如何根据 set_facts 将多个 ansible 条件合并为一个

How to Club multiple ansible condition into one based on the set_facts

在研究 中的一个 ansible 食谱时,我发现它很有趣,同时使用 set_fact 进行不同的条件检查。然而,我根据我的方法回答了 post 但是,我仍然看到可以改进俱乐部的多个条件来完成类似的任务,比如确定 location resource groupvnet.

下面是 playbook 和变量文件 azure_vars.yml

播放

---
- name: create azure vm
  hosts: localhost
  connection: local
  tasks:
   -  include_vars: azure_vars.yml

   - set_fact:
      host: "{{ azure_vm_name.split('.') }}"

   - set_fact:
       domain: "{{ host.1 }}.{{ host.2 }}"

   - name: Domain
     debug:
      msg: "{{ domain }}"

   - set_fact:
      location: "{{ azure_location[0] }}"
     when: 'domain == azure_domain[0]'

   - set_fact:
      location: "{{ azure_location[1] }}"
     when: 'domain == azure_domain[1]'

   - set_fact:
      location: "{{ azure_location[2] }}"
     when: 'domain == azure_domain[2]'

   - name: Location
     debug:
      msg: "{{ location }}"

   - set_fact:
      res_group: "{{ azure_res_group[0] }}"
     when: 'domain == azure_domain[0]'

   - set_fact:
      res_group: "{{ azure_res_group[1] }}"
     when: 'domain == azure_domain[1]'

   - set_fact:
      res_group: "{{ azure_res_group[2] }}"
     when: 'domain == azure_domain[2]'

   - name: Resource Group
     debug:
      msg: "{{ res_group }}"

   - set_fact:
      vnet: "{{ azure_nprod_vnet }}"
     when: 'domain == azure_domain[0]'

   - set_fact:
      vnet: "{{ azure_prod03_vnet }}"
     when: 'domain == azure_domain[2]'

   - set_fact:
      vnet: "{{ azure_prod02_vnet }}"
     when: 'domain == azure_domain[1]'

   - name: Vnet
     debug:
      msg: "{{ vnet }}"

可变文件

此文件包含所有变量,这些变量将成为 playbook 的一部分并在任务部分下作为 include_vars 导入。

$ cat azure_vars.yml
---
azure_nprod_vnet: "/subscriptions/XXXXXXXX-XXX-XXXX-XXXX-XXXXXXXXXXXX/resourceGroups/rg001/providers/Microsoft.Network/virtualNetworks/vnet"
azure_prod02_vnet: "/subscriptions/XXXXXXXX-XXX-XXXX-XXXX-XXXXXXXXXXXX/resourceGroups/rg003/providers/Microsoft.Network/virtualNetworks/vnet"
azure_prod03_vnet: "/subscriptions/XXXXXXXX-XXX-XXXX-XXXX-XXXXXXXXXXXX/resourceGroups/rg002/providers/Microsoft.Network/virtualNetworks/vnet"

    
# Azure domain
azure_domains:
  - us-sea01
  - us-azrc2
  - eu-azrc1


# Resource group
azure_res_group:
  - rg001
  - rg002
  - rg003

# Azure locations
azure_location:
  - westus2
  - southcentralus
  - westeurope
...

预计俱乐部三成以下条件:

   - set_fact:
      location: "{{ azure_location[0] }}"
     when: 'domain == azure_domain[0]'

   - set_fact:
      location: "{{ azure_location[1] }}"
     when: 'domain == azure_domain[1]'

   - set_fact:
      location: "{{ azure_location[2] }}"
     when: 'domain == azure_domain[2]'

可能是这样的:

   - set_fact:
      location:
        - azure_location[0]
        - azure_location[1]
        - azure_location[2]
     when:
       - 'domain == azure_domain[0]
       - 'domain == azure_domain[1]
       - 'domain == azure_domain[2]

您可以使用 loop and zip filter, or in the older fashion way, with a with_together 解决此问题 — 如果您想 future-proof 您的剧本,不再推荐。

鉴于剧本:

- hosts: all
  vars:
    azure_vm_name: foo.bar.us-sea01.whatever.example.org

  tasks:
    - include_vars: azure_vars.yml

    - set_fact:
        host: "{{ azure_vm_name.split('.') }}"

    - set_fact:
        domain: "{{ host.2 }}"

    - name: Domain
      debug:
        msg: "{{ domain }}"

    - set_fact:
        location: "{{ item.1 }}"
      loop: "{{ azure_domains | zip(azure_location) | list }}"
      when: 'domain == item.0'

    - name: Location
      debug:
       msg: "{{ location }}"

和变量文件azure_vars.yml:

azure_domains:
  - us-sea01
  - us-azrc2
  - eu-azrc1

azure_location:
  - westus2
  - southcentralus
  - westeurope

这产生了回顾:

PLAY [all] *******************************************************************************************************

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

TASK [include_vars] **********************************************************************************************
ok: [localhost]

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

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

TASK [Domain] ****************************************************************************************************
ok: [localhost] => {
    "msg": "us-sea01"
}

TASK [set_fact] **************************************************************************************************
ok: [localhost] => (item=['us-sea01', 'westus2'])
skipping: [localhost] => (item=['us-azrc2', 'southcentralus']) 
skipping: [localhost] => (item=['eu-azrc1', 'westeurope']) 

TASK [Location] **************************************************************************************************
ok: [localhost] => {
    "msg": "westus2"
}

PLAY RECAP *******************************************************************************************************
localhost                  : ok=7    changed=0    unreachable=0    failed=0    skipped=0    rescued=0    ignored=0   

这表示还有另一种可能性,使用 Python 的 Ansible 功能。您可以使用列表的 index() 方法将 azure_location 的元素定位为与 azure_domains.
中的 domain 处于相同位置的元素 例如如果 domain 位于 azure_domains 的位置 2,您将在 azure_location.

中获得位置 2 的元素

鉴于剧本:

- hosts: all
  vars:
    azure_vm_name: foo.bar.us-sea01.whatever.example.org

  tasks:
    - include_vars: azure_vars.yml

    - set_fact:
        host: "{{ azure_vm_name.split('.') }}"

    - set_fact:
        domain: "{{ host.2 }}"

    - name: Domain
      debug:
        msg: "{{ domain }}"

    - set_fact:
        location: "{{ azure_location[azure_domains.index(domain)] }}"

    - name: Location
      debug:
       msg: "{{ location }}"

和相同的变量文件azure_vars.yml,这产生了回顾:

PLAY [all] ******************************************************************************************************************

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

TASK [include_vars] *********************************************************************************************************
ok: [localhost]

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

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

TASK [Domain] ***************************************************************************************************************
ok: [localhost] => {
    "msg": "us-sea01"
}

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

TASK [Location] *************************************************************************************************************
ok: [localhost] => {
    "msg": "westus2"
}

PLAY RECAP ******************************************************************************************************************
localhost                  : ok=7    changed=0    unreachable=0    failed=0    skipped=0    rescued=0    ignored=0   

其中没有使用循环,因此更容易回顾。