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• Kernel Panic on VMware Workstation 7.1.3

  - by i.h4d35

  I've been trying to install either Arch Linux or Fedora 17 on VMWare Workstation (7.1.3). After I point to the right ISO image, I get the following error: Booting the kernel PANIC: early exception 0d rip:ffffffff81042dc4 error 0 cr2 0 I am trying to install it on a machine which has a 3rd generation i5 processor. After checking A VMWare panic early exception fix for ivy bridge i3, i5, i7, I tried to turn off the nosmep acpi. This is around, I get the same error but at a different address. Apparently, others have faced this issue before. Thanks in advance.

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• Can't install kernel-uek-headers for currently running kernel

  - by haydenc2

  I have just created a VM in VMWare and installed a minimal install of Oracle Enterprise Linux 6.3. # cat /etc/oracle-release Oracle Linux Server release 6.3 It is running with the UEK kernel. # uname -r 2.6.39-200.24.1.el6uek.x86_64 When I try and install VMWare Tools, I get the following error. Searching for a valid kernel header path... The path "" is not a valid path to the 2.6.39-200.24.1.el6uek.x86_64 kernel headers. Would you like to change it? [yes] I have version 2.6.39 of the UEK installed, but the kernel-uek-headers are only 2.6.32. # yum list kernel-uek Installed Packages kernel-uek.x86_64 2.6.39-200.24.1.el6uek @anaconda-UEK2/6.3 kernel-uek.x86_64 2.6.39-200.29.3.el6uek @ol6_UEK_latest # yum list kernel-uek-headers Installed Packages kernel-uek-headers.x86_64 2.6.32-300.32.2.el6uek @ol6_latest And it appears that the headers for 2.6.39 aren't there. # yum list kernel-uek-headers --showduplicates Installed Packages kernel-uek-headers.x86_64 2.6.32-300.32.2.el6uek @ol6_latest Available Packages kernel-uek-headers.x86_64 2.6.32-100.28.5.el6 ol6_latest kernel-uek-headers.x86_64 2.6.32-100.28.9.el6 ol6_latest kernel-uek-headers.x86_64 2.6.32-100.28.11.el6 ol6_latest kernel-uek-headers.x86_64 2.6.32-100.28.15.el6 ol6_latest kernel-uek-headers.x86_64 2.6.32-100.28.17.el6 ol6_latest kernel-uek-headers.x86_64 2.6.32-100.34.1.el6uek ol6_latest kernel-uek-headers.x86_64 2.6.32-100.35.1.el6uek ol6_latest kernel-uek-headers.x86_64 2.6.32-100.36.1.el6uek ol6_latest kernel-uek-headers.x86_64 2.6.32-100.37.1.el6uek ol6_latest kernel-uek-headers.x86_64 2.6.32-200.16.1.el6uek ol6_latest kernel-uek-headers.x86_64 2.6.32-200.19.1.el6uek ol6_latest kernel-uek-headers.x86_64 2.6.32-200.20.1.el6uek ol6_latest kernel-uek-headers.x86_64 2.6.32-200.23.1.el6uek ol6_latest kernel-uek-headers.x86_64 2.6.32-300.3.1.el6uek ol6_latest kernel-uek-headers.x86_64 2.6.32-300.4.1.el6uek ol6_latest kernel-uek-headers.x86_64 2.6.32-300.7.1.el6uek ol6_latest kernel-uek-headers.x86_64 2.6.32-300.11.1.el6uek ol6_latest kernel-uek-headers.x86_64 2.6.32-300.20.1.el6uek ol6_latest kernel-uek-headers.x86_64 2.6.32-300.21.1.el6uek ol6_latest kernel-uek-headers.x86_64 2.6.32-300.24.1.el6uek ol6_latest kernel-uek-headers.x86_64 2.6.32-300.25.1.el6uek ol6_latest kernel-uek-headers.x86_64 2.6.32-300.27.1.el6uek ol6_latest kernel-uek-headers.x86_64 2.6.32-300.29.1.el6uek ol6_latest kernel-uek-headers.x86_64 2.6.32-300.29.2.el6uek ol6_latest kernel-uek-headers.x86_64 2.6.32-300.32.1.el6uek ol6_latest kernel-uek-headers.x86_64 2.6.32-300.32.2.el6uek ol6_latest The kernel for 2.6.32 is there. # yum list kernel-uek --showduplicates Installed Packages kernel-uek.x86_64 2.6.39-200.24.1.el6uek @anaconda-UEK2/6.3 kernel-uek.x86_64 2.6.39-200.29.3.el6uek @ol6_UEK_latest Available Packages kernel-uek.x86_64 2.6.32-100.28.5.el6 ol6_latest kernel-uek.x86_64 2.6.32-100.28.9.el6 ol6_latest kernel-uek.x86_64 2.6.32-100.28.11.el6 ol6_latest kernel-uek.x86_64 2.6.32-100.28.15.el6 ol6_latest kernel-uek.x86_64 2.6.32-100.28.17.el6 ol6_latest kernel-uek.x86_64 2.6.32-100.34.1.el6uek ol6_latest kernel-uek.x86_64 2.6.32-100.35.1.el6uek ol6_latest kernel-uek.x86_64 2.6.32-100.36.1.el6uek ol6_latest kernel-uek.x86_64 2.6.32-100.37.1.el6uek ol6_latest kernel-uek.x86_64 2.6.32-200.16.1.el6uek ol6_latest kernel-uek.x86_64 2.6.32-200.19.1.el6uek ol6_latest kernel-uek.x86_64 2.6.32-200.20.1.el6uek ol6_latest kernel-uek.x86_64 2.6.32-200.23.1.el6uek ol6_latest kernel-uek.x86_64 2.6.32-300.3.1.el6uek ol6_latest kernel-uek.x86_64 2.6.32-300.4.1.el6uek ol6_latest kernel-uek.x86_64 2.6.32-300.7.1.el6uek ol6_latest kernel-uek.x86_64 2.6.32-300.11.1.el6uek ol6_latest kernel-uek.x86_64 2.6.32-300.20.1.el6uek ol6_latest kernel-uek.x86_64 2.6.32-300.21.1.el6uek ol6_latest kernel-uek.x86_64 2.6.32-300.24.1.el6uek ol6_latest kernel-uek.x86_64 2.6.32-300.25.1.el6uek ol6_latest kernel-uek.x86_64 2.6.32-300.27.1.el6uek ol6_latest kernel-uek.x86_64 2.6.32-300.29.1.el6uek ol6_latest kernel-uek.x86_64 2.6.32-300.29.2.el6uek ol6_latest kernel-uek.x86_64 2.6.32-300.32.1.el6uek ol6_latest kernel-uek.x86_64 2.6.32-300.32.2.el6uek ol6_latest kernel-uek.x86_64 2.6.39-100.5.1.el6uek ol6_UEK_latest kernel-uek.x86_64 2.6.39-100.6.1.el6uek ol6_UEK_latest kernel-uek.x86_64 2.6.39-100.7.1.el6uek ol6_UEK_latest kernel-uek.x86_64 2.6.39-100.10.1.el6uek ol6_UEK_latest kernel-uek.x86_64 2.6.39-200.24.1.el6uek ol6_UEK_latest kernel-uek.x86_64 2.6.39-200.29.1.el6uek ol6_UEK_latest kernel-uek.x86_64 2.6.39-200.29.2.el6uek ol6_UEK_latest kernel-uek.x86_64 2.6.39-200.29.3.el6uek ol6_UEK_latest Should I downgrade the kernel to 2.6.32 so I can install VMWare tools? Is there another way to get the kernel-uek-headers package for the 2.6.39 UEK?

