[CentOS] QEMU configuration not persistent

[Paul Heinlein]

On Mon, 13 Feb 2012, Emmett Culley wrote:

> Since switching from CentOS 5.7 to CentOS 6.x I find that one of the 
> VMs will not restart upon system reboot.  I finally figured out that 
> the video is always set to vmvga after rebooting.  In addition the 
> VM's storage always reverts back to IDE from virtio and is set to 
> use the wrong image.
>
> It may be related to the fact that I moved the XML files that 
> defined the VMs from the old (CentOS 5.7) /etc/libvirt/qemu 
> directory to the new (CentOS 6.2) /etc/libvirt/qemu directory.  The 
> images are stored is the same LVM partitions as they were on the 
> CentOS 5.7
>
> Any ideas why a VM would revert back?  I've checked the XML file 
> before rebooting and it always has the correct info in it, until 
> after the reboot.

Did you copy the XML file from the 5.7 host to 6.3 host as-is or did 
you edit it at all during the migration?

I've found that I need either to run "virsh define $DOM.xml" and then 
start the new domain or run "virsh create $DOM.xml" and then, once 
it's running, make a trivial change (usually adding an XML comment) to 
the configuration via "virsh edit $DOM" to get things to stick.

-- 
Paul Heinlein <> heinlein at madboa.com <> http://www.madboa.com/