Ansible playbooks for configuration management

                  ---
# Main playbook
- name: Configure web servers
  hosts: webservers
  become: yes
  vars:
    app_name: web-app
    app_user: deploy
    app_dir: /opt/web-app
    node_version: "20"
    nginx_worker_processes: auto

  pre_tasks:
    - name: Update apt cache
      apt:
        update_cache: yes
        cache_valid_time: 3600

  roles:
    - common
    - nodejs
    - nginx
    - app

  handlers:
    - name: restart nginx
      service:
        name: nginx
        state: restarted

    - name: restart app
      systemd:
        name: "{{ app_name }}"
        state: restarted
        daemon_reload: yes

  tasks:
    # System packages
    - name: Install system packages
      apt:
        name:
          - build-essential
          - git
          - curl
          - htop
          - unzip
        state: present
      tags: [packages]

    # Create app user
    - name: Create application user
      user:
        name: "{{ app_user }}"
        system: yes
        shell: /bin/bash
        home: "{{ app_dir }}"
        createhome: yes

    # App directory
    - name: Create app directories
      file:
        path: "{{ item }}"
        state: directory
        owner: "{{ app_user }}"
        group: "{{ app_user }}"
        mode: "0755"
      loop:
        - "{{ app_dir }}"
        - "{{ app_dir }}/releases"
        - "{{ app_dir }}/shared"
        - "{{ app_dir }}/shared/logs"
        - /var/log/{{ app_name }}

    # Deploy app
    - name: Clone application repository
      git:
        repo: "https://github.com/example/{{ app_name }}.git"
        dest: "{{ app_dir }}/releases/{{ app_version }}"
        version: "{{ app_version }}"
      become_user: "{{ app_user }}"
      tags: [deploy]

    # Install dependencies
    - name: Install npm dependencies
      npm:
        path: "{{ app_dir }}/releases/{{ app_version }}"
        production: yes
      become_user: "{{ app_user }}"
      tags: [deploy]

    # Symlink current release
    - name: Symlink current release
      file:
        src: "{{ app_dir }}/releases/{{ app_version }}"
        dest: "{{ app_dir }}/current"
        state: link
        owner: "{{ app_user }}"
      notify: restart app
      tags: [deploy]

    # App environment file
    - name: Create environment file
      template:
        src: templates/env.j2
        dest: "{{ app_dir }}/shared/.env"
        owner: "{{ app_user }}"
        mode: "0600"
      notify: restart app
      tags: [config]

    # Systemd service
    - name: Create systemd service
      template:
        src: templates/app.service.j2
        dest: /etc/systemd/system/{{ app_name }}.service
        mode: "0644"
      notify: restart app
      tags: [service]

    # Nginx config
    - name: Configure nginx site
      template:
        src: templates/nginx.conf.j2
        dest: /etc/nginx/sites-available/{{ app_name }}
        mode: "0644"
      notify: restart nginx
      tags: [nginx]

    - name: Enable nginx site
      file:
        src: /etc/nginx/sites-available/{{ app_name }}
        dest: /etc/nginx/sites-enabled/{{ app_name }}
        state: link
      notify: restart nginx
      tags: [nginx]

    # Enable and start services
    - name: Enable and start app
      systemd:
        name: "{{ app_name }}"
        enabled: yes
        state: started
        daemon_reload: yes
      tags: [service]

    # Firewall
    - name: Configure firewall
      ufw:
        rule: allow
        port: "{{ item }}"
        proto: tcp
      loop:
        - "22"
        - "80"
        - "443"
      tags: [security]

    - name: Enable firewall
      ufw:
        state: enabled
        policy: deny
      tags: [security]