Question

我有以下Ansible任务：

tasks:
- name: ensure instances are running
    ec2:
      aws_access_key: "{{aws_access_key}}"
      aws_secret_key: "{{aws_secret_key}}"
      ...
      user_data: "{{ lookup('template', 'userdata.txt.j2') }}"
    register: ec2_result

- debug:
    msg: "{{ ec2_result }}"

- set_fact:
    win_instance_id: "{{ ec2_result | json_query('tagged_instances[*].id') }}"

输出：

TASK [debug] ***************
ok: [localhost] => {
    "msg": {
        "changed": false, 
        "failed": false, 
        "instance_ids": null, 
        "instances": [], 
        "tagged_instances": [
            {
                "ami_launch_index": "0", 
                "architecture": "x86_64", 
                "block_device_mapping": {
                    "/dev/sda1": {
                        "delete_on_termination": true, 
                        "status": "attached", 
                        "volume_id": "vol-01f217e489c681211"
                    }
                }, 
                "dns_name": "", 
                "ebs_optimized": false, 
                "groups": {
                    "sg-c63822ac": "WinRM RDP"
                }, 
                "hypervisor": "xen", 
                "id": "i-019c03c3e3929f76e", 
                "image_id": "ami-3204995d", 
                ... 
                "tags": {
                    "Name": "Student01 _ Jumphost"
                }, 
                "tenancy": "default", 
                "virtualization_type": "hvm"
            }
        ]
    }
}

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

TASK [debug] ******************
ok: [localhost] => {
    "msg": "The Windows Instance ID is: [u'i-019c03c3e3929f76e']"
}

如您所见，实例ID是正确的，但格式不正确。有没有办法将此输出转换为＆＃34;人类可读＆＃34;输出？或者有没有更好的方法来解析ec2任务输出中的实例ID？

谢谢！

Answer 1

它不是非人类可读格式，而是Python表示法中的列表对象，因为您查询列表。

如果你想要一个字符串，你应该通过first过滤器传递它。

win_instance_id: "{{ ec2_result | json_query('tagged_instances[*].id') | first }}"

您也可以直接访问该值而不json_query（[0]引用列表的第一个元素）：

win_instance_id: "{{ ec2_result.tagged_instances[0].id }}"

Ansible：从json输出中获取特定的属性值

1 个答案: