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• No wubildr, No spaceleft, Boot Error and A previous installation was detected in D:\ubuntu. Please uninstall that before continuing

  - by tdc2bdc

  At first I was downloading Ubuntu 12.10 using Windows Installer, but I cancelled it after just 2-3 minutes and dowloaded 32-Bit ISO (ubuntu-12.10-desktop-i386). Then I created bootable USB Stick (new HP 210 v210 w) using Pendrivelinux (Universal-USB-Installer-1.9.1.4). I Formatted D Drive. (Both by Windows & EaseUS) I've set boot priority correctly. But after getting message "Boot Error", I ran wubi.exe directly from USB drive. Now the message is "A previous installation was detected in D:\ubuntu. Please uninstall that before continuing." I formatted D: again and performed disk check, surface test using EaseUS. It shows no error or bad sectors. Formatted & checked my pendrive too. Directly ran .iso. But same error keeps coming. I found way around above problems, by copying extracted .iso on D:\ and installing Ubuntu using wubi.exe and though on boot it was shown with Windows 7, selecting it caused following error Try hd(0,0): NTFS5 : No wubildr Try hd(0,1): NTFS5 : So, I uninstalled it and Reeinstalled it Now installation fails at around 7mins saying " An error occurred. No space left on device. For more info please see log file " My D: is a 9 GB partition. (99% Free) Ubuntu Site 12.10 says it needs around 4.5 GB. Now Trying it by extendin D: to 10 GB... Got No wubildr. Please help. tdc2bdc

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• Where to ask questions related to ubuntu app developer showdown?

  - by user49557

  i recently saw ubuntu app developer showdown and i am very excited about it. i have some questions about it and i seriously want good answers can you tell me an official or unofficial communities forums or emails where i can get good anwsers thanks. Can I use old code by myself to build on for my entry in the Ubuntu App Showdown contest? How do I participate in the Ubuntu App Showdown? already seen these questions

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• How to safely upgrade from an older Ubuntu version to a newer one?

  - by NikTh

  How can I safely upgrade an Ubuntu installation from one release to another? What should I do before upgrading to ensure it goes smoothly, and is there any clean-up I need to do afterwards? In particular, do I need to do anything special if I am using packages from PPAs, if I have a graphics card that needs drivers, or if I'm running a custom Linux kernel? This is a general question , but as example we take Ubuntu 12.04 and Ubuntu 12.10

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• Backdoor in OpenBSD how is it that no developer saw it ? And what about other Linux ? [closed]

  - by user310291

  It had been revealed that there have been backdoor implanted in OpenBSD http://www.infoworld.com/d/developer-world/software-security-honesty-the-best-policy-285 OpenBSD is opensource, how is it that nobody in the community developper could see it in the source code ? So how can one trust all the other "opensource" Linux Of course OpenBSD is only a case, the point is not about OpenBSD, it is about opensource in general. my question is not about Openbsd per se it's about source code os inspection especially c/c++ since most are written in these languages. Also once the source is compiled how one can be sure that it really reflects the source code ? If a law requires that a backdoor being implanted and obliges to deny that kind of action under the guise of security, how can you be sure that the system has not been corrupted by some tools ? As said there is there is a "nondisclosure agreement" My guess is that 99.99% of developpers in the world are just incapable of understanding os source code and won't even bother to look at it. And above all nobody wonders about why the gov wants such massive backdoor, and that of course they will pressure medias to deny.

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• Ubuntu12.04 crashed while trying to install Ubuntu14.04, no longer have access

  - by FACE

  Posting from my laptop, as my Compaq desktop crashed. Not very computer saavy, and not sure what info I should provide...but here's a start: 9 year old desktop Compaq SR 1650NX, AMD Athlon 3500+ probably 1 gB ram (duh....) Was running 12.04....was attempting to upgrade to 14.04, not sure if I interrupted it. Pretty much stuck on (constantly redirected to) a page which says "GNU Grub version 1.99-2"; it offers several choices (as written): Ubuntu, with Linux 3.2.0-67-generic Ubuntu, with Linux 3.2.0-67-generic (recovery mode) Previous Linux versions Memory Test (memtest86+) Memory Test (memtest86+, serial console 115200) But none of the selections seem to be able to get me anywhere (i.e., I click yes, but can't seem to run any commands - not that I know anything useful); I escape from those pages by repeatedly hitting CTRL-ALT-DEL Any help would be appreciated; will provide additional info when requested. Thanx (hopefully), in advance. (If I don't respond immediately, it just means I had to attend to other concerns...will leave page open and check back in as often as possible). FACE

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• Gnome-Applets Package Causing Gnome to Segfault

