *WITHOUT CONFIRMATION* if a // the file /var/run/reboot-required is found after the upgrade //Unattended-Upgrade::Automatic-Reboot "false"; The directory /var/log/unattended-upgrades/ is empty. Running /etc/init.d/unattended-upgrades start is not very nice: root@mozart:~# /etc/init.d/unattended-upgrades start Checking for running unattended-upgrades: root@mozart:~# Something seems to be broken, but I'm not sure why. I have pending updates and they are not being applied: root@mozart:~# aptitude safe-upgrade Reading package lists... Done Building dependency tree Reading state information... Done Reading extended state information Initializing package states... Done The following packages will be upgraded: linux-libc-dev 1 packages upgraded, 0 newly installed, 0 to remove and 0 not upgraded. Need to get 0B/743kB of archives. After unpacking 4096B will be used. Do you want to continue? [Y/n/?] In all the servers I have, unattended upgrades seems to have been disabled: root@mozart:~# apt-config shell UnattendedUpgradeInterval APT::Periodic::Unattended-Upgrade root@mozart:~# Any ideas what am I missing?

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• Weird PCI bug: lots of missed packets, or data comes in "bursts"

  - by Thomas O

  I have an ABIT KN9 motherboard. It has one PCI-e x16 slot, three PCI-e x4 slots and two legacy PCI. My problem is with the legacy PCI (which I shall just call "PCI".) I currently have an Nvidia GeForce 8600 GT (a low end card) installed in the x16 slot and a TV card in PCI #1; the x4 slots are unused, as is PCI #2. I plan to upgrade the graphics card soon, the current card was spare. I sometimes install a USB expander in PCI #2 but it causes a lot of problems - see below. The problem is under Linux (Ubuntu 10.10, Linux 2.6.35-22-generic), but probably under all operating systems (I have not yet been able to test Windows, but I suspect it will do the same as the problems occur on the BIOS/POST side too, e.g. when using a USB keyboard on the expander the keyboard will not work at all) PCI has an enourmous delay, and packets arrive in large chunks. For example, when using the USB expander, my USB mouse lags and jumps in large steps every second or so, while using the motherboard USB does not present this problem. My TV card will only do one or two frames per second, and the program (xawtv) usually times out and crashes. In dmesg, I'm getting messages like: bttv0: timeout: drop=74, irq=154/100476, risc=31f6256c, bits: VSYNC HSYNC OFLOW RISCI for my TV card, and similar timeout issues for my USB expander with a mouse. I received the motherboard, processor and RAM second hand and have only just got around to building it, so I don't know if this problem has always existed, or if it's a result of my set up. If anyone has any hints or solutions it would be appreciated - this is kind of a show-stopper for me.

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• installing Conkeror on Ubuntu 12.04

  - by Menelaos Perdikeas

  I am reading the instructions on conkeror site (and elsewhere) on how to install conkeror on Ubuntu (I am using Ubuntu 12_04 LTS) and it seems that the correct sequence is: sudo apt-add-repository ppa:xtaran/conkeror sudo apt-get update sudo apt-get install conkeror conkeror-spawn-process-helper The first step (apt-add-repository) seems to execute without a problem, giving the following output: You are about to add the following PPA to your system: Conkeror Debian packages for Ubuntu releases without xulrunner (i.e. for 11.04 Natty and later) More info: https://launchpad.net/~xtaran/+archive/conkeror Press [ENTER] to continue or ctrl-c to cancel adding it Executing: gpg --ignore-time-conflict --no-options --no-default-keyring --secret- keyring /tmp/tmp.Re7pWaDEQF --trustdb-name /etc/apt/trustdb.gpg --keyring /etc/apt/trusted.gpg --primary-keyring /etc/apt/trusted.gpg --keyserver hkp://keyserver.ubuntu.com:80/ --recv CB29CBE050EB1F371BAB6FE83BE0F86A6D689050 gpg: requesting key 6D689050 from hkp server keyserver.ubuntu.com gpg: key 6D689050: "Launchpad PPA for Axel Beckert" not changed gpg: Total number processed: 1 gpg: unchanged: 1 However, the apt-get update seems unable to fetch packages from the newly added PPA, with its output ending in: Hit http://security.ubuntu.com precise-security/restricted Translation-en Hit http://security.ubuntu.com precise-security/universe Translation-en Err http://ppa.launchpad.net precise/main Sources 404 Not Found Ign http://extras.ubuntu.com precise/main Translation-en_US Err http://ppa.launchpad.net precise/main i386 Packages 404 Not Found Ign http://extras.ubuntu.com precise/main Translation-en Ign http://ppa.launchpad.net precise/main Translation-en_US Ign http://ppa.launchpad.net precise/main Translation-en W: Failed to fetch http://ppa.launchpad.net/xtaran/conkeror/ubuntu/dists/precise /main/source/Sources 404 Not Found W: Failed to fetch http://ppa.launchpad.net/xtaran/conkeror/ubuntu/dists/precise/main/binary-i386/Packages 404 Not Found E: Some index files failed to download. They have been ignored, or old ones used instead. Accordingly, apt-get-install conkeror fails with: mperdikeas@mperdikeas:~$ sudo apt-get install conkeror Reading package lists... Done Building dependency tree Reading state information... Done E: Unable to locate package conkeror Any ideas what might be wrong ?

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• Jenkins shell command isn't executing

  - by Dmitro

  In Jenkins project I add command for executiong rm /var/www/ru.liveyurist.ru/tmp/* But when I build project I get error: Started by user anonymous Building in workspace /var/www/ru.myproject.ru Updating https://subversion.assembla.com/svn/myproject/trunk At revision 1168 no change for https://subversion.assembla.com/svn/liveexpert/trunk since the previous build [ru.myproject.ru] $ /bin/sh -xe /tmp/hudson7189633355149866134.sh FATAL: command execution failed java.io.IOException: Cannot run program "/bin/sh" (in directory "/var/www/ru.myproject.ru"): java.io.IOException: error=12, Cannot allocate memory at java.lang.ProcessBuilder.start(ProcessBuilder.java:475) at hudson.Proc$LocalProc.<init>(Proc.java:244) at hudson.Proc$LocalProc.<init>(Proc.java:216) at hudson.Launcher$LocalLauncher.launch(Launcher.java:709) at hudson.Launcher$ProcStarter.start(Launcher.java:338) at hudson.Launcher$ProcStarter.join(Launcher.java:345) at hudson.tasks.CommandInterpreter.perform(CommandInterpreter.java:82) at hudson.tasks.CommandInterpreter.perform(CommandInterpreter.java:58) at hudson.tasks.BuildStepMonitor$1.perform(BuildStepMonitor.java:19) at hudson.model.AbstractBuild$AbstractRunner.perform(AbstractBuild.java:703) at hudson.model.Build$RunnerImpl.build(Build.java:178) at hudson.model.Build$RunnerImpl.doRun(Build.java:139) at hudson.model.AbstractBuild$AbstractRunner.run(AbstractBuild.java:473) at hudson.model.Run.run(Run.java:1410) at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:46) at hudson.model.ResourceController.execute(ResourceController.java:88) at hudson.model.Executor.run(Executor.java:238) Caused by: java.io.IOException: java.io.IOException: error=12, Cannot allocate memory at java.lang.UNIXProcess.<init>(UNIXProcess.java:164) at java.lang.ProcessImpl.start(ProcessImpl.java:81) at java.lang.ProcessBuilder.start(ProcessBuilder.java:468) ... 16 more Build step 'Execute shell' marked build as failure Finished: FAILURE I started Jenkins from root user. Please advise what can be reason of this error?

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• How to debug a kernel created using ubuntu-vm-builder?

  - by user265592

  Aim: Trying to perform a code walkthrough of what functions are getting called for sending and receiving packets over the network. I am building a kernel and using gdb for debugging/ tracing purposes. I have build a vm using the following command : time sudo ubuntu-vm-builder qemu precise --arch 'amd64' --mem '1024' --rootsize '4096' --swapsize '1024' --kernel-flavour 'generic' --hostname 'ubuntu' --components 'main' --name 'Bob' --user 'ubuntu' --pass 'ubuntu' --bridge 'br0' --libvirt 'qemu:///system' And I can run the VM successfully in qemu using the following command: qemu-system-x86_64 -smp 1 -drive file=tmpGgEOzK.qcow2 "$@" -net nic -net user -serial stdio -redir tcp:2222::22 Now, I want to debug the kernel using gdb. For this I need an executable with debug symbols(vmlinux), which apparently I don't have, as the vm-builder never asked for any such options and simply created a .qcow2 file. Question 1: Am I taking the correct approach to solve the problem and is there an easier way to do it? Question 2: Is there a way to debug this kernel using GDB? P.S: I don't have hardware support for KVM. Please correct me if I am wrong. Thanks.

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• Why does this preseed for gitolite fail?

