Ubuntu 20.04 based Docker in Docker Image

The main intent for this project is to use this container with Molecule to test Ansible roles that deploy Docker containers.

Python 3.x and sudo as a become method are preinstalled.

Available tags

• latest: Latest stable version of Docker
• 20.10.6: Docker Version 20.10.6
• 20.10.5: Docker Version 20.10.5
• 19.03.15: Docker Version 19.03.15

How to use with molecule

To use the Docker image as a platform in Molecule, add the following to the molecule/default/molecule.yml file.

platforms:
  - name: instance
    image: "mreimbold/ubuntu2004-dind:latest"
    command: ""
    privileged: true
    pre_build_image: true

To test your role in a more realistic way, a non-root user named ansible is available in the Docker image. To use this user, add the following to your molecule/default/converge.yml file. This means that no longer all tasks are executed with root permissions and the become keyword must be set explicitly.

---
- name: Converge
  ...

  vars:
    ansible_user: ansible

How to use locally

1. Install Docker.
2. Pull this image from Docker Hub: docker pull mreimbold/ubuntu2004-dind:latest.
3. Run a container from the image: docker run --detach --privileged --name docker mreimbold/ubuntu2004-dind:latest
4. Use Docker inside the container: docker exec --tty docker docker --help