python之ansible 条件模板

我想在 ansibles jinja 模板中有一个简单的 if else 条件。对于普通的 python

cluster_name+'A' if isCondition is True else cluster_name +'B' 

如果定义了以下变量，效果会更好:

isSingleNode = True 
cluster_name = 'example' 

在 ansible 中我看到以下错误:

fatal: [localhost]: FAILED! => {"changed": false, "failed": true, "msg": "AnsibleError: template error while templating string: no test named 'True'. String: {\n\n   \"key\" : \"{{ groups[cluster_name+'_mn01' if isSingleNode is True else cluster_name + '_mn02'] }}\"\n}\n"} 

这是一个最小的例子:

文件_1:变量

--- 
isCondition: True 

file_2: 剧本.yml

--- 
- hosts: all 
  tasks: 
    - include_vars: variables 
    - debug: msg=" condition is {{ isCondition }} with cluster_name {{ cluster_name }}" 
 
    - name: copy file 
      template: src="bare_cluster.bp.j2" dest={{ cluster_name }}_blueprint.json backup=yes 

file_4:库存

[examplecluster:children] 
examplecluster_mn01 
 
[mn01:children] 
examplecluster_mn01 
 
[examplecluster_mn01] 
localhost ansible_connection=local 

file_5: bare_cluster.bp.j2

{ 
 
   "key" : "{{ groups[cluster_name+'_mn01' if isSingleNode is True else cluster_name + '_mn02'] }}" 
} 

执行最小示例的命令是 ansible-playbook -i inventory playbook.yml -e 'cluster_name=examplecluster'

请您参考如下方法:

你尝试了吗？

{% if isCondition %} {{ cluster_name }} A {% else %} {{ cluster_name }} B {% endif %}