Deploy a docker service using Ansible within Docker Swarm 1.12

ansible-docker-network.yml

---
- name: Check if network {{ name }} exists
  delegate_to: "{{ groups['docker_swarm_issuer'][0] }}"
  run_once: true
  command: docker network ls -q --filter name=^{{ name }}$
  register: network_exists
  changed_when: false

- name: Create network {{ name }}
  command: docker network create --driver {{ driver }} {{ name }}
  when: network_exists.stdout == ""
  delegate_to: "{{ groups['docker_swarm_issuer'][0] }}"
  run_once: true

ansible-docker-service-defaults.yml

registry: 127.0.0.1:5000

networks: []

ansible-docker-service.yml

---

- name: Pull git repository for service {{ name }}
  git:
    repo: "{{ repo }}"
    dest: "/tmp/{{ name }}"
    accept_hostkey: true
  when: repo is defined

- set_fact:
    image: "{{ registry }}/{{ name }}"
  when: repo is defined

- name: Build image {{ image }}
  docker_image:
    name: "{{ image }}"
    path: "/tmp/{{ name }}"
    push: yes
    force: yes
  when: repo is defined

# Create networks if needed
- include: ../../docker-network/tasks/main.yml
  vars:
    name: "{{ item }}"
    driver: overlay
  with_items: "{{ networks | default([]) }}"

# Deploy service

- name: "Service {{ name }} is created"
  shell: docker service ls --filter name={{ name }} | grep '\s{{ name }}\s' | awk '{ print $1 }'
  register: service_exists
  changed_when: false

- name: "Service {{ name }} is running"
  shell: docker service ls --filter name={{ name }} | grep '\s{{ name }}\s' | awk '{ printf $3 }' | sed 's/\([0-9]\)\+.*/\1/'
  register: running_replicas
  when: service_exists.stdout != "" 
  failed_when: running_replicas.stdout == "0"
  changed_when: false

- fail: msg="The service {{ name }} is down"
  when: running_replicas is defined and running_replicas.stdout == "0"

- set_fact:
    networks_flags: "{{ networks|default([]) | map('regex_replace', '^(.*)$', '--network \\1') | list | join(' ') }}"
    volumes_flags: "{{ volumes|default([]) | map('regex_replace', '^(.*)$', '--mount \\1') | list | join(' ') }}"
    ports_flags: "{{ ports|default([]) | map('regex_replace', '^(.*)$', '-p \\1') | list | join(' ') }}" 
    additional_flags: "{{ additional_args|default('') | replace('\n', '') }}"
    labels_flags: "{{ labels|default([]) | map('regex_replace', '^(.*)$', '--label \\1') | list | join(' ') }}"
    env_flags: "{{ env|default([]) | map('regex_replace', '^(.*)$', '-e \"\\1\"') | list | join(' ') }}"

- set_fact:
    replicas_flags: "{{ replicas | regex_replace('^(.*)$', '--replicas \\1') }}"
  when: replicas is defined

- set_fact:
    replicas_flags: ""
  when: replicas is not defined

- set_fact:
    virtual_host_env_var: "{{ virtual_host | regex_replace('^(.*)$', '--env VIRTUAL_HOST=\\1') }}"
  when: virtual_host is defined

- set_fact:
    virtual_host_env_var: ""
  when: virtual_host is not defined

# - debug: var=networks_flags
# - debug: var=volumes_flags
# - debug: var=ports_flags
# - debug: var=replicas_flags
# - debug: var=additional_flags

- name: "Create service {{  name }}"
  shell: "docker service create --name {{ name }} {{ env_flags }} {{ virtual_host_env_var }} {{ replicas_flags }} {{ networks_flags }} {{ ports_flags }} {{ volumes_flags }} {{ labels_flags }} {{ additional_flags }} {{ image }} {{ command | default() }}"
  when: service_exists.stdout == ""