Ansible dynamic inventory add_host example

playbook.yaml

# ansible-playbook -e new_machine_name=new_machine playbook.yaml
---
- name: "Provision machine"
  hosts: "localhost"
  tasks:
  - name: "Create machine ..."
    docker_container:
      name: "{{ new_machine_name }}"
      hostname: "{{ new_machine_name }}"
      command: ["sleep", "infinity"]
      image: "python:3-slim"
    register: "docker_output"
  - name: "output"
    debug:
      msg: "{{ docker_output }}"  
  - name: "Add to inventory ..."
    add_host:
      name: "{{ new_machine_name }}"
      ansible_host: "{{ new_machine_name }}"
      ansible_connection: "docker"

- name: "Do some stuff in the new created machine"
  hosts: "{{ new_machine_name }}"
  tasks:
  - name: "get hostname"
    ansible.builtin.command: "hostname"
    register: "hostname"
  - name: "show hostname"
    debug:
      msg: "{{ hostname.stdout }}"
- name: "Clean everything"
  hosts: "localhost"
  tasks:
  - name: "Stop container"
    docker_container:
      name: "{{ new_machine_name }}"
      state: "stopped"
  - name: "Remove container"
    docker_container:
      name: "{{ new_machine_name }}"
      state: "absent"
...