Ansible variable in key/value key

Question

I'm passing env variables to a Docker container in an ansible playbook, how do I set an Ansible variable in the key in the key/value of an env?

So this:

- name: webproxy container
  docker_container:
    name: "webproxy"
    image: "webproxy"
    env:
      SERVICE_443_NAME: "webproxy"

becomes this:

- name: webproxy container
  docker_container:
    name: "webproxy"
    image: "webproxy"
    env:
      SERVICE_{{ port_number }}_NAME: "webproxy"

Answer 1

Use JSON notation to define a dictionary with environment variables:

- name: webproxy container
  docker_container:
    name: "webproxy"
    image: "webproxy"
    env: '{ "SERVICE_{{ port_number }}_NAME": "webproxy" }'