Discuss March 2006

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274 participants
422 discussions

Filesystems, GRUB, weirdness, oh my! [long]
by Drew Weaver 03 Mar '06

03 Mar '06

I am using SystemImager to auto-install about 500 different machines, some of them are CentOS; as you can Imagine I want to automate the installation of the bootloader; so I wrote a 2 scripts to accomplish this task. Why two? Because some of the machines are IDE, and some of them are SATA, and I need to be able to use the same disk image on both of the drive types. Here is the first bash script: if grep -q sda /proc/diskstats then TYPE="sda1" MOUNT1="/dev/sda1 /a/boot" MOUNT2="/dev/sda3 /a" else TYPE="hda1" MOUNT1="/dev/hda1 /a/boot" MOUNT2="/dev/hda3 /a" fi mount $MOUNT2 mount $MOUNT1 MOUNT3="proc /a/proc -t proc -o defaults" mount $MOUNT3 MKSYS="-p /a/sys" MOUNT4="sysfs /a/sys -t sysfs -o defaults" mkdir $MKSYS mount $MOUNT4 MOUNT5="/dev /a/dev -o bind" mount $MOUNT5 echo "mount $MOUNT2" echo "mount $MOUNT1" cp /sbin/grubinstall /a/sbin/grubinstall chmod 755 /a/sbin/grubinstall chmod +x /a/sbin/grubinstall chroot /a /sbin/grubinstall exit 0 What this does is determines whether the drive is SATA or IDE by looking at diskstats, if it is SATA, it mounts /dev/sda1 & /dev/sda3, if it is IDE, it mounts /dev/hda1 & /dev/hda3, it also creates and mounts all of the auxillary filesystems (proc, sys, dev) The next script which I run in the CentOS environment via chroot is: TYPE= SUBS= if grep -q sda /proc/diskstats then TYPE="sda1" SUBS="s/hda/sda/g" else TYPE="hda1" SUBS="s/sda/hda/g" fi grub-install --no-floppy --recheck /dev/$TYPE sed -i "$SUBS" /boot/grub/menu.lst echo "sed -i $SUBS /boot/grub/menu.lst" sed -i "$SUBS" /etc/fstab echo "sed -i $SUBS /etc/fstab" sed -i "$SUBS" /boot/grub/grub.conf echo "sed -i $SUBS /boot/grub/grub.conf" sed -i "$SUBS" /etc/grub.conf echo "sed -i $SUBS /etc/grub.conf" ls "ls -l /etc/grub.conf /boot/grub/grub.conf /boot/grub/menu.lst" exit 0 By the way /a is the ROOT of the hard drive (freshly imaged) and /a/boot is the boot partition of the hard drive (freshly imaged). This script again enumerates the type of hard disk attached to the system, installs grub on /dev/hda1 or /dev/sda1, modifies /boot/grub/menu.lst /boot/grub/grub.conf /etc/fstab /etc/grub.conf sda>hda hda>sda and so forth. Everything actually works fine; grub is installed; the files are all modified appropriately. The issue comes when the newly imaged system comes up. The first time the system boots up; grub is still configured to boot with root=/dev/sda3; even though NONE of the configuration files mention anything about /dev/sda3. However if I hit 'E' and modify the 'kernel ...' line in the grub editor from the bootloader, and allow it to boot up; the system boots up normally. The STRANGE part; is that after the first time it boots off of /dev/hda3; grub suddenly starts using that EVERY time the system boots; but I cant figure out why I have to first manually change it; and then reboot before it will work. Its almost like the CentOS boot process 'fixes' whatever is wrong with grub; the first time it boots after I run my crazy script on it; but I cant figure out what process during the boot is doing it; or what else I need to do to ensure trouble free auto-installation of CentOS, the reason I am asking you all is because that same script appears to work with a few other distributions. Any advice anyone can give me would be wonderful. Thanks, -Drew

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Problem with large tar file.
by CentOS-List＠jamesplace.net 03 Mar '06

03 Mar '06

I have just completed installing CentOS 4.2 (I came over here from Fedora-Land (core-3)). I did this via a fresh install. I tar'd everything to an external drive reinstalled the new stuff and everything is working very well. I've just got one issue. I have a full system backup Backup.tar that has a size of 78,717,880,320. When I issue the command tar -xvf Backup.tar I get only about 111MB of data restored. Basically /root and a couple other odd things of little consequence. I did have a second backup made with cp -pR <stuff> <dest> so I've still got my all my stuff from which I can selectivly restore as needed but I'm wondering why tar didn't work? (While being very glad I made two backups.) Is there a max size limit to a tar file? A bug in tar? Curiosity plagues me. Thanks for any help.

5 6

LogIPTABLES
by Adriano Frare 03 Mar '06

03 Mar '06

Dear Friends, How I redirect messages of screen to file on IPTABLES ? Thanks Adriano

3 2

Re: [CentOS] 3ware 9550 series
by David Thompson 03 Mar '06

03 Mar '06

Will Dinkel wrote: > >I'll second that. We've been using the 9550sx 4/8/12 port cards in a >good number machines with positive results. If using RAID5 you need to >be picky about what SATA drives you use. WD desktop drives are known to >cause timeouts. Use the RAID edition drives instead. Most definitely. We have the 'YR' version drives for our eval. Dave

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CentOS-announce Digest, Vol 13, Issue 2
by centos-announce-request＠centos.org 03 Mar '06

03 Mar '06

Send CentOS-announce mailing list submissions to centos-announce(a)centos.org To subscribe or unsubscribe via the World Wide Web, visit http://lists.centos.org/mailman/listinfo/centos-announce or, via email, send a message with subject or body 'help' to centos-announce-request(a)centos.org You can reach the person managing the list at centos-announce-owner(a)centos.org When replying, please edit your Subject line so it is more specific than "Re: Contents of CentOS-announce digest..." Today's Topics: 1. CEEA:2006:0303-001 CentOS 4 i386 yumex Enhancement - update (extras only) (Johnny Hughes) 2. CEEA:2006:0303-001 CentOS 4 x86_64 yumex Enhancement - update (extras only) (Johnny Hughes) ---------------------------------------------------------------------- Message: 1 Date: Fri, 03 Mar 2006 04:35:25 -0600 From: Johnny Hughes <johnny(a)centos.org> Subject: [CentOS-announce] CEEA:2006:0303-001 CentOS 4 i386 yumex Enhancement - update (extras only) To: CentOS-Announce <centos-announce(a)centos.org> Message-ID: <1141382125.3823.39.camel(a)myth.home.local> Content-Type: text/plain; charset="us-ascii" CEEA:2006:0303-001 CentOS 4 i386 yumex Enhancement - update (extras only) Yum Extender (yumex) has been added to CentOS-4 i386 extras. Yum is the official (and preferred) CentOS installation and update tool. yumex is a Graphical User Interface for the yum. Special thanks to the yumex maintainer Tim Lauridsen for working with the CentOS team to roll in several of our suggested changes into this version of yumex. Tim also backported all the code he has done for yum-2.5.x so we can use it with the 2.4.x series of yum that is included in CentOS-4 ... and Tim has graciously accepted our request to maintain yumex for CentOS. You can install yumex with the command (if you have the extras repo enabled): yum install yumex The following files are uploaded and syncing to the mirrors: i386: yumex-0.99.11-1.0.c4.noarch.rpm src: yumex-0.99.11-1.0.c4.src.rpm

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RE: [CentOS] Advice on setting up Raid and LVM
by Bowie Bailey 03 Mar '06

03 Mar '06

Matt Hyclak wrote: > On Thu, Mar 02, 2006, Fajar Priyanto enlightened us: > > I'm setting up Centos4.2 on 2x80GB SATA drives. > > > > The partition scheme is like this: > > /boot = 300MB > > / = 9.2GB > > /home = 70GB > > swap = 500MB > > > > > > The RAID is RAID 1. > > md0 = 300MB = /boot > > md1 = 9.2GB = LVM > > md2 = 70GB = LVM > > md3 = 500MB = LVM > > > > Now, the confusing part is: > > 1. When creating VolGroup00, should I include all PV (md1, md2, > > md3)? Then create the LV. > > 2. When setting up RAID 1, should I make those separated partitions > > for /, /home, and swap? Or, should I just make one big RAID device? > > > > The future purpose of using LVM is I want to be able to expand any > > partitions that would run out of space into a new disk. > > Personally, I would do: > > md0 = 300MB (/boot) > md1 = 500MB (swap) > md2 = remainder (pv.00) > > I would then create a single volume group on md2, create / and home, > but I would leave 20-30% of the VG empty so you can expand later. > That would work out to like 10GB /, and 50GB /home, and leave you 15 > or so GB for expansion. Or you could do this: RAID 1 partition: md0 = 80GB (or whatever the useable total is) Then include md0 in VolGroup00 and create your logical volumes. LV0 = 300MB (/boot) LV1 = 500MB (swap) LV2 = 9.2GB (/) LV3 = 70GB (/home) This way everything is mirrored and everything is in one VG. If you need more space, add another pair of mirrored drives and add the new mirrored device into VolGroup00. Then you can use the space to expand whichever filesystem needs it. I would also advise following the previous poster's advice and leaving a few GB unused so that you aren't forced to add more drives immediately when LV2 fills up faster than you expected. -- Bowie

4 3

SeLinux Question
by Chris Weisiger 03 Mar '06

03 Mar '06

I do not have this directory: /etc/selinux/targeted/src/policy/domains/misc/local.te i dont have the directory src through misc in my /etc/selinux directory. How do i get these directories. Is there a rpm package i need to install? or are those just directories i make my self?

2 1

How to create user with period (.)
by spart cus 03 Mar '06

03 Mar '06

hi guys, how can i create a username with period ? Like for example username: linux.spartacus tia --------------------------------- Relax. Yahoo! Mail virus scanning helps detect nasty viruses!

6 6

pmacct
by Peter Kitchener 03 Mar '06

03 Mar '06

Does any know how to use pmacct. I would like to use something like this to measure network traffic on some of our hosts. I can download the package fine however i cannot find any documentation on this software anywhere. Regards, Peter K

1 0

per port ip routing -- possible?
by Jack Bailey 03 Mar '06

03 Mar '06

Hello, I have a customer who has two Internet connections, cable and DSL, where the cable is much faster than the DSL connection. Is it possible in CentOS 4.2 to use the "ip route" command to direct certain outbound traffic over the faster connection, say http(s) requests? Web searches turn up solutions where NAT is involved, but this guy isn't using NAT. Example configs that show how to load balance multiple connections and ensure symmetric routing all work great, but I don't an example of per-port routing. Any pointers or example commands would be greatly appreciated. Jack

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Discuss March 2006