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34753 discussions

Moving users from Debian-based distro to CentOS
by Dotan Cohen 09 Aug '10

09 Aug '10

I have a Debian machine with four users that I plan on migrating to CentOS. As per Debian habits the UIDs start with 1000. Is it enough to reuse the Debian /etc/shadow and /etc/passwd files over? Or will I need to configure some other things? I had considered just creating four new users starting from UID 500 then chown -R -ing the user's home directories, but I find that invasive and possibly error prone (maybe there are files that are not owned by them). All advice appreciated. Thanks. -- Dotan Cohen http://gibberish.co.il http://what-is-what.com

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Downgrade libgcc & gcc packages (is there a clean way)
by Dan Burkland 09 Aug '10

09 Aug '10

Hello all, I have been tasked with "fixing" one of our CentOS boxes by somehow downgrading the libgcc and gcc packages to a specific version (Required by the Oracle Grid Control client). Normally I'd just remove and reinstall the packages however removing libgcc is no fun as I found out the hard way it breaks pretty much every package including rpm & yum. Is there an elegant way to downgrade the currently installed libgcc & gcc packages? Thanks, Dan

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hplip under CentOS-5.5
by Timothy Murphy 09 Aug '10

09 Aug '10

Is anyone successfully using hplip under CentOS? When I try to print on my HP Officejet J4580 I always get the error ---------------------------------- Printer Filter "foomatic-rip-hplip" for printer "oj" not available: No such file or directory ---------------------------------- What I find puzzling is that I have googled for this, and it appears there has been the same problem with hplip for over a year. I'm using hplip-1.6.7-4.1.el5.4.x86_64 .

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fail2ban behavior
by Joseph L. Casale 09 Aug '10

09 Aug '10

I created a filter and verified it with fail2ban-regex against actual lines in my log and it works. During restarts of fail2ban, only some previous ip's get banned immediately whereas some need a reoccurrence despite the jail's config specification of maxretry and findtime suggesting the entries mandate blocking. I'd assume the behavior after a restart is noe way if it weren't for the seemingly random immediate notification of blocks being different? Anyone with experience using fail2ban know anything about this? Thanks, jlc

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what people really mean when they say they're running "5.3"?
by Robert P. J. Day 09 Aug '10

09 Aug '10

more a terminology usage question than anything else, but in a couple of weeks, i'll be teaching the first of a few sessions on RHEL admin and, unsurprisingly, i'll be using centos (as i've done in the past). when i asked the organizer to identify the specific version of RHEL that was being used at the client site, i was told 5.3 so i can easily install 5.3 on the classroom machines, but i'm curious about something and i'll have my contact look into it: if people *initially* install 5.3, is it standard behaviour to still regularly upgrade as new releases come out? obviously, i have to ask my contact to verify what the client has been doing all this time but, in general, what's the normal behaviour for people running centos/rhel? and is there a way to examine an install to see how updated it's been since that original installation? i just don't want to teach off of 5.3, only to find out later that they've been keeping up to date and 5.5 would have been a more appropriate choice. thanks for any tips. rday -- ======================================================================== Robert P. J. Day Waterloo, Ontario, CANADA Top-notch, inexpensive online Linux/OSS/kernel courses http://crashcourse.ca Twitter: http://twitter.com/rpjday LinkedIn: http://ca.linkedin.com/in/rpjday ========================================================================

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dhcp server
by Richard Gliebe 09 Aug '10

09 Aug '10

Hi all, this is my first post on this list, hope someone can help me. I have to run a dhcp server on CentOS release 5.5 (Final). # yum list| grep -i dhcp dhcp.x86_64 12:3.0.5-23.el5 installed dhcp-devel.x86_64 12:3.0.5-23.el5 installed dhcpv6-client.x86_64 1.0.10-18.el5 installed after starting the dhcpd daemon, the windows Clients on the subnet (192.168.100.0/24) tells me, that there is no dhcp server available. # /etc/init.d/dhcpd configtest Syntax: OK [/var/log/messages] Aug 9 07:11:14 tfelx01 dhcpd: Internet Systems Consortium DHCP Server V3.0.5-RedHat Aug 9 07:11:14 tfelx01 dhcpd: Copyright 2004-2006 Internet Systems Consortium. Aug 9 07:11:14 tfelx01 dhcpd: All rights reserved. Aug 9 07:11:14 tfelx01 dhcpd: For info, please visit http://www.isc.org/sw/dhcp/ Aug 9 07:11:14 tfelx01 dhcpd: Wrote 0 leases to leases file. Aug 9 07:11:14 tfelx01 dhcpd: Listening on LPF/eth0/00:1a:64:b6:1d:1c/192.168.100/24 Aug 9 07:11:14 tfelx01 dhcpd: Sending on LPF/eth0/00:1a:64:b6:1d:1c/192.168.100/24 Aug 9 07:11:14 tfelx01 dhcpd: Sending on Socket/fallback/fallback-net this is my /etc/dhcpd.conf # cat /etc/dhcpd.conf authoritative; ddns-update-style interim; subnet 192.168.100.0 netmask 255.255.255.0 { option routers 192.168.100.11; option subnet-mask 255.255.255.0; option domain-name "<mydomain>.local"; option domain-name-servers 192.168.100.2; option time-offset -18000; # Eastern Standard Time range 192.168.100.150 192.168.100.199; } what do I'm missing? or is there a config mismatch? many thanks Richard

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Re: [CentOS] ext4?
by James Bensley 09 Aug '10

09 Aug '10

On 9 August 2010 12:47, ... wrote: > If you want a production ready, fast, reliable, and > robust file system with years and exabytes of proven history behind it, > install and use XFS. Considering the problems I have been experiencing I had contemplate this however I have never used XFS before and thusly would directing on ho to install the required kernel modules to allow for XFS use on this particular box (if that is indeed what is required and presumable some XFS formatting and partitioning tools etc?) -- Regards, James. http://www.jamesbensley.co.cc/ There are 10 kinds of people in the world; Those who understand Vigesimal, and J others...?

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Re: [CentOS] ext4?
by Keith Roberts 09 Aug '10

09 Aug '10

On Sat, 7 Aug 2010, James Bensley wrote: > To: CentOS mailing list <centos(a)centos.org> > From: James Bensley <jwbensley(a)gmail.com> > Subject: Re: [CentOS] ext4? > > On 7 August 2010 19:59, Akemi Yagi <amyagi(a)gmail.com> wrote: >> They are all installed. Are you using RAID by any chance? Your >> grub.conf indicates that is from the second drive. > > /dev/sda1 / (ext3) > /dev/sda2 /storage (the ext4 in question, hardware RAID5 3.4TB) > /dev/sdb1 /boot (ext3) > > It seems like grub and/or yum have gone wrong somewhere over the years > and perhaps downloaded new kernels but not installed them? > > What would be a solution I should seek to achieve, compile them > myself? Or is there a way I can tell my CentOS box "these are here, > look you fool, use them!"? Well that's sort of what I do. If you have space to create a separate boot partition for GRUB, about 20MB should be plenty. You can create it as an ext3 logical partition, inside an extended partition. That should solve the GRUB Centos issue. You then need to reinstall GRUB to that separate boot partition, otherwise GRUB will still be looking to boot from the MBR of the first drive - if that's where it is now. You can install GRUB to separate boot partition by: Create the separate boot partition, and label it something like GrubBoot, using e2label /dev/sd?? GrubBoot. create the mountpoint; /mnt/GrubBoot ================================================================== ** AutoLinuxInstaller Fedora Installation I have created a seperate Grub boot logical partition, in the extended partition, called GrubBoot /dev/sda13. This enables me to do fresh Linux installations into /dev/sda1 and /dev/sda2, without destroying the GrubBoot partition. Here's a URL to my partition layout: http://i34.tinypic.com/r9nccz.jpg from grub-install man page: `--root-directory=DIR' Install GRUB images under the directory DIR instead of the root directory. This option is useful when you want to install GRUB into a separate partition or a removable disk. Here is an example in which you have a separate "boot" partition which is mounted on `/boot' (I use /mnt/GrubBoot): The installation of grub to the seperate partition was done by: First mount the GrubBoot partition with: mount -v -t ext3 -L GrubBoot /mnt/GrubBoot then grub-install --root-directory=/mnt/GrubBoot hd0 This was done with F12 as the active OS. Centos 5.5 and F12 will boot now from the GrubBoot partition. I noticed that re-installing GRUB from Centos 5.5 did not allow Fedora 12 to boot. But for some strange reason, when I re-installed GRUB from Fedora 12, this also allowed Centos 5.5 root partition to boot. Here is what my /mnt/GrubBoot/boot/grub/grub.conf file looks like. Note I've added some dummy entries at the end to distinguish where GRUB is booting from: # grub.conf generated by anaconda # # Note that you do not have to rerun grub after making changes to this file # NOTICE: You do not have a /boot partition. This means that # all kernel and initrd paths are relative to /, eg. # root (hd0,0) # kernel /boot/vmlinuz-version ro root=/dev/sda1 # initrd /boot/initrd-version.img #boot=/dev/sda # GRUB Linux # hd0,0 /dev/sda1 1st hard drive,1st partition # hd0,1 /dev/sda2 1st hard drive,2nd partition # hd0,2 /dev/sda3 1st hard drive,3rd partition # GRUB Linux # hd1,0 /dev/sdb1 2nd hard drive,1st partition # hd1,1 /dev/sdb2 2nd hard drive,2nd partition # hd1,2 /dev/sdb3 2nd hard drive,3rd partition # GRUB Linux # hd2,0 /dev/sdc1 3rd hard drive,1st partition # hd2,1 /dev/sdc2 3rd hard drive,2nd partition # hd2,2 /dev/sdc3 3rd hard drive,3rd partition default=0 timeout=5 splashimage=(hd0,12)/boot/grub/splash.xpm.gz hiddenmenu title Initial CentOS 5.5 DVD kernel (vmlinuz-2.6.18-194.el5) root (hd0,0) kernel /boot/vmlinuz-2.6.18-194.el5 ro root=LABEL=Centos-5-root noapm apm=off ide=nodma initrd /boot/initrd-2.6.18-194.el5.img title CentOS 5.5 system (vmlinuz-2.6.18-194.8.1.el5) root (hd0,0) kernel /boot/vmlinuz-2.6.18-194.8.1.el5 ro root=LABEL=Centos-5-root noapm apm=off ide=nodma initrd /boot/initrd-2.6.18-194.8.1.el5.img title Fedora 12 system (vmlinuz-2.6.32.12-115.fc12.i686.PAE) root (hd0,1) kernel /boot/vmlinuz-2.6.32.12-115.fc12.i686.PAE ro root=LABEL=Fedora-12-root noapm apm=off ide=nodma nomodeset initrd /boot/initramfs-2.6.32.12-115.fc12.i686.PAE.img title Fedora 12 system (2.6.31.9-174.fc12.i686.PAE) root (hd0,1) kernel /boot/vmlinuz-2.6.31.9-174.fc12.i686.PAE ro root=LABEL=Fedora-12-root noapm apm=off ide=nodma nomodeset initrd /boot/initramfs-2.6.31.9-174.fc12.i686.PAE.img title Fedora 12 system (2.6.31.5-127.fc12.i686.PAE) root (hd0,1) kernel /boot/vmlinuz-2.6.31.5-127.fc12.i686.PAE ro root=LABEL=Fedora-12-root noapm apm=off ide=nodma nomodeset initrd /boot/initramfs-2.6.31.5-127.fc12.i686.PAE.img title ... root (hd0,0) kernel /boot/vmlinuz-2.6.27.5-117.fc10.i686 ro root=LABEL=Fedora-10-root noapm apm=off ide=nodma initrd /boot/initrd-2.6.27.5-117.fc10.i686.img title ... root (hd0,0) kernel /boot/vmlinuz-2.6.27.5-117.fc10.i686 ro root=LABEL=Fedora-10-root noapm apm=off ide=nodma initrd /boot/initrd-2.6.27.5-117.fc10.i686.img title *** (Booting from GrubBoot logical partition /dev/sda13) *** root (hd0,0) kernel /boot/vmlinuz-2.6.27.5-117.fc10.i686 ro root=LABEL=Fedora-10-root noapm apm=off ide=nodma initrd /boot/initrd-2.6.27.5-117.fc10.i686.img Sorry for all the noise. Just want to help the guy. Kind Regards, Keith Roberts ----------------------------------------------------------------- Websites: http://www.php-debuggers.net http://www.karsites.net http://www.raised-from-the-dead.org.uk All email addresses are challenge-response protected with TMDA [http://tmda.net] -----------------------------------------------------------------

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CentOS 5.5 : Installing Sources where they are visible to system(VBOX driver install)
by MGW-Discussions 09 Aug '10

09 Aug '10

I have installed the source rpms on CentOS 5.5 due to virtualbox upgrade not functioning. (the old one that comes with centos works fine, however, I wanted to newer one.) Whenever I run the driver installation script it fails with an indication that it could not find the sources. How do I correct the issue with the system not seeing the installed source rpms? -- Respectfully, Martes G Wigglesworth M. G. Wigglesworth Holdings, LLC www.mgwigglesworth.com

4 6

When should LVM be used?
by Ron Blizzard 09 Aug '10

09 Aug '10

In my old computer I have a much bigger hard drive then in this one -- and I plan to hand that old computer down to one of my sons -- keeping his current drive from an even older computer. Currently the hard drive on my old computer has SuSE Linux, but that will go. I'll rebuild CentOS 5.5 on it, but I want to leave some free space for whatever comes up and also dual-boot Vector Linux. Which, at last, brings me to the question... Is there any reason to use LVM on a personal desktop install of CentOS? It seems to me, for my purposes, that LVM is just a pain in the neck -- although I've always just let CentOS set it up during the install in the past. I would like to be able to use parted to resize partitions when I want to, and also I'd like Vector Linux to be able to read and write data to the CentOS partition. Would I be missing something by not installing LVM, or is this mostly for server purposes anyhow? Thanks for any pointers. -- RonB -- Using CentOS 5.5

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