If you’ve recently removed a host and your cluster displays as being in an error state with the following error:
A daemon managed by cephadm is no longer active. Determine, which daemon is down with 'ceph health detail'. you may start daemons with the 'ceph orch daemon start '
cephadm is trying to connect to a host which has been removed. All that needs to be done is to disable and re-enable cephadm as follows:
cephadm shell
ceph mgr module disable cephadm
ceph mgr module enable cephadm
The error of cephadm not being able to connect to the removed host will no longer show.