是否可以根据映射值为 Ansible 角色指定主机?

是否可以根据映射值为 Ansible 角色指定主机?

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,默认值是的变量single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'

答案1

还有更多选择:

  1. 将逻辑代入表达式主持人:
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. 创造孩子们(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

如果您无法更改库存文件,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,请创建一个角色

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

并在剧本中将其与您喜欢的任何标签一起使用

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

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