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

Ceph metadata server daemon.

May 19, 2020


ceph-mds - ceph metadata server daemon


ceph-mds -i name [ --hot-standby [rank] ]


ceph-mds is the metadata server daemon for the Ceph distributed file system. One or more instances of ceph-mds collectively manage the file system namespace, coordinating access to the shared OSD cluster. Each ceph-mds daemon instance should have a unique name. The name is used to identify dae‐ mon instances in the ceph.conf. Once the daemon has started, the monitor cluster will normally assign it a logical rank, or put it in a standby pool to take over for another daemon that crashes. Some of the specified options can cause other behaviors. If you specify hot-standby, you must either specify the rank on the command line, or spec‐ ify one of the mds_standby_for_[rank|name] parameters in the config. The command line specification overrides the config, and specifying the rank overrides specifying the name.


-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. -m monaddress[:port] Connect to specified monitor (instead of looking through ceph.conf). --hot-standby <rank> Start as a hot standby for MDS <rank>.


ceph-mds 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-mon(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-MDS(8)
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ceph-mds(8) referred by ceph(8) | ceph-mon(8) | ceph-osd(8) | ceph-run(8)
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