Provided by: ceph-common_19.2.1-0ubuntu0.24.04.2_amd64 
NAME
ceph - ceph administration tool
SYNOPSIS
ceph auth [ add | caps | del | export | get | get-key | get-or-create | get-or-create-key | import | list | print-key | print_key ] ...
ceph compact
ceph config [ dump | ls | help | get | show | show-with-defaults | set | rm | log | reset | assimilate-conf | generate-minimal-conf ] ...
ceph config-key [ rm | exists | get | ls | dump | set ] ...
ceph daemon <name> | <path> <command> ...
ceph daemonperf <name> | <path> [ interval [ count ] ]
ceph df {detail}
ceph fs [ add_data_pool | authorize | dump | feature ls | flag set | get | ls | lsflags | new | rename | reset | required_client_features add | required_client_features rm | rm | rm_data_pool | set | swap ] ...
ceph fsid
ceph health {detail}
ceph injectargs <injectedargs> [ <injectedargs>... ]
ceph log <logtext> [ <logtext>... ]
ceph mds [ compat | fail | rm | rmfailed | set_state | stat | repaired ] ...
ceph mon [ add | dump | enable_stretch_mode | getmap | remove | stat ] ...
ceph osd [ blocklist | blocked-by | create | new | deep-scrub | df | down | dump | erasure-code-profile | find | getcrushmap | getmap | getmaxosd | in | ls | lspools | map | metadata | ok-to-stop | out | pause | perf | pg-temp | force-create-pg | primary-affinity | primary-temp | repair | reweight | reweight-by-pg | rm | destroy | purge | safe-to-destroy | scrub | set | setcrushmap | setmaxosd | stat | tree | unpause | unset ] ...
ceph osd crush [ add | add-bucket | create-or-move | dump | get-tunable | link | move | remove | rename-bucket | reweight | reweight-all | reweight-subtree | rm | rule | set | set-tunable | show-tunables | tunables | unlink ] ...
ceph osd pool [ create | delete | get | get-quota | ls | mksnap | rename | rmsnap | set | set-quota | stats ] ...
ceph osd pool application [ disable | enable | get | rm | set ] ...
ceph osd tier [ add | add-cache | cache-mode | remove | remove-overlay | set-overlay ] ...
ceph pg [ debug | deep-scrub | dump | dump_json | dump_pools_json | dump_stuck | getmap | ls | ls-by-osd | ls-by-pool | ls-by-primary | map | repair | scrub | stat ] ...
ceph quorum_status
ceph report { <tags> [ <tags>... ] }
ceph status
ceph sync force {--yes-i-really-mean-it} {--i-know-what-i-am-doing}
ceph tell <name (type.id)> <command> [options...]
ceph version
DESCRIPTION
ceph is a control utility which is used for manual deployment and maintenance of a Ceph cluster. It
provides a diverse set of commands that allows deployment of monitors, OSDs, placement groups, MDS and
overall maintenance, administration of the cluster.
COMMANDS
auth
Manage authentication keys. It is used for adding, removing, exporting or updating of authentication keys
for a particular entity such as a monitor or OSD. It uses some additional subcommands.
Subcommand add adds authentication info for a particular entity from input file, or random key if no
input is given and/or any caps specified in the command.
Usage:
ceph auth add <entity> {<caps> [<caps>...]}
Subcommand caps updates caps for name from caps specified in the command.
Usage:
ceph auth caps <entity> <caps> [<caps>...]
Subcommand del deletes all caps for name.
Usage:
ceph auth del <entity>
Subcommand export writes keyring for requested entity, or master keyring if none given.
Usage:
ceph auth export {<entity>}
Subcommand get writes keyring file with requested key.
Usage:
ceph auth get <entity>
Subcommand get-key displays requested key.
Usage:
ceph auth get-key <entity>
Subcommand get-or-create adds authentication info for a particular entity from input file, or random key
if no input given and/or any caps specified in the command.
Usage:
ceph auth get-or-create <entity> {<caps> [<caps>...]}
Subcommand get-or-create-key gets or adds key for name from system/caps pairs specified in the command.
If key already exists, any given caps must match the existing caps for that key.
Usage:
ceph auth get-or-create-key <entity> {<caps> [<caps>...]}
Subcommand import reads keyring from input file.
Usage:
ceph auth import
Subcommand ls lists authentication state.
Usage:
ceph auth ls
Subcommand print-key displays requested key.
Usage:
ceph auth print-key <entity>
Subcommand print_key displays requested key.
Usage:
ceph auth print_key <entity>
compact
Causes compaction of monitor's RocksDB storage.
Usage:
ceph compact
config
Configure the cluster. By default, Ceph daemons and clients retrieve their configuration options from
monitor when they start, and are updated if any of the tracked options is changed at run time. It uses
following additional subcommand.
Subcommand dump to dump all options for the cluster
Usage:
ceph config dump
Subcommand ls to list all option names for the cluster
Usage:
ceph config ls
Subcommand help to describe the specified configuration option
Usage:
ceph config help <option>
Subcommand get to dump the option(s) for the specified entity.
Usage:
ceph config get <who> {<option>}
Subcommand show to display the running configuration of the specified entity. Please note, unlike get,
which only shows the options managed by monitor, show displays all the configurations being actively
used. These options are pulled from several sources, for instance, the compiled-in default value, the
monitor's configuration database, ceph.conf file on the host. The options can even be overridden at
runtime. So, there is chance that the configuration options in the output of show could be different from
those in the output of get.
Usage:
ceph config show {<who>}
Subcommand show-with-defaults to display the running configuration along with the compiled-in defaults of
the specified entity
Usage:
ceph config show {<who>}
Subcommand set to set an option for one or more specified entities
Usage:
ceph config set <who> <option> <value> {--force}
Subcommand rm to clear an option for one or more entities
Usage:
ceph config rm <who> <option>
Subcommand log to show recent history of config changes. If count option is omitted it defaults to 10.
Usage:
ceph config log {<count>}
Subcommand reset to revert configuration to the specified historical version
Usage:
ceph config reset <version>
Subcommand assimilate-conf to assimilate options from stdin, and return a new, minimal conf file
Usage:
ceph config assimilate-conf -i <input-config-path> > <output-config-path>
ceph config assimilate-conf < <input-config-path>
Subcommand generate-minimal-conf to generate a minimal ceph.conf file, which can be used for
bootstrapping a daemon or a client.
Usage:
ceph config generate-minimal-conf > <minimal-config-path>
config-key
Manage configuration key. Config-key is a general purpose key/value service offered by the monitors. This
service is mainly used by Ceph tools and daemons for persisting various settings. Among which, ceph-mgr
modules uses it for storing their options. It uses some additional subcommands.
Subcommand rm deletes configuration key.
Usage:
ceph config-key rm <key>
Subcommand exists checks for configuration keys existence.
Usage:
ceph config-key exists <key>
Subcommand get gets the configuration key.
Usage:
ceph config-key get <key>
Subcommand ls lists configuration keys.
Usage:
ceph config-key ls
Subcommand dump dumps configuration keys and values.
Usage:
ceph config-key dump
Subcommand set puts configuration key and value.
Usage:
ceph config-key set <key> {<val>}
daemon
Submit admin-socket commands.
Usage:
ceph daemon {daemon_name|socket_path} {command} ...
Example:
ceph daemon osd.0 help
daemonperf
Watch performance counters from a Ceph daemon.
Usage:
ceph daemonperf {daemon_name|socket_path} [{interval} [{count}]]
df
Show cluster's free space status.
Usage:
ceph df {detail}
features
Show the releases and features of all connected daemons and clients connected to the cluster, along with
the numbers of them in each bucket grouped by the corresponding features/releases. Each release of Ceph
supports a different set of features, expressed by the features bitmask. New cluster features require
that clients support the feature, or else they are not allowed to connect to these new features. As new
features or capabilities are enabled after an upgrade, older clients are prevented from connecting.
Usage:
ceph features
fs
Manage cephfs file systems. It uses some additional subcommands.
Subcommand add_data_pool adds an new data pool to the FS. Ths pool can be used for file layouts as an
alternate location to store the file data.
Usage:
ceph fs add_data_pool <fs-name> <pool name/id>
Subcommand authorize creates a new client (if the client doesn't exists on the cluster) that will be
authorized for the given path in <fs_name>. Pass / to authorize for the entire FS. <perms> below can be
r, rw or rwp.
Running it for an existing client can grant the client a new capability (capability for a different
CephFS on the same cluster or for a different path on the same CephFS). Or it can also change read/write
permission in the capability that client already holds.
Usage:
ceph fs authorize <fs_name> client.<client_id> <path> <perms> [<path> <perms>...]
Subcommand dump displays the FSMap at the given epoch (default: current). This includes all file system
settings, MDS daemons and the ranks they hold and list of standby MDS daemons.
Usage:
ceph fs dump [epoch]
Subcommand feature ls lists all CephFS features supported by current version of Ceph.
Usage:
ceph fs feature ls
Subcommand flag set sets a global CephFS flag. Right now the only flag is enable_multiple which allows
multiple CephFSs on a Ceph cluster.
Usage:
ceph fs flag set <flag-name> <flag-val> --yes-i-really-mean-it
Subcommand get displays the information about FS, including settings and ranks. Information printed here
in subset of same information from the fs dump command.
Usage:
ceph fs get <fs-name>
Subcommand ls to list file systems
Usage:
ceph fs ls
Subcommand lsflags displays all the flags set on the given FS.
Usage:
ceph fs lsflags <fs-name>
Subcommand new to make a new file system using named pools <metadata> and <data>
Usage:
ceph fs new <fs_name> <metadata> <data>
Subcommand rename assigns a new name to CephFS and also updates application tags on the pools of this
CephFS.
Usage:
ceph fs rename <fs-name> <new-fs-name> {--yes-i-really-mean-it}
Subcommand required_client_features disables a client that doesn't possess a certain feature from
connecting. This subcommand has two subcommands, one to add a requirement and other to remove the
requirement.
Usage:
ceph fs required_client_features <fs name> add <feature-name>
ceph fs required_client_features <fs name> rm <feature-name>
Subcommand reset is used for disaster recovery only: reset to a single-MDS map
Usage:
ceph fs reset <fs_name> {--yes-i-really-mean-it}
Subcommand rm to disable the named file system
Usage:
ceph fs rm <fs_name> {--yes-i-really-mean-it}
Subcommand rm_data_pool removes the specified pool from FS's list of data pools. File data on this pool
will become unavailable. Default data pool cannot be removed.
Usage:
ceph fs rm_data_pool <fs-name> <pool name/id>
Subcommand set sets or updates a FS setting value for given FS name.
Usage:
ceph fs set <fs-name> <fs-setting> <value>
Subcommand swap swaps the names of two Ceph file system and updates application tags on the pool of the
file systems accordingly. Optionally, FSIDs of the filesystems can also be swapped along with names by
passing --swap-fscids.
Usage:
ceph fs swap <fs1-name> <fs1-id> <fs2-name> <fs2-id> [--swap-fscids] {--yes-i-really-meant-it}
fsid
Show cluster's FSID/UUID.
Usage:
ceph fsid
health
Show cluster's health.
Usage:
ceph health {detail}
heap
Show heap usage info (available only if compiled with tcmalloc)
Usage:
ceph tell <name (type.id)> heap dump|start_profiler|stop_profiler|stats
Subcommand release to make TCMalloc to releases no-longer-used memory back to the kernel at once.
Usage:
ceph tell <name (type.id)> heap release
Subcommand (get|set)_release_rate get or set the TCMalloc memory release rate. TCMalloc releases
no-longer-used memory back to the kernel gradually. the rate controls how quickly this happens. Increase
this setting to make TCMalloc to return unused memory more frequently. 0 means never return memory to
system, 1 means wait for 1000 pages after releasing a page to system. It is 1.0 by default..
Usage:
ceph tell <name (type.id)> heap get_release_rate|set_release_rate {<val>}
injectargs
Inject configuration arguments into monitor.
Usage:
ceph injectargs <injected_args> [<injected_args>...]
log
Log supplied text to the monitor log.
Usage:
ceph log <logtext> [<logtext>...]
mds
Manage metadata server configuration and administration. It uses some additional subcommands.
Subcommand compat manages compatible features. It uses some additional subcommands.
Subcommand rm_compat removes compatible feature.
Usage:
ceph mds compat rm_compat <int[0-]>
Subcommand rm_incompat removes incompatible feature.
Usage:
ceph mds compat rm_incompat <int[0-]>
Subcommand show shows mds compatibility settings.
Usage:
ceph mds compat show
Subcommand fail forces mds to status fail.
Usage:
ceph mds fail <role|gid>
Subcommand rm removes inactive mds.
Usage:
ceph mds rm <int[0-]> <name> (type.id)>
Subcommand rmfailed removes failed mds.
Usage:
ceph mds rmfailed <int[0-]>
Subcommand set_state sets mds state of <gid> to <numeric-state>.
Usage:
ceph mds set_state <int[0-]> <int[0-20]>
Subcommand stat shows MDS status.
Usage:
ceph mds stat
Subcommand repaired mark a damaged MDS rank as no longer damaged.
Usage:
ceph mds repaired <role>
mon
Manage monitor configuration and administration. It uses some additional subcommands.
Subcommand add adds new monitor named <name> at <addr>.
Usage:
ceph mon add <name> <IPaddr[:port]>
Subcommand dump dumps formatted monmap (optionally from epoch)
Usage:
ceph mon dump {<int[0-]>}
Subcommand getmap gets monmap.
Usage:
ceph mon getmap {<int[0-]>}
Subcommand enable_stretch_mode enables stretch mode, changing the peering rules and failure handling on
all pools. For a given PG to successfully peer and be marked active, min_size replicas will now need to
be active under all (currently two) CRUSH buckets of type <dividing_bucket>.
<tiebreaker_mon> is the tiebreaker mon to use if a network split happens.
<dividing_bucket> is the bucket type across which to stretch. This will typically be datacenter or other
CRUSH hierarchy bucket type that denotes physically or logically distant subdivisions.
<new_crush_rule> will be set as CRUSH rule for all pools.
Usage:
ceph mon enable_stretch_mode <tiebreaker_mon> <new_crush_rule> <dividing_bucket>
Subcommand remove removes monitor named <name>.
Usage:
ceph mon remove <name>
Subcommand stat summarizes monitor status.
Usage:
ceph mon stat
mgr
Ceph manager daemon configuration and management.
