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  • Cannot SSH to ubuntu server - openssh server owner changed

    - by Kshitiz Shankar
    I am using suPHP with Apache for virtual hosting but somewhere down the line my root ssh access is getting screwed up. I haven't been able to figure out why it is happening but eventually, my root user is not able to ssh to the server. I get this error: *** invalid open call: O_CREAT without mode ***: sshd: root@pts/3 terminated ======= Backtrace: ========= /lib/x86_64-linux-gnu/libc.so.6(__fortify_fail+0x37)[0x7f12fe871817] /lib/x86_64-linux-gnu/libc.so.6(+0xeb7e1)[0x7f12fe8527e1] sshd: root@pts/3[0x41a542] sshd: root@pts/3[0x41a9eb] sshd: root@pts/3[0x41aeb8] sshd: root@pts/3[0x409630] sshd: root@pts/3[0x40f9ed] sshd: root@pts/3[0x410dd6] sshd: root@pts/3[0x411994] sshd: root@pts/3[0x411f16] sshd: root@pts/3[0x40b253] sshd: root@pts/3[0x42be24] sshd: root@pts/3[0x40c9cb] sshd: root@pts/3[0x412199] sshd: root@pts/3[0x4061a2] /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xed)[0x7f12fe78876d] sshd: root@pts/3[0x407635] ======= Memory map: ======== 00400000-00448000 r-xp 00000000 ca:02 4554758 /usr/sbin/sshd 00647000-00648000 r--p 00047000 ca:02 4554758 /usr/sbin/sshd 00648000-00649000 rw-p 00048000 ca:02 4554758 /usr/sbin/sshd 00649000-00750000 rw-p 00000000 00:00 0 01794000-017b5000 rw-p 00000000 00:00 0 [heap] 7f12fd5ad000-7f12fd5c2000 r-xp 00000000 ca:02 3489844 /lib/x86_64-linux-gnu/libgcc_s.so.1 7f12fd5c2000-7f12fd7c1000 ---p 00015000 ca:02 3489844 /lib/x86_64-linux-gnu/libgcc_s.so.1 7f12fd7c1000-7f12fd7c2000 r--p 00014000 ca:02 3489844 /lib/x86_64-linux-gnu/libgcc_s.so.1 7f12fd7c2000-7f12fd7c3000 rw-p 00015000 ca:02 3489844 /lib/x86_64-linux-gnu/libgcc_s.so.1 7f12fd7c3000-7f12fd7db000 r-xp 00000000 ca:02 3489977 /lib/x86_64-linux-gnu/libresolv-2.15.so 7f12fd7db000-7f12fd9db000 ---p 00018000 ca:02 3489977 /lib/x86_64-linux-gnu/libresolv-2.15.so 7f12fd9db000-7f12fd9dc000 r--p 00018000 ca:02 3489977 /lib/x86_64-linux-gnu/libresolv-2.15.so 7f12fd9dc000-7f12fd9dd000 rw-p 00019000 ca:02 3489977 /lib/x86_64-linux-gnu/libresolv-2.15.so 7f12fd9dd000-7f12fd9df000 rw-p 00000000 00:00 0 7f12fd9df000-7f12fd9e6000 r-xp 00000000 ca:02 3489994 /lib/x86_64-linux-gnu/libnss_dns-2.15.so 7f12fd9e6000-7f12fdbe5000 ---p 00007000 ca:02 3489994 /lib/x86_64-linux-gnu/libnss_dns-2.15.so 7f12fdbe5000-7f12fdbe6000 r--p 00006000 ca:02 3489994 /lib/x86_64-linux-gnu/libnss_dns-2.15.so 7f12fdbe6000-7f12fdbe7000 rw-p 00007000 ca:02 3489994 /lib/x86_64-linux-gnu/libnss_dns-2.15.so 7f12fdbe7000-7f12fdd27000 rw-s 00000000 00:04 6167294 /dev/zero (deleted) 7f12fdd27000-7f12fdd33000 r-xp 00000000 ca:02 3489984 /lib/x86_64-linux-gnu/libnss_files-2.15.so 7f12fdd33000-7f12fdf32000 ---p 0000c000 ca:02 3489984 /lib/x86_64-linux-gnu/libnss_files-2.15.so 7f12fdf32000-7f12fdf33000 r--p 0000b000 ca:02 3489984 /lib/x86_64-linux-gnu/libnss_files-2.15.so 7f12fdf33000-7f12fdf34000 rw-p 0000c000 ca:02 3489984 /lib/x86_64-linux-gnu/libnss_files-2.15.so 7f12fdf34000-7f12fdf3e000 r-xp 00000000 ca:02 3489979 /lib/x86_64-linux-gnu/libnss_nis-2.15.so 7f12fdf3e000-7f12fe13e000 ---p 0000a000 ca:02 3489979 /lib/x86_64-linux-gnu/libnss_nis-2.15.so 7f12fe13e000-7f12fe13f000 r--p 0000a000 ca:02 3489979 /lib/x86_64-linux-gnu/libnss_nis-2.15.so 7f12fe13f000-7f12fe140000 rw-p 0000b000 ca:02 3489979 /lib/x86_64-linux-gnu/libnss_nis-2.15.so 7f12fe140000-7f12fe157000 r-xp 00000000 ca:02 3489996 /lib/x86_64-linux-gnu/libnsl-2.15.so 7f12fe157000-7f12fe356000 ---p 00017000 ca:02 3489996 /lib/x86_64-linux-gnu/libnsl-2.15.so 7f12fe356000-7f12fe357000 r--p 00016000 ca:02 3489996 /lib/x86_64-linux-gnu/libnsl-2.15.so 7f12fe357000-7f12fe358000 rw-p 00017000 ca:02 3489996 /lib/x86_64-linux-gnu/libnsl-2.15.so 7f12fe358000-7f12fe35a000 rw-p 00000000 00:00 0 7f12fe35a000-7f12fe362000 r-xp 00000000 ca:02 3489985 /lib/x86_64-linux-gnu/libnss_compat-2.15.so 7f12fe362000-7f12fe561000 ---p 00008000 ca:02 3489985 /lib/x86_64-linux-gnu/libnss_compat-2.15.so 7f12fe561000-7f12fe562000 r--p 00007000 ca:02 3489985 /lib/x86_64-linux-gnu/libnss_compat-2.15.so 7f12fe562000-7f12fe563000 rw-p 00008000 ca:02 3489985 /lib/x86_64-linux-gnu/libnss_compat-2.15.so 7f12fe563000-7f12fe565000 r-xp 00000000 ca:02 3489886 /lib/x86_64-linux-gnu/libdl-2.15.so 7f12fe565000-7f12fe765000 ---p 00002000 ca:02 3489886 /lib/x86_64-linux-gnu/libdl-2.15.so 7f12fe765000-7f12fe766000 r--p 00002000 ca:02 3489886 /lib/x86_64-linux-gnu/libdl-2.15.so 7f12fe766000-7f12fe767000 rw-p 00003000 ca:02 3489886 /lib/x86_64-linux-gnu/libdl-2.15.so 7f12fe767000-7f12fe91c000 r-xp 00000000 ca:02 3489888 /lib/x86_64-linux-gnu/libc-2.15.so 7f12fe91c000-7f12feb1b000 ---p 001b5000 ca:02 3489888 /lib/x86_64-linux-gnu/libc-2.15.so 7f12feb1b000-7f12feb1f000 r--p 001b4000 ca:02 3489888 /lib/x86_64-linux-gnu/libc-2.15.so 7f12feb1f000-7f12feb21000 rw-p 001b8000 ca:02 3489888 /lib/x86_64-linux-gnu/libc-2.15.so 7f12feb21000-7f12feb26000 rw-p 00000000 00:00 0 7f12feb26000-7f12feb2f000 r-xp 00000000 ca:02 3489983 /lib/x86_64-linux-gnu/libcrypt-2.15.so 7f12feb2f000-7f12fed2f000 ---p 00009000 ca:02 3489983 /lib/x86_64-linux-gnu/libcrypt-2.15.so 7f12fed2f000-7f12fed30000 r--p 00009000 ca:02 3489983 /lib/x86_64-linux-gnu/libcrypt-2.15.so 7f12fed30000-7f12fed31000 rw-p 0000a000 ca:02 3489983 /lib/x86_64-linux-gnu/libcrypt-2.15.so 7f12fed31000-7f12fed5f000 rw-p 00000000 00:00 0 7f12fed5f000-7f12fef10000 r-xp 00000000 ca:02 3489831 /lib/x86_64-linux-gnu/libcrypto.so.1.0.0 7f12fef10000-7f12ff110000 ---p 001b1000 ca:02 3489831 /lib/x86_64-linux-gnu/libcrypto.so.1.0.0 7f12ff110000-7f12ff12b000 r--p 001b1000 ca:02 3489831 /lib/x86_64-linux-gnu/libcrypto.so.1.0.0 7f12ff12b000-7f12ff136000 rw-p 001cc000 ca:02 3489831 /lib/x86_64-linux-gnu/libcrypto.so.1.0.0 7f12ff136000-7f12ff13a000 rw-p 00000000 00:00 0 7f12ff13a000-7f12ff150000 r-xp 00000000 ca:02 3490020 /lib/x86_64-linux-gnu/libz.so.1.2.3.4 7f12ff150000-7f12ff34f000 ---p 00016000 ca:02 3490020 /lib/x86_64-linux-gnu/libz.so.1.2.3.4 7f12ff34f000-7f12ff350000 r--p 00015000 ca:02 3490020 /lib/x86_64-linux-gnu/libz.so.1.2.3.4Connection to stageserver.dockphp.com closed. After some debugging, I was able to narrow it down to a few things. For some reason the sshd daemon is running as root:www-data (apache user) instead of root. My ftp connection works but ssh over terminal fails. I have no idea whether it is getting caused due to suPHP or not (because that is the only place where user permission's etc. change). I really need to narrow it down and fix it asap. Thanks a lot!

