cephadm - Man Page

manage the local cephadm host


cephadm** [-h] [--image IMAGE] [--docker] [--data-dir DATA_DIR]
[--log-dir LOG_DIR] [--logrotate-dir LOGROTATE_DIR]
[--unit-dir UNIT_DIR] [--verbose] [--timeout TIMEOUT]
[--retry RETRY] [--no-container-init]
cephadm pull
cephadm --image IMAGE_NAME inspect-image
cephadm ls [-h] [--no-detail] [--legacy-dir LEGACY_DIR]
cephadm list-networks
cephadm adopt [-h] --name NAME --style STYLE [--cluster CLUSTER]
[--legacy-dir LEGACY_DIR] [--config-json CONFIG_JSON]
[--skip-firewalld] [--skip-pull]
cephadm rm-daemon [-h] --name NAME --fsid FSID [--force]
cephadm rm-cluster [-h] --fsid FSID [--force]
cephadm run [-h] --name NAME --fsid FSID
cephadm shell [-h] [--fsid FSID] [--name NAME] [--config CONFIG]
[--keyring KEYRING] --mount [MOUNT [MOUNT ...]] [--env ENV]
[--] [command [command ...]]
cephadm enter [-h] [--fsid FSID] --name NAME [command [command ...]]
cephadm ceph-volume [-h] [--fsid FSID] [--config-json CONFIG_JSON]
[--config CONFIG] [--keyring KEYRING]
command [command ...]
cephadm unit  [-h] [--fsid FSID] --name NAME command
cephadm logs [-h] [--fsid FSID] --name NAME [command [command ...]]
cephadm bootstrap [-h] [--config CONFIG] [--mon-id MON_ID]
[--mon-addrv MON_ADDRV] [--mon-ip MON_IP]
[--mgr-id MGR_ID] [--fsid FSID]
[--log-to-file] [--single-host-defaults]
[--output-dir OUTPUT_DIR]
[--output-keyring OUTPUT_KEYRING]
[--output-config OUTPUT_CONFIG]
[--output-pub-ssh-key OUTPUT_PUB_SSH_KEY]
[--initial-dashboard-user INITIAL_DASHBOARD_USER]
[--initial-dashboard-password INITIAL_DASHBOARD_PASSWORD]
[--ssl-dashboard-port SSL_DASHBOARD_PORT]
[--dashboard-key DASHBOARD_KEY]
[--dashboard-crt DASHBOARD_CRT]
[--ssh-config SSH_CONFIG]
[--ssh-private-key SSH_PRIVATE_KEY]
[--ssh-public-key SSH_PUBLIC_KEY]
[--ssh-user SSH_USER] [--skip-mon-network]
[--skip-dashboard] [--dashboard-password-noupdate]
[--no-minimize-config] [--skip-ping-check]
[--skip-pull] [--skip-firewalld] [--allow-overwrite]
[--allow-fqdn-hostname] [--skip-prepare-host]
[--orphan-initial-daemons] [--skip-monitoring-stack]
[--apply-spec APPLY_SPEC]
[--registry-url REGISTRY_URL]
[--registry-username REGISTRY_USERNAME]
[--registry-password REGISTRY_PASSWORD]
[--registry-json REGISTRY_JSON]
cephadm deploy [-h] --name NAME --fsid FSID [--config CONFIG]
[--config-json CONFIG_JSON] [--keyring KEYRING]
[--key KEY] [--osd-fsid OSD_FSID] [--skip-firewalld]
[--tcp-ports TCP_PORTS] [--reconfig] [--allow-ptrace]
cephadm check-host [-h] [--expect-hostname EXPECT_HOSTNAME]
cephadm prepare-host
cephadm add-repo [-h] [--release RELEASE] [--version VERSION]
[--dev DEV] [--dev-commit DEV_COMMIT]
[--gpg-url GPG_URL] [--repo-url REPO_URL]
cephadm rm-repo
cephadm install [-h] [packages [packages ...]]
cephadm registry-login [-h] [--registry-url REGISTRY_URL]
[--registry-username REGISTRY_USERNAME]
[--registry-password REGISTRY_PASSWORD]
[--registry-json REGISTRY_JSON] [--fsid FSID]


cephadm is a command line tool to manage the local host for the cephadm orchestrator.

It provides commands to investigate and modify the state of the current host.

cephadm is not required on all hosts, but useful when investigating a particular daemon.


--image IMAGE

container image. Can also be set via the "CEPHADM_IMAGE" env var (default: None)


use docker instead of podman (default: False)

--data-dir DATA_DIR

base directory for daemon data (default: /var/lib/ceph)

--log-dir LOG_DIR

base directory for daemon logs (default: /var/log/ceph)

--logrotate-dir LOGROTATE_DIR

location of logrotate configuration files (default: /etc/logrotate.d)

--unit-dir UNIT_DIR

base directory for systemd units (default: /etc/systemd/system)

--verbose,  -v

Show debug-level log messages (default: False)

--timeout TIMEOUT

timeout in seconds (default: None)

--retry RETRY

max number of retries (default: 10)


do not run podman/docker with --init (default: False)



configure local package repository to also include the ceph repository.


  • [--release RELEASE]       use latest version of a named release (e.g., octopus)
  • [--version VERSION]       use specific upstream version (x.y.z)
  • [--dev DEV]               use specified bleeding edge build from git branch or tag
  • [--dev-commit DEV_COMMIT] use specified bleeding edge build from git commit
  • [--gpg-url GPG_URL]       specify alternative GPG key location
  • [--repo-url REPO_URL]     specify alternative repo location


Adopt a daemon deployed with a different deployment tool.


  • [--name NAME, -n NAME]       daemon name (type.id)
  • [--style STYLE]              deployment style (legacy, ...)
  • [--cluster CLUSTER]          cluster name
  • [--legacy-dir LEGACY_DIR]    base directory for legacy daemon data
  • [--config-json CONFIG_JSON]  Additional configuration information in JSON format
  • [--skip-firewalld]           Do not configure firewalld
  • [--skip-pull]                do not pull the latest image before adopting


When starting the shell, cephadm looks for configuration in the following order. Only the first values found are used:

  1. An explicit, user provided path to a config file (-c/--config option)
  2. Config file for daemon specified with --name parameter (/var/lib/ceph/<fsid>/<daemon-name>/config)
  3. /var/lib/ceph/<fsid>/config/ceph.conf if it exists
  4. The config file for a mon daemon (/var/lib/ceph/<fsid>/mon.<mon-id>/config) if it exists
  5. Finally: fallback to the default file /etc/ceph/ceph.conf


Bootstrap a cluster on the local host. It deploys a MON and a MGR and then also automatically deploys the monitoring stack on this host (see --skip-monitoring-stack) and calls ceph orch host add $(hostname) (see --skip-ssh).


  • [--config CONFIG, -c CONFIG]    ceph conf file to incorporate
  • [--mon-id MON_ID]               mon id (default: local hostname)
  • [--mon-addrv MON_ADDRV]         mon IPs (e.g., [v2:localipaddr:3300,v1:localipaddr:6789])
  • [--mon-ip MON_IP]               mon IP
  • [--mgr-id MGR_ID]               mgr id (default: randomly generated)
  • [--fsid FSID]                   cluster FSID
  • [--log-to-file]                 configure cluster to log to traditional log files
  • [--single-host-defaults]        configure cluster to run on a single host
  • [--output-dir OUTPUT_DIR]       directory to write config, keyring, and pub key files
  • [--output-keyring OUTPUT_KEYRING] location to write keyring file with new cluster admin and mon keys
  • [--output-config OUTPUT_CONFIG] location to write conf file to connect to new cluster
  • [--output-pub-ssh-key OUTPUT_PUB_SSH_KEY] location to write the cluster's public SSH key
  • [--skip-ssh                     skip setup of ssh key on local host
  • [--initial-dashboard-user INITIAL_DASHBOARD_USER] Initial user for the dashboard
  • [--initial-dashboard-password INITIAL_DASHBOARD_PASSWORD] Initial password for the initial dashboard user
  • [--ssl-dashboard-port SSL_DASHBOARD_PORT] Port number used to connect with dashboard using SSL
  • [--dashboard-key DASHBOARD_KEY] Dashboard key
  • [--dashboard-crt DASHBOARD_CRT] Dashboard certificate
  • [--ssh-config SSH_CONFIG] SSH config
  • [--ssh-private-key SSH_PRIVATE_KEY] SSH private key
  • [--ssh-public-key SSH_PUBLIC_KEY] SSH public key
  • [--ssh-user SSH_USER]           set user for SSHing to cluster hosts, passwordless sudo will be needed for non-root users'
  • [--skip-mon-network]            set mon public_network based on bootstrap mon ip
  • [--skip-dashboard]              do not enable the Ceph Dashboard
  • [--dashboard-password-noupdate] stop forced dashboard password change
  • [--no-minimize-config]          do not assimilate and minimize the config file
  • [--skip-ping-check]             do not verify that mon IP is pingable
  • [--skip-pull]                   do not pull the latest image before bootstrapping
  • [--skip-firewalld]              Do not configure firewalld
  • [--allow-overwrite]             allow overwrite of existing --output-* config/keyring/ssh files
  • [--allow-fqdn-hostname]         allow hostname that is fully-qualified (contains ".")
  • [--skip-prepare-host]           Do not prepare host
  • [--orphan-initial-daemons]      Do not create initial mon, mgr, and crash service specs
  • [--skip-monitoring-stack]       Do not automatically provision monitoring stack] (prometheus, grafana, alertmanager, node-exporter)
  • [--apply-spec APPLY_SPEC]       Apply cluster spec after bootstrap (copy ssh key, add hosts and apply services)
  • [--registry-url REGISTRY_URL]   url of custom registry to login to. e.g. docker.io, quay.io
  • [--registry-username REGISTRY_USERNAME] username of account to login to on custom registry
  • [--registry-password REGISTRY_PASSWORD] password of account to login to on custom registry
  • [--registry-json REGISTRY_JSON] JSON file containing registry login info (see registry-login command documentation)


Run ceph-volume inside a container:

cephadm ceph-volume inventory

Positional arguments: * [command]               command


  • [--fsid FSID]                    cluster FSID
  • [--config-json CONFIG_JSON]      JSON file with config and (client.bootstrap-osd) key
  • [--config CONFIG, -c CONFIG]     ceph conf file
  • [--keyring KEYRING, -k KEYRING]  ceph.keyring to pass through to the container


check host configuration to be suitable for a Ceph cluster.


  • [--expect-hostname EXPECT_HOSTNAME] Check that hostname matches an expected value


deploy a daemon on the local host. Used by the orchestrator CLI:

cephadm shell -- ceph orch apply <type> ...


  • [--name NAME]               daemon name (type.id)
  • [--fsid FSID]               cluster FSID
  • [--config CONFIG, -c CONFIG] config file for new daemon
  • [--config-json CONFIG_JSON] Additional configuration information in JSON format
  • [--keyring KEYRING]         keyring for new daemon
  • [--key KEY]                 key for new daemon
  • [--osd-fsid OSD_FSID]       OSD uuid, if creating an OSD container
  • [--skip-firewalld]          Do not configure firewalld
  • [--tcp-ports                List of tcp ports to open in the host firewall
  • [--reconfig]                Reconfigure a previously deployed daemon
  • [--allow-ptrace]            Allow SYS_PTRACE on daemon container


Run an interactive shell inside a running daemon container:

cephadm enter --name mgr.myhost.ysubfo

Positional arguments: * [command]               command


  • [--fsid FSID]           cluster FSID
  • [--name NAME, -n NAME]  daemon name (type.id)


install ceph package(s)

Positional arguments:

