olimp/roles/docker/tasks/main.yml

---

# ========== Cleanup conflicting Docker repo configs (LXC safety) ==========
- 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
    - /usr/share/keyrings/docker-archive-keyring.gpg
    - /usr/share/keyrings/docker.gpg
  become: yes
  tags: [docker, deploy_docker]

# ========== Fix runc BEFORE Docker install (LXC safety) ==========
- name: Ensure runc at safe version before Docker install (LXC only)
  apt:
    name: "runc=1.1.12-0ubuntu3"
    state: present
    allow_downgrade: yes
    allow_change_held_packages: yes
  become: yes
  tags: [docker, deploy_docker]
  when: ansible_virtualization_type in ['lxc', 'container']

# ========== Install Docker ==========
- 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]

- name: Create keyrings directory
  file:
    path: /etc/apt/keyrings
    state: directory
    mode: '0755'
  become: yes
  tags: [docker, deploy_docker]

- name: Add Docker GPG key
  apt_key:
    url: https://download.docker.com/linux/ubuntu/gpg
    keyring: /etc/apt/keyrings/docker.gpg
    state: present
  become: yes
  tags: [docker, deploy_docker]

- name: Add Docker repository (without cache update)
  apt_repository:
    repo: "deb [arch=amd64 signed-by=/etc/apt/keyrings/docker.gpg] https://download.docker.com/linux/ubuntu {{ ansible_distribution_release }} stable"
    filename: docker
    state: present
    update_cache: no  # ← Важно: не обновлять кэш здесь!
  become: yes
  tags: [docker, deploy_docker]

- name: Update apt cache after adding Docker repo
  apt:
    update_cache: yes
    cache_valid_time: 3600
  become: yes
  tags: [docker, deploy_docker]

- name: Install Docker packages
  apt:
    name:
      - docker-ce
      - docker-ce-cli
      - containerd.io
    state: present
    allow_downgrade: yes
    allow_change_held_packages: yes
  become: yes
  notify: restart docker
  tags: [docker, deploy_docker]

- name: Install Docker Compose plugin
  apt:
    name: docker-compose-plugin
    state: present
  become: yes
  tags: [docker, deploy_docker]

- 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 to start
  pause:
    seconds: 5
  tags: [docker, deploy_docker]

- 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]

# ========== Docker Monitoring Setup ==========
- name: Setup Docker monitoring
  block:
    - name: Create scripts directory
      file:
        path: /opt/scripts
        state: directory
        mode: '0755'
      become: yes

    - 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: Create systemd service for Docker metrics
      copy:
        content: |
          [Unit]
          Description=Docker metrics script
          After=docker.service
          [Service]
          User=root
          ExecStart=/opt/scripts/docker_metrics.sh          
        dest: /etc/systemd/system/docker-metrics.service
        mode: '0644'
      become: yes

    - name: Create systemd timer for Docker metrics
      copy:
        content: |
          [Unit]
          Description=Run Docker metrics every 30 seconds
          [Timer]
          OnBootSec=1min
          OnUnitActiveSec=30s
          [Install]
          WantedBy=timers.target          
        dest: /etc/systemd/system/docker-metrics.timer
        mode: '0644'
      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 and start Docker metrics timer
      systemd:
        name: docker-metrics.timer
        enabled: yes
        state: started
        daemon_reload: yes
      become: yes

    - name: Test Docker metrics script
      command: /opt/scripts/docker_metrics.sh
      register: metrics_test
      changed_when: false

    - name: Show Docker metrics test result
      debug:
        var: metrics_test.stdout
  tags: [docker, deploy_docker, monitoring]