community.docker.docker_swarm – Manage Swarm cluster

Note

This plugin is part of the community.docker collection (version 1.5.0).

To install it use: ansible-galaxy collection install community.docker.

To use it in a playbook, specify: community.docker.docker_swarm.

Synopsis

• Create a new Swarm cluster.

• Add/Remove nodes or managers to an existing cluster.

Requirements

The below requirements are needed on the host that executes this module.

• Docker API >= 1.25

• Docker SDK for Python: Please note that the docker-py Python module has been superseded by docker (see here for details). For Python 2.6, docker-py must be used. Otherwise, it is recommended to install the docker Python module. Note that both modules should not be installed at the same time. Also note that when both modules are installed and one of them is uninstalled, the other might no longer function and a reinstall of it is required.

• Docker SDK for Python >= 1.10.0 (use docker-py for Python 2.6)

Parameters

Parameter	Choices/Defaults	Comments
advertise_addr string		Externally reachable address advertised to other nodes. This can either be an address/port combination in the form 192.168.1.1:4567, or an interface followed by a port number, like eth0:4567. If the port number is omitted, the port number from the listen address is used. If advertise_addr is not specified, it will be automatically detected when possible. Only used when swarm is initialised or joined. Because of this it's not considered for idempotency checking.
api_version string	Default: "auto"	The version of the Docker API running on the Docker Host. Defaults to the latest version of the API supported by Docker SDK for Python and the docker daemon. If the value is not specified in the task, the value of environment variable DOCKER_API_VERSION will be used instead. If the environment variable is not set, the default value will be used. aliases: docker_api_version
autolock_managers boolean	Choices: no yes	If set, generate a key and use it to lock data stored on the managers. Docker default value is no. community.docker.docker_swarm_info can be used to retrieve the unlock key.
ca_cert path		Use a CA certificate when performing server verification by providing the path to a CA certificate file. If the value is not specified in the task and the environment variable DOCKER_CERT_PATH is set, the file ca.pem from the directory specified in the environment variable DOCKER_CERT_PATH will be used. aliases: tls_ca_cert, cacert_path
ca_force_rotate integer		An integer whose purpose is to force swarm to generate a new signing CA certificate and key, if none have been specified. Docker default value is 0. Requires API version >= 1.30.
client_cert path		Path to the client's TLS certificate file. If the value is not specified in the task and the environment variable DOCKER_CERT_PATH is set, the file cert.pem from the directory specified in the environment variable DOCKER_CERT_PATH will be used. aliases: tls_client_cert, cert_path
client_key path		Path to the client's TLS key file. If the value is not specified in the task and the environment variable DOCKER_CERT_PATH is set, the file key.pem from the directory specified in the environment variable DOCKER_CERT_PATH will be used. aliases: tls_client_key, key_path
debug boolean	Choices: no ← yes	Debug mode
default_addr_pool list / elements=string		Default address pool in CIDR format. Only used when swarm is initialised. Because of this it's not considered for idempotency checking. Requires API version >= 1.39.
dispatcher_heartbeat_period integer		The delay for an agent to send a heartbeat to the dispatcher. Docker default value is 5s.
docker_host string	Default: "unix://var/run/docker.sock"	The URL or Unix socket path used to connect to the Docker API. To connect to a remote host, provide the TCP connection string. For example, tcp://192.0.2.23:2376. If TLS is used to encrypt the connection, the module will automatically replace tcp in the connection URL with https. If the value is not specified in the task, the value of environment variable DOCKER_HOST will be used instead. If the environment variable is not set, the default value will be used. aliases: docker_url
election_tick integer		Amount of ticks (in seconds) needed without a leader to trigger a new election. Docker default value is 10s.
force boolean	Choices: no ← yes	Use with state present to force creating a new Swarm, even if already part of one. Use with state absent to Leave the swarm even if this node is a manager.
heartbeat_tick integer		Amount of ticks (in seconds) between each heartbeat. Docker default value is 1s.
join_token string		Swarm token used to join a swarm cluster. Used with state=join. If this value is specified, the corresponding value in the return values will be censored by Ansible. This is a side-effect of this value not being logged.
keep_old_snapshots integer		Number of snapshots to keep beyond the current snapshot. Docker default value is 0.
labels dictionary		User-defined key/value metadata. Label operations in this module apply to the docker swarm cluster. Use community.docker.docker_node module to add/modify/remove swarm node labels. Requires API version >= 1.32.
listen_addr string	Default: "0.0.0.0:2377"	Listen address used for inter-manager communication. This can either be an address/port combination in the form 192.168.1.1:4567, or an interface followed by a port number, like eth0:4567. If the port number is omitted, the default swarm listening port is used. Only used when swarm is initialised or joined. Because of this it's not considered for idempotency checking.
log_entries_for_slow_followers integer		Number of log entries to keep around to sync up slow followers after a snapshot is created.
name string		The name of the swarm.
node_cert_expiry integer		Automatic expiry for nodes certificates. Docker default value is 3months.
node_id string		Swarm id of the node to remove. Used with state=remove.
remote_addrs list / elements=string		Remote address of one or more manager nodes of an existing Swarm to connect to. Used with state=join.
rotate_manager_token boolean	Choices: no ← yes	Rotate the manager join token.
rotate_worker_token boolean	Choices: no ← yes	Rotate the worker join token.
signing_ca_cert string		The desired signing CA certificate for all swarm node TLS leaf certificates, in PEM format. This must not be a path to a certificate, but the contents of the certificate. Requires API version >= 1.30.
signing_ca_key string		The desired signing CA key for all swarm node TLS leaf certificates, in PEM format. This must not be a path to a key, but the contents of the key. Requires API version >= 1.30.
snapshot_interval integer		Number of logs entries between snapshot. Docker default value is 10000.
ssl_version string		Provide a valid SSL version number. Default value determined by ssl.py module. If the value is not specified in the task, the value of environment variable DOCKER_SSL_VERSION will be used instead.
state string	Choices: present ← join absent remove	Set to present, to create/update a new cluster. Set to join, to join an existing cluster. Set to absent, to leave an existing cluster. Set to remove, to remove an absent node from the cluster. Note that removing requires Docker SDK for Python >= 2.4.0.
subnet_size integer		Default address pool subnet mask length. Only used when swarm is initialised. Because of this it's not considered for idempotency checking. Requires API version >= 1.39.
task_history_retention_limit integer		Maximum number of tasks history stored. Docker default value is 5.
timeout integer	Default: 60	The maximum amount of time in seconds to wait on a response from the API. If the value is not specified in the task, the value of environment variable DOCKER_TIMEOUT will be used instead. If the environment variable is not set, the default value will be used.
tls boolean	Choices: no ← yes	Secure the connection to the API by using TLS without verifying the authenticity of the Docker host server. Note that if validate_certs is set to yes as well, it will take precedence. If the value is not specified in the task, the value of environment variable DOCKER_TLS will be used instead. If the environment variable is not set, the default value will be used.
tls_hostname string	Default: "localhost"	When verifying the authenticity of the Docker Host server, provide the expected name of the server. If the value is not specified in the task, the value of environment variable DOCKER_TLS_HOSTNAME will be used instead. If the environment variable is not set, the default value will be used.
use_ssh_client boolean added in 1.5.0 of community.docker	Choices: no ← yes	For SSH transports, use the ssh CLI tool instead of paramiko. Requires Docker SDK for Python 4.4.0 or newer.
validate_certs boolean	Choices: no ← yes	Secure the connection to the API by using TLS and verifying the authenticity of the Docker host server. If the value is not specified in the task, the value of environment variable DOCKER_TLS_VERIFY will be used instead. If the environment variable is not set, the default value will be used. aliases: tls_verify

Notes

Note

• Connect to the Docker daemon by providing parameters with each task or by defining environment variables. You can define DOCKER_HOST, DOCKER_TLS_HOSTNAME, DOCKER_API_VERSION, DOCKER_CERT_PATH, DOCKER_SSL_VERSION, DOCKER_TLS, DOCKER_TLS_VERIFY and DOCKER_TIMEOUT. If you are using docker machine, run the script shipped with the product that sets up the environment. It will set these variables for you. See https://docs.docker.com/machine/reference/env/ for more details.

• When connecting to Docker daemon with TLS, you might need to install additional Python packages. For the Docker SDK for Python, version 2.4 or newer, this can be done by installing docker[tls] with ansible.builtin.pip.

• Note that the Docker SDK for Python only allows to specify the path to the Docker configuration for very few functions. In general, it will use $HOME/.docker/config.json if the DOCKER_CONFIG environment variable is not specified, and use $DOCKER_CONFIG/config.json otherwise.

• This module uses the Docker SDK for Python to communicate with the Docker daemon.

Examples

- name: Init a new swarm with default parameters
  community.docker.docker_swarm:
    state: present

- name: Update swarm configuration
  community.docker.docker_swarm:
    state: present
    election_tick: 5

- name: Add nodes
  community.docker.docker_swarm:
    state: join
    advertise_addr: 192.168.1.2
    join_token: SWMTKN-1--xxxxx
    remote_addrs: [ '192.168.1.1:2377' ]

- name: Leave swarm for a node
  community.docker.docker_swarm:
    state: absent

- name: Remove a swarm manager
  community.docker.docker_swarm:
    state: absent
    force: true

- name: Remove node from swarm
  community.docker.docker_swarm:
    state: remove
    node_id: mynode

Return Values

Common return values are documented here, the following are the fields unique to this module:

Key			Returned	Description
actions list / elements=string			when action failed.	Provides the actions done on the swarm. Sample: ['This cluster is already a swarm cluster']
swarm_facts dictionary			success	Informations about swarm.
	JoinTokens dictionary		success	Tokens to connect to the Swarm.
		Manager string	success	Token to join the cluster as a new *manager* node. Note: if this value has been specified as join_token, the value here will not be the token, but VALUE_SPECIFIED_IN_NO_LOG_PARAMETER. If you pass join_token, make sure your playbook/role does not depend on this return value! Sample: SWMTKN-1--xxxxx
		Worker string	success	Token to join the cluster as a new *worker* node. Note: if this value has been specified as join_token, the value here will not be the token, but VALUE_SPECIFIED_IN_NO_LOG_PARAMETER. If you pass join_token, make sure your playbook/role does not depend on this return value! Sample: SWMTKN-1--xxxxx
	UnlockKey string		on success if autolock_managers is true and swarm is initialised, or if autolock_managers has changed.	The swarm unlock-key if autolock_managers is true. Sample: SWMKEY-1-xxx

Authors

• Thierry Bouvet (@tbouvet)

• Piotr Wojciechowski (@WojciechowskiPiotr)