在无法执行的任务中，在条件中使用变量和项

Question

我使用下面的剧本来捕获vmware数据中心信息，它运行良好，没有任何问题：

---
- hosts: localhost
  vars_files: 1credentials.yml
  tasks:
    - name: Gather information about all datacenters
      community.vmware.vmware_datacenter_info:
        hostname: '{{ vcenter_hostname }}'
        username: '{{ vcenter_username }}'
        password: '{{ vcenter_password }}'
        validate_certs: no
      delegate_to: localhost
      register: datacenter

    - debug:
        msg: "{{ item.name }}"
      loop: "{{ datacenter.datacenter_info }}"
      when:
        - item.name is defined
        - item.name == datacenter

以下是产出：

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

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

TASK [Gather information about all datacenters] ************************************************************************************************************************
ok: [localhost]

TASK [debug] ***********************************************************************************************************************************************************
skipping: [localhost] => (item={'name': 'Datacenter-Test', 'moid': 'datacenter-1247', 'config_status': 'gray', 'overall_status': 'gray'})
ok: [localhost] => (item={'name': 'opendc-rookie', 'moid': 'datacenter-2', 'config_status': 'gray', 'overall_status': 'gray'}) => {
    "msg": "opendc-rookie"
}

PLAY RECAP *************************************************************************************************************************************************************
localhost                  : ok=3    changed=0    unreachable=0    failed=0    skipped=0    rescued=0    ignored=0

但是，当我尝试使用var_prompt并请求变量数据中心的用户输入时，如下所示：

---
- hosts: localhost
  vars_files: 1credentials.yml
  vars_prompt:
    - name: datacenter
      prompt: mention the datacenter name
      private: no
  tasks:
    - name: Gather information about all datacenters
      community.vmware.vmware_datacenter_info:
        hostname: '{{ vcenter_hostname }}'
        username: '{{ vcenter_username }}'
        password: '{{ vcenter_password }}'
        validate_certs: no
      delegate_to: localhost
      register: datacenter

    - debug:
        msg: "{{ item.name }}"
      loop: "{{ datacenter.datacenter_info }}"
      when:
        - item.name is defined
        - item.name == "datacenter"

它跳过调试任务而不替换数据中心变量的值，该值是用户在when条件下的输入。请建议我如何将变量值与具有项的条件合并。下面是跳过变量的输出

mention the datacenter name: opendc-rookie

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

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

TASK [Gather information about all datacenters] ************************************************************************************************************************
ok: [localhost]

TASK [debug] ***********************************************************************************************************************************************************
skipping: [localhost] => (item={'name': 'Datacenter-Test', 'moid': 'datacenter-1247', 'config_status': 'gray', 'overall_status': 'gray'})
skipping: [localhost] => (item={'name': 'opendc-rookie', 'moid': 'datacenter-2', 'config_status': 'gray', 'overall_status': 'gray'})
skipping: [localhost]

PLAY RECAP *************************************************************************************************************************************************************
localhost                  : ok=2    changed=0    unreachable=0    failed=0    skipped=1    rescued=0    ignored=0

Answer 1

我建议您重命名您的注册值(与提示var相同的名称)

- hosts: localhost
  vars_files: 1credentials.yml
  vars_prompt:
    - name: datacenter
      prompt: mention the datacenter name
      private: no
  tasks:
    - name: Gather information about all datacenters
      community.vmware.vmware_datacenter_info:
        hostname: '{{ vcenter_hostname }}'
        username: '{{ vcenter_username }}'
        password: '{{ vcenter_password }}'
        validate_certs: no
      delegate_to: localhost
      register: datacenterX

    - debug:
        msg: "{{ item.name }}"
      loop: "{{ datacenterX.datacenter_info }}"
      when:
        - item.name is defined
        - item.name == datacenter

Answer 2

在跟踪中，我们可以看到debug任务正在使用键(或属性) name = "Datacenter-Test"和name = "opendc-rookie"迭代超过2个dict项。因为您在item.name == "datacenter"上有一个条件，所以这个条件只适用于具有属性‘`name = "datacenter“的项。这不是你想要达到的目标。

如何将列表值“Datacenter”和"opendc-rookie“添加为

条件中的变量

以下是两个筛选数据中心列表的选项，以保留所选的两个名称。

• “简单条件”：在when条件中使用简单的or：直接过滤列表以迭代列表wanted_datacenters中定义的项。此选项适用于输入ansible-playbook loop.yml --extra-vars='{"wanted_datacenters": ["opendc-rookie", "Datacenter-Test"]}'

。

- hosts: localhost
  vars:
    datacenter:
      - name: opendc-rookie
      - name: Datacenter-Test
    wanted_datacenters:
      - opendc-rookie
      - Datacenter-Test
  tasks:
    - name: "simple condition"
      debug:
        msg: "{{ item.name }}"
      loop: "{{ datacenter }}"
      when: item.name == "Datacenter-Test" or item.name == "opendc-rookie"
    - name: "list condition"
      debug:
        msg: "{{ item.name }}"
      loop: "{{ datacenter|selectattr('name', 'in', wanted_datacenters)|list }}"