  - by FranticPedantic

  When I boot ubuntu I get a bunch of windows saying "The panel encountered a problem while loading: OAFIID:GNOME_ShowDesktopApplet", with a bunch of others(5) besides ShowDesktopApplet. I am able to launch a terminal, and I do have the taskbar at the top, although the bar at the bottom that holds the windows is blank, so when I minimize a window it disappears. Furthermore, when I try to launch most applications (firefox for example) it segfaults. I have googled the error but it seems to be common but general issue, and a lot of the solutions that worked for others didn't work for me. I tried deleting the gconf, gnome, and gnome2 folders in my home directory. I tried deleting a bunch of the gnome folders (although I might have done this wrong, I was confused as to which ones). I have also tried to use apt-get and dpkg to re-install ubuntu-desktop and gnome-applets. However, when I try apt-get install ubuntu-desktop I get errors regarding /var/cache/apt/archives/gnome-applets_2.28.0-0ubunt2_amd64.deb I tried dpkg --configure -a and interestingly I get Package gnome-applets is not installed. When I try to use apt-get to install it, that same pesky problem pops up error processing /var/cache/apt/archives/gnome-applets_2.28.0-0ubunt2_amd64.deb (--unpack) subprocess new post-removal script returned error exist status 245 sub process /usr/bin/dpkg returned an error code(1) This file has been popping up with regards to a lot of the solutions suggested I see. Any ideas?

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• "Could not claim interface on camera: -6" when trying to connect usb camera (Kinect)

  - by rzetterberg

  I have installed the freenect library from openkinect.org. With that library there is a demo application which you can run from the terminal to test out the Kinect. However when I run this command I get the following output: richard@behemoth:~$ sudo freenect-glview Kinect camera test Number of devices found: 1 Could not claim interface on camera: -6 Could not open device This particular error is thrown by the library libusb by the function libusb_claim_interface and the error -6 corresponds to the LIBUSB_ERROR_BUSY. So my guess is that it has something to do with mounting the usb, rather than specifically the freenect library or the Kinect itself. So my question is how can I find out what resource is using this interface and how can I free it so that I can access it? Edit: What I have tried so far (just to be sure): Rebooted Plugged-out, plugged-in Tried different usb ports Restarted udev Additional information that might be useful: /etc/fstab: # /etc/fstab: static file system information. # # Use 'blkid -o value -s 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). # # <file system> <mount point> <type> <options> <dump> <pass> proc /proc proc nodev,noexec,nosuid 0 0 # / was on /dev/sda1 during installation UUID=1c73f217-ac8d-451b-8390-7a680628a856 / ext4 errors=remount-ro 0 1 # swap was on /dev/sda5 during installation UUID=bb49bd29-07ec-45a0-bbab-46fb8362b06b none swap sw 0 0 sudo uname -r: Linux behemoth 3.0.0-14-generic-pae #23-Ubuntu SMP Mon Nov 21 22:07:10 UTC 2011 i686 i686 i386 GNU/Linux cat /etc/lsb-release DISTRIB_ID=Ubuntu DISTRIB_RELEASE=11.10 DISTRIB_CODENAME=oneiric DISTRIB_DESCRIPTION="Ubuntu 11.10"

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• SATA drives or chipset throwing DRDY ERR and ICRC ABRT

  - by Matt

  I have an SD-VIA-1A2S PCI card with 2 sata ports (and one ATA-133 that isn't used). Two new Western Digital Caviar Green drives (WD10EARS 1TB) throw repeated errors in kern.log (removed date/time/host info for brevity): [ 7.376475] ata2.00: exception Emask 0x12 SAct 0x0 SErr 0x1000500 action 0x6 [ 7.376480] ata2.00: BMDMA stat 0x5 [ 7.376483] ata2: SError: { UnrecovData Proto TrStaTrns } [ 7.376489] ata2.00: cmd c8/00:40:20:00:00/00:00:00:00:00/e0 tag 0 dma 32768 in [ 7.376490] res 51/84:2f:20:00:00/00:00:00:00:00/e0 Emask 0x12 (ATA bus error) [ 7.376493] ata2.00: status: { DRDY ERR } [ 7.376495] ata2.00: error: { ICRC ABRT } [ 7.376504] ata2: hard resetting link I'm using Ubuntu 9.04 - 2.6.28-18-generic, though I have tried live cds of Ubuntu 9.10, Fedora 12 and OpenSUSE 11.2 - all running various 2.6.31 kernels - and all received the same error. Based on testing these drives and this card in two other machines and combos of connecting the drives directly to the motherboard or the add-in card, I'm relatively convinced that it's the VIA chipset that is the problem. Another computer that also has an onboard VIA SATA chipset (like the add-in card) produces the same errors when the drives are directly on that motherboard. I have been able to verify that the drives are perfectly good, and I tried everything I can think of in terms of swapping cables, psu isn't overloaded, etc. The error happens on boot once or twice, after using fdisk on the drive once or twice, and constantly when attempting to sync a new mdadm raid 1 array created on the two drives. Any thoughts on where to go from here - driver/kernel wise? I'm completely open to buying a new PCI add-in card if someone can recommend one with 2 internal sata ports that works well in Debian/Ubuntu. Thanks!