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  • Where is vmlinux on my Ubuntu installation?

    - by Jason Baker
    I'm trying to work with starting up oprofile, and I'm running into a problem at this step: opcontrol --vmlinux=/path/to/vmlinux Ubuntu has no package called vmlinux, and when I do a locate vmlinux, I get a lot of files: /usr/src/linux-headers-2.6.28-14/arch/h8300/boot/compressed/vmlinux.lds /usr/src/linux-headers-2.6.28-14/arch/m68k/kernel/vmlinux-std.lds /usr/src/linux-headers-2.6.28-14/arch/m68k/kernel/vmlinux-sun3.lds /usr/src/linux-headers-2.6.28-14/arch/mn10300/boot/compressed/vmlinux.lds /usr/src/linux-headers-2.6.28-14/arch/sh/boot/compressed/vmlinux_64.lds /usr/src/linux-headers-2.6.28-14/arch/x86/boot/compressed/vmlinux_32.lds /usr/src/linux-headers-2.6.28-14/arch/x86/boot/compressed/vmlinux_64.lds /usr/src/linux-headers-2.6.28-14/include/asm-generic/vmlinux.lds.h /usr/src/linux-headers-2.6.28-15/arch/h8300/boot/compressed/vmlinux.lds /usr/src/linux-headers-2.6.28-15/arch/m68k/kernel/vmlinux-std.lds /usr/src/linux-headers-2.6.28-15/arch/m68k/kernel/vmlinux-sun3.lds /usr/src/linux-headers-2.6.28-15/arch/mn10300/boot/compressed/vmlinux.lds /usr/src/linux-headers-2.6.28-15/arch/sh/boot/compressed/vmlinux_64.lds /usr/src/linux-headers-2.6.28-15/arch/x86/boot/compressed/vmlinux_32.lds /usr/src/linux-headers-2.6.28-15/arch/x86/boot/compressed/vmlinux_64.lds /usr/src/linux-headers-2.6.28-15/include/asm-generic/vmlinux.lds.h /usr/src/linux-headers-2.6.28-16/arch/h8300/boot/compressed/vmlinux.lds /usr/src/linux-headers-2.6.28-16/arch/m68k/kernel/vmlinux-std.lds /usr/src/linux-headers-2.6.28-16/arch/m68k/kernel/vmlinux-sun3.lds /usr/src/linux-headers-2.6.28-16/arch/mn10300/boot/compressed/vmlinux.lds /usr/src/linux-headers-2.6.28-16/arch/sh/boot/compressed/vmlinux_64.lds /usr/src/linux-headers-2.6.28-16/arch/x86/boot/compressed/vmlinux_32.lds /usr/src/linux-headers-2.6.28-16/arch/x86/boot/compressed/vmlinux_64.lds /usr/src/linux-headers-2.6.28-16/include/asm-generic/vmlinux.lds.h Which one of these is the one I'm looking for?

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  • Where is vmlinux on my Ubuntu installation?

    - by Jason Baker
    I'm trying to work with starting up oprofile, and I'm running into a problem at this step: opcontrol --vmlinux=/path/to/vmlinux Ubuntu has no package called vmlinux, and when I do a locate vmlinux, I get a lot of files: /usr/src/linux-headers-2.6.28-14/arch/h8300/boot/compressed/vmlinux.lds /usr/src/linux-headers-2.6.28-14/arch/m68k/kernel/vmlinux-std.lds /usr/src/linux-headers-2.6.28-14/arch/m68k/kernel/vmlinux-sun3.lds /usr/src/linux-headers-2.6.28-14/arch/mn10300/boot/compressed/vmlinux.lds /usr/src/linux-headers-2.6.28-14/arch/sh/boot/compressed/vmlinux_64.lds /usr/src/linux-headers-2.6.28-14/arch/x86/boot/compressed/vmlinux_32.lds /usr/src/linux-headers-2.6.28-14/arch/x86/boot/compressed/vmlinux_64.lds /usr/src/linux-headers-2.6.28-14/include/asm-generic/vmlinux.lds.h /usr/src/linux-headers-2.6.28-15/arch/h8300/boot/compressed/vmlinux.lds /usr/src/linux-headers-2.6.28-15/arch/m68k/kernel/vmlinux-std.lds /usr/src/linux-headers-2.6.28-15/arch/m68k/kernel/vmlinux-sun3.lds /usr/src/linux-headers-2.6.28-15/arch/mn10300/boot/compressed/vmlinux.lds /usr/src/linux-headers-2.6.28-15/arch/sh/boot/compressed/vmlinux_64.lds /usr/src/linux-headers-2.6.28-15/arch/x86/boot/compressed/vmlinux_32.lds /usr/src/linux-headers-2.6.28-15/arch/x86/boot/compressed/vmlinux_64.lds /usr/src/linux-headers-2.6.28-15/include/asm-generic/vmlinux.lds.h /usr/src/linux-headers-2.6.28-16/arch/h8300/boot/compressed/vmlinux.lds /usr/src/linux-headers-2.6.28-16/arch/m68k/kernel/vmlinux-std.lds /usr/src/linux-headers-2.6.28-16/arch/m68k/kernel/vmlinux-sun3.lds /usr/src/linux-headers-2.6.28-16/arch/mn10300/boot/compressed/vmlinux.lds /usr/src/linux-headers-2.6.28-16/arch/sh/boot/compressed/vmlinux_64.lds /usr/src/linux-headers-2.6.28-16/arch/x86/boot/compressed/vmlinux_32.lds /usr/src/linux-headers-2.6.28-16/arch/x86/boot/compressed/vmlinux_64.lds /usr/src/linux-headers-2.6.28-16/include/asm-generic/vmlinux.lds.h Which one of these is the one I'm looking for?