Subcommand dump dumps the latest MgrMap, which describes the active and standby manager daemons.
Usage:
ceph mgr dump
Subcommand fail will mark a manager daemon as failed, removing it from the manager map. If it is the
active manager daemon a standby will take its place.
Usage:
ceph mgr fail <name>
Subcommand module ls will list currently enabled manager modules (plugins).
Usage:
ceph mgr module ls
Subcommand module enable will enable a manager module. Available modules are included in MgrMap and
visible via mgr dump.
Usage:
ceph mgr module enable <module>
Subcommand module disable will disable an active manager module.
Usage:
ceph mgr module disable <module>
Subcommand metadata will report metadata about all manager daemons or, if the name is specified, a single
manager daemon.
Usage:
ceph mgr metadata [name]
Subcommand versions will report a count of running daemon versions.
Usage:
ceph mgr versions
Subcommand count-metadata will report a count of any daemon metadata field.
Usage:
ceph mgr count-metadata <field>
osd
Manage OSD configuration and administration. It uses some additional subcommands.
Subcommand blocklist manage blocklisted clients. It uses some additional subcommands.
Subcommand add add <addr> to blocklist (optionally until <expire> seconds from now)
Usage:
ceph osd blocklist add <EntityAddr> {<float[0.0-]>}
Subcommand ls show blocklisted clients
Usage:
ceph osd blocklist ls
Subcommand rm remove <addr> from blocklist
Usage:
ceph osd blocklist rm <EntityAddr>
Subcommand blocked-by prints a histogram of which OSDs are blocking their peers
Usage:
ceph osd blocked-by
Subcommand create creates new osd (with optional UUID and ID).
This command is DEPRECATED as of the Luminous release, and will be removed in a future release.
Subcommand new should instead be used.
Usage:
ceph osd create {<uuid>} {<id>}
Subcommand new can be used to create a new OSD or to recreate a previously destroyed OSD with a specific
id. The new OSD will have the specified uuid, and the command expects a JSON file containing the base64
cephx key for auth entity client.osd.<id>, as well as optional base64 cepx key for dm-crypt lockbox
access and a dm-crypt key. Specifying a dm-crypt requires specifying the accompanying lockbox cephx key.
Usage:
ceph osd new {<uuid>} {<id>} -i {<params.json>}
The parameters JSON file is optional but if provided, is expected to maintain a form of the following
format:
{
"cephx_secret": "AQBWtwhZdBO5ExAAIDyjK2Bh16ZXylmzgYYEjg==",
"crush_device_class": "myclass"
}
Or:
{
"cephx_secret": "AQBWtwhZdBO5ExAAIDyjK2Bh16ZXylmzgYYEjg==",
"cephx_lockbox_secret": "AQDNCglZuaeVCRAAYr76PzR1Anh7A0jswkODIQ==",
"dmcrypt_key": "<dm-crypt key>",
"crush_device_class": "myclass"
}
Or:
{
"crush_device_class": "myclass"
}
The "crush_device_class" property is optional. If specified, it will set the initial CRUSH device class
for the new OSD.
Subcommand crush is used for CRUSH management. It uses some additional subcommands.
Subcommand add adds or updates crushmap position and weight for <name> with <weight> and location <args>.
Usage:
ceph osd crush add <osdname (id|osd.id)> <float[0.0-]> <args> [<args>...]
Subcommand add-bucket adds no-parent (probably root) crush bucket <name> of type <type>.
Usage:
ceph osd crush add-bucket <name> <type>
Subcommand create-or-move creates entry or moves existing entry for <name> <weight> at/to location
<args>.
Usage:
ceph osd crush create-or-move <osdname (id|osd.id)> <float[0.0-]> <args>
[<args>...]
Subcommand dump dumps crush map.
Usage:
ceph osd crush dump
Subcommand get-tunable get crush tunable straw_calc_version
Usage:
ceph osd crush get-tunable straw_calc_version
Subcommand link links existing entry for <name> under location <args>.
Usage:
ceph osd crush link <name> <args> [<args>...]
Subcommand move moves existing entry for <name> to location <args>.
Usage:
ceph osd crush move <name> <args> [<args>...]
Subcommand remove removes <name> from crush map (everywhere, or just at <ancestor>).
Usage:
ceph osd crush remove <name> {<ancestor>}
Subcommand rename-bucket renames bucket <srcname> to <dstname>
Usage:
ceph osd crush rename-bucket <srcname> <dstname>
Subcommand reweight change <name>'s weight to <weight> in crush map.
Usage:
ceph osd crush reweight <name> <float[0.0-]>
Subcommand reweight-all recalculate the weights for the tree to ensure they sum correctly
Usage:
ceph osd crush reweight-all
Subcommand reweight-subtree changes all leaf items beneath <name> to <weight> in crush map
Usage:
ceph osd crush reweight-subtree <name> <weight>
Subcommand rm removes <name> from crush map (everywhere, or just at <ancestor>).
