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11 Nov '08

All, I would like to run Rlocate on centos 5, but i would have to recompile the kernel, which, when reading some posts about custom kernels on centos, is not recommended... Is there another way to get rlocate to work on the stock kernel ? http://rlocate.sourceforge.net/#kernel_configuration -- Test <test(a)remedial-teacher.nl>

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Re: [CentOS] Reinstalled Windows and GRUB - Cannot boot Linux - SOLVED
by Lanny Marcus 11 Nov '08

11 Nov '08

On Mon, Nov 10, 2008 at 4:32 PM, MHR <mhullrich(a)gmail.com> wrote: > On Mon, Nov 10, 2008 at 12:58 PM, Lanny Marcus <lmmailinglists(a)gmail.com> wrote: <snip> >> Question: Is /hda3 mounted properly? I don't think so, because when I >> try to boot Linux from the Grub menu on the HD, it gives me "Error 17: >> Cannot mount selected partition" > > When I had this error, it meant that grub could not find the boot > partition itself. (The boot PROM did, but grub doesn't see the disks > the same way and can get lost.) > > Someone just answered earlier in this thread that you need to change > your hd(0,2) to hd(0,1) on the grub boot line. That should work. You > don't need to do this from any special rescue boot, just boot the > system, and when the grub stage 2 boot selection shows with its > countdown, stop it (with the space bar) and use the grub shell to edit > that line and it _should_ boot properly. > > If WCTW, instead of downloading the CentOS 5 DVD, just pull down the > first CD image and burn that. It's a lot shorter than the whole DVD, > and it's all you need to get into rescue mode. All is well now! :-) I corrected the line in /etc/fstab and I can see the NTFS partition. As I expected, changing the line in the GRUB boot menu, as the box was booting, did not survive a reboot. I edited the lines for the 3 Linux Kernels, in /boot/grub/grub.conf and that fixed that problem.... I knew I had to edit those files, and what MHR (Mark) explained to me tonight, and apparently a poster prior to him, made it *much* easier. I would like to learn how to do things with the Live CD, but as it turns out, I did not need that for this problem and it just added to my frustration. Thanks again, to everyone!

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Running From Live DVD & Keeping Settings Between Boots
by Brent L. Bates 10 Nov '08

10 Nov '08

Someone posted how to use a memory card (USB or another kind) to save settings between boots of a Live CD/DVD. I believe it was posted not too long ago and I thought I had kept the email, but now that I'm looking for the information, I can not find it. I've done some searching and I either get way too many hits or way too few, none of which are what I'm looking for. Does anyone remember that post and can forward that message to me? Thanks. -- Brent L. Bates (UNIX Sys. Admin.) M.S. 912 Phone:(757) 865-1400, x204 NASA Langley Research Center FAX:(757) 865-8177 Hampton, Virginia 23681-0001 Email: B.L.BATES(a)larc.nasa.gov http://www.vigyan.com/~blbates/

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Hwinfo
by jarmo 10 Nov '08

10 Nov '08

Has anyone info about package hwinfo for Centos, rhel, fedora? Nice piece of commandline tools. Jarmo

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Reinstalled Windows and GRUB - Cannot boot Linux - fstab and grub.conf errors?
by Lanny Marcus 10 Nov '08

10 Nov '08

Background: This is a dual boot (Windows XP and CentOS 5.2 (32 bit) box. There were four (4) NTFS partitions. The C partition got full. I deleted the 4 NTFS partitions and did a clean install of Windows XP, into one (1) NTFS partition. I knew that I would need to install GRUB again and I did that, using the CentOS 5 Installation DVD. When I tried to boot into Linux, no joy. this is the GRUB error I got: Booting 'CentOS (2.6.18-92.1.17.el5)' root (hd0,2) Filesystem type unknown, partition type 0x8e Kernel /vmlinuz-2.6.18-92.1.17.el5 ro root=/dev/VolGroup00/LogVol00 rhgb quiet Error 17: Cannot mount selected partition Press any key to continue (same error, trying to boot the 2 older Linux Kernels) The CentOS 5 Installation DVD apparently is now damaged (Murphy's Law). I have available to me: (a) CentOS 5.2 i386 Live CD (I am running on that, as I write this email) (b) Knoppix Live Disk, V.5.1.1 (c) SystemRescueCD V.0.2.15 The partitions on my hard drive, as shown by QTParted on the Knoppix Live CD are now: 01 /dev/hda1 ntfs Active 02 /dev/hda2 ext3 (/boot) 03 /dev/hda3 unknown (CentOS LVM) My belief is that /hda3 is not mounted. If I click on the "Local Hard Drives" Icon under "disc" it only shows hda2 (the Linux /boot partition). How and where do I fix that? When I view /etc/fstab as centos user with the CentOS 5.2 Live CD, I see that the line I had to mount the NTFS data partition (E: when I had 4 NTFS partitions) showed it as /dev/hda6 Now, the only NTFS partition, C, is /dev/hda1. Viewing it as centos user, in gedit, it is read only. When I try to view it as root, it shows me a /etc/fstab file that apparently is created by the LiveCD and doesn't show the Windows partition. How do I edit the /etc/fstab file so I can change it from /hda6 to /hda1? Here's the file contents: /dev/VolGroup00/LogVol00 / ext3 defaults 1 1 LABEL=/boot /boot ext3 defaults 1 2 devpts /dev/pts devpts gid=5,mode=620 0 0 tmpfs /dev/shm tmpfs defaults 0 0 proc /proc proc defaults 0 0 sysfs /sys sysfs defaults 0 0 /dev/VolGroup00/LogVol01 swap swap defaults 0 0 /dev/hda6 /mnt/win ntfs-3g rw,umask=0000,defaults 0 0 TIA! Lanny

