当条件为可执行任务时，将变量与中的项一起使用

Question

我正在使用以下行动手册来捕获vmware数据中心信息，该信息运行良好，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

以下是输出：

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条件中的输入。请建议我如何将变量值和when条件包含在一起。以下是跳过变量的输出

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

我建议您将寄存器值重命名为(与提示符var的名称相同(

- 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"对2个dict项进行迭代。由于您在item.name == "datacenter"上有一个条件，因此该条件仅适用于具有属性"name=&"的项；数据中心"；。这不是你想要实现的。

如何添加列表值"数据中心测试；以及"；opendc菜鸟；作为条件中的变量

这里有两个选项可以过滤数据中心列表，以保留两个选定的名称。

• "简单条件"：在CCD_ 7条件下使用简单的CCD_
• "列表条件"：直接过滤列表以迭代列表wanted_datacenters中定义的项目。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 }}"

Answer 3

• 使用json_query。当属性丢失时，此筛选器不会失败。例如

shell> cat pb.yml
- hosts: localhost
vars:
datacenter:
datacenter_info:
- config_status: gray
moid: datacenter-1247
name: Datacenter-Test
overall_status: gray
- config_status: gray
moid: datacenter-2
name: opendc-rookie
overall_status: gray
tasks:
- debug:
msg: "{{ _item }}"
vars:
_item: "{{ datacenter.datacenter_info|json_query(_query) }}"
_query: '[?name == `{{ dc_name|d("") }}`]'

给出

shell> ansible-playbook pb.yml -e dc_name=Datacenter-Test
PLAY [localhost] *****************************************************************************
TASK [debug] *********************************************************************************
ok: [localhost] => 
msg:
- config_status: gray
moid: datacenter-1247
name: Datacenter-Test
overall_status: gray

shell> ansible-playbook pb.yml
PLAY [localhost] *****************************************************************************
TASK [debug] *********************************************************************************
ok: [localhost] => 
msg: []

---

• 您可以迭代列表。例如

- debug:
msg: "{{ item.name }}"
loop: "{{ datacenter.datacenter_info|json_query(_query) }}"
vars:
_query: '[?name == `{{ dc_name|d("") }}`]'

---

• 如果要测试名称在列表中，请创建一个交集。例如

shell> cat pb.yml
- hosts: localhost
vars:
datacenter:
datacenter_info:
- config_status: gray
moid: datacenter-1247
name: Datacenter-Test
overall_status: gray
- config_status: gray
moid: datacenter-2
name: opendc-rookie
overall_status: gray
names: "{{ datacenter.datacenter_info|json_query('[].name') }}"
dc_names: ''
names_selected: "{{ names|intersect(dc_names.split(',')) }}"
tasks:
- debug:
msg: "{{ item.name }}"
loop: "{{ datacenter.datacenter_info }}"
when: item.name|d('') in names_selected

给出

shell> ansible-playbook pb.yml -e dc_names=Datacenter-Test,opendc-rookie
PLAY [localhost] *****************************************************************************
TASK [debug] *********************************************************************************
ok: [localhost] => (item={'config_status': 'gray', 'moid': 'datacenter-1247', 'name': 'Datacenter-Test', 'overall_status': 'gray'}) => 
msg: Datacenter-Test
ok: [localhost] => (item={'config_status': 'gray', 'moid': 'datacenter-2', 'name': 'opendc-rookie', 'overall_status': 'gray'}) => 
msg: opendc-rookie

shell> ansible-playbook pb.yml -e dc_names=opendc-rookie
PLAY [localhost] *****************************************************************************
TASK [debug] *********************************************************************************
skipping: [localhost] => (item={'config_status': 'gray', 'moid': 'datacenter-1247', 'name': 'Datacenter-Test', 'overall_status': 'gray'}) 
ok: [localhost] => (item={'config_status': 'gray', 'moid': 'datacenter-2', 'name': 'opendc-rookie', 'overall_status': 'gray'}) => 
msg: opendc-rookie

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