Ansible Role: Docker Swarm

Setup a Docker Swarm cluster on RHEL/CentOS and Debian/Ubuntu servers using the new Docker Engine's "Swarm Mode" (https://docs.docker.com/engine/swarm/).

Requirements

None.

Role Variables

Available variables are listed below, along with default values (see defaults/main.yml):

docker_repo: main
# docker_repo: testing
# docker_repo: experimental

The repo from which install Docker. Override the default to install testing or experimental docker builds.

docker_dependencies: "{{ default_docker_dependencies }}"

Extra packages that have to installed together with Docker. The value of default_docker_dependencies depends on the target OS family.

NB: If you are installing Docker on a Raspberry running Raspbian or any other Debian-like OS make sure to set docker_dependencies: [ ] otherwise Ansible will fail because the linux-image-extra-virtual package is not available for the arm architecture (see issue #4).

skip_engine: False
skip_swarm: False

Setting skip_engine: True will make the role skip the installation of docker-engine. If you want to use this role to just install docker-engine without enabling swarm-mode set skip_swarm: True.

docker_swarm_addr: "{{ ansible_default_ipv4['address'] }}"

Listening address where the raft APIs will be exposed.

docker_swarm_port: 2377

Listening port where the raft APIs will be exposed.

Dependencies

None.

Example Playbook

$ cat inventory
swarm-01 ansible_ssh_host=172.10.10.1
swarm-02 ansible_ssh_host=172.10.10.2
swarm-03 ansible_ssh_host=172.10.10.3

[docker_engine]
swarm-01
swarm-02
swarm-03

[docker_swarm_manager]
swarm-01

[docker_swarm_worker]
swarm-02
swarm-03

$ cat playbook.yml
- name: "Provision Docker Swarm Cluster"
  hosts: all
  roles:
    - { role: atosatto.docker-swarm }

License

MIT

Author Information

Andrea Tosatto (@_hilbert_)