  - by troutwine

  I'm installing gitolite on a Debian Squeeze box with the following preseed: gitolite gitolite/gituser string git gitolite gitolite/adminkey string ssh-rsa AAAAB3ECT gitolite gitolite/gitdir string /var/lib/git On installation: # debconf-set-selections /var/cache/debconf/gitolite.preseed # apt-get install gitolite Reading package lists... Done Building dependency tree Reading state information... Done Suggested packages: git-daemon-run gitweb The following NEW packages will be installed: gitolite 0 upgraded, 1 newly installed, 0 to remove and 26 not upgraded. Need to get 0 B/114 kB of archives. After this operation, 348 kB of additional disk space will be used. Preconfiguring packages ... Selecting previously deselected package gitolite. (Reading database ... 24715 files and directories currently installed.) Unpacking gitolite (from .../gitolite_1.5.4-2+squeeze1_all.deb) ... Setting up gitolite (1.5.4-2+squeeze1) ... adduser: The home dir must be an absolute path. dpkg: error processing gitolite (--configure): subprocess installed post-installation script returned error exit status 1 configured to not write apport reports Errors were encountered while processing: gitolite E: Sub-process /usr/bin/dpkg returned an error code (1) Why? The pre-seed was extracted from a manually configured installation, per here and exists without issue on another machine.

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• Changing Corosync/Heartbeat pair's active node based on MySQL/Galera cluster state

  - by Hace

  Background I'm planning on building a High Availability "cluster" for our Zabbix instance by placing two physical servers in one server room and two in another server room. In each server room one of the physical servers will run Zabbix on RHEL and the other will run Zabbix's MySQL database, also on RHEL. I'd prefer synchronous replication for the MySQL nodes so I'm planning on using Galera in a master-slave configuration. The Zabbix instances on the two Zabbix servers would be controlled by Heartbeat/Corosync (although Red Hat Cluster Suite is also an option...) If the Zabbix server in Server Room A goes down, the one in Server Room B becomes active (and vice versa). Ditto for the MySQL servers/instances. If either of those cases happen, however, the connection between the Zabbix server and the MySQL server becomes significantly slower as ti has to travel over WAN. Question Is it possible to configure the Heartbeat/CoroSync pair to instruct the MySQL/Galera cluster to change the master node to switch to (if available) the one that's in the server room as the active Heartbeat/Corosync -node and (more challengingly) is it possible to do the same in the other direction, i.e have the Galera cluster change the active Heartbeat/CoroSync server to be in the same room as the active MySQL master server in case of a failover in over to avoid unnecessary WAN transfers between the application and its DB? Theories Most likely I can get CoroSync to run something that'd log in to one of the DB nodes to change the MySQL/Galera master but I don't know if it's really possible to do anything similar in the other direction in Galera. Is it possible to define a "service" in CoroSync/Heartbeat so that both the service and its MySQL service would migrate as one if possible. Using the DB server that's behind WAN should still be a better option to DB downtime. Am I just using too many tools to solve a problem that'd be far simpler with something else?

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• Microsoft Application Request Routing with Windows Authentication

  - by theplatz

  I'm running into a problem trying to get Windows Authentication working in an environment that uses Microsoft Application Request Routing and was hoping someone might be able to help. The problem I'm running into is that only some requests are authenticated, while others fail with 401 errors. I have followed the Special Case of Running IIS 7.0 in a Web Farm instructions found at http://blogs.msdn.com/b/webtopics/archive/2009/01/19/service-principal-name-spn-checklist-for-kerberos-authentication-with-iis-7-0.aspx to no avail. My current server setup looks like the following: ARR Two servers set up with IIS shared configuration using IIS 7.5 on Windows 2008 R2 Anonymous authentication turned on for the Default Web Site Web Farm Two servers running IIS 7.5 on Windows 2008 R2 Three web sites set up using port binding to differentiate between virtual hosts. Ports being used are 8000, 8001, and 8002 Application pools for Windows Authentication all use a common domain account SPN added to domain account for http/<virthalhost-name>:<port-number> and http/<virtualhost-name>.<fully-qualified-domain>:<port-number> The IIS logs show the following when authentication is working/failing. If I understand correctly, all requests should show DOMAIN\User_Name: 2012-11-19 15:03:17 CLUSTER-IP-ADDRESS GET /home/stylesheets/techweb.landing.css - 8002 DOMAIN\User_Name ARR-HOST-1-IP-ADDRESS 200 0 0 62 2012-11-19 15:03:17 CLUSTER-IP-ADDRESS GET /home/images/user-background-right.gif - 8002 - ARR-HOST-1-IP-ADDRESS 401 2 5 0 2012-11-19 15:03:17 CLUSTER-IP-ADDRESS GET /home/images/user-background-left.gif - 8002 DOMAIN\User_Name ARR-HOST-IP-ADDRESS 200 0 0 31 2012-11-19 15:03:17 CLUSTER-IP-ADDRESS GET /home/images/user-icon.png - 8002 - ARR-HOST-1-IP-ADDRESS 401 2 5 0 2012-11-19 15:03:17 CLUSTER-IP-ADDRESS GET /home/images/user-icon.png - 8002 - ARR-HOST-1-IP-ADDRESS 401 1 2148074248 0 2012-11-19 15:03:17 CLUSTER-IP-ADDRESS GET /home/images/application-icon.png - 8002 - ARR-HOST-1-IP-ADDRESS 401 1 2148074248 0 2012-11-19 15:03:17 CLUSTER-IP-ADDRESS GET /home/images/user-background-right.gif - 8002 - ARR-HOST-1-IP-ADDRESS 401 1 3221225581 15 2012-11-19 15:03:17 CLUSTER-IP-ADDRESS GET /home/images/building.gif - 8002 DOMAIN\User_Name ARR-HOST-2-IP-ADDRESS 200 0 0 218 Does anyone know what might cause this problem and how I can resolve it?