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• LightDM will not start after stopping it

  - by Sweeters

  I am running Ubuntu 11.10 "Oneiric Ocelot", and in trying to install the nvidia CUDA developer drivers I switched to a virtual terminal (Ctrl-Alt-F5) and stopped lightdm (installation required that no X server instance be running) through sudo service lightdm stop. Re-starting lightdm with sudo service lightdm start did not work: A couple of * Starting [...] lines where displayed, but the process hanged. (I do not remember at which point, but I think it was * Starting System V runlevel compatibility. I manually rebooted my laptop, and ever since booting seems to hang, usually around the * Starting anac(h)ronistic cron [OK] log line (not consistently at that point, though). From that point on, I seem to be able to interact with my system only through a tty session (Ctrl-Alt-F1). I've tried purging and reinstalling both lightdm and gdm, as well as selecting both as the default display managers (through sudo dpkg-reconfigure [lightdm / gdm] or by manually editing /etc/X11/default-display-manager) through both apt-get and aptitude (that shouldn't make a difference anyway) after updating the packages, but the problem persists. Some of the responses I'm getting are the following: After running sudo dpkg-reconfigure lightdm (but not ... gdm) I get the following message: dpkg-maintscript-helper:warning: environment variable DPKG_MATINSCRIPT_NAME missing dpkg-maintscript-helper:warning: environment variable DPKG_MATINSCRIPT_PACKAGE missing After trying sudo service lightdm start or sudo start lightdm I get to see the boot loading screen again but nothing changes. If I go back to the tty shell I see lightdm start/running, process <num> but ps -e | grep lightdm gives no output. After trying sudo service gdm start or sudo starg gdm I get the gdm start/running, process <num> message, and gdm-binary is supposedly an active process, but all that happens is that the screen blinks a couple of times and nothing else. Other candidate solutions that I'd found on the web included running startx but when I try that I get an error output [...] Fatal server error: no screens found [...]. Moreover, I made sure that lightdm-gtk-greeter is installed but that did not help either. Please excuse my not including complete outputs/logs; I am writing this post from another computer and it's hard to manually copy the complete logs. Also, I've seen several posts that had to do with similar problems, but either there was no fix, or the one suggested did not work for me. In closing: Please help! I very much hope to avoid re-installing Ubuntu from scratch! :) Alex @mosi I did not manage to fix the NVIDIA kernel driver as per your instructions. I should perhaps mention that I'm on a Dell XPS15 laptop with an NVIDIA Optimus graphics card, and that I have bumblebee installed (which installs nvidia drivers during its installation, I believe). Issuing the mentioned commands I get the following: ~$uname -r 3.0.0-12-generic ~$lsmod | grep -i nvidia nvidia 11713772 0 ~$dmesg | grep -i nvidia [ 8.980041] nvidia: module license 'NVIDIA' taints kernel. [ 9.354860] nvidia 0000:01:00.0: power state changed by ACPI to D0 [ 9.354864] nvidia 0000:01:00.0: power state changed by ACPI to D0 [ 9.354868] nvidia 0000:01:00.0: enabling device (0006 -> 0007) [ 9.354873] nvidia 0000:01:00.0: PCI INT A -> GSI 16 (level, low) -> IRQ 16 [ 9.354879] nvidia 0000:01:00.0: setting latency timer to 64 [ 9.355052] NVRM: loading NVIDIA UNIX x86_64 Kernel Module 280.13 Wed Jul 27 16:53:56 PDT 2011 Also, running aptitude search nvidia gives me the following: p nvidia-173 - NVIDIA binary Xorg driver, kernel module a p nvidia-173-dev - NVIDIA binary Xorg driver development file p nvidia-173-updates - NVIDIA binary Xorg driver, kernel module a p nvidia-173-updates-dev - NVIDIA binary Xorg driver development file p nvidia-96 - NVIDIA binary Xorg driver, kernel module a p nvidia-96-dev - NVIDIA binary Xorg driver development file p nvidia-96-updates - NVIDIA binary Xorg driver, kernel module a p nvidia-96-updates-dev - NVIDIA binary Xorg driver development file p nvidia-cg-toolkit - Cg Toolkit - GPU Shader Authoring Language p nvidia-common - Find obsolete NVIDIA drivers i nvidia-current - NVIDIA binary Xorg driver, kernel module a p nvidia-current-dev - NVIDIA binary Xorg driver development file c nvidia-current-updates - NVIDIA binary Xorg driver, kernel module a p nvidia-current-updates-dev - NVIDIA binary Xorg driver development file i nvidia-settings - Tool of configuring the NVIDIA graphics dr p nvidia-settings-updates - Tool of configuring the NVIDIA graphics dr v nvidia-va-driver - v nvidia-va-driver - I've tried manually installing (sudo aptitude install <package>) packages nvidia-common and nvidia-settings-updates but to no avail. For example, sudo aptitude install nvidia-settings-updates returns the following log: Reading package lists... Building dependency tree... Reading state information... Reading extended state information... Initializing package states... Writing extended state information... No packages will be installed, upgraded, or removed. 0 packages upgraded, 0 newly installed, 0 to remove and 83 not upgraded. Need to get 0 B of archives. After unpacking 0 B will be used. Writing extended state information... Reading package lists... Building dependency tree... Reading state information... Reading extended state information... Initializing package states... Writing extended state information... The same happens with the Linux headers (i.e. I cannot seem to be able to install linux-headers-3.0.0-12-generic). The output of aptitude search linux-headers is as follows: v linux-headers - v linux-headers - v linux-headers-2.6 - i linux-headers-2.6.38-11 - Header files related to Linux kernel versi i linux-headers-2.6.38-11-generic - Linux kernel headers for version 2.6.38 on i A linux-headers-2.6.38-8 - Header files related to Linux kernel versi i A linux-headers-2.6.38-8-generic - Linux kernel headers for version 2.6.38 on v linux-headers-3 - v linux-headers-3.0 - v linux-headers-3.0 - i A linux-headers-3.0.0-12 - Header files related to Linux kernel versi p linux-headers-3.0.0-12-generic - Linux kernel headers for version 3.0.0 on p linux-headers-3.0.0-12-generic- - Linux kernel headers for version 3.0.0 on p linux-headers-3.0.0-12-server - Linux kernel headers for version 3.0.0 on p linux-headers-3.0.0-12-virtual - Linux kernel headers for version 3.0.0 on p linux-headers-generic - Generic Linux kernel headers p linux-headers-generic-pae - Generic Linux kernel headers v linux-headers-lbm - v linux-headers-lbm - v linux-headers-lbm-2.6 - v linux-headers-lbm-2.6 - p linux-headers-lbm-3.0.0-12-gene - Header files related to linux-backports-mo p linux-headers-lbm-3.0.0-12-gene - Header files related to linux-backports-mo p linux-headers-lbm-3.0.0-12-serv - Header files related to linux-backports-mo p linux-headers-server - Linux kernel headers on Server Equipment. p linux-headers-virtual - Linux kernel headers for virtual machines @heartsmagic I did try purging and reinstalling any nvidia driver packages, but it did not seem to make a difference, My xorg.conf file contains the following: # nvidia-xconfig: X configuration file generated by nvidia-xconfig # nvidia-xconfig: version 280.13 ([email protected]) Wed Jul 27 17:15:58 PDT 2011 Section "ServerLayout" Identifier "Layout0" Screen 0 "Screen0" 0 0 InputDevice "Keyboard0" "CoreKeyboard" InputDevice "Mouse0" "CorePointer" EndSection Section "Files" EndSection Section "InputDevice" # generated from default Identifier "Mouse0" Driver "mouse" Option "Protocol" "auto" Option "Device" "/dev/psaux" Option "Emulate3Buttons" "no" Option "ZAxisMapping" "4 5" EndSection Section "InputDevice" # generated from default Identifier "Keyboard0" Driver "kbd" EndSection Section "Monitor" Identifier "Monitor0" VendorName "Unknown" ModelName "Unknown" HorizSync 28.0 - 33.0 VertRefresh 43.0 - 72.0 Option "DPMS" EndSection Section "Device" Identifier "Device0" Driver "nvidia" VendorName "NVIDIA Corporation" EndSection Section "Screen" Identifier "Screen0" Device "Device0" Monitor "Monitor0" DefaultDepth 24 SubSection "Display" Depth 24 EndSubSection EndSection

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• How do I fix dependency problems with the kernel in apt?

  - by Jon

  When trying to install new packages, either manually or with muon, I get these errors: jon@jon-desktop:~/Apps/mendeleydesktop-1.5-dev4-linux-x86_64/bin$ sudo apt-get install kupfer [sudo] password for jon: Reading package lists... Done Building dependency tree Reading state information... Done You might want to run 'apt-get -f install' to correct these: The following packages have unmet dependencies: kupfer : Depends: python-keybinder but it is not going to be installed Recommends: python-wnck but it is not going to be installed linux-headers-generic : Depends: linux-headers-3.2.0-20-generic but it is not installable linux-image-generic : Depends: linux-image-3.2.0-20-generic but it is not installable E: Unmet dependencies. Try 'apt-get -f install' with no packages (or specify a solution). jon@jon-desktop:~/Apps/mendeleydesktop-1.5-dev4-linux-x86_64/bin$ sudo apt-get -f install Reading package lists... Done Building dependency tree Reading state information... Done Correcting dependencies... Done The following extra packages will be installed: linux-generic linux-headers-generic linux-image-generic The following packages will be upgraded: linux-generic linux-headers-generic linux-image-generic 3 upgraded, 0 newly installed, 0 to remove and 2 not upgraded. 3 not fully installed or removed. Need to get 0 B/6,658 B of archives. After this operation, 0 B of additional disk space will be used. Do you want to continue [Y/n]? dpkg: dependency problems prevent configuration of linux-image-generic: linux-image-generic depends on linux-image-3.2.0-20-generic; however: Package linux-image-3.2.0-20-generic is not installed. dpkg: error processing linux-image-generic (--configure): dependency problems - leaving unconfigured No apport report written because the error message indicates its a followup error from a previous failure. dpkg: dependency problems prevent configuration of linux-generic: linux-generic depends on linux-image-generic (= 3.2.0.20.22); however: Package linux-image-generic is not configured yet. dpkg: error processing linux-generic (--configure): dependency problems - leaving unconfigured No apport report written because the error message indicates its a followup error from a previous failure. dpkg: dependency problems prevent configuration of linux-headers-generic: linux-headers-generic depends on linux-headers-3.2.0-20-generic; however: Package linux-headers-3.2.0-20-generic is not installed. dpkg: error processing linux-headers-generic (--configure): dependency problems - leaving unconfigured No apport report written because the error message indicates its a followup error from a previous failure. Errors were encountered while processing: linux-image-generic linux-generic linux-headers-generic E: Sub-process /usr/bin/dpkg returned an error code (1) As indicated above, I ran sudo apt-get -f install but it still tells me there are dependency issues.

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• Running a small IPTV station

  - by nixterrimus

  I'm looking to run an iptv station for my dorm. I know I can serve multicast so that's not a problem. The station will serve out podcasts and other cc licensed content. The target endpoint is xbmc- a media center. So far I know that I need to serve an rtp stream over udp that's streaming an mpeg-4 avc main or high profile with aac ( or ac3 ?) audio. I've had some luck using vlc with vlm to stream but it seems limited. What are my other options?  Everything has to run on Linux- hopefully open source. How can I use playlists and not live streams? What are my software options?

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• Adding new users

  - by user36651

  I have an FTP server that is running Fedora Core release 6 (Zod) the problem is I need to create new users and I have root access saved in WinSCP, so I can run useradd or adduser via the fake terminal, but every time I try to use passwd <username> it crashes on me and won't allow me to change or add a password. my questions are this: --Is there a place the adduser script stores the default passwords? or what is the default? --Is there another way I can set passwords for new users? I don't want to change the root pass because EVERYONE has root access and it's saved in WinSCP (I'm sure you see the problem here...) I want to create User accounts for each user instead of giving them all blatant root access. the goal here is to gradually migrate everyone over to their new account and then change the root p/w. Any suggestions would be greatly appreciated.

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• Socks5 proxy "Dante" leaves many child processes stuck in FIN_WAIT2 / CLOSE_WAIT state

  - by Asad R.

  I'm running dante v1.2.1 as a SOCKS proxy server. The proxy works fine but at the end of the day there are around 40-50 or more child processes of sockd running even though there are no active connections. lsof shows that the child processes all have sockets in the CLOSE_WAIT and FIN_WAIT2 state. These child processes stay in this state unless I manually killall/restart the daemon. I'm running Gentoo Linux on a 2.6.24-23-xen kernel. I recently upgraded from dante v1.1.19-r4 which was giving me the exact same problem. Is this a configuration issue with Dante, my system, or is it a coding issue in the dante code?

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• Oracle Keeps Growing Partner Certifications with Addition of McAfee

  - by Ted Davis

  Viruses stink. Whether it’s the common cold virus, Goatpox virus – yes it exists -- or a computer virus, you name it, viruses stink. When it comes to our computer server infrastructure we all want to make sure our servers are secure from any malware out there. Additionally, installation of anti-virus software is a requirement by many governments and for many enterprises both large and small. Because of the growth of Oracle Linux in their customer base, McAfee recently certified their “McAfee VirusScan Enterprise for Linux” on Oracle Linux.  It delivers always-on, real-time anti-virus protection for Linux environments. Its unique, Linux-based on-access scanner constantly monitors the system for potential attacks. While there have been few viruses found on Linux, you can now feel secure running Oracle Linux in your infrastructure with McAfee on top. We are happy to introduce McAfee into the Oracle Linux family of certified applications. 

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• HTG Explains: Which Linux File System Should You Choose?

  - by Justin Garrison

  File systems are one of the layers beneath your operating system that you don’t think about—unless you’re faced with the plethora of options in Linux. Here’s how to make an educated decision on which file system to use. The landscape of the Linux file system support is drastically different from Windows and OS X. In Windows and OS X you can find software that will add support for non-standard file systems, but both operating systems can only be installed on their native file system and third party support is added after the fact. Linux on the other hand has a vast array of supported file systems built into the kernel. But how are you supposed to know which file system to pick when installing? We will take a look at some of the most popular choices available and give you use cases to consider—the choice is ultimately up to you based on your needs. Latest Features How-To Geek ETC The 50 Best Registry Hacks that Make Windows Better The How-To Geek Holiday Gift Guide (Geeky Stuff We Like) LCD? LED? Plasma? The How-To Geek Guide to HDTV Technology The How-To Geek Guide to Learning Photoshop, Part 8: Filters Improve Digital Photography by Calibrating Your Monitor Our Favorite Tech: What We’re Thankful For at How-To Geek Settle into Orbit with the Voyage Theme for Chrome and Iron Awesome Safari Compass Icons Set Escape from the Exploding Planet Wallpaper Move Your Tumblr Blog to WordPress Pytask is an Easy to Use To-Do List Manager for Your Ubuntu System Snowy Christmas House Personas Theme for Firefox

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• How can I see logs in a server after a kernel panic hang?

  - by Low Kian Seong

  I am running a production gentoo Linux machine, and recently there was a situation where the server hung in my co-located premises and when I got there I noticed that the server was hung on what appeared to be a kernel panic hang. I rebooted the machine with a hard reboot and was disappointed to find out that I could not find a shred of evidence anywhere on why the machine hung. Is it true that when I do a hard reboot the messages itself will get lost or is there a setting I can do somewhere say in syslog-ng or maybe in sysctl to at least preserve the error log so that I can prevent such mishaps from happening in the future ? I am running a 2.6.x kernel by the way. Thanks in advance.

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• client subscribed to a multicast group not receiving data

  - by Abruzzo Forte e Gentile

  I have a network that was setup for multicast traffic IN Machine A there is a server application generating multi-cast traffic. I have also different clients subscribing to that mulicast traffic -some client are in the same machine A -other clients are in machine B,C,D # Address I am using IP : 239.193.0.21 PORT: 20401 I don't know why but the client in machine A , even if they join the group, don't receive any data while (and this is the funny part) machine B,C and D receive everything. Checking with Wirshark I can see that the UDP traffic flow is there in Machine A. I am using LInux/Red-Hat Enterprise 6.2 What should I look at? Any setting in the os? Firewall or what?

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• What is the best way to back up dedicated web server? (Amanda versus Rsync)

  - by Scott

  Hello everyone, I am trying to establish valid back ups for my web server. It is a linux box on CentOS. I have asked around and "rsync" was suggested by some of the server fault community. However, my coworker at work says that this is really only moving over the physical files and isn't really a usable "snapshot." He suggested using "amanda" and that this did full server snapshots that are more what I am accustomed to. I know at my company we have virtual machines that we take snapshots of and we can restore everything back to just as they were with little effort and little downtime. Is this possible with rsync? Or would I need to create a new server and then migrate the files back and do various configurations? I think I prefer being able to just reset everything to a point in time. Forgive my ignorance, Back ups are something that I have never really had to worry about before.

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• Is it worth moving from Microsoft tech to Linux, NodeJS & other open source frameworks to save money for a start-up?

  - by dormisher

  I am currently getting involved in a startup, I am the only developer involved at the moment, and the other guys are leaving all the tech decisions up to me at the moment. For my day job I work at a software house that uses Microsoft tech on a day to day basis, we utilise .NET, SqlServer, Windows Server etc. However, I realise that as a startup we need to keep costs down, and after having a brief look at the cost of hosting for Windows I was shocked to see some of the prices for a dedicated server. The cheapest I found was £100 a month. Also if the business needs to scale in the future and we end up needing multiple servers, we could end up shelling out £10's of £000's a year in SQL Server / Windows Server licenses etc. I then had a quick look at the price of Linux hosting for a dedicated server and saw the price was waaaaaay lower than windows hosting. One place was offering a machine with 2 cores for less than £20 a month. This got me thinking maybe the way to go is open source on Linux. As I write a lot of Javascript at work (I'm working on a single page backbone app at the moment), I thought maybe NodeJS and a web framework like Express would be cool to use. I then thought that instead of using SQL why not use an open source NoSQL database like MongoDB, which has great support on NodeJS? My only concern is that some of the work the application is going to do is going to be dynamically building images and various other image related stuff, i.e. stuff that is quite CPU heavy - so I'm thinking of maybe writing anything CPU heavy in C++ and consuming it as a module in Node. That's the background - but basically is Linux a good match for: Hosting a NodeJS/Express site? Compiling C++ node modules? Using a NoSQL DB like MongoDB? And is it a good idea to move to these unfamiliar technologies to save money?

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• Using iptables to block ALL outgoing traffic from one NIC?

  - by edanfalls

  Hi, I must pretty bad at Googling as this seems like a very basic question but I can't seem to find the answer anywhere... and man iptables is a very long read! I have two NICs - eth0 and eth1 - on a linux box and I want to block ALL outbound traffic (TCP and UDP across all ports) from one of the NICs, so that no traffic makes its way back up to the router. What is the command for this? I have only seen examples with specific ports. Thanks in advance.

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• Essential topics to be discussed in Linux 101

  - by zengr

  Hi, We are organizing a Linux 101 Workshop for undergrad and grad students. Can you share some ideas/topics that are must for people who are just starting with Linux. Preconditions: No knowledge of Linux OS, philosophy and technical aspects (kernel, shell, commands) Post conditions: A basic crash course of Linux which will give them a good start and answer some basic questions asked on it.

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• creating a .sh file programmatically under windows and running it on a linux system from cygwin

  - by user1296193

  i want to write program, in windows, which will write a .sh file, then connect to a linux machine via cygwin and ssh, and execute that .sh file. I've had to use dos2unix to convert .sh files that I created in windows to run under linux. Obviously if I am executing a script with ssh it will have to be linux formatted to work. so I need to know how to create a linux appropriate .sh file using c or openoffice basic or vBA. thanks!

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• Windows service porting to linux

  - by Sirish Kumar

  I am porting an application which runs as a background service in windows at startup, we are porting the application to linux(SUSE Enterprise server), I'am completely new to linux. Can somebody help me on how to proceed with this. Like Should I build the linux executable After builiding the binary, what changes should I make to linux startup files to run this executable How my service can register call back function to modify or change or send commands to my service while it is running

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• Linux - specific API reference

  - by Goofy

  Hello! Where can I find centralized and complete documentation aboput Linux - specific API? I'm preparing Linux port of my application and i want to use as much Linux - specific features as it's possible. So far I found that Linux provide epoll and inotify API, which are great news for me, because my program works as network server and monitor local file systems.

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• Linux Kernel - Red/Black Trees

  - by CodeRanger

  I'm trying to implement a red/black tree in Linux per task_struct using code from linux/rbtree.h. I can get a red/black tree inserting properly in a standalone space in the kernel such as a module but when I try to get the same code to function with the rb_root declared in either task_struct or task_struct-files_struct, I get a SEGFAULT everytime I try an insert. Here's some code: In task_struct I create a rb_root struct for my tree (not a pointer). In init_task.h, macro INIT_TASK(tsk), I set this equal to RB_ROOT. To do an insert, I use this code: rb_insert(&(current-fd_tree), &rbnode); This is where the issue occurs. My insert command is the standard insert that is documented in all RBTree documentation for the kernel: int my_insert(struct rb_root *root, struct mytype *data) { struct rb_node **new = &(root->rb_node), *parent = NULL; /* Figure out where to put new node */ while (*new) { struct mytype *this = container_of(*new, struct mytype, node); int result = strcmp(data->keystring, this->keystring); parent = *new; if (result < 0) new = &((*new)->rb_left); else if (result > 0) new = &((*new)->rb_right); else return FALSE; } /* Add new node and rebalance tree. */ rb_link_node(&data->node, parent, new); rb_insert_color(&data->node, root); return TRUE; } Is there something I'm missing? Some reason this would work fine if I made a tree root outside of task_struct? If I make rb_root inside of a module this insert works fine. But once I put the actual tree root in the task_struct or even in the task_struct-files_struct, I get a SEGFAULT. Can a root node not be added in these structs? Any tips are greatly appreciated. I've tried nearly everything I can think of.

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• Unexpected start of already-primary server processes when heartbeat on secondary is stopped.

  - by vorik

  Hi, I've got an active-passive Heartbeat cluster with Apache, MySQL, ActiveMQ and DRBD. Today, I wanted to perform hardware-maintenance on the secondary node (node04), so I stopped the heartbeat service before shutting it down. Then, the primary node (node03) received a shutdown notice from the secondary node (node04). This logging comes from the primary node: node03 heartbeat[4458]: 2010/03/08_08:52:56 info: Received shutdown notice from 'node04.companydomain.nl'. heartbeat[4458]: 2010/03/08_08:52:56 info: Resources being acquired from node04.companydomain.nl. harc[27522]: 2010/03/08_08:52:56 info: Running /etc/ha.d/rc.d/status status heartbeat[27523]: 2010/03/08_08:52:56 info: Local Resource acquisition completed. mach_down[27567]: 2010/03/08_08:52:56 info: /usr/share/heartbeat/mach_down: nice_failback: foreign resources acquired mach_down[27567]: 2010/03/08_08:52:56 info: mach_down takeover complete for node node04.companydomain.nl. heartbeat[4458]: 2010/03/08_08:52:56 info: mach_down takeover complete. harc[27620]: 2010/03/08_08:52:56 info: Running /etc/ha.d/rc.d/ip-request-resp ip-request-resp ip-request-resp[27620]: 2010/03/08_08:52:56 received ip-request-resp drbddisk OK yes ResourceManager[27645]: 2010/03/08_08:52:56 info: Acquiring resource group: node03.companydomain.nl drbddisk Filesystem::/dev/drbd0::/data::ext3 mysql apache::/etc/httpd/conf/httpd.conf LVSSyncDaemonSwap::master monitor activemq tivoli-cluster MailTo::[email protected]::DRBDFailureDrisAcc MailTo::[email protected]::DRBDFailureDrisAcc 1.2.3.212 ResourceManager[27645]: 2010/03/08_08:52:56 info: Running /etc/ha.d/resource.d/drbddisk start Filesystem[27700]: 2010/03/08_08:52:57 INFO: Running OK ResourceManager[27645]: 2010/03/08_08:52:57 info: Running /etc/ha.d/resource.d/mysql start mysql[27783]: 2010/03/08_08:52:57 Starting MySQL[ OK ] apache[27853]: 2010/03/08_08:52:57 INFO: Running OK ResourceManager[27645]: 2010/03/08_08:52:57 info: Running /etc/ha.d/resource.d/monitor start monitor[28160]: 2010/03/08_08:52:58 ResourceManager[27645]: 2010/03/08_08:52:58 info: Running /etc/ha.d/resource.d/activemq start activemq[28210]: 2010/03/08_08:52:58 Starting ActiveMQ Broker... ActiveMQ Broker is already running. ResourceManager[27645]: 2010/03/08_08:52:58 ERROR: Return code 1 from /etc/ha.d/resource.d/activemq ResourceManager[27645]: 2010/03/08_08:52:58 CRIT: Giving up resources due to failure of activemq ResourceManager[27645]: 2010/03/08_08:52:58 info: Releasing resource group: node03.companydomain.nl drbddisk Filesystem::/dev/drbd0::/data::ext3 mysql apache::/etc/httpd/conf/httpd.conf LVSSyncDaemonSwap::master monitor activemq tivoli-cluster MailTo::[email protected]::DRBDFailureDrisAcc MailTo::[email protected]::DRBDFailureDrisAcc 1.2.3.212 ResourceManager[27645]: 2010/03/08_08:52:58 info: Running /etc/ha.d/resource.d/IPaddr 1.2.3.212 stop IPaddr[28329]: 2010/03/08_08:52:58 INFO: ifconfig eth0:0 down IPaddr[28312]: 2010/03/08_08:52:58 INFO: Success ResourceManager[27645]: 2010/03/08_08:52:58 info: Running /etc/ha.d/resource.d/MailTo [email protected] DRBDFailureDrisAcc stop MailTo[28378]: 2010/03/08_08:52:58 INFO: Success ResourceManager[27645]: 2010/03/08_08:52:58 info: Running /etc/ha.d/resource.d/MailTo [email protected] DRBDFailureDrisAcc stop MailTo[28433]: 2010/03/08_08:52:58 INFO: Success ResourceManager[27645]: 2010/03/08_08:52:58 info: Running /etc/ha.d/resource.d/tivoli-cluster stop ResourceManager[27645]: 2010/03/08_08:52:58 info: Running /etc/ha.d/resource.d/activemq stop activemq[28503]: 2010/03/08_08:53:01 Stopping ActiveMQ Broker... Stopped ActiveMQ Broker. ResourceManager[27645]: 2010/03/08_08:53:01 info: Running /etc/ha.d/resource.d/monitor stop monitor[28681]: 2010/03/08_08:53:01 ResourceManager[27645]: 2010/03/08_08:53:01 info: Running /etc/ha.d/resource.d/LVSSyncDaemonSwap master stop LVSSyncDaemonSwap[28714]: 