  • [packages]    packages


Inspect local Ceph container image. From Reef onward, requires specifying the image to inspect with --image:

cephadm --image IMAGE_NAME inspect-image


list IP networks


list daemon instances known to cephadm on this host:

$ cephadm ls
        "style": "cephadm:v1",
        "name": "mgr.storage-14b-1.ysubfo",
        "fsid": "5110cb22-8332-11ea-9148-0894ef7e8bdc",
        "enabled": true,
        "state": "running",
        "container_id": "8562de72370a3836473ecfff8a22c9ccdd99815386b4692a2b30924fb5493c44",
        "container_image_name": "docker.io/ceph/ceph:v15",
        "container_image_id": "bc83a388465f0568dab4501fb7684398dca8b50ca12a342a57f21815721723c2",
        "version": "15.2.1",
        "started": "2020-04-21T01:16:41.831456",
        "created": "2020-04-21T01:16:41.775024",
        "deployed": "2020-04-21T01:16:41.415021",
        "configured": "2020-04-21T01:16:41.775024"


  • [--no-detail]             Do not include daemon status
  • [--legacy-dir LEGACY_DIR] Base directory for legacy daemon data


print journald logs for a daemon container:

cephadm logs --name mgr.myhost.ysubfo

This is similar to:

journalctl -u mgr.myhost.ysubfo

Can also specify additional journal arguments:

cephadm logs --name mgr.myhost.ysubfo -- -n 20 # last 20 lines
cephadm logs --name mgr.myhost.ysubfo -- -f # follow the log

Positional arguments:

  • [command]               command (optional)


  • [--fsid FSID]           cluster FSID
  • [--name NAME, -n NAME]  daemon name (type.id)


prepare a host for cephadm use


  • [--expect-hostname EXPECT_HOSTNAME] Set hostname


Pull the ceph image:

cephadm pull


Give cephadm login information for an authenticated registry (url, username and password). Cephadm will attempt to log the calling host into that registry:

cephadm registry-login --registry-url [REGISTRY_URL] --registry-username [USERNAME]
                       --registry-password [PASSWORD]

Can also use a JSON file containing the login info formatted as:


and turn it in with command:

cephadm registry-login --registry-json [JSON FILE]


  • [--registry-url REGISTRY_URL]   url of registry to login to. e.g. docker.io, quay.io
  • [--registry-username REGISTRY_USERNAME] username of account to login to on registry
  • [--registry-password REGISTRY_PASSWORD] password of account to login to on registry
  • [--registry-json REGISTRY_JSON] JSON file containing login info for custom registry
  • [--fsid FSID]                   cluster FSID


Remove a specific daemon instance


  • [--name NAME, -n NAME]  daemon name (type.id)
  • [--fsid FSID]           cluster FSID
  • [--force]               proceed, even though this may destroy valuable data
  • [--force-delete-data]   delete valuable daemon data instead of making a backup


remove all daemons for a cluster


  • [--fsid FSID]  cluster FSID
  • [--force]      proceed, even though this may destroy valuable data


remove package repository configuration


run a ceph daemon, in a container, in the foreground


  • [--name NAME, -n NAME]  daemon name (type.id)
  • [--fsid FSID]           cluster FSID


Run an interactive shell:

cephadm shell

Or one specific command inside a container:

cephadm shell -- ceph orch ls

Positional arguments:

  • [command]               command (optional)


  • [--fsid FSID]                   cluster FSID
  • [--name NAME, -n NAME]          daemon name (type.id)
  • [--config CONFIG, -c CONFIG]    ceph.conf to pass through to the container
  • [--keyring KEYRING, -k KEYRING] ceph.keyring to pass through to the container
  • [--mount MOUNT, -m MOUNT]       mount a file or directory under /mnt in the container
  • [--env ENV, -e ENV]             set environment variable


Operate on the daemon's systemd unit.

Positional arguments:

  • [command]               systemd command (start, stop, restart, enable, disable, ...)


  • [--fsid FSID]           cluster FSID
  • [--name NAME, -n NAME]  daemon name (type.id)


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

See Also



Mar 19, 2024 dev Ceph