ceph-mds – ceph metadata server daemon

Synopsis

ceph-mds -i <ID> [flags]

Description

ceph-mds is the metadata server daemon for the Ceph distributed filesystem. One or more instances of ceph-mds collectively manage the filesystem namespace, coordinating access to the shared OSD cluster.

Each ceph-mds daemon instance should have a unique name. The name is usedto identify daemon instances in the ceph.conf.

Once the daemon has started, the monitor cluster will normally assignit a logical rank, or put it in a standby pool to take over foranother daemon that crashes. Some of the specified options can causeother behaviors.

Options

• -f, —foreground
• Foreground: do not daemonize after startup (run in foreground). Donot 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 userrecord is looked up to get a uid and a gid, and the gid is also setas well, unless –setgroup is also specified.

• —setgroup grouporgid
• 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.

• -m monaddress[:port]
• Connect to specified monitor (instead of looking throughceph.conf).

• —id/-i ID
• Set ID portion of the MDS name.

Availability

ceph-mds is part of Ceph, a massively scalable, open-source, distributed storage system. Please refer to the Ceph documentation athttp://ceph.com/docs for more information.

See also

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