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[Vulgarly-Selfish-Commercial] Project: Private Super computer (HPC) in a Private cloud
by Rajagopal Swaminathan 13 Jul '10

13 Jul '10

Greetings, I am atempting to build the above captioned environment. I will contribute to this list my learnings. I need income as I need to fund this project. Threre are various revenue sharing models I have in mind. One size just cant fit all after all. (angel investors or whatever, anybody)? My offer: "Every reply for this thread will get INR 11/- from me iff only I could remit my money in a single click to the thread posters and me." Learners should pay Rs. 21/- to cober my private tution charges and establishment charges that they choose engage with. Please contact me offlist. Regards, Rajagopal

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Superblock Problem
by Guy Boisvert 13 Jul '10

13 Jul '10

Hi all, After rebooting my CentOS 5.5 server, i have the following message: ================================== Red Hat nash version 5.1.19.6 starting EXT3-fs: unable to read superblock mount: error mounting /dev/root on /sysroot as ext3: invalid argument setuproot: moving /root failed: No such file or directory setuproot: error mounting /proc: No such file or directory setuproot: error mounting /sys: No such file or directory switchroot: mount failed: no such file or directory Kernel panic - not syncing: Attempted to kill init! I booted the server (rescue mode) with CentOS 5.4 x64 i have used to initially install it. It recognizes all the RAID1 partitions i have. cat /mnt/sysimage/proc/mdstat ============================ md3 : active raid1 sdb2[1] sda2[0] 2048192 blocks [2/2] [UU] md1 : active raid1 sdb3[1] sda3[0] 486134848 blocks [2/2] [UU] md0 : active raid1 sdb1[0] sda1[1] 200704 blocks [2/2] [UU] unused devices: <none> cat /mnt/sysimage/boot/grub/menu.lst =================================== # grub.conf generated by anaconda # # Note that you do not have to rerun grub after making changes to this file # NOTICE: You have a /boot partition. This means that # all kernel and initrd paths are relative to /boot/, eg. # root (hd0,0) # kernel /vmlinuz-version ro root=/dev/md1 # initrd /initrd-version.img #boot=/dev/md0 default=0 timeout=5 splashimage=(hd0,0)/grub/splash.xpm.gz hiddenmenu title CentOS (2.6.18-164.10.1.el5xen) root (hd0,0) kernel /xen.gz-2.6.18-164.10.1.el5 module /vmlinuz-2.6.18-164.10.1.el5xen ro root=/dev/md1 rhgb quiet module /initrd-2.6.18-164.10.1.el5xen.img title CentOS (2.6.18-164.10.1.el5) root (hd0,0) kernel /vmlinuz-2.6.18-164.10.1.el5 ro root=/dev/md1 rhgb quiet initrd /initrd-2.6.18-164.10.1.el5.img title CentOS (2.6.18-164.6.1.el5) root (hd0,0) kernel /vmlinuz-2.6.18-164.6.1.el5 ro root=/dev/md1 rhgb quiet initrd /initrd-2.6.18-164.6.1.el5.img title CentOS (2.6.18-164.6.1.el5xen) root (hd0,0) kernel /xen.gz-2.6.18-164.6.1.el5 module /vmlinuz-2.6.18-164.6.1.el5xen ro root=/dev/md1 rhgb quiet module /initrd-2.6.18-164.6.1.el5xen.img title CentOS (2.6.18-164.el5xen) root (hd0,0) kernel /xen.gz-2.6.18-164.el5 module /vmlinuz-2.6.18-164.el5xen ro root=/dev/md1 rhgb quiet module /initrd-2.6.18-164.el5xen.img title CentOS-base (2.6.18-164.el5) root (hd0,0) kernel /vmlinuz-2.6.18-164.el5 ro root=/dev/md1 rhgb quiet initrd /initrd-2.6.18-164.el5.img ./getinfo.sh disk ============== == BEGIN uname -rmi == 2.6.18-164.el5 x86_64 x86_64 == END uname -rmi == == BEGIN rpm -q centos-release == centos-release-5-5.el5.centos == END rpm -q centos-release == == BEGIN getenforce == Permissive == END getenforce == == BEGIN cat /etc/fstab == /dev/md1 / ext3 defaults,acl 1 1 /dev/md0 /boot ext3 defaults 1 2 tmpfs /dev/shm tmpfs defaults 