使用with_items在同一个循环中的Ansible循环

Posted 2021-04-29

[寻求帮助，试图在多个池中循环，而某些池可能具有多个主机。我尝试做with_nested和with_subelements，但似乎都没有做到我想要的。

- name: Pool members
  bigip_pool_member:
    state: present
    pool: "{{ item.pool }}"
    partition: Common
    host: "{{ item.host }}"
    port: "{{ item.port }}"
    provider:
      server: bigip.domain.com
      user: admin
      password: admin
      validate_certs: no
  delegate_to: localhost
  with_items:
    - { pool: pool, host: [10.10.10.10, 10.10.10.11], port: 80 }
    - { pool: pool2, host: 10.10.10.10, port: 80 }

我相信host字段一次只能取一个值，因此我需要遍历一个池的主机。输出将类似于

  bigip_pool_member:
    state: present
    pool: pool
    partition: Common
    host: 10.10.10.10
    port: 80

  bigip_pool_member:
    state: present
    pool: pool
    partition: Common
    host: 10.10.10.11
    port: 80

  bigip_pool_member:
    state: present
    pool: pool2
    partition: Common
    host: 10.10.10.10
    port: 80

答案

循环subelements是您要寻找的。例如，请参阅下面的手册，以了解如何引用所需的属性

- hosts: localhost
  vars:
    my_pools:
      - {pool: pool, host: [10.10.10.10, 10.10.10.11], port: 80}
      - {pool: pool2, host: [10.10.10.10], port: 80}
  tasks:
    - debug:
        msg: "pool:{{ item.0.pool }} port:{{ item.0.port }} host:{{ item.1 }}"
      with_subelements:
        - "{{ my_pools }}"
        - host

给予

    "msg": "pool:pool port:80 host:10.10.10.10"
    "msg": "pool:pool port:80 host:10.10.10.11"
    "msg": "pool:pool2 port:80 host:10.10.10.10"

注意

• 简单地将对属性的引用放入您的代码中。
• 保持一致。即使列表仅包含一项，属性host也必须是列表。
• 使用loop代替with_subelements

      loop: "{{lookup('subelements', my_pools, 'host', {'skip_missing': True})}}"

---

以下是经过最少的更改即可使其正常工作的任务

- name: Pool members
  bigip_pool_member:
    state: present
    pool: "{{ item.0.pool }}"
    partition: Common
    host: "{{ item.1 }}"
    port: "{{ item.0.port }}"
    provider:
      server: bigip.domain.com
      user: admin
      password: admin
      validate_certs: no
  delegate_to: localhost
  with_subelements:
    - - {pool: pool, host: [10.10.10.10, 10.10.10.11], port: 80}
      - {pool: pool2, host: [10.10.10.10], port: 80}
    - host

^{（未测试）}