It's possible there's a bug in cephadm around placements where hosts have
the _no_schedule label. There was
https://tracker.ceph.com/issues/56972 recently
for an issue with how _no_schedule interacts with placements using explicit
hostnames. It might be something similar here where it thinks there's no
hosts matching the placement because all the matching hosts have the
_no_schedule label. I'd maybe try removing _no_schedule from one of the
hosts and see if the warning goes away.

On Tue, Aug 2, 2022 at 7:53 AM Carlos Mogas da Silva <r3...@r3pek.org>
wrote:

> Hi!
>
> I've followed [1] to add a keyring under management that would be deployed
> to my k8s cluster.
> I've also added the k8s cluster hosts with the "_no_schedule" and "k8s"
> label.
> ceph orch seems to know that everything is fine:
> # ceph orch host ls --label k8s
> HOST         ADDR      LABELS            STATUS
> k8s-master   10.1.0.4  _no_schedule k8s
> k8s-worker1  10.1.0.5  _no_schedule k8s
> k8s-worker2  10.1.0.6  _no_schedule k8s
> 3 hosts in cluster who had label k8s
>
> But on the ceph logs I'm getting this warnings:
> [WRN] unable to calc client keyring client.k8s placement
> PlacementSpec(label='k8s'): Cannot place :
> No matching hosts for label k8s
>
> Did I miss something?
>
> [1]
> https://docs.ceph.com/en/quincy/cephadm/operations/#client-keyrings-and-configs
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