Discuss November 2008

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254 discussions

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

15 32

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

6 9

can I use 2 HDD's with the same LVM labels at the same time?
by Rudi Ahlers 10 Nov '08

10 Nov '08

Hi all, I need to add a drive with the same LVM labels (i.e. system) to a machine with a drive with the same label. How can I access the data on both drive's LVM partitions at the same time? -- Kind Regards Rudi Ahlers

4 5

Hiding Files in Samba
by Vandaman 10 Nov '08

10 Nov '08

I may need a strong shot of coffee but I though putting "hide files = /~*/" as follows in the samba config file would hide files with a tilde. [homes] comment = Home Directories browseable = no writable = yes hide files = /~*/ Unfortunately after restarting the server the files are still visible. Regards, Vandaman.

4 7

Re: [CentOS] re: HA Storage
by Ross Walker 10 Nov '08

10 Nov '08

On Nov 9, 2008, at 11:38 AM, Stephen Harris wrote: > On Sun, Nov 09, 2008 at 08:30:42AM -0800, nate wrote: >> Stephen Harris wrote: >> >>> ZFS is really nice. If VMware was supported on Solaris 86 then I >>> would have built my own home server with Solaris rather than CentOS. >>> (Although I'm not using VMware on that machine, at present; merely >>> UserModeLinux for my protected instances). But CentOS is handling >>> my >>> 5*1Tbyte RAID5 OK for now :-) >> >> You know the inverse is true right? Solaris is supported on >> VMWare ESX(i). Though SATA disks are not officially supported >> by the VMFS file system in 3.x. > > I wanted Solaris as the Host OS so it could natively manage my disks > via ZFS. Making it a guest would be pointless. Underneath that I > would > run a couple of smaller Linux instances (eg for internet facing > services), > maybe a Windows instance and so on. You know you may not find VMware server for Solaris, but there is always Xen or VirtualBox. -Ross

4 3

Appliance platform
by Ted Miller 10 Nov '08

10 Nov '08

I have a project that I need some hardware pointers for. I need to build some Centos "appliances" (dedicated boxes to do one thing only). Target cost is under $250/box. Need: OS: Centos 5 Hardware Cost: less than $250 USD USB: at least 2 (not including keyboard) Memory: at least 128K Storage: prefer flash (USB stick OK) Network: 10 Base T Want: Height: less than 4" (fit on a 3RU shelf) Width: less than 10" (slide keyboard beside CPU on rack shelf)\ Display: 80x25 (or better) LCD on front of case (comes that way or I mount it there) Network: 2 x 10 Base T Application (in case anyone cares): Move better-than-FM quality audio across a leased audio circuit with delay under 10 seconds. No Internet exposure. Obviously one box is required at each end, and the encoding box works much harder than the decoding box. Software to run will probably be Ices -> Icecast -> network -> mplayer. Will be using USB audio interfaces, probably something like the M-Audio Fast Track Pro. Because of the nature of the application, once it is booted up the only disk activity is occasional logging when there is a problem with the connection. Any advice, web links, battle scars, or advice gladly accepted. Ted Miller Indiana, USA

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Discuss November 2008