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• X11 performance problem after upgrading from Centos3 to Centos5 with an ATI Rage XL

  - by Marcelo Santos

  After upgrading a computer from Centos3 to Centos5 an application that does a lot of scrolling took a very high performance hit. top tells me that X is using a lot of CPU and that was not happening before. The machine has an ATI Rage XL with 8MB and X is using the ati driver as there is no proprietary ATI driver for this board on linux. The xorg.conf: Section "Device" Identifier "Videocard0" Driver "ati" EndSection Section "Screen" Identifier "Screen0" Device "Videocard0" DefaultDepth 24 SubSection "Display" Viewport 0 0 Depth 24 Modes "1024x768" "800x600" "640x480" EndSubSection EndSection Section "DRI" Group 0 Mode 0666 EndSection A similar machine that still has Centos3 installed is able to start DRI on the X server while this one is not, this is the Xorg.0.log for the Centos5 machine: drmOpenDevice: node name is /dev/dri/card0 drmOpenDevice: open result is -1, (No such device or address) drmOpenDevice: open result is -1, (No such device or address) drmOpenDevice: Open failed drmOpenDevice: node name is /dev/dri/card0 drmOpenDevice: open result is -1, (No such device or address) drmOpenDevice: open result is -1, (No such device or address) drmOpenDevice: Open failed [drm] failed to load kernel module "mach64" (II) ATI(0): [drm] drmOpen failed (EE) ATI(0): [dri] DRIScreenInit Failed (II) ATI(0): Largest offscreen areas (with overlaps): (II) ATI(0): 1024 x 1279 rectangle at 0,768 (II) ATI(0): 768 x 1280 rectangle at 0,768 (II) ATI(0): Using XFree86 Acceleration Architecture (XAA) Screen to screen bit blits Solid filled rectangles 8x8 mono pattern filled rectangles Indirect CPU to Screen color expansion Solid Lines Offscreen Pixmaps Setting up tile and stipple cache: 32 128x128 slots 10 256x256 slots (==) ATI(0): Backing store disabled (==) ATI(0): Silken mouse enabled (II) ATI(0): Direct rendering disabled (==) RandR enabled I also tried using EXA instead of XAA and setting: Option "AccelMethod" "XAA" Option "XAANoOffscreenPixmaps" "true" uname -a Linux sir5.erg.inpe.br 2.6.18-128.7.1.el5 #1 SMP Mon Aug 24 08:20:55 EDT 2009 i686 i686 i386 GNU/Linux rpm -qa | grep xorg-x11-server xorg-x11-server-utils-7.1-4.fc6 xorg-x11-server-sdk-1.1.1-48.52.el5 xorg-x11-server-Xvfb-1.1.1-48.52.el5 xorg-x11-server-Xnest-1.1.1-48.52.el5 xorg-x11-server-Xorg-1.1.1-48.52.el5 The drmOpenDevice error continues when using the suggested Option "AIGLX" "true".

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• Redhat 5.5: Multi-thread process only uses 1 CPU of the available 8

  - by Tonny

  Weird situation: Redhat Enterprise 5.5 (stock install, no updates, x64) on a HP z800 workstation. (Dual Xeon 2,2 Ghz. 8 cores, 16 if you count Hyper-threading. RH sees 16 cores.) We have an application that can utilize 1, 2 or 4 threads for heavy calculations. Somehow all these threads run on the same core at 100% load (the other 15 cores are nearly idle) so there is absolutely no benefit from the extra threads. In fact there is a slight slowdown as the threads get in each others way on the single core. How do I get them to run on separate cores (if possible)? Application is 64 bit. Can't change anything about the software except changing the threads setting. Is there some obscure Linux setting I can try to change? (I'm a True64 and Aix guy. I use Linux, but have no in depth knowledge of the process scheduling on Linux.)

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• Use synergy with Physical KVM

