On 4/16/2017 10:35 PM, Alex Xu wrote:
Is it strange that the 'nova service-list' and 'nova host-list' return the hosts which didn't have host mapping yet?
It's kind of strange yes. We could probably make GET /os-hypervisors work without requiring the host mappings, but it just doesn't today because of some targeted calls within each cell to fill the response.
So we could probably decouple things a bit internally in the API if we wanted to do this differently and not require a host mapping, but for now I knew we could get the same results by just using os-services and get Kolla unblocked (this came up Friday morning last week so I was rushing for a solution).
How the user to know whether a host was added to a cell or not?
A user doesn't need to know, but an operator would care. This actually came up in IRC last week [1] when Kevin Fox was asking similar questions, and I have a TODO to write some FAQs for cells v2.
We talked about how the "nova-manage cell_v2 discover_hosts" command is idempotent and if there are new unmapped hosts you could just run it and pick them up - the trick is knowing when to run it, unless you configure the scheduler to use "discover_hosts_in_cells_interval" for auto-discovery.
We also talked about the option of building on the "nova-manage cell_v2 list_cells" command to also optionally dumping hosts per cell, or just run the "nova-manage host list" command pointed at your cell config.
At some point we might want to consider returning cell uuid out of the os-services API when listing services or hosts, something like that.
[1] http://eavesdrop.openstack.org/irclogs/%23openstack-nova/%23openstack-nova.2017-04-10.log.html#t2017-04-10T20:25:47
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