do-swarm.yml

---
- hosts: digitalocean

  tasks:
  - name: include vars
    include_vars:
      file: vars.yml
      name: global

  - digital_ocean_sshkey_facts:
      oauth_token: "{{ do_token }}"

  - set_fact:
      pubkey: "{{ item.id }}"
    with_items: "{{ ssh_keys|json_query(global.ssh_pubkey) }}"

  - name: create droplet 
    digital_ocean: >
      state=present
      command=droplet
      name={{ item }}
      size_id={{ global.do_size }}
      unique_name=yes
      region_id={{ global.do_region }}
      image_id=docker-18-04
      ssh_key_ids={{ pubkey }}
      api_token={{ do_token }}
    with_items: "{{ global.droplets }}"
    register: droplet_details

  - name: gen inventory worker
    add_host: name={{ item.droplet.name }} ansible_host={{ item.droplet.ip_address }} ansible_user=root groups=do
    with_items: "{{ droplet_details.results }}"

  - name: before actions to hosts
    pause: seconds="30"
    when: droplet_details.changed

################################

- hosts: do
  gather_facts: False

  tasks:
  - name: include vars
    include_vars:
      file: vars.yml
      name: global

  - name: install python
    raw: test -e /usr/bin/python || (apt -y update && apt install -y python-minimal python-apt)

  - name: install packages base 
    apt: name={{ packages }} state=present
    vars:
      packages:
      - python-pip

  - name: install docker py
    pip: name=docker state=present version=2.6

  - name: delete rules docker ufw
    ufw: rule=allow port={{ item }} proto=tcp delete=yes
    with_items:
      - 2375
      - 2376

  - name: open firewall ufw for cluster
    ufw: rule=allow src={{ hostvars[item]['ansible_host'] }}
    with_inventory_hostnames:
      - do
    when: inventory_hostname != "hostvars[item]['name']"

  - name: init swarm
    docker_swarm: state=present advertise_addr="{{ ansible_host }}"
    when: inventory_hostname == global.droplets[0]
    register: swarm_info

  - name: add nodes
    docker_swarm:
      state: join
      advertise_addr: "{{ ansible_host }}"
      join_token: "{{ hostvars[global.droplets[0]].swarm_info.swarm_facts.JoinTokens.Worker }}"
      remote_addrs: [ "{{ hostvars[global.droplets[0]].ansible_host }}:2377" ]
    when: inventory_hostname != global.droplets[0]