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Reassemble software RAID
by Kai Schaetzl 02 Dec '08

02 Dec '08

I have a machine on CentOS 5 with two disks in RAID1 using Linux software RAID. /dev/md0 is a small boot partition, /dev/md1 spans the rest of the disk(s). /dev/md1 is managed by LVM and holds the system partition and several other partitions. I had to take out disk sda from the RAID and low level format it with the tool provided by Samsung. Now I put it back and want to reassemble the array. Machine boots fine from sdb and I was able to re-add /dev/sda1 to /dev/md0 easily. However, I can't do the same with /dev/sda2 to /dev/md1 because there's no /dev/md1 anymore and mdadm tells me it doesn't have the RAID superblock. If possible I want to avoid deleting the already existing setup and data. I'm wondering what I shall do next. Can I simply create /dev/md1 as if it was a new array? Is the problem created by the fact that the running system was booted from a logical volume on /dev/sda2? Should I better boot the system from a live CD and then reassemble/create anew /dev/md1? In general, would it be better to *not* put the main system on a logical volume on a RAID partition? (The other logical volumes carry virtual machines.) Thus: /dev/md0 with /boot /dev/md1 with / (no LVM on it) /dev/md2 managed by LVM Kai -- Kai Schätzl, Berlin, Germany Get your web at Conactive Internet Services: http://www.conactive.com

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Anyone with experience with mini itx and Centos4?
by Jason Pyeron 02 Dec '08

02 Dec '08

I am looking to buy a small MB with dual NICs, but I woul like them to be supported directly by the stock kernel. I remember that gigabit nics can be a problem. I think this one (http://www.jetway-mini-itx.com/j7f4-j7f4k1g5d.html) uses the RealteK RTL8110SC and if so (https://www.centos.org/modules/newbb/viewtopic.php?forum=45&topic_id=6983&v… ode=threaded) might still be true. Am I crazy for not using Centos5 or will Centos5 solve all my problems? -jason -- -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- - - - Jason Pyeron PD Inc. http://www.pdinc.us - - Principal Consultant 10 West 24th Street #100 - - +1 (443) 269-1555 x333 Baltimore, Maryland 21218 - - - -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- This message is copyright PD Inc, subject to license 20080407P00.

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OpenChrome video driver for Centos
by Robert Moskowitz 02 Dec '08

02 Dec '08

I can find xorg-x11-drv-openchrome-0.2.901-1 for EL5, but not the current xorg-x11-drv-openchrome-0.2.903-1 (which only goes from FC8 on). Since my OQOs have the CX700M2 chip and there are listed enhancements for this chip in the 903 version, I would really like to get it...

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CentOS-announce Digest, Vol 46, Issue 2
by centos-announce-request＠centos.org 02 Dec '08

02 Dec '08

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. My God, it is full of stars (Ralph Angenendt) ---------------------------------------------------------------------- Message: 1 Date: Tue, 2 Dec 2008 00:07:08 +0100 From: Ralph Angenendt <ralph(a)centos.org> Subject: [CentOS-announce] My God, it is full of stars To: centos-announce(a)centos.org, centos(a)centos.org, centos-moderators(a)centos.org Message-ID: <20081201230531.GA7265(a)br-online.de> Content-Type: text/plain; charset="us-ascii" And it is fast! And big! And louder! What is? The new CentOS mail server is, which coincidentally also hosts the mailing lists you are reading right now. After three short hours and (AFAICS) no lost mail we now have the following situation: The mailq on the old mail server now is empty, while the new one is already fighting with stale dns info, unknown users, deferrals and so on. Normal insanity, I'd say. One word to our moderators and/or mailing list administrators: Everything should work as it did on the old machine. If your list *admin* password isn't working anymore, please drop me a mail so we can clear that up. Everybody else: Send even more mails! The infrastructure for that is here now! Cheers, Ralph

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LDAP Authentication and Authorisation.
by Friedrich Clausen 02 Dec '08

02 Dec '08

Hello all, At my current job the time has come to unify our LDAP infrastructure into one tree (preferably). The basics are working but we are not sure how to restrict which users can log into which machines. What we would like is for everyone in the (for example) "infra" group to log into all machines while people in the "development" group can only log into development servers. From an initial Google my options seem to be: * LDAP based netgroups * OpenSSH - AllowGroups, DenyGroups * PAM - mod_access Does anyone have any real world, in the trenches experience they would be willing to share? I would like to know which is the most maintainable and easy to hand-over to more junior admins. Thanks, Fred.

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CentOS-4 Xen kernel with low RAM and Badness in local_bh_enable at kernel/softirq.c:141
by Kingsly John 02 Dec '08

02 Dec '08

I have small xen VM running centos4 which acts as a router/firewall, and has been working fine for over 1.5 years with 32MB of RAM and a kernel I either got from xensource.org or built myself from their sources. (centos 4 didn't have a xen kernel back then) I lost the kernel to a corrupted disk and decided to use the centos provided xen kernel. All these months 32MB + 64MB Swap was more than sufficient and I never had any problems.(3-digit uptimes) The CentOS Xen kernel is unusable at 32MB and invokes the OOM killer even though there is plenty of swap free (and about 5-10MB of RAM too). After the OOM killer has done it's job there's about 15MB of RAM free and swap is hardly used at all (1MB at most) I've increased RAM to 64MB and the OOM killer doesn't kick in.. but I am seeing plenty of such messages in the logs ... Dec 2 16:05:21 noc kernel: Badness in local_bh_enable at kernel/softirq.c:141 Dec 2 16:05:21 noc kernel: [<c0121178>] local_bh_enable+0x47/0x6f Dec 2 16:05:21 noc kernel: [<c02177d5>] skb_checksum+0x133/0x25e Dec 2 16:05:21 noc kernel: [<c0250f06>] udp_poll+0x66/0x113 Dec 2 16:05:21 noc kernel: [<c02135fd>] sock_poll+0x19/0x1d Dec 2 16:05:21 noc kernel: [<c016d1a6>] do_select+0x190/0x2c7 Dec 2 16:05:21 noc kernel: [<c016ceb5>] __pollwait+0x0/0x9b Dec 2 16:05:21 noc kernel: [<c0144ae4>] __kmalloc+0x56/0xd3 Dec 2 16:05:21 noc kernel: [<c016d5dc>] sys_select+0x2e7/0x45c Dec 2 16:05:21 noc kernel: [<c010740f>] syscall_call+0x7/0xb Any idea what's causing it / how to make it stop ? I'm running Centos 5 in Dom0 and CentOS 4 in the router domU and there's another couple of Centos 5 domU which is running error free. Kingsly -- --------------------------------------------------------------------------- Kingsly At Users Dot SourceForge Dot Net -- http://kingsly.org/ ---------------------------------------------------------------------------

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Any idea when we will have updated kmod-drbd82 rpm for the latest kernel?
by mbneto 02 Dec '08

02 Dec '08

Hi, After searching the archive I found one post (last october) complaining about lack of kmod-drbd2 rpm for the lastest kernels. Almost two months have passed and no sign of the rpm I was wondering if the mantainer has some news about it. Thanks.

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script to find last accessed time?
by Tom Brown 02 Dec '08

02 Dec '08

Can anyone help me with the syntax to find last accessed time on a bunch of dir's - something like show me the files that were last accessed 6 months or more ago? thanks

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Educentos?
by Christopher Chan 02 Dec '08

02 Dec '08

Is there an Edubuntu equivalent for Centos?

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USB or PCI dialup modem supported by Centos
by Ramon Nieto 02 Dec '08

02 Dec '08

Hello everybody, I've searched google for a while looking for a list of USB or PCI dialup modems supported by CentOS without success. Any information on this subject will be really appreciated. Thank you.

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