问题
I read key1=value1 key2=value2 style dictionaries all the time in ansible playbooks that are supposed to be written in YAML. On the other hand I didn't find any documentation for this format and there seem to be cases where it doesn't work for me. What is the exact specification and where can I find it?
回答1:
In Ansible key=value is not used for dicts in general.
It is an alternative syntax to pass parameters to actions/modules, like:
- name: restart apache
service: name=apache state=restarted
Here you pass name and state parameters to service module.
From YAML perspective name=apache state=restarted is a string. There's some magic done under the hood by Ansible to split it. But it become unreliable and cumbersome with complex arguments, so I always use native YAML syntax:
- name: restart apache
service:
name: apache
state: restarted
And this key=value works only for modules/actions parameters, you can't define dictionaries like this:
vars:
# this will give you a string, not dict
mydict: key1=value1 key2=value
来源：https://stackoverflow.com/questions/42907723/yaml-when-an-equals-sign-can-be-used-for-dictionaries