RE: [Xen-users] Xen 3.2.1-2 on Debian Lenny 2.6.26 2.6.26-24

[Maciej Liżewski <maciej.lizewski@xxxxx>]

Hi,

 

Thanks for answer. I’ll try your suggestions about changes in configuration.

 

Don’t know if amd64 kernel will run stable, as this is dual Intel Xeon machine…

 

My configuration is very simple, example of one machine: dom0 is just Xen host with network configured as custom script using two bridges (eth0, eth1). Root partition has 10GB, rest is managed by LVM for DomU’s. It has ~700MB ram. That’s all, there are no other services on Dom0

 

DomU’s are created to provide services:

DomU 1: MySQL 5.1 (from lenny-backports), ext3 (former I have tried XFS here with same effect), 3GB ram

DomU 2: Web (Apache2, php5 as fastcgi, vsftpd, dkim-filter for emails sent from scripts), XFS, 2GB ram

DomU 3: Reverse proxy (Nginx, ftp_proxy, awstats as fastcgi), XFS, 1.2GB ram

 

Every domain (dom0, domU’s) have postfix as MTA

 

Everything installed via apt-get, no compilation, just default apt repository + lenny-backports in some cases… 3^rd DomU (reverse proxy) is most stable. It haven’t crash at all. Others crash at least one of them in week…

If you need any other information – just let me know.

 

--

Maciek

 

From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx [mailto:xen-users-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Peter Viskup
Sent: Tuesday, July 06, 2010 9:21 PM
To: xen-users@xxxxxxxxxxxxxxxxxxx
Subject: Re: [Xen-users] Xen 3.2.1-2 on Debian Lenny 2.6.26 2.6.26-24

 

On 07/06/2010 07:06 PM, Maciej Liżewski wrote:

Hi,

 

Recently I have installed Debian Lenny on two different machines (different ram size, disks, Xeon dual and quad core, filesystems both xfs and ext3, etc). Packages versions:

 

Dom0:

ii  libc6-xen                         2.7-18lenny4               GNU C Library: Shared libraries [Xen version]

ii  libxenstore3.0                    3.2.1-2                    Xenstore communications library for Xen

ii  linux-image-2.6.26-2-xen-686      2.6.26-24                  Linux 2.6.26 image on i686, oldstyle Xen support

ii  linux-modules-2.6.26-2-xen-686    2.6.26-24                  Linux 2.6.26 modules on i686

ii  xen-hypervisor-3.2-1-i386         3.2.1-2                    The Xen Hypervisor on i386

ii  xen-linux-system-2.6.26-2-xen-686 2.6.26-24                  XEN system with Linux 2.6.26 image on i686

ii  xen-shell                         1.8-3                      Console based Xen administration utility

ii  xen-tools                         3.9-4                      Tools to manage Debian XEN virtual servers

ii  xen-utils-3.2-1                   3.2.1-2                    XEN administrative tools

ii  xen-utils-common                  3.2.0-2                    XEN administrative tools - common files

ii  xenstore-utils                    3.2.1-2                    Xenstore utilities for Xen

 

domU’s:

ii  libc6-xen                       2.7-18lenny4               GNU C Library: Shared libraries [Xen version

ii  linux-modules-2.6.26-2-xen-686  2.6.26-24                  Linux 2.6.26 modules on i686

 

 

those are common for both installations. Anly standard packages were installed using “apt-get”. No compiling, no unstable releases…. There are 2-3 DomU’s on each machine. There have very little usage (load average under 1.0). Both installations was made about month ago. During this time domU’s are randomly crashing. Interval between those crashes vary between single day and week. There are no logs about reason of those crashes, just “Domain has crashed” in xend.log and after that log about xen trying to respawn DomU but previous instance is still running. Only a single DomU on machine is crashing at a time – others run stable at the same time. Which DomU will crash next time is undeterminable and random…

Funny, that times of most those crashes are similar to MRTG executed from CRON (and log about this execution is often last in syslog just before crash), however there are nothing specific in MRTG config (getting cpu usage, load average, disk space) but using piped commands instead of snmp (they are simple: cat /proc/meminfo | grep | awk… and so on)

 

Dom0 during those crashes is stable and never crashed or been restarted…

 

Any suggestion how to solve this situation? Downgrade / upgrade to some ”unstable” packages that are known to be much more stable than those from default Lenny installation?

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Hi,
first I would recommend you to switch to amd64 kernel at least for dom0.
There were some issues with this 'xenified' Debian kernel version 2.6.26 some of us were fighting against them [1]. But these seems to be solved in current kernel.
The configuration option "(dom0-cpus 1)" in /etc/xen/xend-config.sxp on dom0 could probably solve the issue you are experiencing.

Other things you can do:
 - enable DEBUG loglevel in xend-config.sxp with "(loglevel DEBUG)"
 - configure your domU's with option "" - dom0 will not try to restart it in case domU will crash again

Could you describe your dom0/domU's configuration in more details?

[1] http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=571603
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=542250

--
Peter

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