  - by Mr. Man

  I am using synergy on a Linux Mint computer as the server with a Mac as the client. I also have a physical KVM switch. The problem I have is that when ever I switch the physical KVM to my Mac, synergy stops working as in the keyboard and mouse don't work with the Mac. Thanks in advance! EDIT: here are some logs: From the Mint machine: INFO: synergys.cpp,1042: Synergy server 1.3.1 on Linux 2.6.31-14-generic #48-Ubuntu SMP Fri Oct 16 14:04:26 UTC 2009 i686 DEBUG: synergys.cpp,1051: opening configuration synergy.conf DEBUG: synergys.cpp,1062: configuration read successfully DEBUG: CXWindowsScreen.cpp,847: XOpenDisplay(:0.0) DEBUG: CXWindowsScreenSaver.cpp,339: xscreensaver window: 0x00000000 DEBUG: CXWindowsScreen.cpp,117: screen shape: 0,0 1024x768 DEBUG: CXWindowsScreen.cpp,118: window is 0x03800004 DEBUG: CScreen.cpp,38: opened display DEBUG: CXWindowsScreen.cpp,679: registered hotkey F12 (id=efc9 mask=0000) as id=1 NOTE: synergys.cpp,500: started server INFO: CServer.cpp,1141: screen ubuntu shape changed NOTE: CClientListener.cpp,127: accepted client connection DEBUG: CClientProxy1_0.cpp,404: received client marks-mac.local info shape=-1024,0 2304x800 NOTE: CServer.cpp,278: client mac has connected INFO: CServer.cpp,447: switch from ubuntu to mac at -1024,393 INFO: CScreen.cpp,116: leaving screen DEBUG: CXWindowsClipboard.cDEBUG: CXWindowsClipboard.cDEBUG: CXWindowsClipboard.cDEBUG: CXWindowsClipboard.cDEBUG: CXWindowsClipboard.cDEBUG: CXWinavDEBUG: CXWindowsClipboard.cDEBUG: CXWindowsClipboard.cDEBUG302)DEBUG: CXWindowsClipboard.cDEBUG: CXWindowsClipboard.cDE47DEBUG: CXWindowsClipboard.cDEBUG: CXWindowsrset=utf-8 (633), text/plain (462) DEBUG: CXWindowsClipboard.cpp,555: added fDEBUG: CXWindowsClipboard.cpp,555: added f DEBUG: CXWindCXWDEBUG: CXWindowsClipboard.cpp,555: added fDEBUG:SerDEBUG: CXWindowsClipboard.cpp,555: ed DEBUG: CXWindowsClipboard.cpp,555: added fDEBUG: CXWindowsClipboard.cpp,555owsClDEBUG: CXWindowsClipboard.cpp,555: 1DEBUG: CXWindowsClipboard.cpp,555: added fDEBUG: getDEBUG: CXWindowsClipboard.cpp,555: added f DEBUG: CXW8_STDEBUG: CXWindowsClipboard.cpp,555: added fDEBUG: CXWindowsClipboard.cpp,555: added fD textDEBUG: CXWindowsClipboard.cpp,555: added fDEBU DEBUG: CXWindowsClipboard.cpp,555: added fDEBUG: CXWindowsClipinDEBUG: CXWindowsClipboard.cpp,555:oardDEBUG: CXWindowsClipboard.cpp,555: added fDEBUG: CXWindowsClipboard.cpp,555: added fDEBUG: CXWindCXWDEBUG: CXWindowsClipboard.cpp,555: added fDEBUG:SerDEBUG: CXWindowsClipboard.cpp,555: ed DEBUG: CXWindowsClipboard.cpp,555: added fDEBUG: CXWindowsClipboard.cpp,555owsClDEBUG: CXWindowsClipboard.cpp,555: 1DEBUG: CXWindowsClipboard.cpp, s From the Mac: connecting to '192.168.3.5': 192.168.3.5:24800 connected to server entering screen leaving screen entering screen leaving screen stopped client

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• Selenium server causes crazy load on server - how to prevent?

  - by Eric

  I'm running this linux: Linux host.themepark.com 2.6.32-220.4.1.el6.x86_64 #1 SMP Tue Jan 24 02:13:44 GMT 2012 x86_64 x86_64 x86_64 GNU/Linux And I run the Selenium stand-alone server on my box with this command: java -jar /home/l/cron/selenium-server-standalone-2.24.1.jar > /logs/selenium.log 2>&1 & Here's the problem: as soon as I do that, the server load starts skyrocketing. I even went back and downloaded older versions of the Selenium server, but same results with 2.23.1, 2.23.0, and 2.19.0. Note that the server load starts going nuts before I issue ANY commands to Selenium or do anything else. All I'm doing is firing up the server, per the command above. This used to work perfectly on my server without causing massive server load, so something has changed, but I'm not sure what. My server is a managed VPS so I don't know if there is some kind of auto-update script that kicked in or what... but it's a problem. (Incidentally, even though the server load climbs like crazy, everything still works: after firing up Selenium, my server creates a screen with Xvfb so Firefox will be happy, then a PHP script talks to Selenium to do what it needs to do before shutting everything down. It takes a LONG time, and the load gets all the way up to 8 [!!!] before it is finished, which kills my web server and makes the main site horribly unresponsive... but it does get everything done.) Any suggestions for what is going on, why it's started doing this and/or, most importantly, how I can make Selenium not kill the server when it starts up... would be GREATLY appreciated!

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• Disabling CPU management

  - by Tiffany Walker

  If I add the following processor.max_cstate=0 to the kernel command line for boot up, does that disable all CPU power management and throttling? I also found: http://www.experts-exchange.com/OS/Linux/Administration/A_3492-Avoiding-CPU-speed-scaling-in-modern-Linux-distributions-Running-CPU-at-full-speed-Tips.html The link talks of Change CPU governor from 'ondemand' to 'performance' for all CPUs/cores and disabling kondemand from kernel. Server is for web hosting UPDATES: 2.6.32-379.1.1.lve1.1.7.6.el6.x86_64 #1 SMP Sat Aug 4 09:56:37 EDT 2012 x86_64 x86_64 x86_64 GNU/Linux . # dmidecode 2.11 SMBIOS 2.6 present. 74 structures occupying 2878 bytes. Table at 0x0009F000. Handle 0x0000, DMI type 0, 24 bytes BIOS Information Vendor: American Megatrends Inc. Version: 1.0c Release Date: 05/27/2010 Address: 0xF0000 Runtime Size: 64 kB ROM Size: 4096 kB Characteristics: ISA is supported PCI is supported PNP is supported BIOS is upgradeable BIOS shadowing is allowed ESCD support is available Boot from CD is supported Selectable boot is supported BIOS ROM is socketed EDD is supported 5.25"/1.2 MB floppy services are supported (int 13h) 3.5"/720 kB floppy services are supported (int 13h) 3.5"/2.88 MB floppy services are supported (int 13h) Print screen service is supported (int 5h) 8042 keyboard services are supported (int 9h) Serial services are supported (int 14h) Printer services are supported (int 17h) CGA/mono video services are supported (int 10h) ACPI is supported USB legacy is supported LS-120 boot is supported ATAPI Zip drive boot is supported BIOS boot specification is supported Targeted content distribution is supported BIOS Revision: 8.16 Handle 0x0001, DMI type 1, 27 bytes System Information Manufacturer: Supermicro Product Name: X8SIE Version: 0123456789 Serial Number: 0123456789 UUID: 49434D53-0200-9033-2500-33902500D52C Wake-up Type: Power Switch SKU Number: To Be Filled By O.E.M. Family: To Be Filled By O.E.M. Handle 0x0002, DMI type 2, 15 bytes Base Board Information Manufacturer: Supermicro Product Name: X8SIE Version: 0123456789 Serial Number: VM11S61561 Asset Tag: To Be Filled By O.E.M. Features: Board is a hosting board Board is replaceable Location In Chassis: To Be Filled By O.E.M. Chassis Handle: 0x0003 Type: Motherboard Contained Object Handles: 0 Handle 0x0003, DMI type 3, 21 bytes Chassis Information Manufacturer: Supermicro Type: Sealed-case PC Lock: Not Present Version: 0123456789 Serial Number: 0123456789 Asset Tag: To Be Filled By O.E.M. Boot-up State: Safe Power Supply State: Safe Thermal State: Safe Security Status: None OEM Information: 0x00000000 Height: Unspecified Number Of Power Cords: 1 Contained Elements: 0

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• Vserver: secure mails from a hacked webservice

  - by lukas

  I plan to rent and setup a vServer with Debian xor CentOS. I know from my host, that the vServers are virtualized with linux-vserver. Assume there is a lighthttpd and some mail transfer agent running and we have to assure that if the lighthttpd will be hacked, the stored e-mails are not readable easily. For me, this sounds impossible but may I missed something or at least you guys can validate the impossibility... :) I think basically there are three obvious approaches. The first is to encrypt all the data. Nevertheless, the server would have to store the key somewhere so an attacker (w|c)ould figure that out. Secondly one could isolate the critical services like lighthttpd. Since I am not allowed to do 'mknod' or remount /dev in a linux-vserver, it is not possible to setup a nested vServer with lxc or similar techniques. The last approach would be to do a chroot but I am not sure if it would provide enough security. Further I have not tried yet, if I am able to do a chroot in a linux-vserver...? Thanks in advance!

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• Kickstart installation from USB -- Kickstart location

  - by dooffas

  After managing to get a Fedora ISO to rebuild successfully (for a USB stick) after adding a kickstart file (http://serverfault.com/questions/548405/), I now have an issue with locating the kickstart file on the USB media. When this is done from a CDROM you can simply kickckstart by adding this parameter to boot: linux ks=cdrom This will kickstart (providing the kickstart file is named ks.cfg and is in the root of the disk). Now, obviously this will be different for the USB drive, so from my research, I assumed that this line would do the job: linux ks=hd:sdb1:/ks.cfg Evidently this does not work. I get an error informing me this drive is already mounted and cannot be remounted. EDIT: Actual error message: mount: /dev/sdb1 is already mounted or /run/install/tmpmnt0 busy Warning: Can't get kickstart from /dev/sdb1:/ks.cfg To test that the syntax was correct I placed the kickstart file on another USB stick and loaded the same command to grab ks.cfg from the new location: linux ks=hd:sdc1:/ks.cfg This does work (providing USB sticks are mounted in order, boot - sdb1, kickstart - sdc1). The install will kickstart and complete the install with no issue. Obviously having to use 2 pen drives is somewhat frustrating and unreliable. Is there a way around this?

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• Adding PHP to Apache

  - by user528451

  Where I work, we use ancient technology that belongs in a museum. Further I have to get everything done through system admins. They are telling me in order to get PHP, they will need to upgrade the operating system as well as the Apache version. lcas100[67]% uname -a Linux lcas100 2.6.9-11.ELsmp #1 SMP Fri May 20 18:26:27 EDT 2005 i686 i686 i386 GNU/Linux lcas100[68]% cat /etc/*-release LSB_VERSION="1.3" Red Hat Enterprise Linux AS release 4 (Nahant) lcas100[75]% /ots/apache/bin/httpd -v Server version: Apache/1.3.31 (Unix) Server built: Nov 3 2004 18:47:31 This doesn't make sense to me because apparently Apache 1.3.x supports PHP: http://php.net/manual/en/install.unix.apache.php Furthermore, we have another machine that runs PHP and is running the exact same OS and OS version. The reason I want it on the former machine is because it is mounted on a different file system. Lastly they tell me that all software the Apache webserver runs will need to be reinstalled/recompiled (assuming an Apache upgrade WAS needed). I am not even sure about this. Are they full of it? Thanks