0 0 devpts /dev/pts devpts gid=5,mode=620 0 0 sysfs /sys sysfs defaults 0 0 proc /proc proc defaults 0 0 /dev/md3 swap swap defaults 0 0 == END cat /etc/fstab == == BEGIN df -h == Filesystem Size Used Avail Use% Mounted on /dev/md1 450G 72G 355G 17% / /dev/md0 190M 45M 136M 25% /boot == END df -h == == BEGIN fdisk -l == Disk /dev/md0 doesn't contain a valid partition table Disk /dev/md1 doesn't contain a valid partition table Disk /dev/md3 doesn't contain a valid partition table Disk /dev/sda: 500.1 GB, 500107862016 bytes 255 heads, 63 sectors/track, 60801 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Device Boot Start End Blocks Id System /dev/sda1 * 1 25 200781 fd Linux raid autodetect /dev/sda2 26 280 2048287+ fd Linux raid autodetect /dev/sda3 281 60801 486134932+ fd Linux raid autodetect Disk /dev/sdb: 500.1 GB, 500107862016 bytes 255 heads, 63 sectors/track, 60801 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Device Boot Start End Blocks Id System /dev/sdb1 * 1 25 200781 fd Linux raid autodetect /dev/sdb2 26 280 2048287+ fd Linux raid autodetect /dev/sdb3 281 60801 486134932+ fd Linux raid autodetect Disk /dev/md0: 205 MB, 205520896 bytes 2 heads, 4 sectors/track, 50176 cylinders Units = cylinders of 8 * 512 = 4096 bytes Disk /dev/md1: 497.8 GB, 497802084352 bytes 2 heads, 4 sectors/track, 121533712 cylinders Units = cylinders of 8 * 512 = 4096 bytes Disk /dev/md3: 2097 MB, 2097348608 bytes 2 heads, 4 sectors/track, 512048 cylinders Units = cylinders of 8 * 512 = 4096 bytes == END fdisk -l == == BEGIN blkid == /dev/md3: TYPE="swap" /dev/md0: UUID="085a2fe2-a28b-4c82-aae8-d4711a73f824" TYPE="ext3" /dev/md1: UUID="4e26e66d-b4f3-45e3-8307-e13358b13610" TYPE="ext3" /dev/sdb3: UUID="4e26e66d-b4f3-45e3-8307-e13358b13610" TYPE="ext3" /dev/sdb2: TYPE="swap" /dev/sdb1: UUID="085a2fe2-a28b-4c82-aae8-d4711a73f824" TYPE="ext3" /dev/sda3: UUID="4e26e66d-b4f3-45e3-8307-e13358b13610" TYPE="ext3" /dev/sda2: TYPE="swap" /dev/sda1: UUID="085a2fe2-a28b-4c82-aae8-d4711a73f824" TYPE="ext3" == END blkid == Tried to boot from different kernels, same result. I searched Google and read something about superblock being "repeted" to many places on the filesystem but didn't tried anything because of bad explanations and fear of srewing up the partition. I already backed up the important stuff to another server. I'd like to know if it's possible to fix that problem quickly, if not i'll re-install it. But i'd like to know the fix anyway so if it appends again, would know what to do! Thanks! Guy Boisvert IngTegration inc. -- Guy Boisvert, ing. IngTegration inc. http://www.ingtegration.com AVIS DE CONFIDENTIALITÉ : ce message peut contenir des renseignements confidentiels appartenant exclusivement à IngTegration Inc. ou à ses filiales. Si vous n'êtes pas le destinataire indiqué ou prévu dans ce message (ou responsable de livrer ce message à la personne indiquée ou prévue) ou si vous pensez que ce message vous a été adressé par erreur, vous ne pouvez pas utiliser ou reproduire ce message, ni le livrer à quelqu'un d'autre. Dans ce cas, vous devez le détruire et vous êtes prié d'avertir l'expéditeur en répondant au courriel. CONFIDENTIALITY NOTICE : Proprietary/Confidential Information belonging to IngTegration Inc. and its affiliates may be contained in this message. If you are not a recipient indicated or intended in this message (or responsible for delivery of this message to such person), or you think for any reason that this message may have been addressed to you in error, you may not use or copy or deliver this message to anyone else. In such case, you should destroy this message and are asked to notify the sender by reply email.

