olimp/roles/docker/tasks/main.yml

---
# =============================================================================
# DOCKER
# =============================================================================

# ========== 1. Cleanup conflicting Docker configs ==========
- name: Remove conflicting Docker repository files
  file:
    path: "{{ item }}"
    state: absent
  loop:
    - /etc/apt/sources.list.d/download_docker_com_linux_ubuntu.list
    - /etc/apt/sources.list.d/docker-ce.list
    - /etc/apt/sources.list.d/docker.list
  become: yes
  tags: [docker, deploy_docker]

- name: Remove old Docker GPG keys
  file:
    path: "{{ item }}"
    state: absent
  loop:
    - /etc/apt/keyrings/docker.gpg
    - /etc/apt/keyrings/docker.asc
    - /usr/share/keyrings/docker-archive-keyring.gpg
    - /usr/share/keyrings/docker.gpg
  become: yes
  tags: [docker, deploy_docker]

- name: Clean apt cache
  apt:
    clean: yes
  become: yes
  tags: [docker, deploy_docker]

- name: Remove apt lists cache
  file:
    path: /var/lib/apt/lists
    state: absent
  become: yes
  tags: [docker, deploy_docker]

# ========== 2. Install Docker dependencies ==========
- name: Install Docker dependencies
  apt:
    name:
      - apt-transport-https
      - ca-certificates
      - curl
      - gnupg
      - lsb-release
    state: present
    update_cache: yes
  become: yes
  tags: [docker, deploy_docker]

# ========== 3. Setup GPG key ==========
- name: Create keyrings directory
  file:
    path: /etc/apt/keyrings
    state: directory
    mode: '0755'
  become: yes
  tags: [docker, deploy_docker]

- name: Download Docker GPG key
  get_url:
    url: https://download.docker.com/linux/ubuntu/gpg
    dest: /etc/apt/keyrings/docker.asc
    mode: '0644'
    force: yes
  become: yes
  tags: [docker, deploy_docker]

- name: Dearmor Docker GPG key
  shell: gpg --dearmor -o /etc/apt/keyrings/docker.gpg /etc/apt/keyrings/docker.asc
  args:
    creates: /etc/apt/keyrings/docker.gpg
  become: yes
  tags: [docker, deploy_docker]

- name: Set permissions on Docker GPG key
  file:
    path: /etc/apt/keyrings/docker.gpg
    mode: 'a+r'
  become: yes
  tags: [docker, deploy_docker]

# ========== 4. Add Docker repository ==========
- name: Add Docker repository
  copy:
    content: |
      deb [arch={{ ansible_architecture }} signed-by=/etc/apt/keyrings/docker.gpg] https://download.docker.com/linux/ubuntu {{ ansible_distribution_release }} stable      
    dest: /etc/apt/sources.list.d/docker.list
    mode: '0644'
  become: yes
  tags: [docker, deploy_docker]

- name: Update apt cache after adding Docker repo
  apt:
    update_cache: yes
    cache_valid_time: 0
  become: yes
  tags: [docker, deploy_docker]

# ========== 5. Install Docker packages ==========
- name: Install docker-ce and docker-ce-cli first
  apt:
    name:
      - "docker-ce=5:28.2.2-1~ubuntu.{{ ansible_distribution_release }}~noble"
      - "docker-ce-cli=5:28.2.2-1~ubuntu.{{ ansible_distribution_release }}~noble"
    state: present
    allow_downgrade: yes
    allow_change_held_packages: yes
  become: yes
  tags: [docker, deploy_docker]

- name: Install containerd.io (after docker-ce to preserve runc)
  apt:
    name: "containerd.io=1.7.28-1~ubuntu.{{ ansible_distribution_release }}~noble"
    state: present
    allow_downgrade: yes
    allow_change_held_packages: yes
  become: yes
  notify: restart docker
  tags: [docker, deploy_docker]

# ========== 6. Start Docker and configure user ==========
- name: Start and enable Docker service
  systemd:
    name: docker
    state: started
    enabled: yes
    daemon_reload: yes
  become: yes
  tags: [docker, deploy_docker]

- name: Wait for Docker socket to be available
  wait_for:
    path: /var/run/docker.sock
    timeout: 30
  tags: [docker, deploy_docker]

- name: Add admin user to docker group
  user:
    name: "{{ admin_user | default('zailon') }}"
    groups: docker
    append: yes
  become: yes
  tags: [docker, deploy_docker]

# ========== 7. Verify installation ==========
- name: Verify Docker installation
  command: docker --version
  register: docker_version
  changed_when: false
  tags: [docker, deploy_docker]

- name: Show Docker version
  debug:
    msg: "Docker version: {{ docker_version.stdout }}"
  tags: [docker, deploy_docker]

- name: Verify Docker Compose installation
  command: docker compose version
  register: docker_compose_version
  changed_when: false
  tags: [docker, deploy_docker]

- name: Show Docker Compose version
  debug:
    msg: "Docker Compose version: {{ docker_compose_version.stdout }}"
  tags: [docker, deploy_docker]

- name: Test Docker with docker ps
  command: docker ps
  register: docker_ps_test
  changed_when: false
  tags: [docker, deploy_docker]

- name: Show Docker containers
  debug:
    msg: "Docker is working! Containers: {{ docker_ps_test.stdout_lines | default(['none']) }}"
  tags: [docker, deploy_docker]

# ========== 8. Docker monitoring (optional) ==========
- name: Setup Docker monitoring for Node Exporter
  block:
    - name: Deploy Docker metrics script
      copy:
        content: |
          #!/bin/bash
          OUTFILE="/var/lib/node_exporter/textfile_collector/docker_metrics.prom"
          TOTAL_CONTAINERS=$(docker ps -a -q 2>/dev/null | wc -l)
          RUNNING_CONTAINERS=$(docker ps -q 2>/dev/null | wc -l)
          EXITED_CONTAINERS=$((TOTAL_CONTAINERS - RUNNING_CONTAINERS))
          cat << EOF > $OUTFILE
          # HELP docker_containers_total Total number of Docker containers
          # TYPE docker_containers_total gauge
          docker_containers_total $TOTAL_CONTAINERS
          # HELP docker_containers_running Number of running Docker containers
          # TYPE docker_containers_running gauge
          docker_containers_running $RUNNING_CONTAINERS
          # HELP docker_containers_exited Number of exited Docker containers
          # TYPE docker_containers_exited gauge
          docker_containers_exited $EXITED_CONTAINERS
          EOF          
        dest: /opt/scripts/docker_metrics.sh
        mode: '0755'
      become: yes

    - name: Ensure Node Exporter textfile directory exists
      file:
        path: /var/lib/node_exporter/textfile_collector
        state: directory
        owner: node_exporter
        group: node_exporter
        mode: '0755'
      become: yes

    - name: Enable Docker metrics timer
      systemd:
        name: docker-metrics.timer
        enabled: yes
        state: started
        daemon_reload: yes
      become: yes
  when: enable_docker_monitoring | default(true)
  tags: [docker, monitoring]