1CMDS(8) System Manager's Manual CMDS(8)
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6 cmds - ceph metadata server daemon
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9 cmds -i name [ --rank rank ] [ --shadow rank ]
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12 cmds is the metadata server daemon for the Ceph distributed file sys‐
13 tem. One or more instances of cmds collectively manage the file system
14 namespace, coordinating access to the shared OSD cluster.
15 Each cmds daemon instance should have a unique name. The name is used
17 to identify daemon instances in the ceph.conf.
18 Once the daemon has started, the monitor cluster will normally assign
20 it a logical rank, or put it in a standby pool to take over for another
21 daemon that crashes. If a specific rank may be optionally specified on
22 the command line, the daemon will be assigned that rank, or will be put
23 in a separate standby queue specifically for that rank.
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26 --mds rank
27 Start up as (or standby for) the given MDS rank. If not speci‐
28 fied, a rank will be assigned by the monitor cluster. --shadow
29 rank Shadow a the given MDS rank. The given MDS log will be
30 replayed, checking for recovery errors.
31 -D Debug mode: do not daemonize after startup (run in foreground)
33 and send log output to stdout.
34 -f do not daemonize after startup (run in foreground), but log to
36 the usual location. Useful when run via crun(8).
37 -c ceph.conf, --conf=ceph.conf
39 Use ceph.conf configuration file instead of the default
40 /etc/ceph/ceph.conf to determine monitor addresses during
41 startup.
42 -m monaddress[:port]
44 Connect to specified monitor (instead of looking through
45 ceph.conf).
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48 cmon is part of the Ceph distributed file system. Please refer to the
49 Ceph wiki at http://ceph.newdream.net/wiki for more information.
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52 ceph(8), cmon(8), cosd(8)
53 CMDS(8)