If you want to change or rebuild a new set of monitor servers, you will need to manipulate the monmap. This monmap is exchange between every monitors.
First get your current monmap whithout any changes:
$ ceph mon getmap -o /tmp/monmap
got latest monmap
$ monmaptool --print /tmp/monmap
monmaptool: monmap file /tmp/monmap
epoch 1
fsid dea89929-963c-4173-9eaf-8e832d6d9dd1
last_changed 2012-07-01 17:10:16.085277
created 2012-07-01 17:10:16.085277
0: 192.168.146.195:6789/0 mon.0
1: 192.168.146.196:6789/0 mon.1
2: 192.168.146.197:6789/0 mon.2
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Now create a new one, just be sure to use the same fsid as your current monmap:
$ monmaptool --create --add mon.1 10.0.1.1:6789 --add mon.2 10.0.1.2:6789 --add mon.3 10.0.1.3:6789 --fsid dea89929-963c-4173-9eaf-8e832d6d9dd1 --clobber monmap
monmaptool: monmap file monmap
monmaptool: set fsid to dea89929-963c-4173-9eaf-8e832d6d9dd1
monmaptool: writing epoch 0 to monmap (3 monitors)
$ monmaptool --print monmap
monmaptool: monmap file monmap
epoch 0
fsid dea89929-963c-4173-9eaf-8e832d6d9dd1
last_changed 2012-07-27 01:18:43.321681
created 2012-07-27 01:18:43.321681
0: 10.0.1.1:6789/0 mon.mon.1
1: 10.0.1.2:6789/0 mon.mon.2
2: 10.0.1.3:6789/0 mon.mon.3
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W DON’T PLAY WITH THE MONITOR WITH A PRODUCTION CLUSTER
After that, you can run your mkcephfs, Chef or Puppet!
K Reference links:
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