3 =========================================
4 ceph-mds -- ceph metadata server daemon
5 =========================================
12 | **ceph-mds** -i *name* [ --hot-standby [*rank*] ]
18 **ceph-mds** is the metadata server daemon for the Ceph distributed file
19 system. One or more instances of ceph-mds collectively manage the file
20 system namespace, coordinating access to the shared OSD cluster.
22 Each ceph-mds daemon instance should have a unique name. The name is used
23 to identify daemon instances in the ceph.conf.
25 Once the daemon has started, the monitor cluster will normally assign
26 it a logical rank, or put it in a standby pool to take over for
27 another daemon that crashes. Some of the specified options can cause
30 If you specify hot-standby, you must either specify the rank on the command
31 line, or specify one of the mds_standby_for_[rank|name] parameters in the
32 config. The command line specification overrides the config, and specifying
33 the rank overrides specifying the name.
39 .. option:: -f, --foreground
41 Foreground: do not daemonize after startup (run in foreground). Do
42 not generate a pid file. Useful when run via :doc:`ceph-run
47 Debug mode: like ``-f``, but also send all log output to stderr.
49 .. option:: --setuser userorgid
51 Set uid after starting. If a username is specified, the user
52 record is looked up to get a uid and a gid, and the gid is also set
53 as well, unless --setgroup is also specified.
55 .. option:: --setgroup grouporgid
57 Set gid after starting. If a group name is specified the group
58 record is looked up to get a gid.
60 .. option:: -c ceph.conf, --conf=ceph.conf
62 Use *ceph.conf* configuration file instead of the default
63 ``/etc/ceph/ceph.conf`` to determine monitor addresses during
66 .. option:: -m monaddress[:port]
68 Connect to specified monitor (instead of looking through
71 .. option:: --hot-standby <rank>
73 Start as a hot standby for MDS <rank>.
78 **ceph-mds** is part of Ceph, a massively scalable, open-source, distributed storage system. Please refer to the Ceph documentation at
79 http://ceph.com/docs for more information.
85 :doc:`ceph <ceph>`\(8),
86 :doc:`ceph-mon <ceph-mon>`\(8),
87 :doc:`ceph-osd <ceph-osd>`\(8)