Select instance from dynamic inventory based on tag

ansible-playbook example.yml -e targetpractice=true

- name: targetpractice
  hosts: tag_env_prod
  gather_facts: false
  roles:
    - targetpractice

Runtime variables targetpractice=true targetpractice=false

Find started/stopped instances with tag_env_prod.

• If runtime variable targetpractice=true
  • instances state started
    • wait for instances to be reachable
  • register instances to target group
• If runtime variable targetpractice=false
  • unregister instances from to target group
  • instances state stopped

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The Ansible ELB and EC2 start permission are granted to the ansible controller. I'll still need to be able to execute shell tasks on the remote instances, like normal. I want to pick hosts based on tags.