In your efforts to run hosts for Docker containers, you will inevitably come across the need to install Docker automatically via configuration management.
Here is a quick Ansible playbook to install Docker on Ubuntu 18.04 Bionic, and optionally, enable Docker to use insecure registries in a defined IP address or range:
- hosts: all become: true tasks: - name: ensure repository key is installed apt_key: url: https://download.docker.com/linux/ubuntu/gpg state: present - name: ensure docker registry is available apt_repository: repo='deb https://download.docker.com/linux/ubuntu bionic stable' state=present - name: ensure docker and dependencies are installed apt: name=docker-ce update_cache=yes # Uncomment the following to enable insecure registries with Docker #- name: ensure docker can use insecure registries in 10.11.0.0/16 # lineinfile: "dest=/etc/default/docker regexp=^DOCKER_OPTS line=DOCKER_OPTS='--insecure-registry 10.11.0.0/16'" - service: name=docker state=restarted
Please note, though, that using insecure registries is made difficult on purpose. You should opt for using a secured registry whenever possible.
Releaseworks Academy has a free online training course on Docker & Jenkins best practices: https://www.releaseworksacademy.com/courses/best-practices-docker-jenkins