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• Virtual Machines and Automatic Software Updates

  - by Zian Choy

  It's obvious that one's main computer should always be have all the latest security patches and most people don't blink an eye when Microsoft Update installs non-security updates. In the land of virtual machines, I've run into 2 problems with automatic updates: The virtual machines are only run when needed. Only Windows virtual machines seem to patch themselves. To elaborate on #1, I generally make a virtual machine with a purpose in mind. For example, when I needed an old copy of Internet Explorer to reproduce a bug in RSS Bandit, I had a Virtual PC named RSS Bandit. The machine only stayed running for a few minutes at a time. Consequently, there is no downtime for the machine to download updates at 3 AM. To elaborate on #2, I've noticed that if I haven't run a Windows virtual machine in a while, then the moment I log in, the computer frantically downloads updates and within seconds, if I click the Start button, there is a little orange shield next to the "Shutdown" button. However, I ran a freshly created Ubuntu VM for several hours today with hundreds of updates pending and it seemed to never download any of them or install any of them. Is there any reason to be concerned about running VMs with dozens of security holes? If I should be concerned, then is there any way to get Ubuntu to download and install updates rather than just advertising a long list of updates to download next century? I've already tried telling Ubuntu to automatically download and install updates.

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• what is uninstall procedure for software installed via "make install" on CentOS 6.2

  - by gkdsp

  I installed OCILIB on my CentOS 6.2 server some time ago, and now I want to install a newer version. The vendor requires an uninstall, but doesn't provide instructions. I'm guessing that's because it's trivial for people with a Linux background. http://orclib.sourceforge.net/doc/html/group_g_install.html If I installed this software using: step 1: # ./configure --with-oracle-headers-path=/usr/include/oracle/11.2/client64 --with-oracle-lib-path=/usr/lib/oracle/11.2/client64/lib step 2: # make step 3: # su root step 4: # make install step 5: # gcc -g -DOCI_IMPORT_LINKAGE -DOCI_CHARSET_ANSI -L/usr/lib/oracle/11.2/client64/lib -lclntsh -L/usr/local/lib -locilib conn.c -o conn How would I go about uninstalling this? I tried following this http://www.cyberciti.biz/faq/delete-uninstall-software-linux-commands/ but nothing was found on my disk using rpm -qa *oci* or yum list *oci*. Maybe since it wasn't installed with yum or rpm then I shouldn't expect either of these to find it. Are there generic instructions for uninstalling software on Linux that I could use, or do the instructions really depend on the specific software? Any help much appreciated.

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• nf_conntrack complaints in dmesg

  - by Alexander Gladysh

  While investigating complains on bad HTTP server performance, I've discovered these lines in dmesg of my Xen XCP host that contains a guest OS with said server: [11458852.811070] net_ratelimit: 321 callbacks suppressed [11458852.811075] nf_conntrack: table full, dropping packet. [11458852.819957] nf_conntrack: table full, dropping packet. [11458852.821083] nf_conntrack: table full, dropping packet. [11458852.822195] nf_conntrack: table full, dropping packet. [11458852.824987] nf_conntrack: table full, dropping packet. [11458852.825298] nf_conntrack: table full, dropping packet. [11458852.825891] nf_conntrack: table full, dropping packet. [11458852.826225] nf_conntrack: table full, dropping packet. [11458852.826234] nf_conntrack: table full, dropping packet. [11458852.826814] nf_conntrack: table full, dropping packet. Complains are repeated every five seconds (number of suppressed callbacks is different each time). What can these sympthoms mean? Is that bad? Any hints? (Note that the question is more narrow than "how to solve specific case of bad HTTP server performance", so I do not give more details on that.) Additional info: $ uname -a Linux MYHOST 3.2.0-24-generic #37-Ubuntu SMP Wed Apr 25 08:43:22 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux $ lsb_release -a No LSB modules are available. Distributor ID: Ubuntu Description: Ubuntu 12.04 LTS Release: 12.04 Codename: precise $ cat /proc/sys/net/netfilter/nf_conntrack_max 1548576 The server is under about 10M hits / day load.

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• ext4 filesystem corruption -- maybe hardware error?

