Install docker and docker-compose using ansible https://srijan.ch/install-docker-and-docker-compose-using-ansible

docker_setup.yml

---
- name: Install packages using apt
  apt:
    name: 
        - apt-transport-https
        - ca-certificates
        - curl
        - gnupg2
        - software-properties-common
    state: present
    cache_valid_time: 86400

- name: Add Docker GPG apt Key
  apt_key:
    url: "{{ docker_apt_gpg_key }}"
    state: present

- name: Add Docker Repository
  apt_repository:
    repo: "{{ docker_apt_repository }}"
    state: present
    update_cache: true

- name: Install docker-ce
  apt:
    name: docker-ce
    state: present
    cache_valid_time: 86400

- name: Install docker compose
  apt:
    name: docker-compose-plugin
    state: present
    cache_valid_time: 86400

- name: Run and enable docker
  service:
    name: docker
    state: started
    enabled: true

- name: Install docker-compose v1
  when:
    - docker_compose_install_v1 is defined
    - docker_compose_install_v1
  block:
    - name: Check current docker-compose version.
      command: docker-compose --version
      register: docker_compose_vsn
      changed_when: false
      failed_when: false
      check_mode: no
    - name: Set docker compose current version
      set_fact:
        docker_compose_current_version: "{{ docker_compose_vsn.stdout | regex_search('(\\d+(\\.\\d+)+)') }}"
      when:
        - docker_compose_vsn.stdout is defined
    - name: Install or upgrade docker-compose
      get_url: 
        url : "https://github.com/docker/compose/releases/download/{{ docker_compose_version_v1 }}/docker-compose-Linux-x86_64"
        dest: /usr/local/bin/docker-compose
        mode: 'a+x'
        force: yes
      when: >
        docker_compose_current_version == ""
        or docker_compose_current_version is version(docker_compose_version_v1, '<')

vars.yml

---
docker_apt_release_channel: stable
docker_apt_arch: amd64
docker_apt_repository: "deb [arch={{ docker_apt_arch }}] https://download.docker.com/linux/{{ ansible_distribution | lower }} {{ ansible_distribution_release }} {{ docker_apt_release_channel }}"
docker_apt_gpg_key: https://download.docker.com/linux/{{ ansible_distribution | lower }}/gpg
docker_compose_install_v1: true
docker_compose_version_v1: "1.29.2"

There are several separate issues with this gist. Failing in clean debian 10.4. Issues found:

1. -name: Install packages using apt
   fails because of update_cache: no

2. "-name: setup-servers : Install or upgrade docker-compose"

fails because:

    docker_compose_current_version is not defined

should be:

- docker_compose_current_version == ""

3. • name: Run and enable docker

fails with:

No module named 'requests'
fatal: [vm01]: FAILED! => {"changed": false, "msg": "Failed to import the required Python library (Docker SDK for Python: docker>=5.0.0 (Python >= 3.6) or docker<5.0.0 (Python 2.7))

because python3-requests also needs to be installed

4. When using docker-compose:

 ModuleNotFoundError: No module named 'docker' 

@chamalis - thanks. I plan to update the gist and linked blog post with a more complete solution. These days docker compose v2 is available via apt as well, so no need to download from github releases anymore if you don't need v1.

@chamalis - Updated, thanks.