ansible/roles/rancher/tasks/rancher_agent.yml

---
- name: Add Rancher Agent
  docker_container:
    name: rancher_agent
    image: "{{ server_hostvars.rancher_agent_image }}"
    command: "{{ server_hostvars.rancher_agent_reg_url }}"
    volumes:
      - "/var/run/docker.sock:/var/run/docker.sock"
      - "/var/lib/rancher:/var/lib/rancher"
    privileged: true
  vars:
    server_hostvars: "{{ hostvars[groups.infrastructure.0] }}"