auto_scale.yml

---

- hosts: network
  tasks:                                                     
  - name: Create docker network
    docker_network:
      name: "{{ network_name }}"
      ipam_config:
        - subnet: "{{ subnet }}.0/16"
          gateway: "{{ subnet }}.1"

- hosts: local
  gather_facts: no
  tasks:

  - name: get last scale
    script: ./get_cont_num.sh {{ image_name }}
    register: last_scale

  - set_fact: 
      last_scale={{ last_scale.stdout }}
  
  - debug: var=last_scale

  - name : start container
    docker_container:
      name: "{{ c_name }}_{{ item }}"
      image : "{{ image_name }}"
      pull: yes
      restart_policy: always
      hostname: "{{ h_name }}_{{ item }}"
      networks:
        - name: "{{ network_name }}"
          ipv4_address: "{{ subnet }}.{{ 1+item|int }}"
      purge_networks: yes
    with_sequence: start=1 end="{{ scale }}"

    
  - name : down-scaling uneeded containers 
    docker_container: 
      name: mongo_{{ item }}
      state: absent
    with_sequence: start="{{ last_scale|int if (last_scale|int - scale|int)|abs == 1|int  or last_scale|int == scale|int  or scale|int > last_scale|int else 1+scale|int  }}" end="{{ last_scale }}" 
    # last_scale=4 scale=2
    # last_scale=3 scale=3
    # last_scale=3 scale=4 
    # last_scale=2 scale=4
    when: scale|int < last_scale|int



  # - name : generate env variables 
  #   shell : ./get_name_ip.sh {{ scale }} 
  - name: generate  ip 
    script: ./get_name_ip.sh {{ scale }}
    register: last_scale
    
  - set_fact: 
        list_ip={{ last_scale.stdout.split("\r\n")|list }}

  - name : generate file 
    template : 
        src: example.domaine.com.conf.j2
        dest: example.domaine.com.conf


  # - name: Verify Nginx config
  #   become: yes
  #   command: nginx -t
  #   changed_when: false

  # - name: reload Nginx config
  #   become: yes
  #   command: nginx -s reload
  #   changed_when: false

        
      
- hosts : clean
  gather_facts : no 

  tasks: 

  - name: Removing exited containers
    shell: docker ps -a -q -f status=exited | xargs --no-run-if-empty docker rm --volumes
  - name: Removing untagged images
    shell: docker images | awk '/^<none>/ { print $3 }' | xargs --no-run-if-empty docker rmi -f
  - name: Removing volume directories
    shell: docker volume ls -q --filter="dangling=true" | xargs --no-run-if-empty docker volume rm