Question

- roles
  - consul
    - vars/main.yml

在main.yml我尝试：

consul_is_server: {{ true if consul_server is defined else false }}

和剧本：

- hosts: consul-server
  roles:
    - consul
  vars:
    consul_server: true

收到错误：

consul_is_server: {{ "true" if consul_server is defined else "false" }}
                            ^
We could be wrong, but this one looks like it might be an issue with
missing quotes.  Always quote template expression brackets when they
start a value. For instance:

    with_items:
      - {{ foo }}

Should be written as:

    with_items:
      - "{{ foo }}"

如何在任务变量中使用条件？

Answer 1

Vars文件不包含条件，它们应该只包含变量。条件在剧本的任务部分使用。

final Handler handler = new Handler(); // Here is main / UI thread.
new Thread(new Runnable(){
    @Override
    public void run(){
        /* Background tasks go here */

        /* Once you're done ...*/
        handler.post(new Runable(){
            @Override
            public void run(){
                /* Post-execution code go here */
            }
        })
    }
}).start();

然后条件执行可能如下所示：

vars:
  consul_server: true

Answer 2

现在已经成功了：

consul_is_server:  >
    {{ true  if consul_server is defined and consul_server==true else false }}

但在这种情况下consul_is_server是字符串：“False”或“True”。

因此，当在模板中使用此var时，我需要使用强制转换为bool：

"server": {{ "true" if consul_is_server |bool else "false" }}

在Ansible任务变量中使用条件

2 个答案: