mirror of https://github.com/ceph/ceph
93 lines
2.5 KiB
ReStructuredText
93 lines
2.5 KiB
ReStructuredText
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=========================================
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ceph-mds -- ceph metadata server daemon
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=========================================
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.. program:: ceph-mds
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Synopsis
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========
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| **ceph-mds** -i *name* [[ --hot-standby [*rank*] ]|[--journal_check *rank*]]
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Description
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===========
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**ceph-mds** is the metadata server daemon for the Ceph distributed file
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system. One or more instances of ceph-mds collectively manage the file
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system namespace, coordinating access to the shared OSD cluster.
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Each ceph-mds daemon instance should have a unique name. The name is used
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to identify daemon instances in the ceph.conf.
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Once the daemon has started, the monitor cluster will normally assign
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it a logical rank, or put it in a standby pool to take over for
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another daemon that crashes. Some of the specified options can cause
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other behaviors.
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If you specify hot-standby or journal-check, you must either specify
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the rank on the command line, or specify one of the
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mds_standby_for_[rank|name] parameters in the config. The command
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line specification overrides the config, and specifying the rank
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overrides specifying the name.
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Options
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=======
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.. option:: -f, --foreground
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Foreground: do not daemonize after startup (run in foreground). Do
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not generate a pid file. Useful when run via :doc:`ceph-run
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<ceph-run>`\(8).
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.. option:: -d
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Debug mode: like ``-f``, but also send all log output to stderr.
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.. option:: --setuser userorgid
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Set uid after starting. If a username is specified, the user
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record is looked up to get a uid and a gid, and the gid is also set
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as well, unless --setgroup is also specified.
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.. option:: --setgroup grouporgid
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Set gid after starting. If a group name is specified the group
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record is looked up to get a gid.
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.. option:: -c ceph.conf, --conf=ceph.conf
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Use *ceph.conf* configuration file instead of the default
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``/etc/ceph/ceph.conf`` to determine monitor addresses during
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startup.
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.. option:: -m monaddress[:port]
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Connect to specified monitor (instead of looking through
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``ceph.conf``).
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.. option:: --journal-check <rank>
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Attempt to replay the journal for MDS <rank>, then exit.
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.. option:: --hot-standby <rank>
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Start as a hot standby for MDS <rank>.
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Availability
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============
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**ceph-mds** is part of Ceph, a massively scalable, open-source, distributed storage system. Please refer to the Ceph documentation at
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http://ceph.com/docs for more information.
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See also
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========
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:doc:`ceph <ceph>`\(8),
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:doc:`ceph-mon <ceph-mon>`\(8),
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:doc:`ceph-osd <ceph-osd>`\(8)
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