.. program:: monmaptool
monmaptool is a utility to create, view, and modify a monitor cluster map for the Ceph distributed file system. The monitor map specifies the only fixed addresses in the Ceph distributed system. All other daemons bind to arbitrary addresses and register themselves with the monitors.
When creating a map with --create, a new monitor map with a new, random UUID will be created. It should be followed by one or more monitor addresses.
The default Ceph monitor port is 6789.
.. option:: --print will print a plaintext dump of the map, after any modifications are made.
.. option:: --clobber will allow monmaptool to overwrite mapfilename if changes are made.
.. option:: --create will create a new monitor map with a new UUID (and with it, a new, empty Ceph file system).
.. option:: --add name ip:port will add a monitor with the specified ip:port to the map.
.. option:: --rm name
will remove the monitor with the specified ip:port from the map.
To create a new map with three monitors (for a fresh Ceph file system):
monmaptool --create --add mon.a 192.168.0.10:6789 --add mon.b 192.168.0.11:6789 \ --add mon.c 192.168.0.12:6789 --clobber monmap
To display the contents of the map:
monmaptool --print onmap
To replace one monitor:
monmaptool --rm mon.a --add mon.a 192.168.0.9:6789 --clobber monmap
monmaptool is part of the Ceph distributed file system. Please refer to the Ceph wiki at http://ceph.newdream.net/wiki for more information.
:doc:`ceph <ceph>`(8), :doc:`crushtool <crushtool>`(8), :doc:`mkcephfs <mkcephfs>`(8)