使用check / dry-run开发AWS基础架构预配ansible手册

Question

我正在尝试使用ansible设置AWS基础设施。我的简化剧本vpc.yml如下：

- hosts: localhost
  connection: local
  gather_facts: false
  vars:
    vpc_name:           "Test VPC"
    vpc_cidr_block:     "10.0.0.0/16"
    aws_region:         "ap-east-1"
    subnets:
      test_net_1a:
        az:             "ap-east-1a"
        cidr:           "10.0.1.0/24"
      test_net_1a:
        az:             "ap-east-1b"
        cidr:           "10.0.2.0/24"

  tasks:

    - name:               Create VPC
      ec2_vpc_net:
        name:             "{{ vpc_name }}"
        cidr_block:       "{{ vpc_cidr_block }}"
        region:           "{{ aws_region }}"
        state:            "present"
      register: my_vpc

    # Save VPC id in a new variable.
    - name:               Set VPC ID in variable
      set_fact:
        vpc_id:           "{{ my_vpc.vpc.id }}"

    - name:               Create Subnets
      ec2_vpc_subnet:
        state:            "present"
        vpc_id:           "{{ vpc_id }}"
        cidr:             "{{ item.value.cidr }}"
        az:               "{{ item.value.az }}"
        region:           "{{ aws_region }}"
        resource_tags:
          Name:           "{{ item.key }}"
      loop: "{{ subnets | dict2items }}"

现在，我尝试使用ansible-playbook vpc.yml --check测试我的剧本。但是，该剧本会失败，因为使用--check的my_vpc将返回：

"changed": true,
"failed": false

显然--check不能用于使用ansible预览AWS设置更改，那么如何在开发过程中测试我的剧本而不进行任何实际的基础架构更改？