Discuss March 2011

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286 participants
250 discussions

Controlling the order of /dev/sdX devices?
by Cal Sawyer 08 Apr '11

08 Apr '11

Hi CentOS 5.4(final) 2.6.18-164el5PAE. I am trying to prevent removable USB and eSATA devices from occupying /dev/sdX devices ahead of a 3ware RAID controller. For example: at boot, if a USB drive and eSATA HDD (connected to an LSI 1068E onboard controller, reflashed in "IT" mode to handle hotplug devices) were both present, they would occupy devices /dev/sdb and /dev/sdc, ahead of the RAID controller which ends up as /dev/sdd. As these are removable devices, they should normally get handled by custom udev script looking for adds matching KERNEL=="sd[c-z][0-9]" ,SUBSYSTEM=="block", so the volume handled by RAID controller gets grabbed by udev but fails to mount and subsequent udev plug events fails due the slots left empty below /dev/sdd. If no hotplug devices are present while booting, fstab handles mounting of the system and RAID volume: SATA system HDD /dev/VolGroup00/LogVol00 / RAID array LABEL=STORE /store ## mounts == /dev/sdb1 I realise this description is kind of a tangle, but i am essentially looking for a way to hard-map the 3ware RAID controller to /dev/sdb (UUID won't work as there are multiples of this system) before PCI (?) enumeration picks up the USB and LSI-managed devices so that udev can take care of the device at /dev/sdc and above. I've tried blacklisting the mpt and usb-storage modules and short-circuiting SUBSYSTEM=="block" devices in 05-udev-early.rules, all with zero or negative effect. rc.sysinit doesn't appear to be the right place and that's about as deep down as i know how to go. cheers, cs

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Kernel Panic on HP/Compaq ProLiant G7
by Windsor Dave L. (AdP/TEF7.1) 07 Apr '11

07 Apr '11

Hello Everyone, I recently installed CentOS 5.5 x86_64 on a brand new ProLiant DL380 G7. I have identical OS software running reock-solid on two other DL380 ProLiant servers, but they are G6 models, not G7. On the G7, the installation went perfectly and the machine ran great for about 2 weeks, when it just seemed to "stop". The system stopped responding on the network, and there was no video on the console (or remote console via iLO). It would not reboot or cold boot through iLO, I actually had to hold the power to turn it off and then hit it again to power up. This happened several times within a few days of each other. Each time, there was no evidence in any logs of a problem - the system just seemed to stop or lock up. We did have a CPU problem light appear on the front, so HP came in and replaced the one 4-core CPU. Since then, it has run as long as two weeks, but still crashes randomly. After the last reboot, I left the console in text mode on vt1, and when it crashed again this morning this was displayed on the screen: CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffff8100dc435cf0 CR3: 000000008a6ca000 CR4: 00000000000006e0 Process smbd (pid: 18970, threadinfo ffff81001529e000, task ffff81011f5347a0) Stack: ffff81011e4e71c0 0000000000000000 ffff8100cf12a015 ffffffff80009c41 ffff81011e4e71c0 0000000100000000 000000030027ea9d ffff8100cf12a011 ffff81011e4e71c0 ffff81010d9cf300 ffff81011e4e71c0 ffff8101044099c0 Call Trace: [<ffffffff80009c41>] __link_path_walk+0x3a6/0xf5b [<ffffffff8000ea4b>] link_path_walk+0x42/0xb2 [<ffffffff8000cd72>] do_path_lookup+0x275/0x2f1 [<ffffffff80012851>] getname+0x15b/0x1c2 [<ffffffff800239d1>] __user_walk_fd+0x37/0x4c [<ffffffff80028905>] vfs_stat_fd+0x1b/0x4a [<ffffffff80039fa2>] fcntl_setlk+0x243/0x273 [<ffffffff80023703>] sys_newstat+0x19/0x31 [<ffffffff8005d229>] tracesys+0x71/0xe0 [<ffffffff8005d28d>] tracesys+0xd5/0xe0 Code: 00 00 00 00 00 00 00 00 70 4d 4f 9d 00 81 ff ff 98 e4 4b dc RIP [<ffff8100dc435cf0>] RSP <ffff81001529fd18> CR2: ffff8100dc435cf0 <0>Kernel panic - not syncing: Fatal exception This suggests that something happened in a Samba process. I have the Samba3x packages installed since we are beginning to introduce Win7 clients into our environment. Googling "Kernel panic - not syncing: Fatal exception" and "CentOS" produced many hits, but nothing that seemed to exactly match my problem. Since this is the only G7 server I have here right now, I can't reproduce the problem on another machine. The G6s I have running the identical version of CentOS have no problems. I am trying to determine if this is pointing to a hardware or software issue. Some of the Google results suggested using a Centosplus kernel - is this a good idea? The server is a HP DL380 G7 Server with 4 GB RAM (1 DIMM 1333 MHz), one 4-core CPU (2133 MHz), 4 built-in Broadcom "NetExtreme II BCM5709 II Gigabit Ethernet" NICs, and a P410 Smart Array Controller. The P410 and the system BIOS have both been updated to the latest levels to see if that fixes the crashes, with no change. Any idea where I should look next? Thanks for any help anyone can provide! Best Regards, Dave Windsor Robert Bosch LLC Team Leader, MES Database Infrastructure Group (AdP/TEF7.1) 4421 Highway 81 North Anderson, SC 29621 USA www.bosch.us Tel: 1 (864) 260-8459 Fax: 1 (864) 260-8422 Dave.Windsor(a)us.bosch.com

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OFFTOPIC :: IB hardware choice
by Adrian Sevcenco 06 Apr '11

06 Apr '11

Hi! I would need an advice from those that use IB (as admins :) ) i have a choice between : 1. Mellanox InfiniHost® III Lx HCA card, single-port CX4, DDR, PCIe x8, mem-free, tall bracket, RoHS R5 2. QLogic Single Port 20 Gb InfiniBand to x16 PCI Express Adapter (Single Pack) aside the price is there anything else that could help me make a discrimination between this two? (these will be used in twin servers for a small (up to 24 nodes) parallel cluster) Thanks! Adrian

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cobbler installation of CentOS-5.5
by Timothy Murphy 04 Apr '11

04 Apr '11

I'm trying to install CentOS-5.5 on my new HP micro-server, which has no CD drive. I've set up cobbler and cobbler-web on my old server, and can access cobbler-web from my laptop. I have 3 queries about the installation. 1. Is there any advantage is using the 64-bit CentOS rather than 32-bit? 2. The CentOS OS seems to be available in 7 or 8 CDs. (I tried downloading the DVD ISO with ktorrent, but this was a complete failure. It started OK, but then created literally thousands of links to one file, which brought my server down, and left it in a state which was quite hard to clean up.) But how exactly do I "cobbler import" these? I see that for Fedora on my laptop I ran sudo cobbler import --path=/mnt/dvd --name=F14-i386 3. Is there actually a way of converting the 7 or 8 CD ISOs into a DVD ISO? I saw instructions that suggested concatenating them, and then running rsync against a DVD ISO, at <http://lists.centos.org/pipermail/centos/2011-January/104448.html>. I tried the site recommended, but could not access the DVD ISO. In fact, if I could access a DVD ISO, couldn't I download it directly? So what would be the point of this exercise? -- Timothy Murphy e-mail: gayleard /at/ eircom.net tel: +353-86-2336090, +353-1-2842366 s-mail: School of Mathematics, Trinity College, Dublin 2, Ireland

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figuring out LogVol details for mount
by neubyr 03 Apr '11

03 Apr '11

Hi, I need to mount a LVM in rescue mode to create a new initrd image. I am not sure how do I fond out which LogVol is to be mounted. How do I find it out? In most of the configs I have used LogVol00 with ext3 filesystem which contains OS install. This particular system is not installed by me and I am not sure how do I find it out. I did try 'lvm lvs' command, but probably that's not the right command here. Any help? -- thanks, neuby.r.

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script question
by Jerry Geis 31 Mar '11

31 Mar '11

I can do "simply" search and replace with sed. However, I want to setup httpd.conf from a script that changes the default "/" which is presently: <Directory /> Options FollowSymLinks AllowOverride None </Directory> and change it to the following: <Directory /> Order Deny,Allow Deny from all AllowOverride None </Directory> How do you do that with scripts? Basically substitute everything between the two Directory tags. Thanks, Jerry

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Re: [CentOS] CentOS Digest, Vol 74, Issue 31
by Cal Sawyer 31 Mar '11