  - by pts

  I'm getting these errors in dmesg after about half an hour after I turn on the computer: [ 1355.677957] EXT4-fs error (device sda2): htree_dirblock_to_tree: inode #1318420: (comm updatedb.mlocat) bad entry in directory: directory entry across blocks - block=5251700offset=0(0), inode=1802725748, rec_len=179136, name_len=32 [ 1355.677973] Aborting journal on device sda2-8. [ 1355.678101] EXT4-fs (sda2): Remounting filesystem read-only [ 1355.690144] EXT4-fs error (device sda2): htree_dirblock_to_tree: inode #1318416: (comm updatedb.mlocat) bad entry in directory: directory entry across blocks - block=5251699offset=0(0), inode=2194783952, rec_len=53280, name_len=152 [ 1356.864720] EXT4-fs error (device sda2): htree_dirblock_to_tree: inode #1312795: (comm updatedb.mlocat) bad entry in directory: directory entry across blocks - block=5251176offset=1460(13748), inode=1432317541, rec_len=208208, name_len=119 /dev/sda is an SSD, and it's using the noop scheduler. /etc/fstab entry: UUID=acb4eefa-48ff-4ee1-bb5f-2dccce7d011f / ext4 errors=remount-ro,noatime,discard,user_xattr 0 1 System information: $ cat /proc/mounts | grep /dev/sd /dev/sda1 /boot ext2 rw,noatime,errors=continue 0 0 $ cat /etc/lsb-release DISTRIB_ID=Ubuntu DISTRIB_RELEASE=10.04 DISTRIB_CODENAME=lucid DISTRIB_DESCRIPTION="Ubuntu 10.04.3 LTS" $ uname -a Linux leetpad 2.6.35-30-generic-pae #61~lucid1-Ubuntu SMP Thu Oct 13 21:14:29 UTC 2011 i686 GNU/Linux I've run memtest for 7 hours, it didn't found any memory errors. Any obvious ideas what can go wrong in this case? The most reasonable thing I can imagine is that the SSD is silently dropping some write requests, which eventually leads to an EXT4 filesystem inconsistency (but no disk I/O errors). How can this happen? Is there a relevant configuration option I should ensure to be set correctly? What tools should I use to diagnose the hardware failures? Would it be possible to diagnose the SSD failure without overwriting data?

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• NATing IPv4 while routing IPv6

  - by Hugo

  I've the following setup: client(s) <---> (eth0) router (eth1) <---> wan I have a static IPv4 address and a /48 IPv6 address block. I need to connect all the clients to (wan). Each client will have it's own public IPv6. Meanwhile, I need to NAT those same clients over to (wan). Everything IPv4-related and the NAT are working fine. The IPv6 communication to/from (eth0)<-(clients) works fine, as does the IPv6 communication from (eth1)<-(wan) works fine. To provide IPv6 to all my clients, I've thought of too choices: Having the router as a gateway, which different IP on each interface. This sounds like I need to tell my ISP to route the entire block through that single IP, so it's not really an option. Transparently pass IPv6 packets to/from eth0<-eth1, so all clients can communicate with the upstream gateway (I would actually have a switch here if it weren't for the need to remain IPv4 compatible). So, since I've opted for the second choice, I'm in doubt: How can I pass all IPv6 traffic from eth0 to eth1 transparently? What I need is a level 3 bridge, but linux's bridgeutils create a level 2 bridge (which would bridge ipv4 as well, and I can't have that). This is a DD-WRT device, but it's pretty much an embeded linux, so most suggestions that would work on linux are welcome. Thanks.

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• Redis 2.0.3 would not let go of deleted appendonly.aof file after BGREWRITEAOF

  - by Alexander Gladysh

  Ubuntu 10.04.2, Redis 2.0.3 (more details at the end of the question). My AOF file for Redis is getting too large, to the point where it soon would threaten to take whole free disk space on my small-HDD VPS box: $ df -h Filesystem Size Used Avail Use% Mounted on /dev/xvda 32G 24G 6.7G 78% / $ ls -la total 3866688 drwxr-xr-x 2 redis redis 4096 2011-03-02 00:11 . drwxr-xr-x 29 root root 4096 2011-01-24 15:58 .. -rw-r----- 1 redis redis 3923246988 2011-03-02 00:14 appendonly.aof -rw-rw---- 1 redis redis 32356467 2011-03-02 00:11 dump.rdb When I run BGREWRITEAOF, the AOF file shrinks, but disk space is not freed: $ ls -la total 95440 drwxr-xr-x 2 redis redis 4096 2011-03-02 00:17 . drwxr-xr-x 29 root root 4096 2011-01-24 15:58 .. -rw-rw---- 1 redis redis 65137639 2011-03-02 00:17 appendonly.aof -rw-rw---- 1 redis redis 32476167 2011-03-02 00:17 dump.rdb $ df -h Filesystem Size Used Avail Use% Mounted on /dev/xvda 32G 24G 6.7G 78% / Sure enough, Redis is still holding the deleted file: $ sudo lsof -p6916 COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME ... redis-ser 6916 redis 7r REG 202,0 3923957317 918129 /var/lib/redis/appendonly.aof (deleted) ... redis-ser 6916 redis 10w REG 202,0 66952615 917507 /var/lib/redis/appendonly.aof ... How can I workaround this issue? I can restart Redis this time, but I would really like to avoid doing this on a regular basis. Note that I can not upgrade to 2.2 (upgrade to 2.0.4 is feasible though). More information on my system: $ lsb_release -a No LSB modules are available. Distributor ID: Ubuntu Description: Ubuntu 10.04.2 LTS Release: 10.04 Codename: lucid $ uname -a Linux my.box 2.6.32.16-linode28 #1 SMP Sun Jul 25 21:32:42 UTC 2010 i686 GNU/Linux $ redis-cli info redis_version:2.0.3 redis_git_sha1:00000000 redis_git_dirty:0 arch_bits:32 multiplexing_api:epoll process_id:6916 uptime_in_seconds:632728 uptime_in_days:7 connected_clients:2 connected_slaves:0 blocked_clients:0 used_memory:65714632 used_memory_human:62.67M changes_since_last_save:8398 bgsave_in_progress:0 last_save_time:1299014574 bgrewriteaof_in_progress:0 total_connections_received:17 total_commands_processed:55748609 expired_keys:0 hash_max_zipmap_entries:64 hash_max_zipmap_value:512 pubsub_channels:0 pubsub_patterns:0 vm_enabled:0 role:master db0:keys=1,expires=0 db1:keys=18,expires=0

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• How to install subversion on 1&1 server with windows?

