community.docker.docker_swarm inventory – Ansible dynamic inventory plugin for Docker swarm nodes.

Note

This inventory plugin is part of the community.docker collection (version 2.6.0).

You might already have this collection installed if you are using the ansible package. It is not included in ansible-core. To check whether it is installed, run ansible-galaxy collection list.

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

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

Synopsis

  • Reads inventories from the Docker swarm API.

  • Uses a YAML configuration file docker_swarm.[yml|yaml].

  • The plugin returns following groups of swarm nodes: all - all hosts; workers - all worker nodes; managers - all manager nodes; leader - the swarm leader node; nonleaders - all nodes except the swarm leader.

Requirements

The below requirements are needed on the local controller node that executes this inventory.

Parameters

Parameter

Comments

api_version

aliases: docker_api_version

string

The version of the Docker API running on the Docker Host.

Defaults to the latest version of the API supported by docker-py.

ca_cert

aliases: tls_ca_cert, cacert_path

path

Use a CA certificate when performing server verification by providing the path to a CA certificate file.

client_cert

aliases: tls_client_cert, cert_path

path

Path to the client’s TLS certificate file.

client_key

aliases: tls_client_key, key_path

path

Path to the client’s TLS key file.

compose

dictionary

Create vars from jinja2 expressions.

Default: {}

docker_host

aliases: docker_url

string / required

Socket of a Docker swarm manager node (tcp, unix).

Use unix://var/run/docker.sock to connect via local socket.

groups

dictionary

Add hosts to group based on Jinja2 conditionals.

Default: {}

include_host_uri

boolean

Toggle to return the additional attribute ansible_host_uri which contains the URI of the swarm leader in format of tcp://172.16.0.1:2376. This value may be used without additional modification as value of option docker_host in Docker Swarm modules when connecting via API. The port always defaults to 2376.

Choices:

  • no ← (default)

  • yes

include_host_uri_port

integer

Override the detected port number included in ansible_host_uri

keyed_groups

list / elements=dictionary

Add hosts to group based on the values of a variable.

Default: []

default_value

string

added in 2.12 of ansible.builtin

The default value when the host variable’s value is an empty string.

This option is mutually exclusive with trailing_separator.

key

string

The key from input dictionary used to generate groups

parent_group

string

parent group for keyed group

prefix

string

A keyed group name will start with this prefix

Default: “”

separator

string

separator used to build the keyed group name

Default: “_”

trailing_separator

boolean

added in 2.12 of ansible.builtin

Set this option to False to omit the separator after the host variable when the value is an empty string.

This option is mutually exclusive with default_value.

Choices:

  • no

  • yes ← (default)

leading_separator

boolean

added in 2.11 of ansible.builtin

Use in conjunction with keyed_groups.

By default, a keyed group that does not have a prefix or a separator provided will have a name that starts with an underscore.

This is because the default prefix is “” and the default separator is “_”.

Set this option to False to omit the leading underscore (or other separator) if no prefix is given.

If the group name is derived from a mapping the separator is still used to concatenate the items.

To not use a separator in the group name at all, set the separator for the keyed group to an empty string instead.

Choices:

  • no

  • yes ← (default)

plugin

string / required

The name of this plugin, it should always be set to community.docker.docker_swarm for this plugin to recognize it as it’s own.

Choices:

  • docker_swarm

  • community.docker.docker_swarm

ssl_version

string

Provide a valid SSL version number. Default value determined by ssl.py module.

strict

boolean

If yes make invalid entries a fatal error, otherwise skip and continue.

Since it is possible to use facts in the expressions they might not always be available and we ignore those errors by default.

Choices:

  • no ← (default)

  • yes

timeout

aliases: time_out

integer

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.

Default: 60

tls

boolean

Connect using TLS without verifying the authenticity of the Docker host server.

Choices:

  • no ← (default)

  • yes

tls_hostname

string

When verifying the authenticity of the Docker host server, provide the expected name of the server.

use_extra_vars

boolean

added in 2.11 of ansible.builtin

Merge extra vars into the available variables for composition (highest precedence).

Choices:

  • no ← (default)

  • yes

Configuration:

  • INI entry:

    [inventory_plugins]
use_extra_vars = no

  • Environment variable: ANSIBLE_INVENTORY_USE_EXTRA_VARS

use_ssh_client

boolean

added in 1.5.0 of community.docker

For SSH transports, use the ssh CLI tool instead of paramiko.

Requires Docker SDK for Python 4.4.0 or newer.

Choices:

  • no ← (default)

  • yes

validate_certs

aliases: tls_verify

boolean

Toggle if connecting using TLS with or without verifying the authenticity of the Docker host server.

Choices:

  • no ← (default)

  • yes

verbose_output

boolean

Toggle to (not) include all available nodes metadata (for example Platform, Architecture, OS, EngineVersion)

Choices:

  • no

  • yes ← (default)

Examples

# Minimal example using local docker
plugin: community.docker.docker_swarm
docker_host: unix://var/run/docker.sock

# Minimal example using remote docker
plugin: community.docker.docker_swarm
docker_host: tcp://my-docker-host:2375

# Example using remote docker with unverified TLS
plugin: community.docker.docker_swarm
docker_host: tcp://my-docker-host:2376
tls: yes

# Example using remote docker with verified TLS and client certificate verification
plugin: community.docker.docker_swarm
docker_host: tcp://my-docker-host:2376
validate_certs: yes
ca_cert: /somewhere/ca.pem
client_key: /somewhere/key.pem
client_cert: /somewhere/cert.pem

# Example using constructed features to create groups and set ansible_host
plugin: community.docker.docker_swarm
docker_host: tcp://my-docker-host:2375
strict: False
keyed_groups:
  # add for example x86_64 hosts to an arch_x86_64 group
  - prefix: arch
    key: 'Description.Platform.Architecture'
  # add for example linux hosts to an os_linux group
  - prefix: os
    key: 'Description.Platform.OS'
  # create a group per node label
  # for exomple a node labeled w/ "production" ends up in group "label_production"
  # hint: labels containing special characters will be converted to safe names
  - key: 'Spec.Labels'
    prefix: label

Authors

  • Stefan Heitmüller (@morph027)

Hint

Configuration entries for each entry type have a low to high priority order. For example, a variable that is lower in the list will override a variable that is higher up.