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  • Which Ubuntu-like Linux OSs work well on a flash drive?

    - by Evan Kroske
    I want a Linux OS that I can load on a flash drive, but I don't want to relearn an entire operating system. I want to know which tiny Linux installations are most like Ubuntu. For example, I'd like to use the apt-get package manager, the Gedit text editor, and the bash shell. I'd like to use something that's already popular, stable, and highly compatible, but it needs to fit comfortably in one gig of my four-gig flash drive (just the essentials; I'll use the remaining three gigs to store installed programs and files). I have no preference for window managers; I just want something small and fast that works like Ubuntu. What is the most popular Ubuntu-like OS that can be easily run on a thumb drive? Edit: I'm not sure I understand how this works. I don't to use a USB drive as a LiveCD; I want to plug in a USB stick and use the computer as if it was my own. In other words, I want to be able to install programs on the drive on one computer and use them on another. Do any of these OSs let me do that? Please forgive my ignorance.

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  • Which linux distributions offer seamless support for UEFI and an LVM root out of the box?

    - by Jannik Jochem
    My new ultrabook (an Asus UX32VD) requires UEFI in order to boot from the internal harddisk. I use an LVM partition which contains my root fs and dual-boot Windows 8. I somehow managed to get this working on Sabayon Linux, however the overall process was pretty painful, and system upgrades keep breaking my configuration because everything depends on a hand-configured kernel and a hand-crafted GRUB2 configuration. This causes a lot of hassle and distractions for me, so I am considering to switch to a different distribution. However, I cannot find any concrete resources that precisely document the state of UEFI support in the popular distributions. As an example, the length of the Ubuntu wiki page on UEFI suggests that installing on UEFI systems is a non-trivial process, and this AskUbuntu thread on encrypted LVM on UEFI systems suggests that LVM might also be a problem. I know that this question seems somewhat open-ended, so I'll formulate concrete questions: Are there any Linux distributions with an installer that supports installing to an LVM root in a UEFI boot setting where Windows 8 is dual-booted? Which distributions support UEFI without having to jump through hoops in order to bootstrap into a UEFI-booted system or requiring manual configuration of the boot manager?

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  • Discount Codes Galore

    - by Cassandra Clark
    Saving money is at the top of everyones list right now. With this in mind the Oracle Technology Network team has compiled a list of discounts available at the Oracle Store. We are also introducing an Oracle Technology Network member discount from O'Reilly Media. If you subscribe to any of the Oracle Technology newsletters you also saw special discounts from CRC Press, Packt Publishing and Apress. We are going to do our best to bring you more offers like this every month. Now on to the discounts... Oracle Store offers - all below expiring May 31st 2010. Don't miss out! Expand Your Productivity with Oracle Open Office and Save 15%? Enter OTNOffice at checkout. Buy Now! Drive Business Agility and Performance with Industry-leading Oracle Database Management Packs.  Save 10% when you purchase them at the Oracle Store. Enter OTNDBMP at checkout. Buy Now! 15% Savings on Oracle Virtualization and Unbreakable Linux Support at the Oracle Store Enter code OTNLinuxVM at checkout. Buy Now! 20% Savings on Oracle SQL Developer Data Modeler Use OTNSQL at checkout. Buy Now! O'Reilly Oracle Technology Network Member Offer O'Reilly is generously offering Oracle Technology Network Members 35% off for print books and 40% off of eBooks. Browse Oracle titles at- http://oreilly.com/pub/topic/oracle. Use discount code TECNT at checkout.

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  • How can one compile Darwinia under Linux?

    - by Tobias Kienzler
    Introversion is now offering the Darwinia+Multiwinia source for sale, stating Note: You will need Windows and Visual Studio 2008 to build the games. We have tested that the code compiles correctly on the PC, but you will need to put some effort in to compile for Mac / Linux. There is no Xbox code in this release. Has anyone put this effort in already? The best answer would (be yes and) mention modifications that had to be done (also mentioning the distribution used), the second-to-best would explain why it doesn't work right now. Since I haven't bought the source pack I'm relying on up-votes as confirmation, so please comment on answers if something doesn't work or has to be modified e.g. for another Linux distribution. I'm currently using Ubuntu 8.04, but 10.04 or e.g. Gentoo would be a choice, too. EDIT: Clarification: The intention is to make a new game with that engine, but since this question is a prerequisite, it seems suitable here. UPDATE It is a bit off topic, but for those interested, Introversion added the source code of Uplink, Darwinia, Multiwinia and DEFCON to The Humble Introversion Bundle, so don't miss it!

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  • XAF DSL Tool Needs a new Team Lead

    - by Patrick Liekhus
    I have enjoyed my time on this project and have used it in several production projects.  However, with the enhancements in Visual Studio 2010 and the Entity Framework, the DSL tool doesn’t make sense for me to support at this time.  With that said, I am looking for someone who has interest to continue the project if they so desire.  I have moved my attention to creating a new project at Entity Framework Extensions for XAF.  We are converting the current DSL tool into the Entity Framework extensions.  The same code generation and everything else work.  However, the visual design surface is so much easier to work with.  If you have any questions, please let me know.  Also, please take a moment to look at the new project.  This is where all my effort going forward will be focused. Thanks again for all the support on my vision this far and enjoy.

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  • Introduction à XText : apprendre à créer une grammaire pour votre DSL, par Alain Bernard

    Bonjour à tous, Je vous propose un nouvel article qui concerne la création d'une grammaire avec Xtext. Xtext est un framework Eclipse qui permet de générer un IDE complet pour un DSL (Domain Specific Language), c'est-à-dire un langage métier. Dans cet article, seule la création de la grammaire pour le DSL est abordée, ainsi que la génération des briques de l'IDE grâce à Xtext. http://alain-bernard.developpez.com/...ammaire-xtext/ Un second article viendra qui portera sur la personnalisation de l'IDE généré par le framework. N'hésitez pas à profiter de cette discussion pour toute question ou commentaire ! Alain...

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  • Stupid Geek Tricks: Change Your IP Address From the Command Line in Linux

    - by Taylor Gibb
    Almost everybody can figure out how to change their IP address using an interface, but did you know you can set your network card’s IP address using a simple command from the command line? Changing Your IP From the Command Line in Linux Note: This will work on all Debian based Linux Distro’s. To get started type ifconfig into the terminal and hit enter, take note of the name of the interface that you want to change the settings for. To change the settings, you also use the ifconfig command, this time with a few parameters: sudo ifconfig eth0   192.168.0.1 netmask 255.255.255.0 That’s about all all you need to do to change your IP, of course the above command assumes a few things: The interface that you want to change the IP for is eth0 The IP you want to give the interface is 192.168.0.1 The Subnet Mask you want to set for the interface is 255.255.255.0 If you run ifconfig again you will see that your interface has now taken on the new settings you assigned to it. If you wondering how to change the Default Gateway, you can use the route command. sudo route add default gw 192.168.0.253 eth0 Will set your Default Gateway on the eth0 interface to 192.168.0.253. To see your new setting, you will need to display the routing table. route -n That’s all there is to it. How to Play Classic Arcade Games On Your PC How to Use an Xbox 360 Controller On Your Windows PC Download the Official How-To Geek Trivia App for Windows 8

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  • Encrypting a non-linux partition with LUKS.

    - by linuxn00b
    I have a non-Linux partition I want to encrypt with LUKS. The goal is to be able to store it by itself on a device without Linux and access it from the device when needed with an Ubuntu Live CD. I know LUKS can't encrypt partitions in place, so I created another, unformatted partition of the EXACT same size (using GParted's "Round to MiB" option) and ran this command: sudo cryptsetup luksFormat /dev/xxx Where xxx is the partition's device name. Then I typed in my new passphrase and confirmed it. Oddly, the command exited immediately after, so I guess it doesn't encrypt the entire partition right away? Anyway, then I ran this command: sudo cryptsetup luksOpen /dev/xxx xxx Then I tried copying the contents of the existing partition (call it yyy) to the encrypted one like this: sudo dd if=/dev/yyy of=/dev/mapper/xxx bs=1MB and it ran for a while, but exited with this: dd: writing `/dev/mapper/xxx': No space left on device just before writing the last MB. I take this to mean the contents of yyy was truncated when it was copied to xxx, because I have dd'd it before, and whenever I have dd'd to a partition of the exact same size, I never get that error. (and fdisk reports they are the same size in blocks). After a little Googling I discovered all luksFormat'ted partitions have a custom header followed by the encrypted contents. So it appears I need to create a partition exactly the size of the old one + however many bytes a LUKS header is. What size should the destination partition be, no. 1, and no. 2, am I even on the right track here? UPDATE I found this in the LUKS FAQ: I think this is overly complicated. Is there an alternative? Yes, you can use plain dm-crypt. It does not allow multiple passphrases, but on the plus side, it has zero on disk description and if you overwrite some part of a plain dm-crypt partition, exactly the overwritten parts are lost (rounded up to sector borders). So perhaps I shouldn't be using LUKS at all?

