Re: [libvirt-users] libvirt live migrate problem
Hi,
On 04/02/2014 12:34 PM, lyz_pro wrote:
The problem is after I successful live migrate a domain, the domain
os become read-only.
and when I use qemu-img to show the disk info at node which domain
current running ,
the command return 'Permission denied'. BUT, I can use qemu-img show
the disk info at the previous node.
If you are using glusterfs, libvirt doesn't recognize it as a 'shared'
filesystem, and therefore does a 'chown' back to root:root when stopping
the image on one host, which gets into a race with chowning to
lilbvirt:qemu on the other. If the image ends up being owned by
root:root, then the guest no longer has access to the file system, and
switches to read-only.
There is a bug for this:
https://bugzilla.redhat.com/show_bug.cgi?id=1057645
The workaround is: to change /etc/libvirt/qemu.conf so it contains
"dynamic_ownership=0", and restart libvirt.
In comment 7 of the bug I described doing it by bringing all the guests
down, but I think you might be able to get away with just changing the
config file and restarting libvirt.
Regards, Paul Boven.
--
Paul Boven <boven(a)jive.nl> +31 (0)521-596547
Unix/Linux/Networking specialist
Joint Institute for VLBI in Europe - www.jive.nl
VLBI - It's a fringe science