Usage:
ceph osd crush rm <name> {<ancestor>}
Subcommand rule is used for creating crush rules. It uses some additional subcommands.
Subcommand create-erasure creates crush rule <name> for erasure coded pool created with <profile>
(default default).
Usage:
ceph osd crush rule create-erasure <name> {<profile>}
Subcommand create-simple creates crush rule <name> to start from <root>, replicate across buckets of type
<type>, using a choose mode of <firstn|indep> (default firstn; indep best for erasure pools).
Usage:
ceph osd crush rule create-simple <name> <root> <type> {firstn|indep}
Subcommand dump dumps crush rule <name> (default all).
Usage:
ceph osd crush rule dump {<name>}
Subcommand ls lists crush rules.
Usage:
ceph osd crush rule ls
Subcommand rm removes crush rule <name>.
Usage:
ceph osd crush rule rm <name>
Subcommand set used alone, sets crush map from input file.
Usage:
ceph osd crush set
Subcommand set with osdname/osd.id update crushmap position and weight for <name> to <weight> with
location <args>.
Usage:
ceph osd crush set <osdname (id|osd.id)> <float[0.0-]> <args> [<args>...]
Subcommand set-tunable set crush tunable <tunable> to <value>. The only tunable that can be set is
straw_calc_version.
Usage:
ceph osd crush set-tunable straw_calc_version <value>
Subcommand show-tunables shows current crush tunables.
Usage:
ceph osd crush show-tunables
Subcommand tree shows the crush buckets and items in a tree view.
Usage:
ceph osd crush tree
Subcommand tunables sets crush tunables values to <profile>.
Usage:
ceph osd crush tunables legacy|argonaut|bobtail|firefly|hammer|optimal|default
Subcommand unlink unlinks <name> from crush map (everywhere, or just at <ancestor>).
Usage:
ceph osd crush unlink <name> {<ancestor>}
Subcommand df shows OSD utilization
Usage:
ceph osd df {plain|tree}
Subcommand deep-scrub initiates deep scrub on specified osd.
Usage:
ceph osd deep-scrub <who>
Subcommand down sets osd(s) <id> [<id>...] down.
Usage:
ceph osd down <ids> [<ids>...]
Subcommand dump prints summary of OSD map.
Usage:
ceph osd dump {<int[0-]>}
Subcommand erasure-code-profile is used for managing the erasure code profiles. It uses some additional
subcommands.
Subcommand get gets erasure code profile <name>.
Usage:
ceph osd erasure-code-profile get <name>
Subcommand ls lists all erasure code profiles.
Usage:
ceph osd erasure-code-profile ls
Subcommand rm removes erasure code profile <name>.
Usage:
ceph osd erasure-code-profile rm <name>
Subcommand set creates erasure code profile <name> with [<key[=value]> ...] pairs. Add a --force at the
end to override an existing profile (IT IS RISKY).
Usage:
ceph osd erasure-code-profile set <name> {<profile> [<profile>...]}
Subcommand find find osd <id> in the CRUSH map and shows its location.
Usage:
ceph osd find <int[0-]>
Subcommand getcrushmap gets CRUSH map.
Usage:
ceph osd getcrushmap {<int[0-]>}
Subcommand getmap gets OSD map.
Usage:
ceph osd getmap {<int[0-]>}
Subcommand getmaxosd shows largest OSD id.
Usage:
ceph osd getmaxosd
Subcommand in sets osd(s) <id> [<id>...] in.
Usage:
ceph osd in <ids> [<ids>...]
Subcommand lost marks osd as permanently lost. THIS DESTROYS DATA IF NO MORE REPLICAS EXIST, BE CAREFUL.
Usage:
ceph osd lost <int[0-]> {--yes-i-really-mean-it}
Subcommand ls shows all OSD ids.
Usage:
ceph osd ls {<int[0-]>}
Subcommand lspools lists pools.
Usage:
ceph osd lspools {<int>}
Subcommand map finds pg for <object> in <pool>.
Usage:
ceph osd map <poolname> <objectname>
Subcommand metadata fetches metadata for osd <id>.
Usage:
ceph osd metadata {int[0-]} (default all)
Subcommand out sets osd(s) <id> [<id>...] out.
Usage:
ceph osd out <ids> [<ids>...]
Subcommand ok-to-stop checks whether the list of OSD(s) can be stopped without immediately making data
unavailable. That is, all data should remain readable and writeable, although data redundancy may be
reduced as some PGs may end up in a degraded (but active) state. It will return a success code if it is
okay to stop the OSD(s), or an error code and informative message if it is not or if no conclusion can be
drawn at the current time. When --max <num> is provided, up to <num> OSDs IDs will return (including the
provided OSDs) that can all be stopped simultaneously. This allows larger sets of stoppable OSDs to be
generated easily by providing a single starting OSD and a max. Additional OSDs are drawn from adjacent
locations in the CRUSH hierarchy.
Usage:
ceph osd ok-to-stop <id> [<ids>...] [--max <num>]
Subcommand pause pauses osd.
Usage:
ceph osd pause
Subcommand perf prints dump of OSD perf summary stats.
Usage:
ceph osd perf
Subcommand pg-temp set pg_temp mapping pgid:[<id> [<id>...]] (developers only).
Usage:
ceph osd pg-temp <pgid> {<id> [<id>...]}
Subcommand force-create-pg forces creation of pg <pgid>.
Usage:
ceph osd force-create-pg <pgid>
Subcommand pool is used for managing data pools. It uses some additional subcommands.
Subcommand create creates pool.
Usage:
ceph osd pool create <poolname> {<int[0-]>} {<int[0-]>} {replicated|erasure}
{<erasure_code_profile>} {<rule>} {<int>} {--autoscale-mode=<on,off,warn>}
Subcommand delete deletes pool.
Usage:
ceph osd pool delete <poolname> {<poolname>} {--yes-i-really-really-mean-it}
Subcommand get gets pool parameter <var>.
Usage:
ceph osd pool get <poolname> size|min_size|pg_num|pgp_num|crush_rule|write_fadvise_dontneed
Only for tiered pools:
ceph osd pool get <poolname> hit_set_type|hit_set_period|hit_set_count|hit_set_fpp|
target_max_objects|target_max_bytes|cache_target_dirty_ratio|cache_target_dirty_high_ratio|
cache_target_full_ratio|cache_min_flush_age|cache_min_evict_age|
min_read_recency_for_promote|hit_set_grade_decay_rate|hit_set_search_last_n
Only for erasure coded pools:
ceph osd pool get <poolname> erasure_code_profile
Use all to get all pool parameters that apply to the pool's type:
ceph osd pool get <poolname> all
Subcommand get-quota obtains object or byte limits for pool.
Usage:
ceph osd pool get-quota <poolname>
Subcommand ls list pools
Usage:
ceph osd pool ls {detail}
Subcommand mksnap makes snapshot <snap> in <pool>.
Usage:
ceph osd pool mksnap <poolname> <snap>
Subcommand rename renames <srcpool> to <destpool>.
Usage:
ceph osd pool rename <poolname> <poolname>
Subcommand rmsnap removes snapshot <snap> from <pool>.
Usage:
ceph osd pool rmsnap <poolname> <snap>
Subcommand set sets pool parameter <var> to <val>.
Usage:
ceph osd pool set <poolname> size|min_size|pg_num|
pgp_num|crush_rule|hashpspool|nodelete|nopgchange|nosizechange|
hit_set_type|hit_set_period|hit_set_count|hit_set_fpp|debug_fake_ec_pool|
target_max_bytes|target_max_objects|cache_target_dirty_ratio|
cache_target_dirty_high_ratio|
cache_target_full_ratio|cache_min_flush_age|cache_min_evict_age|
min_read_recency_for_promote|write_fadvise_dontneed|hit_set_grade_decay_rate|
hit_set_search_last_n
<val> {--yes-i-really-mean-it}
Subcommand set-quota sets object or byte limit on pool.
Usage:
ceph osd pool set-quota <poolname> max_objects|max_bytes <val>
Subcommand stats obtain stats from all pools, or from specified pool.
Usage:
ceph osd pool stats {<name>}
Subcommand application is used for adding an annotation to the given pool. By default, the possible
applications are object, block, and file storage (corresponding app-names are "rgw", "rbd", and
"cephfs"). However, there might be other applications as well. Based on the application, there may or may
not be some processing conducted.
Subcommand disable disables the given application on the given pool.
Usage:
ceph osd pool application disable <pool-name> <app> {--yes-i-really-mean-it}
Subcommand enable adds an annotation to the given pool for the mentioned application.
Usage:
ceph osd pool application enable <pool-name> <app> {--yes-i-really-mean-it}
Subcommand get displays the value for the given key that is associated with the given application of the
given pool. Not passing the optional arguments would display all key-value pairs for all applications for
all pools.
Usage:
ceph osd pool application get {<pool-name>} {<app>} {<key>}
Subcommand rm removes the key-value pair for the given key in the given application of the given pool.
Usage:
ceph osd pool application rm <pool-name> <app> <key>
Subcommand set associates or updates, if it already exists, a key-value pair with the given application
for the given pool.
Usage:
ceph osd pool application set <pool-name> <app> <key> <value>
Subcommand primary-affinity adjust osd primary-affinity from 0.0 <=<weight> <= 1.0
Usage:
ceph osd primary-affinity <osdname (id|osd.id)> <float[0.0-1.0]>
Subcommand primary-temp sets primary_temp mapping pgid:<id>|-1 (developers only).
Usage:
ceph osd primary-temp <pgid> <id>
Subcommand repair initiates repair on a specified osd.
Usage:
ceph osd repair <who>
Subcommand reweight reweights osd to 0.0 < <weight> < 1.0.
Usage:
osd reweight <int[0-]> <float[0.0-1.0]>
Subcommand reweight-by-pg reweight OSDs by PG distribution [overload-percentage-for-consideration,
default 120].
Usage:
ceph osd reweight-by-pg {<int[100-]>} {<poolname> [<poolname...]}
{--no-increasing}
Subcommand reweight-by-utilization reweights OSDs by utilization. It only reweights outlier OSDs whose
utilization exceeds the average, eg. the default 120% limits reweight to those OSDs that are more than
20% over the average. [overload-threshold, default 120 [max_weight_change, default 0.05
[max_osds_to_adjust, default 4]]]
Usage:
ceph osd reweight-by-utilization {<int[100-]> {<float[0.0-]> {<int[0-]>}}}
{--no-increasing}
Subcommand rm removes osd(s) <id> [<id>...] from the OSD map.
Usage:
ceph osd rm <ids> [<ids>...]
Subcommand destroy marks OSD id as destroyed, removing its cephx entity's keys and all of its dm-crypt
and daemon-private config key entries.
This command will not remove the OSD from crush, nor will it remove the OSD from the OSD map. Instead,
once the command successfully completes, the OSD will show marked as destroyed.
In order to mark an OSD as destroyed, the OSD must first be marked as lost.
Usage:
ceph osd destroy <id> {--yes-i-really-mean-it}
Subcommand purge performs a combination of osd destroy, osd rm and osd crush remove.
Usage:
ceph osd purge <id> {--yes-i-really-mean-it}
Subcommand safe-to-destroy checks whether it is safe to remove or destroy an OSD without reducing overall
data redundancy or durability. It will return a success code if it is definitely safe, or an error code
and informative message if it is not or if no conclusion can be drawn at the current time.
Usage:
ceph osd safe-to-destroy <id> [<ids>...]
Subcommand scrub initiates scrub on specified osd.
Usage:
ceph osd scrub <who>
Subcommand set sets cluster-wide <flag> by updating OSD map. The full flag is not honored anymore since
the Mimic release, and ceph osd set full is not supported in the Octopus release.
Usage:
ceph osd set pause|noup|nodown|noout|noin|nobackfill|
norebalance|norecover|noscrub|nodeep-scrub|notieragent
Subcommand setcrushmap sets crush map from input file.
Usage:
ceph osd setcrushmap
Subcommand setmaxosd sets new maximum osd value.
Usage:
ceph osd setmaxosd <int[0-]>
Subcommand set-require-min-compat-client enforces the cluster to be backward compatible with the
specified client version. This subcommand prevents you from making any changes (e.g., crush tunables, or
using new features) that would violate the current setting. Please note, This subcommand will fail if any
connected daemon or client is not compatible with the features offered by the given <version>. To see the
features and releases of all clients connected to cluster, please see ceph features.
Usage:
ceph osd set-require-min-compat-client <version>
Subcommand stat prints summary of OSD map.
Usage:
ceph osd stat
Subcommand tier is used for managing tiers. It uses some additional subcommands.
Subcommand add adds the tier <tierpool> (the second one) to base pool <pool> (the first one).
Usage:
ceph osd tier add <poolname> <poolname> {--force-nonempty}
Subcommand add-cache adds a cache <tierpool> (the second one) of size <size> to existing pool <pool> (the
first one).
Usage:
ceph osd tier add-cache <poolname> <poolname> <int[0-]>
Subcommand cache-mode specifies the caching mode for cache tier <pool>.
Usage:
ceph osd tier cache-mode <poolname> writeback|proxy|readproxy|readonly|none
Subcommand remove removes the tier <tierpool> (the second one) from base pool <pool> (the first one).
Usage:
ceph osd tier remove <poolname> <poolname>
Subcommand remove-overlay removes the overlay pool for base pool <pool>.
Usage:
ceph osd tier remove-overlay <poolname>
Subcommand set-overlay set the overlay pool for base pool <pool> to be <overlaypool>.
Usage:
ceph osd tier set-overlay <poolname> <poolname>
Subcommand tree prints OSD tree.
Usage:
ceph osd tree {<int[0-]>}
Subcommand unpause unpauses osd.
Usage:
ceph osd unpause
Subcommand unset unsets cluster-wide <flag> by updating OSD map.
Usage:
ceph osd unset pause|noup|nodown|noout|noin|nobackfill|
norebalance|norecover|noscrub|nodeep-scrub|notieragent
pg
It is used for managing the placement groups in OSDs. It uses some additional subcommands.
Subcommand debug shows debug info about pgs.
Usage:
ceph pg debug unfound_objects_exist|degraded_pgs_exist
Subcommand deep-scrub starts deep-scrub on <pgid>.
Usage:
ceph pg deep-scrub <pgid>
Subcommand dump shows human-readable versions of pg map (only 'all' valid with plain).