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• Corliss Expert Group Home Security: How to Secure Your Home without Spending Too Much?

  - by Mika Esmond

  HOME SECURITY: HOW TO SECURE YOUR HOME WITHOUT SPENDING TOO MUCH Imagine if there were no burglar or criminals who threaten the safety of our homes; we will be surprised how much savings we would have on several things we do to secure ourselves and our loved ones. We would not need fences, gates with locks, doors locks, window grills, CCTV cams, perimeter lighting, shotguns and baseball bats. The cost of maintaining these things can run up to the entire cost of building another room or, in some cases, a whole new house. The rationale for home security is the same for national security. A nation maintains an army whether it has enemies or not; so, whether burglars will come or not, we have to prepare for the eventuality. Hence, we end up spending for something we might never put into the actual use it was intended for. You buy a pistol and when a burglar breaks in you fire the gun either to scare or disable the intruder. We hope we will never have to use these things; but we still buy them for the peace of mind that comes from knowing we can secure or protect our family and home.

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• Trouble getting latest version of Git

  - by TheMethod

  I am using Ubuntu 10.04 LTS. I'm looking at using git as source control for personal projects and Github as a remote repository. I was having trouble pushing a commit to my remote github repo getting the following error message: The requested URL returned error: 403 while accessing https://github.com/Jstall/helloworld.git/info/refs When I did some digging I found that the problem could be me not having the latest version of Git. When I did a --version I found that I have version 1.7.0.4 locally. So I tried to update git using: sudo apt-get install git but get the following error: Reading package lists... Done Building dependency tree Reading state information... Done Package git is not available, but is referred to by another package. This may mean that the package is missing, has been obsoleted, or is only available from another source E: Package git has no installation candidate I've tried running: sudo apt-get update and trying again but it didn't seem to make a difference. I'm not sure if it's relevant but I'm also getting a couple of 404's when I run update: Err http://wine.budgetdedicated.com edgy/main Packages 404 Not Found Fetched 4,117B in 0s (5,142B/s) W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/edgy/universe/binary-i386/Packages.gz 404 Not Found [IP: 91.189.91.15 80] W: Failed to fetch http://wine.budgetdedicated.com/apt/dists/edgy/main/binary-i386/Packages.gz 404 Not Found I'm not sure when I should try next. Could anyone suggest a course of action to get this resolved? Any advice would be appreciated. Thanks much!

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• How to install the MySQL Ruby Gem on Ubuntu 9.10?

  - by misbehavens

  I am having a problem installing the Ruby Gem for MySQL. This is the command that I am running: sudo gem install mysql and this is the output that I'm getting: Building native extensions. This could take a while... ERROR: Error installing mysql: ERROR: Failed to build gem native extension. /usr/bin/ruby1.8 extconf.rb checking for mysql_query() in -lmysqlclient... no checking for main() in -lm... yes checking for mysql_query() in -lmysqlclient... no checking for main() in -lz... yes checking for mysql_query() in -lmysqlclient... no checking for main() in -lsocket... no checking for mysql_query() in -lmysqlclient... no checking for main() in -lnsl... yes checking for mysql_query() in -lmysqlclient... no checking for main() in -lmygcc... no checking for mysql_query() in -lmysqlclient... no *** extconf.rb failed *** Could not create Makefile due to some reason, probably lack of necessary libraries and/or headers. Check the mkmf.log file for more details. You may need configuration options. Provided configuration options: --with-opt-dir --without-opt-dir --with-opt-include --without-opt-include=${opt-dir}/include --with-opt-lib --without-opt-lib=${opt-dir}/lib --with-make-prog --without-make-prog --srcdir=. --curdir --ruby=/usr/bin/ruby1.8 --with-mysql-config --without-mysql-config --with-mysql-dir --without-mysql-dir --with-mysql-include --without-mysql-include=${mysql-dir}/include --with-mysql-lib --without-mysql-lib=${mysql-dir}/lib --with-mysqlclientlib --without-mysqlclientlib --with-mlib --without-mlib --with-mysqlclientlib --without-mysqlclientlib --with-zlib --without-zlib --with-mysqlclientlib --without-mysqlclientlib --with-socketlib --without-socketlib --with-mysqlclientlib --without-mysqlclientlib --with-nsllib --without-nsllib --with-mysqlclientlib --without-mysqlclientlib --with-mygcclib --without-mygcclib --with-mysqlclientlib --without-mysqlclientlib Gem files will remain installed in /usr/lib/ruby/gems/1.8/gems/mysql-2.8.1 for inspection. Results logged to /usr/lib/ruby/gems/1.8/gems/mysql-2.8.1/ext/mysql_api/gem_make.out What do I need to do in order to get this to install?

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• Build suggestion for mini itx server [on hold]

  - by Spyros

  I am looking to create a home server and since there does not seem to be a nice ready made one to purchase, i thought of building a mini itx one. I am not familiar with the best hardware/case to pick and therefore i thought i would ask for your experience. I will most probably install a simple linux distro, probably Debian and most probably without a desktop environment as well. Therefore, I am not looking for the best graphics card, though a decent one is preferred for sure. I would say that the most important thing is that the case/hardware play well with each other and the machine has decent specs ( i think something like 8gb RAM and 1TB hdd is most probably my most important things). I understand that this question can be closed as subjective, but it would be a great help for me if some of you guys who have been doing a similar build, can suggest something. I tried to find a stack exchange variant for the question, but it seems that this one more closely relates to the subject. But I will definitely understand it if people close it due to being subjective in nature. If you can maybe move it somewhere or so, please feel free to do so. Thank you for your time :)

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• What's the piece of hardware listening on Facebook's or Wikipedia's IP address?

  - by Igor Ostrovsky

  I am trying to understand how massive sites like Facebook or Wikipedia work, for my intellectual curiosity. I read about various techniques for building scalable sites, but I am still puzzled about one particular detail. The part that confuses me is that ultimately, the DNS will map the entire domain to a single IP address, or a handful of IP addresses in the case of round-robin DNS. For example, wikipedia.org has only one type-A DNS record. So, people from all over the world visiting Wikipedia have to send a request to the one IP address specified in DNS. What is the piece of hardware that listens on the IP address for a massive site, and how can it possibly handle all the load coming from the requests for users all over the world? Edit 1: Thanks for all the responses! Anycast seems like a feasible answer... Does anyone know of a way to check whether a particular IP address is anycast-routed, so that I could verify that this really is the trick used in practice by large sites? Edit 2: After more reading on the topic, it appears that anycast is not typically used for dynamic web content. Anycast is usually used for UDP (e.g., DNS lookups), or sometimes for static content. One interesting thing to note is that Facebook uses profile.ak.fbcdn.net to host static content like style sheets and javascript libraries. Each time I ping this name, I get a response from a different IP address. However, I can't tell whether this is anycast in action, or a completely different technique. Back to my original question: as far as I can tell, even a large site will have a single expensive piece of load-balancing hardware listening on its handful of public IP addresses.

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• EC2: is an instance's public DNS stable? Can I rely on it not changing?

  - by Aseem Kishore

  I'm new to Amazon EC2. I've launched my first instance, and am using it as a web server. I see that it has a public DNS (a public URL), e.g.: ec2-123-45-6-789.compute-1.amazonaws.com I can successfully go to this server in my browser, hit it via cURL, etc. I want to use this web server for a back-end service in an app I'm building, so I placed this URL in my app's config, and it works great. But when I manually stop and re-started my instance, I see that the public DNS changes! I've read that this happens when you explicitly stop and re-start, but doesn't happen if you just "reboot". I don't plan on explicitly stopping and re-starting this server ever, but my question is: will this public DNS ever change on its own for any reason? E.g. if the machine abnormally crashes, or whatever. In other words, is it safe to ship an app that's wired to this URL? Thanks!

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