Question

我正在尝试使用基于include_vars条件的when，如下所示：

- include_vars: clouderamanager.yml
  when: '{{ inventory_hostname }}' in groups['hadoop-clouderamanager']

- include_vars: hadoop-namenode.yml
  when: '{{ inventory_hostname }}' in groups['hadoop-namenode']

- include_vars: resourcemanager.yml
  when: '{{ inventory_hostname }}' in groups['hadoop-resourcemanager']

- include_vars: spark-history-server.yml
  when: '{{ inventory_hostname }}' in groups['spark-history-server']

我正在ERROR! Syntax Error while loading YAML.

The error appears to have been in '~/ansible/roles/hadoop-master/tasks/main.yml': line 4, column 36, but may be elsewhere in the file depending on the exact syntax problem.

The offending line appears to be:

- include_vars: clouderamanager.yml
  when: '{{ inventory_hostname }}' in groups['hadoop-clouderamanager']
                                   ^ here

Answer 1

当条件有效时改变

when: inventory_hostname in groups['hadoop-clouderamanager']

Answer 2

如果一个值开始引用，则必须引用整个值直到结束或YAML解析器发生癫痫发作。

这意味着你必须定义这样的条件：

when: "'{{ inventory_hostname }}' in groups['hadoop-clouderamanager']"

不幸的是，Ansible 2中的错误消息并不像Ansible 1那样清晰，它实际上已经指出了这一点。

只是为了确保...你知道 group_vars ？您可以在group_vars/hadoop-clouderamanager中定义变量，而不需要自己包含变量，因为Ansible会自动加载所有匹配组的所有变量。

如何做Ansible条件include_vars？

2 个答案: