I''ve had Xen crash a couple of times in the last 6 months, and I''m not sure quite how to fix it. Any help would be very much appreciated! First of all, on a Dell PE 2950, on Dom0 I''m running CentOS 5.0 with Xen 3.0.3 Linux dom0.mydomain.com 2.6.18-8.1.8.el5xen #1 SMP Tue Jul 10 07:06:45 EDT 2007 x86_64 x86_64 x86_64 GNU/Linux I''m running Xen 3.0.3 -- here are relevant entries from yum.log Jun 27 01:14:18 Updated: xen-libs.x86_64 3.0.3-25.0.3.el5 Jun 27 01:14:18 Updated: xen-libs.i386 3.0.3-25.0.3.el5 Jun 27 01:14:45 Updated: xen.x86_64 3.0.3-25.0.3.el5 Jun 27 01:15:11 Installed: kernel-xen.x86_64 2.6.18-8.1.6.el5 Jul 18 12:54:56 Installed: kernel-xen.x86_64 2.6.18-8.1.8.el5 The domUs have all been updated to CentOS 5.1. Basically, the whole system just reboots, and there is nothing in any of the log files (I''ve looked in /var/log/messages on host and domUs, and on /var/log/xen/xend.log). The only difference I found was that on one of the domUs the ''last'' command shows a crash, while the other systems don''t, they just show the reboot... reboot system boot 2.6.18-53.1.21.e Wed Sep 17 20:51 (12:48) johndoe pts/5 71.158.165.277 Wed Sep 17 19:42 - crash (01:09) It is not unlikely that that user was doing something that might have used a lot of memory/cpu/io, and that that might have triggered the crash. So, I''m at a loss as to how to proceed. Please, give me some hints about where to look to figure out what happened! Best, Liam -- Liam Kirsher PGP: http://liam.numenet.com/pgp/ _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
Liam Kirsher <liamk@numenet.com> writes:> Basically, the whole system just reboots, and there is nothing in any > of the log files (I''ve looked in /var/log/messages on host and domUs, > and on /var/log/xen/xend.log).If the Dom0 is panicking, like any other kernel panic, you need either a logging console or a system dump to see what is happening. Kdump, I believe, works with xen, but setting up a serial console is a lot easier and gives me almost as much useful information. (at the server janitor level. I''m not really going to look at much more than the backtrace from the kernel dump, and that prints to console. A more skilled programmer might be able to do more with a dump.) Here is a rough-draft of a howto I wrote on setting up serial consoles (while cabling up my own servers the other weekend) http://book.xen.prgmr.com/mediawiki/index.php/Serial_console Essentially I setup a ''buddy system'' where each of my servers use com1 as their console, and then have a null modem from a usb serial dongle to com1 on a ''buddy server'' - I then use cu within a logging screen session to log the output. Obviously, if I had space in the rack for a serial concentrator, that would be a superior solution, but I don''t, and the serial dongles cost me about $3 each on ebay. _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users