Ansible 如何在一系列任务上循环? [英] How can Ansible loop over a sequence of tasks?

问题描述

Ansible 剧本如何循环 一系列任务?我希望实现一个轮询循环，该循环执行任务序列直到任务成功.当它失败时，异常处理程序将尝试修复该条件，然后循环将重复任务序列.

How can an Ansible playbook loop over a sequence of tasks? I wish to implement a polling loop that executes a task sequence until the task is successful. When it fails, an exception handler will attempt to fix the condition and then the loop will repeat the task sequence.

考虑以下假想示例:

- action:
    - block:
        - debug: msg='i execute normally'
        - command: /bin/foo
      rescue:
        - debug: msg='I caught an error'
        - command: /bin/fixfoo
      always:
        - debug: msg="this always executes"
  register: result
  until: result
  retries: 5
  delay: 10

推荐答案

从 Ansible 2.5 开始，推荐 loop 而不是 with_items.此外，由于您不想假设您的子任务没有任何循环，因此您可以使用比item"更具描述性的名称.这是一个在循环中使用循环的示例，稍微被截断但如果您定义适当的配置仍然可以工作:

As of Ansible 2.5, loop is recommended over with_items. Furthermore, since you don't want to assume your sub-task won't have any loops, you can use a more descriptive name than "item". Here's an example which uses a loop within a loop, slightly truncated but still working if you define the appropriate config:

# terminate-instances-main.yml:
---
- hosts: local
  connection: local
  vars:
    regions:
      - ap-southeast-1
      - us-west-1
  tasks:
    - include_tasks: "terminate-instance-tasks.yml"
      loop: "{{ regions }}"
      loop_control:
        loop_var: region

# terminate-instance-tasks.yml:
---
- name: Gather EC2 facts
  ec2_instance_facts:
    region: "{{ region }}"
    filters:
      "tag:temporary": "true"
    aws_access_key: "{{ aws_access_key }}"
    aws_secret_key: "{{ aws_secret_key }}"
  register: ec2

- name: Terminate Temp EC2 Instance(s)
  ec2:
    instance_ids: '{{ item.instance_id }}'
    state: absent
    region: "{{ region }}"
    aws_access_key: "{{ aws_access_key }}"
    aws_secret_key: "{{ aws_secret_key }}"
  loop: "{{ ec2.instances }}"

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