Usage:
ceph pg dump {all|summary|sum|delta|pools|osds|pgs|pgs_brief} [{all|summary|sum|delta|pools|osds|pgs|pgs_brief...]}
Subcommand dump_json shows human-readable version of pg map in json only.
Usage:
ceph pg dump_json {all|summary|sum|delta|pools|osds|pgs|pgs_brief} [{all|summary|sum|delta|pools|osds|pgs|pgs_brief...]}
Subcommand dump_pools_json shows pg pools info in json only.
Usage:
ceph pg dump_pools_json
Subcommand dump_stuck shows information about stuck pgs.
Usage:
ceph pg dump_stuck {inactive|unclean|stale|undersized|degraded [inactive|unclean|stale|undersized|degraded...]}
{<int>}
Subcommand getmap gets binary pg map to -o/stdout.
Usage:
ceph pg getmap
Subcommand ls lists pg with specific pool, osd, state
Usage:
ceph pg ls {<int>} {<pg-state> [<pg-state>...]}
Subcommand ls-by-osd lists pg on osd [osd]
Usage:
ceph pg ls-by-osd <osdname (id|osd.id)> {<int>}
{<pg-state> [<pg-state>...]}
Subcommand ls-by-pool lists pg with pool = [poolname]
Usage:
ceph pg ls-by-pool <poolstr> {<int>} {<pg-state> [<pg-state>...]}
Subcommand ls-by-primary lists pg with primary = [osd]
Usage:
ceph pg ls-by-primary <osdname (id|osd.id)> {<int>}
{<pg-state> [<pg-state>...]}
Subcommand map shows mapping of pg to osds.
Usage:
ceph pg map <pgid>
Subcommand repair starts repair on <pgid>.
Usage:
ceph pg repair <pgid>
Subcommand scrub starts scrub on <pgid>.
Usage:
ceph pg scrub <pgid>
Subcommand stat shows placement group status.
Usage:
ceph pg stat
quorum
Cause a specific MON to enter or exit quorum.
Usage:
ceph tell mon.<id> quorum enter|exit
quorum_status
Reports status of monitor quorum.
Usage:
ceph quorum_status
report
Reports full status of cluster, optional title tag strings.
Usage:
ceph report {<tags> [<tags>...]}
status
Shows cluster status.
Usage:
ceph status
tell
Sends a command to a specific daemon.
Usage:
ceph tell <name (type.id)> <command> [options...]
List all available commands.
Usage:
ceph tell <name (type.id)> help
version
Show mon daemon version
Usage:
ceph version
OPTIONS
-i infile, --in-file=infile
will specify an input file to be passed along as a payload with the command to the monitor
cluster. This is only used for specific monitor commands.
-o outfile, --out-file=outfile
will write any payload returned by the monitor cluster with its reply to outfile. Only specific
monitor commands (e.g. osd getmap) return a payload.
--setuser user
will apply the appropriate user ownership to the file specified by the option '-o'.
--setgroup group
will apply the appropriate group ownership to the file specified by the option '-o'.
-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.
--id CLIENT_ID, --user CLIENT_ID
Client id for authentication.
--name CLIENT_NAME, -n CLIENT_NAME
Client name for authentication.
--cluster CLUSTER
Name of the Ceph cluster.
--admin-daemon ADMIN_SOCKET, daemon DAEMON_NAME
Submit admin-socket commands via admin sockets in /var/run/ceph.
--admin-socket ADMIN_SOCKET_NOPE
You probably mean --admin-daemon
-s, --status
Show cluster status.
-w, --watch
Watch live cluster changes on the default 'cluster' channel
-W, --watch-channel
Watch live cluster changes on any channel (cluster, audit, cephadm, or * for all)
--watch-debug
Watch debug events.
--watch-info
Watch info events.
--watch-sec
Watch security events.
--watch-warn
Watch warning events.
--watch-error
Watch error events.
--version, -v
Display version.
--verbose
Make verbose.
--concise
Make less verbose.
-f {json,json-pretty,xml,xml-pretty,plain,yaml}, --format
Format of output. Note: yaml is only valid for orch commands.
--connect-timeout CLUSTER_TIMEOUT
Set a timeout for connecting to the cluster.
--no-increasing
--no-increasing is off by default. So increasing the osd weight is allowed using the
reweight-by-utilization or test-reweight-by-utilization commands. If this option is used with
these commands, it will help not to increase osd weight even the osd is under utilized.
--block
block until completion (scrub and deep-scrub only)
AVAILABILITY
ceph is part of Ceph, a massively scalable, open-source, distributed storage system. Please refer to the
Ceph documentation at https://docs.ceph.com for more information.
SEE ALSO
ceph-mon(8), ceph-osd(8), ceph-mds(8)
COPYRIGHT
2010-2025, Inktank Storage, Inc. and contributors. Licensed under Creative Commons Attribution Share
Alike 3.0 (CC-BY-SA-3.0)
dev Jun 24, 2025 CEPH(8)