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Where is the file that sets aliases?
by Anne Wilson 10 Nov '08

10 Nov '08

I was having a problem in a shell script that turned out to be cp being aliased to 'cp -i'. Not a showstopper, once you realise it, but it did beg the question as to where this file is. I was told to look in /etc/profile.d, but that doesn't seem to be the case on my CentOS box. I can list aliases, so I know the file exists, but where? Anne

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Parallel/Shared/Distributed Filesystems
by Geoff Galitz 10 Nov '08

10 Nov '08

I'm looking at using GFS for parallel access to shared storage, most likely an iSCSI resource. It will most likely work just fine but I am curious if folks are using anything with fewer system requisites (e.g. installing and configuring the Cluster Suite). Specifically to our case, we have 50 nodes running in-house code (some in Java, some in C) which (among other things) receives JPGs, processes them and stores them for later viewing. We are looking to deploy this filesystem specifically for this JPG storage component. All nodes are running Centos 5.1 x86_64. -geoff Geoff Galitz Blankenheim NRW, Deutschland http://www.galitz.org

3 4

HA Storage Cookbook?
by Gordon McLellan 10 Nov '08

10 Nov '08

Hello List, Can anyone recommend some sites regarding building high-availability storage networks using centos (or the upstream providers brand name)? I need to have approx 2-3 tb of storage available via iscsi and smb, but worry about having it all on a single server. Most of the HA articles I'm reading deal with application high availability, but not storage. Right now I have a centos 4.6 box serving up a mirrored pair of 1tb drives via iscsi and smb, but the poor machine comes apart when anyone tries to write a lot of data. I'm hopefully to have a little budget to upgrade in Q1 2009. Ideally I'd like to get two boxes with proper hardware raid and have them in a cluster. Any suggestions are appreciated, Gordon

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cant boot after installation of centos 5
by Muhammad Alif Mohd Latif 10 Nov '08

10 Nov '08

Hi all, I'm having problems with the installation of CentOS 5 for i386 to my Dell Percision T4500 Workstation. The installation run just fine. The installation DVD had been tested before installation. After installation, the installer ask me to reboot. after reboot, when the msg for LVM saying detection of my LVMs, 1 or 2 lines after that my monitor turned off, but i believed the cpu is still running. I tried reboot several times but still got same problem. Can some one help me? -- Department of Chemistry, Faculty of Science, Universiti Putra Malaysia, 43400 Serdang, Selangor, MALAYSIA

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Problem with widescreen display
by Marko Vojinovic 10 Nov '08

10 Nov '08

I have a dual boot CentOS 5.2 / FC4 machine, and recently I have bought a new widescreen tft monitor. I used to use a plain 4:3 crt, and after plugging the 16:9 tft naturally X needed reconfiguring. This was easy in FC4, and seemed as easy in CentOS, but with a wrong result. Basically, what I did was to run system-config-display to reconfigure for the new monitor and resolution. All goes well, but after X restarts, I see a strange picture: the resolution indeed goes to 1680x1050 as is supposed to, but is squeezed/shrinked/scaled horizontally to match a 4:3 aspect ratio, leaving two (unequal) black bands on the left and right side of the monitor. This is specific to 1680x1050 resolution, while lower ones display ok up to the fact that the virtual screen is usually bigger than the displayed part so scrolling is necessarry (and this is annoying, for I cannot see the panel and the top of the window simultaneously). The very same hardware and virtually same X configuration work perfectly ok on FC4, which suggests that this is not a hardware problem, nor an X problem. Further, as I see, FC4 has older version of virtually all software than CentOS. I have tried various acrobatics with xorg.conf, but nothing helped; read Xorg.0.log inside out and back, compared to FC4, and everything seems essentially identical. X seems to work as everything is ok, so is mplayer (even in fullscreen), but the black bands remain there and the whole desktop is scaled to 4:3. The monitor "autoadjust" button also doesn't help (although it works in general). I'm out of ideas where to look for the cause of this. If you wish, I can post xorg.conf and log files from both OSes, but they are mainly identical and I see nothing suspicious. Btw, this is on an nVidia GeForce 4 using the default nv driver. The vesa driver doesn't support widescreen resolutions, while nvidia binary driver crashes X completely on start (but this is a known motherboard problem common to FC4 as well). Is there some kernel setting or whatever that might "force" the graphics card to 4:3 aspect irrespective of X configuration? Some "filter" between what X tries to display and the actual signal to the monitor? What else can I try? Any advice appreciated! Best, :-) Marko

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