Hi Rob, I think it looks like a good option - but I'd like to see it exposed as such to the user rather than a change in the default behavior as such. I.e. "rebuild --keep-ephemenral=True ...."
Phil > -----Original Message----- > From: Robert Collins [mailto:robe...@robertcollins.net] > Sent: 28 October 2013 02:00 > To: OpenStack Development Mailing List; Russell Bryant; Joe Gordon > Subject: [openstack-dev] [Nova] Preserving ephemeral block device on > rebuild? > > For context, in TripleO we have precious state to preserve when we push > updates out to a cluster: nova instance volumes (obviously), swift data > stores, mysql db's etc. We have a long term plan to have a volume model and > interface that with Cinder, but thats an Ironic planed feature, and somewhat > down the track : in the short term we'd like to use the ephemeral volume for > such storage: it seems like 'nova rebuild' could easily be extended to > preserve the ephemeral block device. > > From a nova bm perspective, all that needs to happen is for us to /not/ > format the volume - simples - and we can do that in the current rebuild code > path where destroy + spawn is called, as long as we end up on the same > host. > > However, we'd like to support this for libvirt too, because that lets us test > workflows in virt rather than on purely baremetal (or emulated baremetal). > For that, it looks to me like we need to push rebuild down a layer to the virt > driver : so rather than destroy(); spawn(); have a > rebuild() method that takes the same data spawn would, and will be able to > preserve data as needed. > > Seeking thoughts on this - both the use of ephemeral in this way, and > sketched out code change - are sought! > > Thanks, > Rob > > -- > Robert Collins <rbtcoll...@hp.com> > Distinguished Technologist > HP Converged Cloud > > _______________________________________________ > OpenStack-dev mailing list > OpenStack-dev@lists.openstack.org > http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev _______________________________________________ OpenStack-dev mailing list OpenStack-dev@lists.openstack.org http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev