---
- hosts: all
  roles:
    - {role: base_setup,              tags: deploy_base       }---
- hosts: all
  roles:
    - { role: base_setup, tags: deploy_base }

- hosts: gateway
  roles:
    - { role: docker, tags: [docker, deploy_docker] }
    - { role: npm, tags: [npm, deploy_npm] }
    - { role: heimdall, tags: [heimdall, deploy_heimdall] }