along the path you mentioned, it is fixed by changing the owner of
/var/lib/ceph to 167:167 from root. The cluster was deployed with non root
user, and files permission is in a bit of mess. After the change systemctl
daemon-reload and restart brings it up.
for another manager in bootstrap host,
in /var/lib/ceph// on the host with that mgr
reporting the error, there should be a unit.run file that shows what is
being done to start the mgr as well as a few files that get mounted into
the mgr on startup, notably the "config" and "keyring" files. That config
file should include the mon host
