有什么办法可以改变group_vars / all下定义的变量的值

Question

我在ansible的group_vars/all文件中定义了一个变量。

overlay:True

我需要检查playbook中的内核版本，如果内核版本小于4，则将上面的varibale设置为false。可以在ansible中完成。 如果是，我想知道步骤/ ansible模块。

Answer 1

According to http://docs.ansible.com/ansible/playbooks_variables.html#variable-precedence-where-should-i-put-a-variable

In 2.x, we have made the order of precedence more specific (with the last listed variables winning prioritization):

• role defaults [1]
• inventory file or script group vars [2]
• inventory group_vars/all
• playbook group_vars/all
• inventory group_vars/*
• playbook group_vars/*
• inventory file or script host vars [2]
• inventory host_vars/*
• playbook host_vars/*
• host facts
• play vars
• play vars_prompt
• play vars_files
• role vars (defined in role/vars/main.yml)
• block vars (only for tasks in block)
• task vars (only for the task)
• role (and include_role) params
• include params
• include_vars
• set_facts / registered vars
• extra vars (always win precedence)

set_fact has the second higher precedence. So vars set by set_fact should be able to override group vars.