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NIC config documentation?
by Les Mikesell 01 Jul '10

01 Jul '10

Does anyone have a favorite howto or other succinct document that that describes how to set up networking on a multi-nic host when you don't know ahead of time which nic is which? I usually muddle through it by plugging in one wire at a time, using mii-tool to see which link is up, then ifconfig on that interface to get the HWaddr to put in the corresponding /etc/sysconfig/network-scipts/ifcfg-eth? file. But now I need to train some other people how to do it and it seems like there should be a better way. -- Les Mikesell lesmikesell(a)gmail.com

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Firefox slower on GMail since update to CentOS 5.5
by Mathieu Baudier 01 Jul '10

01 Jul '10

Hello, since I upgraded from CentOS x86_64 5.4 to 5.5, I noticed that Firefox has become significantly slower on GMail (or Google Apps Mail). The page becomes slow to scroll as soon as there are more than a few mails in a conversation (like in a typical CentOS mailing list thread). Did anyone else notice that as well? (I guess that I'm not the only GMail user around) Could I have missed something / do something wrong? More details: - I did a fresh install from the 5.5 install DVD, keeping only the home directories - I'm using the Nvidia driver from elrepo (but I had the pb also with the default driver) Cheers, Mathieu

8 20

Anyone seen the Adobe update?
by m.roth＠5-cent.us 01 Jul '10

01 Jul '10

Well, here it is, the day after the Adobe update was announced, and they say that I should go for 9.3.3... but there's still no update visible to yum. Anyone have an ETV on this? mark

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GNBD/LVM problem
by Kwan Lowe 01 Jul '10

01 Jul '10

Hello all: I'm having a strange problem with GNBD and LVM on two fully updated CentOS 5.5 x86_64 systems. On node1, I have exported a gnbd volume. lvcreate -L 500M -n mirrortest_lv01 mirrorvg gnbd_serv gnbd_export -d /dev/mirrorvg/mirrortest_lv01 -e node1_lv01 On node2 I have imported the volume: gnbd_import -i node1 Next, on node2 I attempt to create a mirrored LV with the imported GNBD volume and a local disk: fdisk /dev/gnbd/node1_lv01 then create an LVM partition fdisk /dev/sdb then create an LVM partition I can then create a volume group with those two disks: pvs vgcreate mirrorvg /dev/sdb1 /dev/gnbd0 The problem occurs when I try to create a mirrored LV using the above VG. [root@vm-helios-002 ~]# lvcreate --mirrorlog core -L 256M -n mirroredlv01 -m 1 mirrortestvg Insufficient suitable allocatable extents for logical volume : 64 more required Unable to allocate extents for mirror(s). It doesn't matter what disk sizes are available. Even creating a non-mirrored LV causes issues: [root@vm-helios-002 ~]# lvcreate -L 256M -n mirroredlv01 mirrortestvg Error locking on node 192.168.8.152: device-mapper: create ioctl failed: Device or resource busy Error locking on node 192.168.8.151: Volume group for uuid not found: xCTR5M2kOEBiLM7eSRntez2y2VKy9vvqnSs6LTC99x9kIsAdNI2l8CH90h6BYKsH Aborting. Failed to activate new LV to wipe the start of it. [root@vm-helios-002 ~]# The other issue that's occurring is that even if I remove the GNBD PV from the mirrortestvg, it still gives the error (i.e., using just local disk). Not sure where to look at this point. I suspect it has something to do with the cluster locking, but the configuration is really basic and specifies no clustered volumes.

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RHEL 6b2 Release
by b.j. mcclure 01 Jul '10

01 Jul '10

For those who might be interested, RHEL 6b2 has just been announced. http://www.redhat.com/rhel/beta Cheers, B.J. CentOS 5.5, Linux 2.6.18-194.3.1.el5 x86_64 10:47:08 up 8 days, 14:45, 1 user, load average: 0.56, 0.55, 0.49

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An Interview with Karan
by didi 01 Jul '10

01 Jul '10

A nice little insight into CentOS : http://distrowatch.com/weekly.php?issue=20100628#feature Cheers Didi p.s. Sorry if this has already been posted :) -- Hoffmann Geerd-Dietger http://contact.ribalba.de

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Re: [CentOS] Update update failed on filesystem-2.4.0-3.el5.x86_64
by Emmanuel Noobadmin 01 Jul '10

01 Jul '10

On 7/1/10, Bond Masuda <bond.masuda(a)jlbond.com> wrote: > I believe the filesystem RPM basically owns all the main directories on the > system. One of them being /media. I suspect you have something mounted on > /media, and since installing filesystem will try to create /media, that > results in an error it wasn't expecting. > > can you umount /media and try again? I think that would allow 'filesystem' > to complete its install process.... Thank you very much for the help, didn't realized /media was still mounted.

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Update update failed on filesystem-2.4.0-3.el5.x86_64
by Emmanuel Noobadmin 01 Jul '10

01 Jul '10

I was doing a upgrade of an existing machine from 5.4 to 5.5. Everything else worked except for this rpm filesystem-2.4.0-3.el5.x86_64 It seems that it's trying to unpack the file into the CentOS DVD mount point > Error unpacking rpm package filesystem-2.4.0-3.el5.x86_64 > error: unpacking of archive failed on file /media: cpio: lsetfilecon Would it be safe to manually download the rpm then install it locally, or would that not work either? I haven't restart the machine because I'm concerned that not updating this file could mean the filesystem becomes inaccessible.

2 1

How can binaries be different when package versions are identical? (mkfs.ext3 on CentOS 5.4)
by Aleksey Tsalolikhin 01 Jul '10

01 Jul '10

Situation: two similar servers, both with CentOS 5.4 64-bit. Making an ext3 filesystem on one takes seconds, on the other minutes. Partition Size Server 1 Server 2 1 GB 0.7 sec 0.3 sec 4 GB 2.5 sec 1.2 sec 40 GB 15 sec 13 min WTF e2fsprogs RPM is e2fsprogs-1.39-23.el5 on both systems mkfs --version reports "util-linux 2.13-pre7" on both systems mkfs -V reports the same on both systems (mke2fs 1.3 (29-May-2006) Using EXT2FS Library version 1.39) file size on mkfs and mkfs.ext3 binaries is identical However, checksum on these binaries differs across servers, and "cmp" reports files are different I took "mkfs" and "mkfs.ext3" from server 1, put them on server 2, and got an improvement: 40 GB 15 sec 3 min Just out of curiousity, I ran "rpm -V e2fsprogs" to see if rpm would pick up the difference and sure enough, it complained mkfs.ext3 changed. Both of these servers have CentOS 5.4; Server 1 was installed in Dec 2009, Server 2 in April 2010. I'd like to: (a) account for the difference in the binaries, and (b) see if something else is different that I can make the same to get the mkfs.ext3 time down to 15 sec on both systems. Solving (a) should shed light on (b). Any ideas? Best, Aleksey

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Live CD problems
by drew einhorn 01 Jul '10

01 Jul '10

Hi, I'm trying to repair a remote system using the Live CD. I have VPN access to the subnet where it lives. An onsite person is booting from cd, and running a small script I provided to tweak the default firewall rule set to allow incoming ssh, and set a password for the centos user and start sshd so far so good I can remotely access the system. the problem is the live cd environment is very fragile. I need to rebuild the contents of a couple filesystems, so I need to umount them and remount them rw. If I make a mistake in a mount command instead of giving an error message and letting me try again. The system freezes and any other ssh session freezes, ahnd will not accept any more incoming ssh connections. the only way I have found to recover is have the onsite person reboot from cd and rerun the script allowing incoming ssh again. Hmm. I should try to talk the onsite person through trying something else from the console. Argghhh!!! This is more than just an annoyance. -- Drew Einhorn "You can see a lot by just looking." -- Yogi Berra

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