For quite some time, Ceph has an admin API. This article demonstrates and gives some hints to monitor Ceph.
Check health status:
$ curl localhost:5000/api/v0.1/health
HEALTH_OK
OSD tree:
$ curl localhost:5000/api/v0.1/osd/tree
# id weight type name up/down reweight
-1 2 root default
-4 2 datacenter dc
-5 2 room laroom
-6 2 row larow
-3 2 rack lerack
-2 2 host ceph
0 1 osd.0 up 1
1 1 osd.1 up 1
OSD status:
$ curl localhost:5000/api/v0.1/osd/stat
osdmap e1371: 2 osds: 2 up, 2 in
Monitors status:
$ curl localhost:5000/api/v0.1/mon/stat
e3: 1 mons at {1=192.168.251.100:6790/0}, election epoch 1, quorum 0 1
$ curl localhost:5000/api/v0.1/mon_status
{"name":"1","rank":0,"state":"leader","election_epoch":1,"quorum":[0],"outside_quorum":[],"extra_probe_peers":[],"sync_provider":[],"monmap":{"epoch":3,"fsid":"1c13637d-6c6f-47e3-92ca-3687f9cf9b52","modified":"2013-03-15 16:47:55.482545","created":"2013-03-11 10:33:18.021677","mons":[{"rank":0,"name":"1","addr":"192.168.251.100:6790\/0"}]}}
For a complete API overview please look at: http://dmsimard.com/2014/01/01/documentation-for-ceph-rest-api/