2010/03/08_08:53:02 info: ipvs_syncmaster down LVSSyncDaemonSwap[28714]: 2010/03/08_08:53:02 info: ipvs_syncbackup up LVSSyncDaemonSwap[28714]: 2010/03/08_08:53:02 info: ipvs_syncmaster released ResourceManager[27645]: 2010/03/08_08:53:02 info: Running /etc/ha.d/resource.d/apache /etc/httpd/conf/httpd.conf stop apache[28782]: 2010/03/08_08:53:03 INFO: Killing apache PID 18390 apache[28782]: 2010/03/08_08:53:03 INFO: apache stopped. apache[28771]: 2010/03/08_08:53:03 INFO: Success ResourceManager[27645]: 2010/03/08_08:53:03 info: Running /etc/ha.d/resource.d/mysql stop mysql[28851]: 2010/03/08_08:53:24 Shutting down MySQL.....................[ OK ] ResourceManager[27645]: 2010/03/08_08:53:24 info: Running /etc/ha.d/resource.d/Filesystem /dev/drbd0 /data ext3 stop Filesystem[29010]: 2010/03/08_08:53:25 INFO: Running stop for /dev/drbd0 on /data Filesystem[29010]: 2010/03/08_08:53:25 INFO: Trying to unmount /data Filesystem[29010]: 2010/03/08_08:53:25 ERROR: Couldn't unmount /data; trying cleanup with SIGTERM Filesystem[29010]: 2010/03/08_08:53:25 INFO: Some processes on /data were signalled Filesystem[29010]: 2010/03/08_08:53:27 INFO: unmounted /data successfully Filesystem[28999]: 2010/03/08_08:53:27 INFO: Success ResourceManager[27645]: 2010/03/08_08:53:27 info: Running /etc/ha.d/resource.d/drbddisk stop heartbeat[4458]: 2010/03/08_08:53:29 WARN: node node04.companydomain.nl: is dead heartbeat[4458]: 2010/03/08_08:53:29 info: Dead node node04.companydomain.nl gave up resources. heartbeat[4458]: 2010/03/08_08:53:29 info: Link node04.companydomain.nl:eth0 dead. heartbeat[4458]: 2010/03/08_08:53:29 info: Link node04.companydomain.nl:eth1 dead. hb_standby[29193]: 2010/03/08_08:53:57 Going standby [foreign]. heartbeat[4458]: 2010/03/08_08:53:57 info: node03.companydomain.nl wants to go standby [foreign] Soo... What just happened here??? Heartbeat on node04 stopped and told node03, which was the active node at the time. Somehow, node03 decided to start the cluster processes that were already running. (For the processes that are not critical, I always return a 0 from the startupscript so it does not stops the entire cluster when a non-essential part fails.) When starting ActiveMQ, it returns status 1 because it is already running. This fails the node and shuts everything down. As heartbeat is not running on the secondary node, it cannot failover to there. When I tried to run ha_takeover to restart the resources, absolutely nothing happened. Only after I restarted heartbeat on the primary node the resources could be started (after a delay of 2 minutes). These are my questions: Why does heartbeat on the primary node try to start the cluster processes again? Why did ha_takeover not work? What can I do to prevent this from happening? Server configuration: DRBD: version: 8.3.7 (api:88/proto:86-91) GIT-hash: ea9e28dbff98e331a62bcbcc63a6135808fe2917 build by [email protected], 2010-01-20 09:14:48 0: cs:Connected ro:Secondary/Primary ds:UpToDate/UpToDate B r---- ns:0 nr:6459432 dw:6459432 dr:0 al:0 bm:301 lo:0 pe:0 ua:0 ap:0 ep:1 wo:d oos:0 uname -a Linux node04 2.6.18-164.11.1.el5 #1 SMP Wed Jan 6 13:26:04 EST 2010 x86_64 x86_64 x86_64 GNU/Linux haresources node03.companydomain.nl \ drbddisk \ Filesystem::/dev/drbd0::/data::ext3 \ mysql \ apache::/etc/httpd/conf/httpd.conf \ LVSSyncDaemonSwap::master \ monitor \ activemq \ tivoli-cluster \ MailTo::[email protected]::DRBDFailureDrisAcc \ MailTo::[email protected]::DRBDFailureDrisAcc \ 1.2.3.212 ha.cf debugfile /var/log/ha-debug logfile /var/log/ha-log keepalive 500ms deadtime 30 warntime 10 initdead 120 udpport 694 mcast eth0 225.0.0.3 694 1 0 mcast eth1 225.0.0.4 694 1 0 auto_failback off node node03.companydomain.nl node node04.companydomain.nl respawn hacluster /usr/lib64/heartbeat/dopd apiauth dopd gid=haclient uid=hacluster Thank you very much in advance, Ger Apeldoorn

