NAME

       ceph-mon - ceph monitor daemon

SYNOPSIS

       ceph-mon -i monid [ --mon-data mondatapath ]

DESCRIPTION

       ceph-mon  is  the  cluster  monitor daemon for the Ceph distributed file system. One or more instances of
       ceph-mon form a Paxos part-time parliament cluster that provides extremely reliable and  durable  storage
       of cluster membership, configuration, and state.

       The  mondatapath  refers  to  a  directory  on  a  local file system storing monitor data. It is normally
       specified via the mon data option in the configuration file.

OPTIONS

       -f, --foreground
              Foreground: do not daemonize after startup (run in foreground). Do not generate a pid file. Useful
              when run via ceph-run(8).

       -d     Debug mode: like -f, but also send all log output to stderr.

       --setuser userorgid
              Set uid after starting.  If a username is specified, the user record is looked up to get a uid and
              a gid, and the gid is also set as well, unless --setgroup is also specified.

       --setgroup grouporgid
              Set gid after starting.  If a group name is specified the group record is looked up to get a gid.

       -c ceph.conf, --conf=ceph.conf
              Use ceph.conf configuration file instead of the default /etc/ceph/ceph.conf to  determine  monitor
              addresses during startup.

       --mkfs Initialize the mon data directory with seed information to form and initial ceph file system or to
              join an existing monitor cluster.  Three pieces of information must be provided:

              • The  cluster  fsid.   This  can  come  from  a monmap (--monmap <path>) or explicitly via --fsid
                <uuid>.

              • A list of monitors and their addresses.  This list of monitors can come from a monmap  (--monmap
                <path>),  the  mon  host  configuration  value (in ceph.conf or via -m host1,host2,...), or (for
                backward compatibility) the deprecated mon addr lines in ceph.conf.  If this monitor  is  to  be
                part  of  the  initial  monitor  quorum  for a new Ceph cluster, then it must be included in the
                initial list, matching either the name or address of a monitor in the list.   When  matching  by
                address, either the public addr or public subnet options may be used.

              • The  monitor  secret  key  mon..   This  must  be included in the keyring provided via --keyring
                <path>.

       --keyring
              Specify a keyring for use with --mkfs.

       --no-config-file
              Signal that we don't want to rely on a ceph.conf, either user provided or the default, to run  the
              daemon.  This will entail providing all necessary options to the daemon as arguments.

AVAILABILITY

       ceph-mon  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), ceph-mds(8), ceph-osd(8)

COPYRIGHT

       2010-2014, Inktank Storage, Inc. and contributors. Licensed  under  Creative  Commons  Attribution  Share
       Alike 3.0 (CC-BY-SA-3.0)

dev                                               May 22, 2025                                       CEPH-MON(8)