ceph-mon – ceph monitor daemon

    ceph-mon is the cluster monitor daemon for the Ceph distributedfile system. One or more instances of ceph-mon form a Paxospart-time parliament cluster that provides extremely reliable anddurable storage of cluster membership, configuration, and state.

    The mondatapath refers to a directory on a local file system storingmonitor data. It is normally specified via the option inthe configuration file.

    • -f, —foreground
    • Foreground: do not daemonize after startup (run in foreground). Donot generate a pid file. Useful when run via (8).
    • Debug mode: like -f, but also send all log output to stderr.
    • —setuser userorgid
    • Set uid after starting. If a username is specified, the userrecord is looked up to get a uid and a gid, and the gid is also setas well, unless –setgroup is also specified.
    • —setgroup
    • Set gid after starting. If a group name is specified the grouprecord 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 duringstartup.

      • The cluster fsid. This can come from a monmap (—monmap <path>) orexplicitly via —fsid <uuid>.

      • A list of monitors and their addresses. This list of monitorscan come from a monmap (), the mon hostconfiguration value (in ceph.conf or via -mhost1,host2,…), or (for backward compatibility) the deprecated mon addr lines in ceph.conf. If thismonitor is to be part of the initial monitor quorum for a newCeph 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 publicsubnet options may be used.

    • —keyring
    • Specify a keyring for use with —mkfs.
    • —no-config-file

    ceph-mon is part of Ceph, a massively scalable, open-source, distributed storage system. Please referto the Ceph documentation at for moreinformation.

    ceph(8),(8),ceph-osd(8)