31 Mar '11

thanks for the reply, Phil It would, were udev not inserting USB and/or eSATA drives at /dev/sdb1 and/or /dev/sdc1 and exposing the array to the udev rule intended to handle only removable devices (at sdc or sdd). The array then mounts unpredictably in /media/xxx-sdc1 or sdd1 - not what is wanted - depend on how many removable devices are plugged at the time of rebooting. Of course, a single removable device will camp at sdb, which is out of reach of udev so the whole hotplug thing is broken until someone removes all of the devices at site, allowing a clean boot. mapper correctly places the / filesystem higher in position in rc.sysinit, followed by start_udev (where the damage gets done) and finally fstab evaluation way down the line. I suppose i could just hardwire the array mount into rc.sysint to engage after modules get loaded and hopefully before start_udev, unless there is a better way to enforce it. I'm not sure at this stage (need to analyse that ~1000-line script) if there is a suitable insertion point. It would be really good if it could be done outside of rc.sysint in some predictable place. We're "stuck" (but not unhappily) with this kernel/rev for the foreseeable future - i have over 100 of these systems and they are housed behind VPN'd networks, which mitigates somewhat their inevitable vulnerabilities. regards, - csawyer 30. Re: Controlling the order of /dev/sdX devices? (Phil Schaffner) CentOS 5.4(final) 2.6.18-164el5PAE. I am trying to prevent removable USB and eSATA devices from occupying /dev/sdX devices ahead of a 3ware RAID controller. For example: at boot, if a USB drive and eSATA HDD (connected to an LSI 1068E onboard controller, reflashed in "IT" mode to handle hotplug devices) were both present, they would occupy devices /dev/sdb and /dev/sdc, ahead of the RAID controller which ends up as /dev/sdd. As these are removable devices, they should normally get handled by custom udev script looking for adds matching KERNEL=="sd[c-z][0-9]" ,SUBSYSTEM=="block", so the volume handled by RAID controller gets grabbed by udev but fails to mount and subsequent udev plug events fails due the slots left empty below /dev/sdd. If no hotplug devices are present while booting, fstab handles mounting of the system and RAID volume: SATA system HDD /dev/VolGroup00/LogVol00 / RAID array LABEL=STORE /store ## mounts == /dev/sdb1 I realise this description is kind of a tangle, but i am essentially looking for a way to hard-map the 3ware RAID controller to /dev/sdb (UUID won't work as there are multiples of this system) before PCI (?) enumeration picks up the USB and LSI-managed devices so that udev can take care of the device at /dev/sdc and above. I've tried blacklisting the mpt and usb-storage modules and short-circuiting SUBSYSTEM=="block" devices in 05-udev-early.rules, all with zero or negative effect. rc.sysinit doesn't appear to be the right place and that's about as deep down as i know how to go. cheers, cs ------------------------------ Message: 30 Date: Thu, 31 Mar 2011 10:24:42 -0400 From: Phil Schaffner <Philip.R.Schaffner(a)NASA.gov> Subject: Re: [CentOS] Controlling the order of /dev/sdX devices? To: <centos(a)centos.org> Message-ID: <4D948EAA.2070005(a)NASA.gov> Content-Type: text/plain; charset="ISO-8859-1"; format=flowed Cal Sawyer wrote on 03/31/2011 08:13 AM: > Hi > > CentOS 5.4(final) 2.6.18-164el5PAE. I hope you are aware that you are using a very obsolete OS with a lot of known (i.e. exploitable) security holes and bugs that have subsequently been fixed. ... > I realise this description is kind of a tangle Indeed. Why does a line in /etc/fstab like LABEL=STORE /store ext3 defaults 1 2 not work?

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Virtualization platform choice
by Jussi Hirvi 31 Mar '11

31 Mar '11

Some may be bored with the subject - sorry... Still not decided about virtualization platform for my "webhotel v2" (ns, mail, web servers, etc.). KVM would be a natural way to go, I suppose, only it is too bad CentOS 6 will not be out in time for me - I guess KVM would be more mature in CentOS 6. Any experience with the free "VMware vSphere Hypervisor"?. (It was formerly known as "VMware ESXi Single Server" or "free ESXi".) http://www.vmware.com/products/vsphere-hypervisor/overview.html I would need a tutorial about that... For example, does that run without a host OS? Can it be managed only via Win clients? Issues with CentOS 4/5 guests (all my systems are currently CentOS 4/5). - Jussi -- Jussi Hirvi * Green Spot Topeliuksenkatu 15 C * 00250 Helsinki * Finland Tel. +358 9 493 981 * Mobile +358 40 771 2098 (only sms) jussi.hirvi(a)greenspot.fi * http://www.greenspot.fi

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CentOS-announce Digest, Vol 73, Issue 6
by centos-announce-request＠centos.org 31 Mar '11

31 Mar '11

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. CESA-2011:0392 Important CentOS 4 i386 x86_64 libtiff - security update (Johnny Hughes) ---------------------------------------------------------------------- Message: 1 Date: Thu, 31 Mar 2011 10:03:00 -0500 From: Johnny Hughes <johnny(a)centos.org> Subject: [CentOS-announce] CESA-2011:0392 Important CentOS 4 i386 x86_64 libtiff - security update To: CentOS-Announce <centos-announce(a)centos.org> Message-ID: <4D9497A4.9070205(a)centos.org> Content-Type: text/plain; charset="iso-8859-1" CentOS Errata and Security Advisory CESA-2011:0392 libtiff security update for CentOS 4 i386 and x86_64: https://rhn.redhat.com/errata/RHSA-2011-0392.html The following updated files have been uploaded and are currently syncing to the mirrors: i386: libtiff-3.6.1-18.el4.i386.rpm libtiff-devel-3.6.1-18.el4.i386.rpm x86_64: libtiff-3.6.1-18.el4.i386.rpm libtiff-3.6.1-18.el4.x86_64.rpm libtiff-devel-3.6.1-18.el4.x86_64.rpm src: libtiff-3.6.1-18.el4.src.rpm

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OT: IBM and Dell rack
by Fajar Priyanto 31 Mar '11

31 Mar '11

Hi all, sorry for the OT. Is IBM and Dell 42U rack compatible in dimension, rails, etc? Can we put IBM servers into Dell rack? Google says it depends. Much appreciated if you can share your experience. http://www.server-racks.com/why-all-racks-are-not-created-equal.html Thank you.

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Discuss March 2011