在Ansible中连接角色有多种方式，包括使用meta、rolename或import_role。以下是这些方法的代码示例：

1. 使用meta连接角色：

- hosts: servers
  roles:
    - { role: common, tags: common }
    - { role: webserver, tags: webserver }
    - { role: database, tags: database }

- hosts: servers
  tasks:
    - name: Connect roles using meta
      meta: clear_host_errors
      tags: common

    - name: Connect webserver role using meta
      meta: flush_handlers
      tags: webserver

    - name: Connect database role using meta
      meta: refresh_inventory
      tags: database

2. 使用rolename连接角色：

- hosts: servers
  tasks:
    - name: Include common role
      include_role:
        name: common
      tags: common

    - name: Include webserver role
      include_role:
        name: webserver
      tags: webserver

    - name: Include database role
      include_role:
        name: database
      tags: database

3. 使用import_role连接角色：

- hosts: servers
  tasks:
    - name: Import common role
      import_role:
        name: common
      tags: common

    - name: Import webserver role
      import_role:
        name: webserver
      tags: webserver

    - name: Import database role
      import_role:
        name: database
      tags: database

以上示例中，common、webserver和database是角色的名称，可以根据实际情况进行更改。使用标签可以根据需要选择特定的任务运行。