community.general/examples/playbooks/environment.yml

---

# it is often useful to be able to set the environment for one command and have that environment be totally
# different for another.  An example is you might use a HTTP proxy for some packages but not for others.
#
# in Ansible 1.1 and later, you can pass the environment to any module using either a dictionary variable
# or a dictionary itself.


- hosts: all
  user: root

  # here we make a variable named "env" that is a dictionary
  vars:
    env: 
       HI: test2
       http_proxy: http://proxy.example.com:8080

  tasks:

    # here we just define the dictionary directly and use it
    # (here $HI is the shell variable as nothing in Ansible will replace it)

    - shell: echo $HI
      environment:
         HI: test1

    # here we are using the $env variable above
    
    - shell: echo $HI
      environment: env