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Setting apache's maxclients higher than 256 in CentOS
by robert mena 13 Jul '10

13 Jul '10

Hi, I could not find any reference if the version of apache compiled for centos 5.x has support for more than 256 clients in apache's maxclients. If that is not the case how can I recompile the package with such support? Regards.

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is it safe to resize root, on an LVM system, online?
by Rudi Ahlers 12 Jul '10

12 Jul '10

Hi, One of our servers has a too small root partition on LVM and needs to be resized. Can / be safely increased online, without a reboot? [root@zaxen02 ~]# lvscan ACTIVE '/dev/LVM01/root' [4.00 GB] inherit ACTIVE '/dev/LVM01/home' [20.00 GB] inherit ACTIVE '/dev/LVM01/var' [4.00 GB] inherit ACTIVE '/dev/LVM01/swap' [4.00 GB] inherit ACTIVE '/dev/LVM01/log' [1.00 GB] inherit ACTIVE '/dev/LVM01/webmin' [2.00 GB] inherit ACTIVE '/dev/LVM01/xenstored' [2.00 GB] inherit ACTIVE '/dev/LVM01/xensave' [2.00 GB] inherit ACTIVE '/dev/LVM01/opennation-net_img' [10.00 GB] inherit ACTIVE '/dev/LVM01/opennation-net_swap' [1.00 GB] inherit ACTIVE '/dev/LVM01/pluto_img' [100.00 GB] inherit ACTIVE '/dev/LVM01/pluto_swap' [1.00 GB] inherit ACTIVE '/dev/LVM01/tmp' [5.00 GB] inherit [root@zaxen02 ~]# pvscan PV /dev/md1 VG LVM01 lvm2 [232.69 GB / 76.69 GB free] Total: 1 [232.69 GB] / in use: 1 [232.69 GB] / in no VG: 0 [0 ] [root@zaxen02 ~]# -- Kind Regards Rudi Ahlers SoftDux Website: http://www.SoftDux.com Technical Blog: http://Blog.SoftDux.com Office: 087 805 9573 Cell: 082 554 7532

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Project Management Solutions
by Joseph L. Casale 12 Jul '10

12 Jul '10

I need to implement a solution and not having ever used anything but MS Project I would be grateful for a reco on something good. The only hope would be that its web based but I am open to anything! Thanks! jlc

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Samba and file permissions
by Todd Cary 12 Jul '10

12 Jul '10

A problem that has plagued me for a long time (finally decided to get some expert help) is setting the owner/group on directories/files I create with samba. Here is my situation: On my Linux/Apache I have a user, smith. The /home/smith directory is owned by smith and is part of the group, todd (me) with permissions 775. This works fine until I create via samba a directory in smith e.g. /home/smith/test. The directory is owned by todd and smith cannot create a file in it. What have I missed and how do I fix it? Todd P.S. My admin expertise is just moderate since my Linux server just runs and runs without much administration needed. -- Ariste Software Petaluma, CA 94952 http://www.aristesoftware.com

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"yum update": When is new header data downloaded? (Trying to set up custom repository...)
by Toralf Lund 12 Jul '10

12 Jul '10

I'm trying to set up a custom rpm respository for some in-house software, and configure a number of CentOS 5 clients so that they may install and update the software in question from the location in question. I think I've mostly figured out how to do this - I've successfully installed software on one of the clients via "yum install <my package>" after adding an URL of the form ftp://myserver/pub/<mysoftware> to the list of repositories, and uploading 1. A directory containing the packages. 2. A "repodata" directory generated by createrepo. to the appropriate server location. But then I wanted to see if could publish an upgrade, too, so I did, on the server-side: 1. Updated the release number in my rpm spec files and rebuilt. 2. Put the rpms on the right location. 3. createrepo -q --update <directory> And on the client yum update <my package> Problem is, this did nothing besides printing the message: No Packages marked for Update So I thought the repository hadn't been properly updated, but then I tried (still on the client): rm -rf /var/cache/yum/<mysoftware> yum update <my package> And, hey presto, the package was upgraded to the new version. So, it seems like I managed to correctly update the repodata and all, but originally, yum concluded that it didn't need to download a new version, but could use the one cached earlier. instead. Does anyone have any idea why this happened? How exactly does yum decide when to download new headers and when to reuse cached data? Thanks, - Toralf This e-mail, including any attachments and response string, may contain proprietary information which is confidential and may be legally privileged. It is for the intended recipient only. If you are not the intended recipient or transmission error has misdirected this e-mail, please notify the author by return e-mail and delete this message and any attachment immediately. If you are not the intended recipient you must not use, disclose, distribute, forward, copy, print or rely on this e-mail in any way except as permitted by the author.

3 6

Re: [CentOS] Smallest install?
by m.roth＠5-cent.us 12 Jul '10

12 Jul '10

Brunner, Brian T. wrote: > >> > I have a 500Mb ATA Flash drive in my machine. If I deselect >> > everything at install time (CentOS 5.0 - just for testing) it still >> > requires 524Mb. Is there any way of doing an even smaller install? >> >> Run a pre 5 series install and it is straightforward to hold size down >> >> There are lower thresholds one cannot go below and still stay >> with current updates. My article on 'tiny centos' provides >> 'slimming scripts' to trim away coherent sets to taste while >> still satisfying dependencies >> http://www.owlriver.com/tips/tiny-centos/ > > Thank you! Since I also want to make a tiny flash-based centos, I'll > look into this! Timny, flash-based? I recently bought an 8GB USB key for a netbook distro instal, and we have two here at work for some of our rackmounts that have no DVD reader. > >> Just because one is familiar with >> hammers does not mean one should be shaving cats with one > > That depends, in part, on how much one dislikes cats. > > Shaving pissed-off tomcats is best done with welding gloves and apron, > and a hammer. Um, that may not work, he says, thinking of his friend in the US northwet with a full-sized cougar.* ObDiscllosure: cat lover; likes dogs ok, otherwise I'd suggest grooming your dog with a hammer. mark

1 0

Correct permissions for uploading files
by Todd Cary 12 Jul '10

12 Jul '10

I am trying to implement PHP upload functionality for an application. When I attempt an upload in my test environment, I get the following error: An error has occurred: receiving directory insufficient permission... The upload form is reloading The destination file being moved by move_uploaded_file is /home/httpd//test/upload/uploads/1278898550-_DSC1159.jpg The initial file name is suppose to be /tmp/phpR1lmmc I am not sure what to set for Owner and Group for the "uploads" directory nor the permissions (it is now set to 775). Many thanks for some guidance for this matter... Todd -- Ariste Software Petaluma, CA 94952 http://www.aristesoftware.com

4 4

Smallest install?
by Stephen Harris 12 Jul '10

12 Jul '10

I have a 500Mb ATA Flash drive in my machine. If I deselect everything at install time (CentOS 5.0 - just for testing) it still requires 524Mb. Is there any way of doing an even smaller install? -- rgds Stephen

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