1CEPH-MON(8)                          Ceph                          CEPH-MON(8)
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NAME

6       ceph-mon - ceph monitor daemon
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SYNOPSIS

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

13       ceph-mon  is  the  cluster monitor daemon for the Ceph distributed file
14       system. One or more instances of ceph-mon form a Paxos  part-time  par‐
15       liament cluster that provides extremely reliable and durable storage of
16       cluster membership, configuration, and state.
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18       The mondatapath refers to a directory on a local  file  system  storing
19       monitor  data.  It is normally specified via the mon data option in the
20       configuration file.
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OPTIONS

23       -f, --foreground
24              Foreground: do not daemonize after startup (run in  foreground).
25              Do not generate a pid file. Useful when run via ceph-run(8).
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27       -d     Debug mode: like -f, but also send all log output to stderr.
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29       --setuser userorgid
30              Set  uid  after  starting.  If a username is specified, the user
31              record is looked up to get a uid and a gid, and the gid is  also
32              set as well, unless --setgroup is also specified.
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34       --setgroup grouporgid
35              Set  gid after starting.  If a group name is specified the group
36              record is looked up to get a gid.
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38       -c ceph.conf, --conf=ceph.conf
39              Use  ceph.conf  configuration  file  instead  of   the   default
40              /etc/ceph/ceph.conf   to   determine  monitor  addresses  during
41              startup.
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43       --mkfs Initialize the mon data directory with seed information to  form
44              and  initial  ceph  file  system  or to join an existing monitor
45              cluster.  Three pieces of information must be provided:
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47              • The cluster fsid.  This  can  come  from  a  monmap  (--monmap
48                <path>) or explicitly via --fsid <uuid>.
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50              • A list of monitors and their addresses.  This list of monitors
51                can come from a monmap (--monmap <path>), the mon host config‐
52                uration  value  (in  ceph.conf  or via -m host1,host2,...), or
53                (for backward compatibility) the deprecated mon addr lines  in
54                ceph.conf.  If this monitor is to be part of the initial moni‐
55                tor quorum for a new Ceph cluster, then it must be included in
56                the  initial  list,  matching  either the name or address of a
57                monitor in the list.  When matching  by  address,  either  the
58                public addr or public subnet options may be used.
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60              • The  monitor  secret  key  mon..  This must be included in the
61                keyring provided via --keyring <path>.
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63       --keyring
64              Specify a keyring for use with --mkfs.
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66       --no-config-file
67              Signal that we don't want to rely on a  ceph.conf,  either  user
68              provided  or  the  default, to run the daemon.  This will entail
69              providing all necessary options to the daemon as arguments.
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AVAILABILITY

72       ceph-mon is part of Ceph, a massively scalable,  open-source,  distrib‐
73       uted  storage  system.  Please  refer  to  the  Ceph  documentation  at
74       https://docs.ceph.com for more information.
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SEE ALSO

77       ceph(8), ceph-mds(8), ceph-osd(8)
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80       2010-2023, Inktank Storage, Inc. and contributors. Licensed under  Cre‐
81       ative Commons Attribution Share Alike 3.0 (CC-BY-SA-3.0)
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86dev                              Nov 15, 2023                      CEPH-MON(8)
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