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  • Friday Spotlight: Network Troubleshooting with Oracle Linux

    - by Chris Kawalek
    Happy Friday, everyone! Our Spotlight this week is on a fantastic new article by Oracle's Robert Chase and posted on Oracle Technology Network. The article steps through, with command line examples, several strategies for tracking down network connectivity issues. From the article: "When applications that use network connectivity for communication are not working, the cause is often a mystery. Despite advances in modern operating systems, many users believe there is no way to directly "see" what's going over the wire, and that often leads to confusion and difficulties when something goes wrong. The reality is that you can actually see what's going over the wire, and there are a number of tools built into Oracle Linux for troubleshooting network issues. This article will help solve some of the mystery and make network connectivity a bit more user friendly." I highly recommend checking this article out, it's a good one! Network Troubleshooting with Oracle Linux  We'll see you next week! -Chris 

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  • mint linux, DVD drive keeps randomly being accessed. unsure how to find culprit

    - by juicebox
    I have a workstation with mint linux 12. It seems like the DVD drive on the machine keeps randomly "activating". By activating it makes noise, the light turns on, and it seems like it is checking if a disk is in it. At first I thought I was being hacked and someone/something was trying to check if I had media in the DVDRom drive. I ruled that out with netstat and rkhunter. I checked my logs and the only thing I can find that might help point out the problem are these repeated chunks in syslog: Mar 24 17:47:31 rich-MINT kernel: [ 9846.551422] ata2.00: cmd a0/00:00:00:08:00/00:00:00:00:00/a0 tag 0 pio 16392 in Mar 24 17:47:31 rich-MINT kernel: [ 9846.551424] res 51/40:01:00:00:00/00:00:00:00:00/a0 Emask 0x10 (ATA bus error) Mar 24 17:47:31 rich-MINT kernel: [ 9846.551427] ata2.00: status: { DRDY ERR } Mar 24 17:47:31 rich-MINT kernel: [ 9846.551433] ata2.00: hard resetting link Mar 24 17:47:32 rich-MINT kernel: [ 9846.868012] ata2.01: hard resetting link Mar 24 17:47:32 rich-MINT kernel: [ 9847.344054] ata2.00: SATA link up 1.5 Gbps (SStatus 113 SControl 310) Mar 24 17:47:32 rich-MINT kernel: [ 9847.344067] ata2.01: SATA link up 3.0 Gbps (SStatus 123 SControl 300) Mar 24 17:47:32 rich-MINT kernel: [ 9847.376118] ata2.00: configured for PIO0 Mar 24 17:47:32 rich-MINT kernel: [ 9847.393047] ata2.01: configured for UDMA/133 Mar 24 17:47:32 rich-MINT kernel: [ 9847.397046] ata2: EH complete and again Mar 24 17:55:28 rich-MINT kernel: [10323.633268] sr 1:0:0:0: ioctl_internal_command return code = 8000002 Mar 24 17:55:28 rich-MINT kernel: [10323.633270] : Sense Key : Aborted Command [current] [descriptor] Mar 24 17:55:28 rich-MINT kernel: [10323.633275] : Add. Sense: No additional sense information Mar 24 17:55:11 rich-MINT kernel: [10306.640009] ata2.00: link is slow to respond, please be patient (ready=0) Mar 24 17:55:16 rich-MINT kernel: [10310.840009] ata2.00: SRST failed (errno=-16) Mar 24 17:55:16 rich-MINT kernel: [10310.840016] ata2.00: hard resetting link Mar 24 17:55:16 rich-MINT kernel: [10311.160013] ata2.01: hard resetting link Mar 24 17:55:16 rich-MINT kernel: [10311.636061] ata2.00: SATA link up 1.5 Gbps (SStatus 113 SControl 310) Mar 24 17:55:16 rich-MINT kernel: [10311.636075] ata2.01: SATA link up 3.0 Gbps (SStatus 123 SControl 300) Mar 24 17:55:16 rich-MINT kernel: [10311.668122] ata2.00: configured for PIO0 Mar 24 17:55:16 rich-MINT kernel: [10311.684854] ata2.01: configured for UDMA/133 Mar 24 17:55:17 rich-MINT kernel: [10312.105473] ata2: EH complete (Copied from Pastebin - http://pastebin.com/YNDrnyzH) If any linux masters could take a quick look at these log outputs and help me understand what is going on , much appreciated.

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  • Configure IPv6 on your Linux system (Ubuntu)

    After the presentation on IPv6 at the first event of the Emtel Knowledge Series and some recent discussion on social media networks with other geeks and Linux interested IT people here in Mauritius, I thought that I should give it a try (finally) and tweak my local network infrastructure. Honestly, I have been to busy with contractual project work and it never really occurred to me to set up IPv6 in my LAN. Well, the following paragraphs are going to shed some light on those aspects of modern computer and network technology. This is the first article in a series on IPv6 configuration: Configure IPv6 on your Linux system DHCPv6: Provide IPv6 information in your local network Enabling DNS for IPv6 infrastructure Accessing your web server via IPv6 Piece of advice: This is based on my findings on the internet while reading other people's helpful articles and going through a couple of man-pages on my local system. Let's embrace IPv6 The basic configuration on Linux is actually very simple as the kernel, operating system, and user-space programs support that protocol natively. If your system is ready to go for IP (aka: IPv4), then you are good to go for anything else. At least, I didn't have to install any additional packages on my system(s). We are going to assign a static IPv6 address to the system. Hence, we have to modify the definition of interfaces and check whether we have an inet6 entry specified. Open your favourite text editor and check the following entries (it should be at least similar to this): $ sudo nano /etc/network/interfaces auto eth0# IPv4 configurationiface eth0 inet static  address 192.168.1.2  network 192.168.1.0  netmask 255.255.255.0  broadcast 192.168.1.255# IPv6 configurationiface eth0 inet6 static  pre-up modprobe ipv6  address 2001:db8:bad:a55::2  netmask 64 Of course, you might have to adjust your interface device (eth0) or you might be interested to have multiple directives for additional devices (eth1, eth2, etc.). The auto instruction takes care that your device is enabled and configured during the booting phase. The use of the pre-up directive depends on your kernel configuration but in most scenarios this might be an optional line. Anyways, it doesn't hurt to have it enabled after all - just to be on the safe side. Next, either restart your network subsystem like so: $ sudo service networking restart Or you might prefer to do it manually with identical parameters, like so: $ sudo ifconfig eth0 inet6 add 2001:db8:bad:a55::2/64 In case that you're logged in remotely into your PC (ie. via ssh), it is highly advised to opt for the second choice and add the device manually. You can check your configuration afterwards with one of the following commands (depends on whether it is installed): $ sudo ifconfig eth0eth0      Link encap:Ethernet  HWaddr 00:21:5a:50:d7:94            inet addr:192.168.160.2  Bcast:192.168.160.255  Mask:255.255.255.0          inet6 addr: fe80::221:5aff:fe50:d794/64 Scope:Link          inet6 addr: 2001:db8:bad:a55::2/64 Scope:Global          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1 $ sudo ip -6 address show eth03: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qlen 1000    inet6 2001:db8:bad:a55::2/64 scope global        valid_lft forever preferred_lft forever    inet6 fe80::221:5aff:fe50:d794/64 scope link        valid_lft forever preferred_lft forever In both cases, it confirms that our network device has been assigned a valid IPv6 address. That's it in general for your setup on one system. But of course, you might be interested to enable more services for IPv6, especially if you're already running a couple of them in your IP network. More details are available on the official Ubuntu Wiki. Continue to configure your network to provide IPv6 address information automatically in your local infrastructure.

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  • Create Custom Sized Thumbnail Images with Simple Image Resizer [Cross-Platform]

    - by Asian Angel
    Are you looking for an easy way to create custom sized thumbnail images for use in blog posts, photo albums, and more? Whether is it a single image or a CD full, Simple Image Resizer is the right app to get the job done for you. To add the new PPA for Simple Image Resizer open the Ubuntu Software Center, go to the Edit Menu, and select Software Sources. Access the Other Software Tab in the Software Sources Window and add the first of the PPAs shown below (outlined in red). The second PPA will be automatically added to your system. Once you have the new PPAs set up, go back to the Ubuntu Software Center and click on the PPA listing for Rafael Sachetto on the left (highlighted with red in the image). The listing for Simple Image Resizer will be right at the top…click Install to add the program to your system. After the installation is complete you can find Simple Image Resizer listed as Sir in the Graphics sub-menu. When you open Simple Image Resizer you will need to browse for the directory containing the images you want to work with, select a destination folder, choose a target format and prefix, enter the desired pixel size for converted images, and set the quality level. Convert your image(s) when ready… Note: You will need to determine the image size that best suits your needs before-hand. For our example we chose to convert a single image. A quick check shows our new “thumbnailed” image looking very nice. Simple Image Resizer can convert “into and from” the following image formats: .jpeg, .png, .bmp, .gif, .xpm, .pgm, .pbm, and .ppm Command Line Installation Note: For older Ubuntu systems (9.04 and previous) see the link provided below. sudo add-apt-repository ppa:rsachetto/ppa sudo apt-get update && sudo apt-get install sir Links Note: Simple Image Resizer is available for Ubuntu, Slackware Linux, and Windows. Simple Image Resizer PPA at Launchpad Simple Image Resizer Homepage Command Line Installation for Older Ubuntu Systems Bonus The anime wallpaper shown in the screenshots above can be found here: The end where it begins [DesktopNexus] Latest Features How-To Geek ETC Macs Don’t Make You Creative! So Why Do Artists Really Love Apple? MacX DVD Ripper Pro is Free for How-To Geek Readers (Time Limited!) HTG Explains: What’s a Solid State Drive and What Do I Need to Know? How to Get Amazing Color from Photos in Photoshop, GIMP, and Paint.NET Learn To Adjust Contrast Like a Pro in Photoshop, GIMP, and Paint.NET Have You Ever Wondered How Your Operating System Got Its Name? Create Shortcuts for Your Favorite or Most Used Folders in Ubuntu Create Custom Sized Thumbnail Images with Simple Image Resizer [Cross-Platform] Etch a Circuit Board using a Simple Homemade Mixture Sync Blocker Stops iTunes from Automatically Syncing The Journey to the Mystical Forest [Wallpaper] Trace Your Browser’s Roots on the Browser Family Tree [Infographic]

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  • Why not port Linux kernel to Common Lisp?

    - by rplevy
    Conventional wisdom states that OS kernels must be written in C in order to achieve the necessary levels of performance. This has been the justification for not using more expressive high level languages. However, for a few years now implementations of Common Lisp such as SBCL have proven to be just as performant as C. What then are the arguments against redoing the kernel in a powerfully expressive language, namely Common Lisp? I don't think anyone (at least anyone who knows what they are talking about) could argue against the fact that the benefits in transparency and readability would be tremendous, not to mention all the things that can't be done in C that can be done in Lisp, but there may be implementation details that would make this a bad idea.

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  • Linux Kernel - Refreshing VFS Dentry Cache

    - by Mike D
    I wrote a system call that opens a directory and gets the file object and the dentry struct. Im trying to list all entries including entries in subdirectories using the list_for_each() macro. The problem is its only displaying whats currently in the dentry cache. If I open the directory with nautilus then rerun the system call, all the entries are listed. Is there a way to check the exact list of entries or refresh the cache? f = s_open(tpath); fle = fget(f); d = fle->f_path.dentry; list_for_each ( position , &d->d_subdirs ) { dtmp = list_entry(position, struct dentry, d_u.d_child); ... } sys_close(f);

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  • How to find out memory layout of your data structure implementation on Linux 64bit machine

    - by ajay
    In this article, http://cacm.acm.org/magazines/2010/7/95061-youre-doing-it-wrong/fulltext the author talks about the memory layouts of 2 data structures - The Binary Heap and the B-Heap and compares how one has better memory layout than the other. http://deliveryimages.acm.org/10.1145/1790000/1785434/figs/f5.jpg http://deliveryimages.acm.org/10.1145/1790000/1785434/figs/f6.jpg I want to get hands on experience on this. I have an implementation of a N-Ary Tree and I want to find out the memory layout of my data structure. What is the best way to come up with a memory layout like the one in the article? Secondly, I think it is easier to identify the memory layout if it is an array based implementation. If the implementation of a Tree uses pointers then what Tools do we have or what kind of approach is required to map it's memory layout? Thanks!

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  • Is "DSLAM congestion" a legitimate reason for slow DSL?

    - by Jay Bazuzi
    My DSL has been extremely slow in the evenings recently. To test it, I telnet to my DSL Modem, and ping the gateway. This way I eliminate internet congestion and local network issues. In the mornings I get 30ms - 50ms pings. In the evenings, it bounces around a lot, but 10000ms pings are common. I complained to Qwest support, and they said it was a known issue on their end, their engineers were working on it, and wouldn't say anything else. A couple days later I complained again, and they sent out a technician. He tested my house wiring and found that one of them had a short. It was an unused line, so we disconnected it, and he said things looked better and left. My daytime speeds improved at this point, but evening is still bad. I complained to Qwest support again, and they said it was a problem with DSLAM congestion at their end, and that they were working on it, but no ETA. My neighbor has Qwest DSL and doesn't seem to have these problems. That seems strange. I go use her network when I absolutely must get online and mine is behaving badly. I can't tell if they're yanking my chain or not. Regardless, these speeds are crap. I'm paying for 7Mpbs but am lucky if I get 1/10th that in the evenings. My kids like to watch Netflix streaming movies, and it's just impossible after 5pm or so. Should I wait it out? Will complaining again produce any results? Should I change my subscription to a lower speed until they fix their end? Or switch to cable?

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  • Microsecond (or one ms) time resolution on an embedded device (Linux Kernel)

    - by ChrisDiRulli
    Hey guys, I have a kernel module I've built that requires at least 1 ms time resolution. I currently use do_gettimeofday() but I'm concerned that this won't work once I move my module to an embedded device. The device has a 180 Mz processor (MIPS) and the default HZ value in the kernel is 100. Thus using jiffies will only give me at best 10 ms resolution. That won't cut it. What I'd like to know is if do_gettimeofday() is based on the timer interrupt (HZ). Can it be guaranteed to provide at least 1 ms of resolution? Thanks!

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