  - by Miles M.

  I would like to start using Unfuddle for my project on 1&1 server. I never used subversion and core control before. So, I read a lot of documentation about it but each time, I get lost at the very beginning : I've downloaded the latest version of subversion. But on every tutorial, the way to follow is different. First I sae, on a lot of tuts, that you have to enter command lines. Is that ONLY for Linux ? Like here : http://chwalisz.org/2007/08/05/subversion-on-11-shared-hosting/ I also find something completely different on some website, I think (correct me if I'm wrong) it is the Windows tuts, deeply different frm the linu one. So I found that : http://www.codinghorror.com/blog/2008/04/setting-up-subversion-on-windows.html http://geekswithblogs.net/emanish/archive/2006/06/14/81905.aspx http://better-scm.shlomifish.org/subversion/Svn-Win32-Inst-Guide.html And I don t understand : Do I still have to put the sibversion file on the server ? Do I have to install Apach ? where, on my computer or on my server ? I'm working ith WampServer so I thing I have already Apach installed right ? When they say it is for Windows, do they mean it is for windows servers or for your own OS ? 'Cause my servers are on linux. How could I install Subversion on a 1&1 linux server from my W7 OS computer ? Thanks, that's a lot of question but that realle messy in my mind, I can't find something clear ..

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• How to configure VirtualBox server for performance at home

  - by BluJai

  I currently have two physical Ubuntu Server 10.10 servers at home: one serves as our firewall/router/DHCP/VPN server and the other performs double-duty as a file server and a VirtualBox host for an Ubuntu Desktop 10.10 machine which I use from remote connections (via NoMachine) for many thin-client purposes which are irrelevant to my question. What I'd like to accomplish is to consolidate the two physical machines into one which is a dedicated VirtualBox host (most likely running Ubuntu Server 10.10). Note that I'd like to stick with VirtualBox (if possible) because I'm most comfortable with it and use it on a daily basis at both home and work. Specifically, I plan to have one VM set up as file server, another as the firewall/router/DHCP/VPN (or possibly split those a bit) and a third, which is the only current VM (already VirtualBox), which is the thin-client host. My question comes down to performance and/or recommendations about the file server VM. The file server hosts about 6 terabytes of data across 4 drives. What I'd like to do is use raw disk access from the VM directly to the existing disks. However, I'm curious what performance advantage/disadvantage that would have as compared to using shared folders from the VM host and basically just have the whole drive served as a shared folder to the VM which would then serve it to the other machines on the network. I don't know if virtual disks would even work in this scenario and I certainly wouldn't want a drive to be filled with just a single file which is 1.5 TB (disk image). To add understanding of context, but not to get additional advice, I want to virtualize these machines because I intend to regularly use the snapshot capabilities of VirtualBox for the system disks (which will be virtual drives) of the VMs and I have some physical space/power needs to address (as I mentioned, this is at home).

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• How to configure VirtualBox server for performance at home

  - by BluJai

  I currently have two physical Ubuntu Server 10.10 servers at home: one serves as our firewall/router/DHCP/VPN server and the other performs double-duty as a file server and a VirtualBox host for an Ubuntu Desktop 10.10 machine which I use from remote connections (via NoMachine) for many thin-client purposes which are irrelevant to my question. What I'd like to accomplish is to consolidate the two physical machines into one which is a dedicated VirtualBox host (most likely running Ubuntu Server 10.10). Note that I'd like to stick with VirtualBox (if possible) because I'm most comfortable with it and use it on a daily basis at both home and work. Specifically, I plan to have one VM set up as file server, another as the firewall/router/DHCP/VPN (or possibly split those a bit) and a third, which is the only current VM (already VirtualBox), which is the thin-client host. My question comes down to performance and/or recommendations about the file server VM. The file server hosts about 6 terabytes of data across 4 drives. What I'd like to do is use raw disk access from the VM directly to the existing disks. However, I'm curious what performance advantage/disadvantage that would have as compared to using shared folders from the VM host and basically just have the whole drive served as a shared folder to the VM which would then serve it to the other machines on the network. I don't know if virtual disks would even work in this scenario and I certainly wouldn't want a drive to be filled with just a single file which is 1.5 TB (disk image). To add understanding of context, but not to get additional advice, I want to virtualize these machines because I intend to regularly use the snapshot capabilities of VirtualBox for the system disks (which will be virtual drives) of the VMs and I have some physical space/power needs to address (as I mentioned, this is at home).

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