在 Ansible 中，如何使用数组遍历 stdout？

Question

Ansible v2.6.3

我有一个简单的任务，它在我的 jenkins ECS 集群中获取 AWS ARN

  tasks:
  - command: aws ecs list-container-instances --cluster jenkins
    register: jenkins_ecs_containers

  - debug: var=jenkins_ecs_containers.stdout

并有以下输出

TASK [debug] *******************************************************************
ok: [localhost] => {
    "jenkins_ecs_containers.stdout": {
        "containerInstanceArns": [
           "arn:aws:ecs:us-east-1:arn0", 
           "arn:aws:ecs:us-east-1:arn1"
        ]
    }
}

如何迭代 ARN？我试过了

- debug: var=item
  with_items: jenkins_ecs_containers.stdout.containerInstanceArns

给予

TASK [debug] *******************************************************************
ok: [localhost] => (item=jenkins_ecs_containers.stdout.containerInstanceArns) => {
    "item": "jenkins_ecs_containers.stdout.containerInstanceArns"
}

或

- debug: var=item
  with_items: "{{ jenkins_ecs_containers.stdout.containerInstanceArns }}"

给予

TASK [debug] *******************************************************************
fatal: [localhost]: FAILED! => {"msg": "'ansible.utils.unsafe_proxy.AnsibleUnsafeText object' has no attribute 'containerInstanceArns'"}
    to retry, use: --limit @/Users/cfouts/git-repos/ansible/playbooks/loop.retry

谢谢！

Answer 1

我用你的输出创建了一个文件。所以我用了set_fact。否则，它只是一个字符串，而不是一个 JSON 对象：

  tasks:

  - command: cat files/stdout.txt
    register: result

  - debug: var=result.stdout

  - set_fact:
      jenkins_ecs_containers: "{{ result.stdout }}"

  - debug:
      msg: "{{ item }}"
    with_items: "{{ jenkins_ecs_containers.containerInstanceArns }}"

这给了我以下输出：

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

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

TASK [command] *****************************************************************
changed: [localhost]

TASK [debug] *******************************************************************
ok: [localhost] => {
    "result.stdout": {
        "containerInstanceArns": [
            "arn:aws:ecs:us-east-1:arn0", 
            "arn:aws:ecs:us-east-1:arn1"
        ]
    }
}

TASK [set_fact] ****************************************************************
ok: [localhost]

TASK [debug] *******************************************************************
ok: [localhost] => (item=None) => {
    "msg": "arn:aws:ecs:us-east-1:arn0"
}
ok: [localhost] => (item=None) => {
    "msg": "arn:aws:ecs:us-east-1:arn1"
}

PLAY RECAP *********************************************************************
localhost                  : ok=5    changed=1    unreachable=0    failed=0

Answer 2

你可以像这样迭代：

- debug:
    msg: "{{ item[1] }}"
  with_subelements:
    - "{{ jenkins_ecs_containers }}"
    - containerInstanceArns

通过这个link，它会更清楚。

在 Ansible 中，如何使用数组遍历 stdout？

In Ansible, how can I iterate over stdout with an array?

ansible

ansible-2.x