Ceph » RADOS

On 7148b7c3ae254fbc7796ae63d86ea681c68e0d88

Add 'log_to_file = true' to ceph.conf

# /ceph/build/bin/ceph-mon -i a --setuser ceph --setgroup ceph -c /ceph/build/ceph.conf
2020-12-14 01:15:26.041 7fcd5be541c0 -1 WARNING: all dangerous and experimental features are enabled.
2020-12-14 01:15:26.041 7fcd5be541c0 -1 WARNING: all dangerous and experimental features are enabled.
2020-12-14 01:15:26.077 7fcd5be541c0 -1 WARNING: all dangerous and experimental features are enabled.
2020-12-14 01:15:26.077 7fcd5be541c0 -1 asok(0x557ef94d6000) AdminSocketConfigObs::init: failed: AdminSocket::bind_and_listen: failed to bind the UNIX domain socket to '/tmp/ceph-asok.vXyP1B/mon.a.asok': (13) Permission denied

# ls -l out/mon.a.log
-rw-r--r-- 1 ceph ceph 205342 Dec 14 01:20 out/mon.a.log

Start the mon as root to get around the socket permission problem so the manager will start.

# /ceph/build/bin/ceph-mon -i a -c /ceph/build/ceph.conf
2020-12-14 01:19:31.513 7f9d681091c0 -1 WARNING: all dangerous and experimental features are enabled.
2020-12-14 01:19:31.513 7f9d681091c0 -1 WARNING: all dangerous and experimental features are enabled.
2020-12-14 01:19:31.548 7f9d681091c0 -1 WARNING: all dangerous and experimental features are enabled.

# /ceph/build/bin/ceph-mgr -i x --setuser ceph --setgroup ceph -c /ceph/build/ceph.conf
2020-12-14 01:20:07.886 7f92821c2e40 -1 WARNING: all dangerous and experimental features are enabled.
2020-12-14 01:20:07.925 7f92821c2e40 -1 WARNING: all dangerous and experimental features are enabled.

# ls -l out/mgr.x.log 
-rw-r--r-- 1 root root 4685 Dec 14 01:20 out/mgr.x.log

This was resolved in octopus by accident with https://github.com/ceph/ceph/commit/02c0a20a09fc8f678d0f9caf7f580b3dbc1f0f91