[CentOS] 5.2-5.3 Xen upgrade weirdness

Tom Diehl tdiehl at rogueind.com
Wed Apr 1 15:25:50 UTC 2009

Hi Timo,

On Wed, 1 Apr 2009, Timo Schoeler wrote:

> Hash: SHA1
> thus Tom Diehl spake:
> | Hi,
> |
> | Has anyone tried upgrading xen domu's from 5.2 to 5.3? I just did a
> | yum upgrade glibc & yum upgrade yum. All appeared to go well but when I
> | rebooted and tried to connect to the network, I could not. Looking at
> | /etc/sysconfig/network-scripts I see that the that there is now an
> ifcfg-eth0
> | and an ifcfg-eth0.bak. ifcfg-eth0 now contains configuration for a
> dynamically
> | configured interface and ifcfg-eth0.bak has the old static config
> information.
> |
> | In addition, the mac address of the interface has also been changed. I
> can put
> | everything back but I would like to know if this behavior is
> deliberate? If so
> | how do I revert whatever is making the changes so that this does not
> happen.
> | I have software on some of my domu's that requires me to go get new
> license
> | keys when mac addresses or ip addresses change.
> |
> | So far in my limited testing this only seems to happen on the domu.
> The dom0
> | seems to be OK, although I have not yet rebooted it.
> |
> | I did not see anything in the release notes.
> |
> | Regards,
> Hi Tom,
> you can nail the MAC addresses of the domU's in /etc/xen/auto/config-file:
> http://wiki.xensource.com/xenwiki/XenNetworking#head-d5446face7e308f577e5aee1c72cf9d156903722
> (see 'Additional Notes', also). If not set here, they will change every
> reboot (create, destroy) of domU.

I probably should have mentioned that I manage my domU's with cobbler and
virt-manager. Doesn't everybody? :-) It hard codes the mac addresses in the
config files when I setup the domU. Your reply did get me to look at the
config file though and I see that the date stamp on the config file is from
Dec. It looks like something else changed the mac address and the upgrade just
made an ifcfg-eth0 file to match. Since this machine is a sandbox it does not
run very much. It is possible I missed a previous change.

FWIW, I just upgraded another domU and it went flawlessly.

Sorry for the noise and thanks for the info.


Tom Diehl		tdiehl at rogueind.com		Spamtrap address mtd123 at rogueind.com

More information about the CentOS mailing list