Hello,
I have 2 use cases, asked by my users :
Be able to take a snapshot, and then :
1) be able to revert back an instance to the snapshot (conserving name
and IP addresses)
2 create new instances from the snapshot
The second one is the standard way of doing snapshots in OpenStack
(Nova).
For the first one, I found that nova rebuild is doing fine.
But. All this is working with standard snapshots, which create images.
It can be quite long. I also have a VMware region, and here, it's really
long to transfer between glance and nova.
So I tried to use volume (Cinder) backed instances.
If the storage supports COW or linked clones, it's fast.
But. Rebuild is not doing what we want (it does nothing in fact) :
http://lists.openstack.org/pipermail/openstack-dev/2015-July/068493.html
Other problem : with VMware, snapshot of volumes is not possible if the
volume is in the state 'in-use' (even if the VM is powered off).
There's a bug, the snapshot is created in error state, and it's really
difficult to delete it : must change the state of the parent volume and
the snapshot to available. And for that, you need to be admin.
So, if someone manage to find a good way to handle fast snapshots, and
be able to revert an instance back, please share !
I use Kilo (prod) and Liberty (test), GlusterFS as storage for my KVM
region, VMware for a second region.
--
GillesMo
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