mirror of
https://github.com/ceph/ceph
synced 2024-12-21 10:54:42 +00:00
454 lines
11 KiB
ReStructuredText
454 lines
11 KiB
ReStructuredText
.. index:: control, commands
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==================
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Control Commands
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==================
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Monitor Commands
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================
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Monitor commands are issued using the ceph utility::
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ceph [-m monhost] {command}
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The command is usually (though not always) of the form::
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ceph {subsystem} {command}
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System Commands
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===============
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Execute the following to display the current status of the cluster. ::
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ceph -s
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ceph status
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Execute the following to display a running summary of the status of the cluster,
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and major events. ::
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ceph -w
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Execute the following to show the monitor quorum, including which monitors are
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participating and which one is the leader. ::
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ceph quorum_status
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Execute the following to query the status of a single monitor, including whether
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or not it is in the quorum. ::
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ceph [-m monhost] mon_status
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Authentication Subsystem
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========================
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To add a keyring for an OSD, execute the following::
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ceph auth add {osd} {--in-file|-i} {path-to-osd-keyring}
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To list the cluster's keys and their capabilities, execute the following::
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ceph auth ls
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Placement Group Subsystem
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=========================
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To display the statistics for all placement groups, execute the following::
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ceph pg dump [--format {format}]
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The valid formats are ``plain`` (default) and ``json``.
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To display the statistics for all placement groups stuck in a specified state,
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execute the following::
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ceph pg dump_stuck inactive|unclean|stale|undersized|degraded [--format {format}] [-t|--threshold {seconds}]
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``--format`` may be ``plain`` (default) or ``json``
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``--threshold`` defines how many seconds "stuck" is (default: 300)
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**Inactive** Placement groups cannot process reads or writes because they are waiting for an OSD
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with the most up-to-date data to come back.
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**Unclean** Placement groups contain objects that are not replicated the desired number
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of times. They should be recovering.
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**Stale** Placement groups are in an unknown state - the OSDs that host them have not
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reported to the monitor cluster in a while (configured by
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``mon_osd_report_timeout``).
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Delete "lost" objects or revert them to their prior state, either a previous version
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or delete them if they were just created. ::
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ceph pg {pgid} mark_unfound_lost revert|delete
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OSD Subsystem
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=============
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Query OSD subsystem status. ::
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ceph osd stat
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Write a copy of the most recent OSD map to a file. See
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`osdmaptool`_. ::
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ceph osd getmap -o file
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.. _osdmaptool: ../../man/8/osdmaptool
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Write a copy of the crush map from the most recent OSD map to
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file. ::
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ceph osd getcrushmap -o file
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The foregoing functionally equivalent to ::
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ceph osd getmap -o /tmp/osdmap
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osdmaptool /tmp/osdmap --export-crush file
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Dump the OSD map. Valid formats for ``-f`` are ``plain`` and ``json``. If no
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``--format`` option is given, the OSD map is dumped as plain text. ::
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ceph osd dump [--format {format}]
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Dump the OSD map as a tree with one line per OSD containing weight
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and state. ::
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ceph osd tree [--format {format}]
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Find out where a specific object is or would be stored in the system::
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ceph osd map <pool-name> <object-name>
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Add or move a new item (OSD) with the given id/name/weight at the specified
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location. ::
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ceph osd crush set {id} {weight} [{loc1} [{loc2} ...]]
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Remove an existing item (OSD) from the CRUSH map. ::
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ceph osd crush remove {name}
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Remove an existing bucket from the CRUSH map. ::
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ceph osd crush remove {bucket-name}
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Move an existing bucket from one position in the hierarchy to another. ::
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ceph osd crush move {id} {loc1} [{loc2} ...]
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Set the weight of the item given by ``{name}`` to ``{weight}``. ::
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ceph osd crush reweight {name} {weight}
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Mark an OSD as lost. This may result in permanent data loss. Use with caution. ::
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ceph osd lost {id} [--yes-i-really-mean-it]
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Create a new OSD. If no UUID is given, it will be set automatically when the OSD
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starts up. ::
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ceph osd create [{uuid}]
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Remove the given OSD(s). ::
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ceph osd rm [{id}...]
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Query the current max_osd parameter in the OSD map. ::
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ceph osd getmaxosd
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Import the given crush map. ::
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ceph osd setcrushmap -i file
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Set the ``max_osd`` parameter in the OSD map. This is necessary when
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expanding the storage cluster. ::
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ceph osd setmaxosd
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Mark OSD ``{osd-num}`` down. ::
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ceph osd down {osd-num}
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Mark OSD ``{osd-num}`` out of the distribution (i.e. allocated no data). ::
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ceph osd out {osd-num}
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Mark ``{osd-num}`` in the distribution (i.e. allocated data). ::
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ceph osd in {osd-num}
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Set or clear the pause flags in the OSD map. If set, no IO requests
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will be sent to any OSD. Clearing the flags via unpause results in
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resending pending requests. ::
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ceph osd pause
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ceph osd unpause
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Set the weight of ``{osd-num}`` to ``{weight}``. Two OSDs with the
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same weight will receive roughly the same number of I/O requests and
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store approximately the same amount of data. ``ceph osd reweight``
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sets an override weight on the OSD. This value is in the range 0 to 1,
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and forces CRUSH to re-place (1-weight) of the data that would
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otherwise live on this drive. It does not change the weights assigned
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to the buckets above the OSD in the crush map, and is a corrective
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measure in case the normal CRUSH distribution is not working out quite
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right. For instance, if one of your OSDs is at 90% and the others are
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at 50%, you could reduce this weight to try and compensate for it. ::
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ceph osd reweight {osd-num} {weight}
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Reweights all the OSDs by reducing the weight of OSDs which are
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heavily overused. By default it will adjust the weights downward on
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OSDs which have 120% of the average utilization, but if you include
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threshold it will use that percentage instead. ::
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ceph osd reweight-by-utilization [threshold]
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Describes what reweight-by-utilization would do. ::
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ceph osd test-reweight-by-utilization
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Adds/removes the address to/from the blacklist. When adding an address,
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you can specify how long it should be blacklisted in seconds; otherwise,
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it will default to 1 hour. A blacklisted address is prevented from
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connecting to any OSD. Blacklisting is most often used to prevent a
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lagging metadata server from making bad changes to data on the OSDs.
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These commands are mostly only useful for failure testing, as
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blacklists are normally maintained automatically and shouldn't need
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manual intervention. ::
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ceph osd blacklist add ADDRESS[:source_port] [TIME]
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ceph osd blacklist rm ADDRESS[:source_port]
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Creates/deletes a snapshot of a pool. ::
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ceph osd pool mksnap {pool-name} {snap-name}
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ceph osd pool rmsnap {pool-name} {snap-name}
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Creates/deletes/renames a storage pool. ::
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ceph osd pool create {pool-name} pg_num [pgp_num]
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ceph osd pool delete {pool-name} [{pool-name} --yes-i-really-really-mean-it]
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ceph osd pool rename {old-name} {new-name}
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Changes a pool setting. ::
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ceph osd pool set {pool-name} {field} {value}
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Valid fields are:
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* ``size``: Sets the number of copies of data in the pool.
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* ``pg_num``: The placement group number.
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* ``pgp_num``: Effective number when calculating pg placement.
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* ``crush_ruleset``: rule number for mapping placement.
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Get the value of a pool setting. ::
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ceph osd pool get {pool-name} {field}
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Valid fields are:
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* ``pg_num``: The placement group number.
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* ``pgp_num``: Effective number of placement groups when calculating placement.
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* ``lpg_num``: The number of local placement groups.
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* ``lpgp_num``: The number used for placing the local placement groups.
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Sends a scrub command to OSD ``{osd-num}``. To send the command to all OSDs, use ``*``. ::
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ceph osd scrub {osd-num}
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Sends a repair command to OSD.N. To send the command to all OSDs, use ``*``. ::
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ceph osd repair N
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Runs a simple throughput benchmark against OSD.N, writing ``TOTAL_DATA_BYTES``
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in write requests of ``BYTES_PER_WRITE`` each. By default, the test
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writes 1 GB in total in 4-MB increments.
