title: ceph health command returns a failure
body: <p>i'm new to ceph but have to build a mini-cluster as part of a project, i have been following an online tutorial of how to build one and all was fine until i restarted my machines the following day. now when i perform the command ceph health it returns an error saying: 2015-01-08 15:35:04.037375 7fae717fa700  0 -- :/1003525 >> 192.168.1.12:6789/0 pipe(0x7fae6c000c00 sd=3 :0 s=1 pgs=0 cs=0 l=1 c=0x7fae6c000e90).fault.</p>
  
  <p>and whenever i run the same command on the 192.168.1.12 machine it returns an error saying: monclient(hunting): ERROR: missing keyring, cannot use cephx for authentication.
  0 librados: client.admin initialization error (2) No such file or directory. Error connecting to cluster: ObjectNotFound.</p>
  
  <p>I have been searching the internet for a while now for any answers and not found much, i noticed this site tends to be good in answering most if not all questions though, so any help would be greatly appreciated thanks. Im using centos 7 on all machines if thats any help.</p>