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+.. index:: control, commands
+
+==================
+ Control Commands
+==================
+
+
+Monitor Commands
+================
+
+Monitor commands are issued using the ceph utility::
+
+	ceph [-m monhost] {command}
+
+The command is usually (though not always) of the form::
+
+	ceph {subsystem} {command}
+
+
+System Commands
+===============
+
+Execute the following to display the current status of the cluster.  ::
+
+	ceph -s
+	ceph status
+
+Execute the following to display a running summary of the status of the cluster,
+and major events. ::
+
+	ceph -w
+
+Execute the following to show the monitor quorum, including which monitors are
+participating and which one is the leader. ::
+
+	ceph quorum_status
+
+Execute the following to query the status of a single monitor, including whether
+or not it is in the quorum. ::
+
+	ceph [-m monhost] mon_status
+
+
+Authentication Subsystem
+========================
+
+To add a keyring for an OSD, execute the following::
+
+	ceph auth add {osd} {--in-file|-i} {path-to-osd-keyring}
+
+To list the cluster's keys and their capabilities, execute the following::
+
+	ceph auth list
+
+
+Placement Group Subsystem
+=========================
+
+To display the statistics for all placement groups, execute the following:: 
+
+	ceph -- pg dump [--format {format}]
+
+The valid formats are ``plain`` (default) and ``json``.
+
+To display the statistics for all placement groups stuck in a specified state, 
+execute the following:: 
+
+	ceph -- pg dump_stuck inactive|unclean|stale [--format {format}] [-t|--threshold {seconds}]
+
+
+``--format`` may be ``plain`` (default) or ``json``
+
+``--threshold`` defines how many seconds "stuck" is (default: 300)
+
+**Inactive** Placement groups cannot process reads or writes because they are waiting for an OSD
+with the most up-to-date data to come back.
+
+**Unclean** Placement groups contain objects that are not replicated the desired number
+of times. They should be recovering.
+
+**Stale** Placement groups are in an unknown state - the OSDs that host them have not
+reported to the monitor cluster in a while (configured by
+``mon_osd_report_timeout``).
+
+Revert "lost" objects to their prior state, either a previous version
+or delete them if they were just created. ::
+
+	ceph pg {pgid} mark_unfound_lost revert
+
+
+OSD Subsystem
+=============
+
+Query osd subsystem status. ::
+
+	ceph osd stat
+
+Write a copy of the most recent osd map to a file. See
+`osdmaptool`_. ::
+
+	ceph osd getmap -o file
+
+.. _osdmaptool: ../man/8/osdmaptool
+
+Write a copy of the crush map from the most recent osd map to
+file. ::
+
+	ceph osd getcrushmap -o file
+
+The foregoing functionally equivalent to ::
+
+	ceph osd getmap -o /tmp/osdmap
+	osdmaptool /tmp/osdmap --export-crush file
+
+Dump the OSD map. Valid formats for ``-f`` are ``plain`` and ``json``. If no
+``--format`` option is given, the OSD map is dumped as plain text. ::
+
+	ceph osd dump [--format {format}]
+
+Dump the OSD map as a tree with one line per OSD containing weight
+and state. ::
+
+	ceph osd tree [--format {format}]
+
+Add or move a new item (OSD) with the given id/name/weight at the specified
+location. ::
+
+	ceph osd crush set {id} {name} {weight} [{loc1} [{loc2} ...]]
+
+Remove an existing item from the CRUSH map. ::
+
+	ceph osd crush remove {id}
+
+Move an existing bucket from one position in the hierarchy to another.  ::
+
+   ceph osd crush move {id} {loc1} [{loc2} ...]
+
+Set the weight of the item given by ``{name}`` to ``{weight}``. ::
+
+	ceph osd crush reweight {name} {weight}
+
+Create a cluster snapshot. ::
+
+	ceph osd cluster_snap {name}
+
+Mark an OSD as lost. This may result in permanent data loss. Use with caution. ::
+
+	ceph osd lost [--yes-i-really-mean-it]
+
+Create a new OSD. If no ID is given, a new ID is automatically selected
+if possible. ::
+
+	ceph osd create [{id}]
+
+Remove the given OSD(s). ::
+
+	ceph osd rm [{id}...]
+
+Query the current max_osd parameter in the osd map. ::
+
+	ceph osd getmaxosd
+
+Import the given OSD map. Note that this can be a bit dangerous,
+since the OSD map includes dynamic state about which OSDs are current
+on or offline; only do this if you've just modified a (very) recent
+copy of the map. ::
+
+	ceph osd setmap -i file
+
+Import the given crush map. ::
+
+	ceph osd setcrushmap -i file
+
+Set the ``max_osd`` parameter in the OSD map. This is necessary when
+expanding the storage cluster. ::
+
+	ceph osd setmaxosd
+
+Mark OSD ``{osd-num}`` down. ::
+
+	ceph osd down {osd-num}
+
+Mark OSD ``{osd-num}`` out of the distribution (i.e. allocated no data). ::
+
+	ceph osd out {osd-num}
+
+Mark ``{osd-num}`` in the distribution (i.e. allocated data). ::
+
+	ceph osd in {osd-num}
+
+List classes that are loaded in the ceph cluster. ::
+
+	ceph class list
+
+Set or clear the pause flags in the OSD map. If set, no IO requests
+will be sent to any OSD. Clearing the flags via unpause results in
+resending pending requests. ::
+
+	ceph osd pause
+	ceph osd unpause
+
+Set the weight of ``{osd-num}`` to ``{weight}``. Two OSDs with the same weight will receive
+roughly the same number of I/O requests and store approximately the
+same amount of data. ::
+
+	ceph osd reweight {osd-num} {weight}
+
+Reweights all the OSDs by reducing the weight of OSDs which are
+heavily overused. By default it will adjust the weights downward on
+OSDs which have 120% of the average utilization, but if you include
+threshold it will use that percentage instead. ::
+
+	ceph osd reweight-by-utilization [threshold]
+
+Adds/removes the address to/from the blacklist. When adding an address,
+you can specify how long it should be blacklisted in seconds; otherwise,
+it will default to 1 hour. A blacklisted address is prevented from
+connecting to any OSD. Blacklisting is most often used to prevent a
+lagging metadata server from making bad changes to data on the OSDs.
+
+These commands are mostly only useful for failure testing, as
+blacklists are normally maintained automatically and shouldn't need
+manual intervention. ::
+
+	ceph osd blacklist add ADDRESS[:source_port] [TIME]
+	ceph osd blacklist rm ADDRESS[:source_port]
+
+Creates/deletes a snapshot of a pool. ::
+
+	ceph osd pool mksnap {pool-name} {snap-name}
+	ceph osd pool rmsnap {pool-name} {snap-name}
+
+Creates/deletes/renames a storage pool. ::
+
+	ceph osd pool create {pool-name} [pg_num [pgp_num]]
+	ceph osd pool delete {pool-name}
+   ceph osd pool rename {old-name} {new-name}
+
+Changes a pool setting. :: 
+
+	ceph osd pool set {pool-name} {field} {value}
+
+Valid fields are:
+
+	* ``size``: Sets the number of copies of data in the pool.
+	* ``crash_replay_interval``: The number of seconds to allow
+	  clients to replay acknowledged but uncommited requests.
+	* ``pg_num``: The placement group number.
+	* ``pgp_num``: Effective number when calculating pg placement.
+	* ``crush_ruleset``: rule number for mapping placement.
+
+Get the value of a pool setting. ::
+
+	ceph osd pool get {pool-name} {field}
+
+Valid fields are:
+
+	* ``pg_num``: The placement group number.
+	* ``pgp_num``: Effective number of placement groups when calculating placement.
+	* ``lpg_num``: The number of local placement groups.
+	* ``lpgp_num``: The number used for placing the local placement groups.
+
+
+Sends a scrub command to OSD ``{osd-num}``. To send the command to all OSDs, use ``*``. ::
+
+	ceph osd scrub {osd-num}
+
+Sends a repair command to osdN. To send the command to all osds, use ``*``. ::
+
+	ceph osd repair N
+
+Runs a simple throughput benchmark against osdN, writing ``TOTAL_BYTES``
+in write requests of ``BYTES_PER_WRITE`` each. By default, the test
+writes 1 GB in total in 4-MB increments. ::
+
+	ceph osd tell N bench [BYTES_PER_WRITE] [TOTAL_BYTES]
+
+
+MDS Subsystem
+-------------
+
+Change configuration parameters on a running mds. ::
+
+	ceph mds tell {mds-id} injectargs '--{switch} {value} [--{switch} {value}]'
+
+Example::
+
+	ceph mds tell 0 injectargs '--debug_ms 1 --debug_mds 10'
+
+Enables debug messages. ::
+
+	ceph mds stat
+
+Displays the status of all metadata servers.
+
+.. todo:: ``ceph mds`` subcommands missing docs: set_max_mds, dump, getmap, stop, setmap
+
+
+Mon Subsystem
+-------------
+
+Show monitor stats::
+
+	ceph mon stat
+	
+	2011-12-14 10:40:59.044395 mon {- [mon,stat]
+	2011-12-14 10:40:59.057111 mon.1 -} 'e3: 5 mons at {a=10.1.2.3:6789/0,b=10.1.2.4:6789/0,c=10.1.2.5:6789/0,d=10.1.2.6:6789/0,e=10.1.2.7:6789/0}, election epoch 16, quorum 0,1,2,3' (0)
+
+The ``quorum`` list at the end lists monitor nodes that are part of the current quorum.
+
+This is also available more directly::
+
+	$ ./ceph quorum_status
+	
+	2011-12-14 10:44:20.417705 mon {- [quorum_status]
+	2011-12-14 10:44:20.431890 mon.0 -} 
+
+.. code-block:: javascript	
+	
+	'{ "election_epoch": 10,	
+	  "quorum": [
+	        0,
+	        1,
+	        2],
+	  "monmap": { "epoch": 1,
+	      "fsid": "444b489c-4f16-4b75-83f0-cb8097468898",
+	      "modified": "2011-12-12 13:28:27.505520",
+	      "created": "2011-12-12 13:28:27.505520",
+	      "mons": [
+	            { "rank": 0,
+	              "name": "a",
+	              "addr": "127.0.0.1:6789\/0"},
+	            { "rank": 1,
+	              "name": "b",
+	              "addr": "127.0.0.1:6790\/0"},
+	            { "rank": 2,
+	              "name": "c",
+	              "addr": "127.0.0.1:6791\/0"}]}}' (0)
+
+The above will block until a quorum is reached.
+
+For a status of just the monitor you connect to (use ``-m HOST:PORT``
+to select)::
+
+	ceph mon_status
+	
+	
+	2011-12-14 10:45:30.644414 mon {- [mon_status]
+	2011-12-14 10:45:30.644632 mon.0 -} 
+
+.. code-block:: javascript
+	
+	'{ "name": "a",
+	  "rank": 0,
+	  "state": "leader",
+	  "election_epoch": 10,
+	  "quorum": [
+	        0,
+	        1,
+	        2],
+	  "outside_quorum": [],
+	  "monmap": { "epoch": 1,
+	      "fsid": "444b489c-4f16-4b75-83f0-cb8097468898",
+	      "modified": "2011-12-12 13:28:27.505520",
+	      "created": "2011-12-12 13:28:27.505520",
+	      "mons": [
+	            { "rank": 0,
+	              "name": "a",
+	              "addr": "127.0.0.1:6789\/0"},
+	            { "rank": 1,
+	              "name": "b",
+	              "addr": "127.0.0.1:6790\/0"},
+	            { "rank": 2,
+	              "name": "c",
+	              "addr": "127.0.0.1:6791\/0"}]}}' (0)
+
+A dump of the monitor state::
+
+	ceph mon dump
+
+	2011-12-14 10:43:08.015333 mon {- [mon,dump]
+	2011-12-14 10:43:08.015567 mon.0 -} 'dumped monmap epoch 1' (0)
+	epoch 1
+	fsid 444b489c-4f16-4b75-83f0-cb8097468898
+	last_changed 2011-12-12 13:28:27.505520
+	created 2011-12-12 13:28:27.505520
+	0: 127.0.0.1:6789/0 mon.a
+	1: 127.0.0.1:6790/0 mon.b
+	2: 127.0.0.1:6791/0 mon.c
+