On 10/15/2014 03:16 PM, Florian Haas wrote: > On Wed, Oct 15, 2014 at 7:20 PM, Russell Bryant <rbry...@redhat.com> wrote: > (4) Per-guest HA. > > This is the idea of just doing "nova boot --keep-this running", i.e. > setting a per-guest flag that still means the machine is to be kept up > at all times. Again, not supported in Nova right now, and probably > even more complex to implement generically than (3), at the same or > greater cost. > > I have a suggestion to tackle this that I *think* is reasonably > user-friendly while still bearable in terms of Nova development > effort: > > (a) Define a well-known metadata key for a host aggregate, say "ha". > Define that any host aggregate that represents a highly available > group of compute nodes should have this metadata key set. > > (b) Then define a flavor that sets extra_specs "ha=true". > > Granted, this places an additional burden on distro vendors to > integrate highly-available compute nodes into their deployment > infrastructure. But since practically all of them already include > Pacemaker, the additional scaffolding required is actually rather > limited. > > Am I making sense?
Yep, the downside is just that you need to provide a new set of flavors for "ha" vs "non-ha". A benefit though is that it's a way to support it today without *any* changes to OpenStack. This seems like the kind of thing we should also figure out how to offer on a per-guest basis without needing a new set of flavors. That's why I also listed the server tagging functionality as another possible solution. -- Russell Bryant _______________________________________________ OpenStack-dev mailing list OpenStack-dev@lists.openstack.org http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev
