CEPH-MON(8) - Linux man page online | Administration and privileged commands

Ceph monitor daemon.

May 19, 2020


ceph-mon - ceph monitor daemon


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


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.


-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 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.


ceph-mon is part of Ceph, a massively scalable, open-source, distributed storage system. Please refer to the Ceph documentation at for more information.


ceph(8), ceph-mds(8), ceph-osd(8)
2010-2020, Inktank Storage, Inc. and contributors. Licensed under Creative Commons Attri‐ bution Share Alike 3.0 (CC-BY-SA-3.0)
dev May 19, 2020 CEPH-MON(8)
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ceph-mon(8) referred by ceph(8) | ceph-mds(8) | ceph-osd(8) | ceph-run(8) | mount.ceph(8)
refer to ceph(8) | ceph-mds(8) | ceph-osd(8) | ceph-run(8)
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