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Accepted
Sollosa
Asked: 2022-12-10 06:16:53 +0800 CST

是否可以根据映射值为 ansible 角色指定主机？

  • 772

我有主机，我可以在其中在单节点架构或分布式架构上设置应用程序。所以我有一个库存。

[STG]
node1

[LIVE]
app_node
db_node
gateway_node

因此具有默认值的变量是single但可以在 CLI 上更改为distributed

我有一个角色定义

- hosts:
  gather_facts: no
  roles:
      - {role: setup, tags: ['setup', 'orchestra']}

所以我希望主机线根据地图值是动态的

- hosts: 'if single then host == STG else LIVE'
variable

1 个回答

  1. Best Answer

    还有更多选择：

    1. 把逻辑放到hosts的表达式中：
    shell> cat pb.yml
- hosts: "{{ (map_value == 'single')|ternary('STG', 'LIVE') }}"
  tasks:
    - debug:
        var: ansible_play_hosts
      run_once: true

    给你想要的

    shell> ansible-playbook pb.yml -e map_value=single

PLAY [single] ********************************************************************************

TASK [debug] *********************************************************************************
ok: [node1] => 
  ansible_play_hosts:
  - node1

PLAY RECAP ***********************************************************************************
node1: ok=1    changed=0    unreachable=0    failed=0    skipped=0    rescued=0    ignored=0   

    shell> ansible-playbook pb.yml -e map_value=distributed

PLAY [distributed] ***************************************************************************

TASK [debug] *********************************************************************************
ok: [app_node] => 
  ansible_play_hosts:
  - app_node
  - db_node
  - gateway_node

PLAY RECAP ***********************************************************************************
app_node: ok=1    changed=0    unreachable=0    failed=0    skipped=0    rescued=0    ignored=0
    1. 创建孩子（组别名）
    shell> cat hosts 
[STG]
node1

[single:children]
STG

[LIVE]
app_node
db_node
gateway_node

[distributed:children]
LIVE

    然后，剧本给出了相同的结果

    shell> cat pb.yml
- hosts: "{{ map_value }}"
  tasks:
    - debug:
        var: ansible_play_hosts
      run_once: true

    如果您无法更改清单文件，请将别名放入单独的文件中。例如，

    shell> tree inventory/
inventory/
├── 01-hosts
└── 02-aliases

    shell> cat inventory/01-hosts 
[STG]
node1

[LIVE]
app_node
db_node
gateway_node

    shell> cat inventory/02-aliases 
[single:children]
STG

[distributed:children]
LIVE

    然后，剧本给出了相同的结果

    shell> ansible-playbook -i inventory pb.yml -e map_value=single
...
shell> ansible-playbook -i inventory pb.yml -e map_value=distributed
...
    1. 使用构建的库存插件。看
    shell> ansible-doc -t inventory constructed

    例如，库存

    shell> tree inventory
inventory
├── 01-hosts
└── 02-constructed.yml

    shell> cat inventory/01-hosts 
[STG]
node1

[STG:vars]
map_group_value=single

[LIVE]
app_node
db_node
gateway_node

[LIVE:vars]
map_group_value=distributed

    shell> cat inventory/02-constructed.yml 
plugin: constructed
use_extra_vars: true
compose:
  map_group: map_value
groups:
  map_group: map_group == map_group_value

    然后，剧本

    - hosts: map_group
  tasks:
    - debug:
        var: ansible_play_hosts
      run_once: true

    给出相同的结果

    shell> ansible-playbook -i inventory pb.yml -e map_value=single
...
shell> ansible-playbook -i inventory pb.yml -e map_value=distributed
...

    如果您坚持使用角色测试用例，请创建一个

    shell> cat roles/setup/tasks/main.yml 
- debug:
    var: ansible_play_hosts
  run_once: true

    并在剧本中使用您喜欢的任何标签

    shell> cat pb.yml
- hosts: map_group
  roles:
    - role: setup
    • 2

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