Am 24.10.2018 um 12:26 schrieb John Spray: > On Wed, Oct 24, 2018 at 12:09 AM Sage Weil <sweil@xxxxxxxxxx> wrote: >> >> >> 3) Delegate this to the new orchestrator. Kube can just run this command >> wherever we want. Ansible presumably can too. > > I agree with Kai and Jan that this is the way to go. > > Using the libstoragemgmt network service is still possible, it would > just be an implementation detail for the orchestrator itself. I can > imagine that in some future container environments, deploying > something like the libstoragemgmt network service becomes quite > cheap/easy, and saves the effort of tools like Rook implementing their > own agent hooks -- but Ceph won't care. > > This would be an area where we need to get the orchestrator's device > names in line with Ceph's internal device naming -- that would be > useful anyway for other orchestrator functionality. Yes. As the OSD may no longer be running, and thus out of reach for Ceph, we should to use the orchestrator for that. > >> 4) Depend on the libstoragemgmt network service. nmcli is just one part >> of the suite... there's also a REST API that lets you do stuff. There are >> presumably certificates to configure and such to make it all work, though. >> >> Also, there are some implementation oddities. The on/off state source >> of truth is the enclosure itself. So if you turn the light off in ceph, >> we need to be certain we turned it off with the device before we clear out >> our state. Maybe we have states like off, pending-on, on, pending-off, >> and we don't transition from pending-foo to foo until we get a success >> from the command that is supposed to toggle the light state. > > I'd be inclined to just make the command synchronous, and return an > error if the host is unreachable (perhaps with a special force flag to > clear out Ceph's state if the host is gone and never coming back). > > John > >> >> Thoughts? I think this is within striking distance (finally) and it would >> be sweet to land it in nautilus! >> >> sage > -- SUSE Linux GmbH, GF: Felix Imendörffer, Jane Smithard, Graham Norton, HRB 21284 (AG Nürnberg)
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