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• Trying and expand the contrib.auth.user model and add a "relatipnships" manage

  - by dotty

  I have the following model setup. from django.db import models from django.contrib.auth.models import User class SomeManager(models.Manager): def friends(self): # return friends bla bla bla class Relationship(models.Model): """(Relationship description)""" from_user = models.ForeignKey(User, related_name='from_user') to_user = models.ForeignKey(User, related_name='to_user') has_requested_friendship = models.BooleanField(default=True) is_friend = models.BooleanField(default=False) objects = SomeManager() relationships = models.ManyToManyField(User, through=Relationship, symmetrical=False) relationships.contribute_to_class(User, 'relationships') Here i take the User object and use contribute_to_class to add 'relationships' to the User object. The relationship show up, but if call User.relationships.friends it should run the friends() method, but its failing. Any ideas how i would do this? Thanks

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• OpenNebula: [HostPoolInfo] User couldn't be authenticated, aborting call

  - by ulf

  I installed OpenNebula 3.2.1 following the guide found under http://opennebula.org/documentation:rel3.2:ignc on a Debian 6.0.4 machine. Everything seemed fine until trying to execute the command onevm list Then I always get this: oneadmin@opennebula-master:~$ onevm list [VirtualMachinePoolInfo] User couldn't be authenticated, aborting call. The file one_auth exists. I even gave the oneadmin user a password although it doesn't seem to be required according to the guide. I copied the password hash from /etc/shadow to the one_auth file. Still no success. Any ideas are appreciated.

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• Windows Clients: Windows or Linux Domain Controller?

  - by Ramon Marco Navarro

  I'm planning to set up a domain controller for our small computer laboratory. I'm a little confused as to what operating system to use for our domain controller. What's in the lab: The lab has 25 units running a mix of Windows 7 and Windows XP. The domain controller will only have 2GB of RAM running a C2D E7200. (Is this enough?) What we want: The Domain Controller will also be running a git server. The Domain Controller will also be used as a general development machine (mostly Java, PHP). A way to centralize the updates for the windows clients, so that they won't have to download the same patches from the remote site. The machines would just query them from the local domain controller and get the updates from there. Our head recommended that I virtualize a Windows Server 2008 system under a Linux host and use the former as a domain controller and the latter for development or the other way around. A comparison of the advantages and disadvantages of using a Linux distribution or Windows Server 2008 in this situation would also be appreciated. As you may have noticed by now, I'm kinda new to setting up a domain so I hope you guys will be able to help me. Thank you.

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• Windows or Linux for VPN-VPN Bridge

  - by James

  I have the following network layout: Network1 ----VPN1-----Network2----VPN2----Network3 I can administer everything in Network1 only and my goal is to get to a box on Network3. I've been told by the admins of Network2 that it's not possible for them to route traffic from Network1 to Network3. I've finally been authorised to host a box in Network2 and I'm hoping with this I can set something up to resolve the issue. My question is should I set this up as a Windows or a Linux box. My initial thought was to use iptables to reroute requests but with my lack of experience with Windows Server (used for something or other in Network2) I'm not sure if this will work. My head's full of questions like: - can I get an ip without logging in to a windows domain? - if I do get an ip, do Windows Servers manage routing through the VPN? - can I make a linux box authenticate with Windows Server to log on to the domain? - would it just be easier to set up a windows box? - is it possible to configure a windows box to do routing from Network1 to Network3? Has anyone done anything like this before? Had experience managing Windows Server? Authenticated (or not as the case may be) to a Windows domain? I'd really appreciate your advice. It might be worth mentioning that the overall objective is to establish a telnet connection from a box on Network1 to a box on Network3.

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• VMWare Converter - Remote Linux Install P2V

  - by Zed Said

  I am trying to get what I thought was an easy process working. Here is my situation. I have a remote linux server (running Debian) that I would like to turn into a VM so that I can do testing on it rather than the production server. I downloaded VMWare Converter. I went to the "convert machine" wizard, chose Powered-on machine, entered my remote machine details. Clicking next shows that it correctly connects to my remote linux box. Now, on the next screen, for Destination type, it enters "WMWare Infrastructure virtual machine", and I can't change this. This is where I am stuck. Why do I need another sever to convert with? Is this where my VM gets sent to? And why can't I just convert the VM and save it on the computer that I am running the converter program on? If I do have to use a vmware infrastructure destination, I am confused at what ESX is, why and how I use it. Any help with this process would be more than appreciated!

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