Re: [Openstack] Changing the location of Nova's instances

Razique Mahroua Wed, 15 May 2013 08:06:43 -0700

Just use sed and some bashing :

virsh shutdown

virsh edit XXXXX

sed -> /var/lib/nova/instances -> /your/new/dir

cd /var/lib/nova/instances/

sed every libvirt.xml file

qemu img-convert -> /var/lib/nova/instances/_base/XXXX -f qcow2 -O /your/new/dir

cp /var/lib/nova/instances/instance-XXX/disk /your/new/dir

make a prayer then :

virsh start everything

Razique Mahroua - Nuage & Co

[email protected]

Tel : +33 9 72 37 94 15

Le 15 mai 2013 à 15:36, "Mac Innes, Kiall" <[email protected]> a écrit :

On 15/05/13 14:22, Daniel Ellison wrote:
On May 15, 2013, at 9:08 AM, "Mac Innes, Kiall" <[email protected]> wrote:
Personally, I would make use of a bind mount[1] rather than trying to relocate..

A bind mount is just like a symlink, with the exception of AppArmor (and I presume SELinux) will handle it "correctly"..
Ok, so I would move the entire /var/lib/nova directory to /home/storage, then do a bind mount back to /var/lib/nova? And that would require no config changes at all. Nice! Thanks for the tip, Kiall.

Regards,
Daniel
Yup - Or, you could just bind mount /var/lib/nova/instances, leaving the
rest on the local disks (I have *no clue* if Nova will handle that
nicely.. But bind mounts certainly will ;))

I use them pretty heavily inside instances to transparently re-locate
data (e.g. MySQL DB's, /var/log etc) the the instances second disk.
Doing this with a symlink, or by updating my.cnf would require
additional AppArmor config changes for the relocation to work. Using a
bind mount get's past this issue..

Anyway - As always, read up and experiment before deciding to go to
production!

Thanks,
Kiall

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Re: [Openstack] Changing the location of Nova's instances

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