使用 Ansible Playbook自动化部署 Web 应用程序或数据库服务器，展示详细示例代码

当然可以，以下是一个使用 Ansible Playbook 自动化部署 Web 应用程序和数据库服务器的示例代码：

---
- name: Deploy web application and database server
  hosts: all
  become: true
  vars:
    app_name: myapp
    app_port: 8080
    db_name: mydb
    db_user: myuser
    db_password: mypassword
    db_port: 3306
  tasks:
    # Install required packages
    - name: Install required packages
      apt:
        name: "{{ item }}"
        state: present
      with_items:
        - apache2
        - libapache2-mod-wsgi
        - python-dev
        - python-pip
        - mysql-server
        - libmysqlclient-dev

    # Configure Apache
    - name: Configure Apache
      template:
        src: apache.conf.j2
        dest: /etc/apache2/sites-available/{{ app_name }}.conf
      notify: Restart Apache

    # Configure WSGI
    - name: Configure WSGI
      template:
        src: wsgi.conf.j2
        dest: /var/www/{{ app_name }}/wsgi.py

    # Copy application files
    - name: Copy application files
      copy:
        src: "{{ playbook_dir }}/files/{{ app_name }}"
        dest: /var/www/{{ app_name }}/
      notify: Restart Apache

    # Create database
    - name: Create database
      mysql_db:
        name: "{{ db_name }}"
        state: present
        login_user: root
        login_password: ""

    # Create database user
    - name: Create database user
      mysql_user:
        name: "{{ db_user }}"
        password: "{{ db_password }}"
        priv: "{{ db_name }}.*:ALL"
        state: present
        login_user: root
        login_password: ""

    # Configure Django settings
    - name: Configure Django settings
      lineinfile:
        path: /var/www/{{ app_name }}/settings.py
        regexp: '^DATABASES'
        line: "DATABASES = {\n    'default': {\n        'ENGINE': 'django.db.backends.mysql',\n        'NAME': '{{ db_name }}',\n        'USER': '{{ db_user }}',\n        'PASSWORD': '{{ db_password }}',\n        'HOST': 'localhost',\n        'PORT': '{{ db_port }}',\n    }\n}"

  handlers:
    # Restart Apache
    - name: Restart Apache
      service:
        name: apache2
        state: restarted

这个 Ansible Playbook 部署了一个名为 `myapp` 的 Web 应用程序，使用 Apache 和 WSGI 来运行 Python Web 应用程序。它还配置了一个名为 `mydb` 的 MySQL 数据库，使用 Django ORM 访问数据库。在实际应用中，需要根据具体情况进行调整和优化。