如何在 Ansible 中打破循环？

Question

想要在 item 的值变为 7 后中断任务，这是示例任务

   - hosts: localhost
     tasks:
       - shell: echo {{ item }}
         register: result
         with_sequence: start=4 end=16
         when: "{{ item }} < 7"

在上面的代码中，它将任务从 4 迭代到 16，如下所示

PLAY [localhost] ***********************************************************************************************************************************************

TASK [Gathering Facts] *****************************************************************************************************************************************
ok: [localhost]

TASK [command] *************************************************************************************************************************************************
 [WARNING]: when statements should not include jinja2 templating delimiters such as {{ }} or {% %}. Found: {{ item }} < 7

changed: [localhost] => (item=4)
changed: [localhost] => (item=5)
changed: [localhost] => (item=6)
skipping: [localhost] => (item=7)
skipping: [localhost] => (item=8)
skipping: [localhost] => (item=9)
skipping: [localhost] => (item=10)
skipping: [localhost] => (item=11)
skipping: [localhost] => (item=12)
skipping: [localhost] => (item=13)
skipping: [localhost] => (item=14)
skipping: [localhost] => (item=15)
skipping: [localhost] => (item=16)

PLAY RECAP *****************************************************************************************************************************************************
localhost                  : ok=2    changed=1    unreachable=0    failed=0

Answer 1

Ansible 运行循环并且：

• 对于项目

  4

  、

  5

  和

  6

  执行

  echo

  命令 - 显示

  changed

  状态，

• 对于剩余项目，它不会执行它 - 显示

  skipped

  状态，

你已经实现了你想要的。

---

您唯一可以改进的就是通过修复条件来消除警告：

- hosts: localhost
  tasks:
    - shell: echo {{ item }}
      register: result
      with_sequence: start=4 end=16
      when: "item|int < 7"

Answer 2

没有

break

、

until

、

when

或任何

IF

、

THEN

、

ELSE

构造的解决方案。

---
- hosts: localhost
  become: false
  gather_facts: false

  tasks:

  - name: "For {{ loop_range }} loop up to < {{ smaller_then }}"
    debug:
      msg: "{{ item }}"
    loop: "{{ loop_range[:idx | int] }}"
    loop_control:
      extended: true
      label: "{{ ansible_loop.index }}"
    vars:
      smaller_then: 7
      loop_range: "{{ range(4, 17, 1) }}"
      idx: "{{ loop_range | ansible.utils.index_of('eq', smaller_then) }}"

将导致

TASK [For [4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16] loop up to < 7] ******
ok: [localhost] => (item=1) =>
  msg: 4
ok: [localhost] => (item=2) =>
  msg: 5
ok: [localhost] => (item=3) =>
  msg: 6