在 Ansible 中，如何使用数组迭代标准输出?

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

并具有以下输出

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

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

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 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

您可以像这样迭代：

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

通过此链接，它会使其更清晰。