NAME

       monmaptool - ceph monitor cluster map manipulation tool

SYNOPSIS

       monmaptool <action> [options] mapfilename

DESCRIPTION

       monmaptool  is  a  utility  to create, view, and modify a monitor cluster map for the Ceph
       distributed storage 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 for messenger protocol v1 is 6789, and 3300 for protocol v2.

       Multiple actions can be performed per invocation.

OPTIONS

       --print
              print a plaintext dump of the map, after any modifications are made.

       --feature-list [plain|parseable]
              list the enabled features as well as the available ones.

              By default, a human readable output is produced.

       --create
              create a new monitor map with a new UUID (and with it, a new, empty Ceph cluster).

       --clobber
              allow monmaptool to create a new mapfilename in place of an existing map.

              Only useful when --create is used.

       --generate
              generate  a  new monmap based on the values on the command line or specified in the
              ceph configuration.  This is, in order of preference,

                 1. --monmap filename to specify a monmap to load

                 2. --mon-host 'host1,ip2' to specify a list of hosts or ip addresses

                 3. [mon.foo] sections containing mon addr settings in the config. Note that this
                    method is not recommended and support will be removed in a future release.

       --filter-initial-members
              filter  the  initial  monmap by applying the mon initial members setting.  Monitors
              not present in that list will be removed, and initial members not  present  in  the
              map will be added with dummy addresses.

       --add name ip[:port]
              add a monitor with the specified ip:port to the map.

              If  the nautilus feature is set, and the port is not, the monitor will be added for
              both messenger protocols.

       --addv name [protocol:ip:port[,...]]
              add a monitor with the specified version:ip:port to the map.

       --rm name
              remove the monitor with the specified name from the map.

       --fsid uuid
              set the fsid to the given uuid.  If not specified with --create, a random fsid will
              be generated.

       --feature-set value [--optional|--persistent]
              enable a feature.

       --feature-unset value [--optional|--persistent]
              disable a feature.

       --enable-all-features
              enable all supported features.

       --set-min-mon-release release
              set the min_mon_release.

EXAMPLE

       To create a new map with three monitors (for a fresh Ceph cluster):

          monmaptool --create --add nodeA 192.168.0.10 --add nodeB 192.168.0.11 \
            --add nodeC 192.168.0.12 --enable-all-features --clobber monmap

       To display the contents of the map:

          monmaptool --print monmap

       To replace one monitor:

          monmaptool --rm nodeA monmap
          monmaptool --add nodeA 192.168.0.9 monmap

AVAILABILITY

       monmaptool is part of Ceph, a massively scalable, open-source, distributed storage system.
       Please refer to the Ceph documentation at https://docs.ceph.com for more information.

SEE ALSO

       ceph(8), crushtool(8),

COPYRIGHT

       2010-2023, Inktank  Storage,  Inc.  and  contributors.  Licensed  under  Creative  Commons
       Attribution Share Alike 3.0 (CC-BY-SA-3.0)