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The benchmark is non-destructive and will not overwrite existing live
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OSD data, but might temporarily affect the performance of clients
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concurrently accessing the OSD. ::
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ceph tell osd.N bench [TOTAL_DATA_BYTES] [BYTES_PER_WRITE]
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MDS Subsystem
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=============
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Change configuration parameters on a running mds. ::
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ceph tell mds.{mds-id} injectargs --{switch} {value} [--{switch} {value}]
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Example::
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ceph tell mds.0 injectargs --debug_ms 1 --debug_mds 10
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Enables debug messages. ::
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ceph mds stat
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Displays the status of all metadata servers. ::
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ceph mds fail 0
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Marks the active MDS as failed, triggering failover to a standby if present.
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.. todo:: ``ceph mds`` subcommands missing docs: set, dump, getmap, stop, setmap
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Mon Subsystem
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=============
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Show monitor stats::
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ceph mon stat
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e2: 3 mons at {a=127.0.0.1:40000/0,b=127.0.0.1:40001/0,c=127.0.0.1:40002/0}, election epoch 6, quorum 0,1,2 a,b,c
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The ``quorum`` list at the end lists monitor nodes that are part of the current quorum.
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This is also available more directly::
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ceph quorum_status -f json-pretty
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.. code-block:: javascript
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{
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"election_epoch": 6,
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"quorum": [
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0,
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1,
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2
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],
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"quorum_names": [
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"a",
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"b",
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"c"
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],
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"quorum_leader_name": "a",
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"monmap": {
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"epoch": 2,
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"fsid": "ba807e74-b64f-4b72-b43f-597dfe60ddbc",
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"modified": "2016-12-26 14:42:09.288066",
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"created": "2016-12-26 14:42:03.573585",
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"features": {
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"persistent": [
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"kraken"
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],
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"optional": []
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},
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"mons": [
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{
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"rank": 0,
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"name": "a",
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"addr": "127.0.0.1:40000\/0",
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"public_addr": "127.0.0.1:40000\/0"
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},
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{
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"rank": 1,
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"name": "b",
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"addr": "127.0.0.1:40001\/0",
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"public_addr": "127.0.0.1:40001\/0"
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},
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{
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"rank": 2,
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"name": "c",
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"addr": "127.0.0.1:40002\/0",
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"public_addr": "127.0.0.1:40002\/0"
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}
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]
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}
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}
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The above will block until a quorum is reached.
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For a status of just the monitor you connect to (use ``-m HOST:PORT``
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to select)::
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ceph mon_status -f json-pretty
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.. code-block:: javascript
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{
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"name": "b",
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"rank": 1,
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"state": "peon",
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"election_epoch": 6,
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"quorum": [
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0,
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1,
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2
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],
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"features": {
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"required_con": "9025616074522624",
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"required_mon": [
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"kraken"
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],
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"quorum_con": "1152921504336314367",
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"quorum_mon": [
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"kraken"
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]
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},
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"outside_quorum": [],
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"extra_probe_peers": [],
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"sync_provider": [],
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"monmap": {
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"epoch": 2,
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"fsid": "ba807e74-b64f-4b72-b43f-597dfe60ddbc",
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"modified": "2016-12-26 14:42:09.288066",
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"created": "2016-12-26 14:42:03.573585",
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"features": {
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"persistent": [
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"kraken"
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],
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"optional": []
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},
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"mons": [
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{
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"rank": 0,
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"name": "a",
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"addr": "127.0.0.1:40000\/0",
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"public_addr": "127.0.0.1:40000\/0"
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},
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{
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"rank": 1,
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"name": "b",
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"addr": "127.0.0.1:40001\/0",
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"public_addr": "127.0.0.1:40001\/0"
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},
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{
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"rank": 2,
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"name": "c",
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"addr": "127.0.0.1:40002\/0",
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"public_addr": "127.0.0.1:40002\/0"
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}
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]
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}
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}
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A dump of the monitor state::
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ceph mon dump
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dumped monmap epoch 2
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epoch 2
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fsid ba807e74-b64f-4b72-b43f-597dfe60ddbc
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last_changed 2016-12-26 14:42:09.288066
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created 2016-12-26 14:42:03.573585
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0: 127.0.0.1:40000/0 mon.a
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1: 127.0.0.1:40001/0 mon.b
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2: 127.0.0.1:40002/0 mon.c
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