As with all of the roles we have created so far, we are going to use the ansible-galaxy command to generate the structure for our role:
$ ansible-galaxy init roles/docker
For our Docker installation, we will be using the yum repository provided by Docker itself; this means that before we install, Docker needs to enable the repository. Once enabled, we will be able to install the latest stable release. Let's make a start by populating some defaults in roles/docker/defaults/main.yml:
docker: gpg_key: "https://download.docker.com/linux/centos/gpg" repo_url: "https://download.docker.com/linux/centos/docker-ce.repo" repo_path: "/etc/yum.repos.d/docker-ce.repo" packages: - "docker-ce" - "device-mapper-persistent-data" - "lvm2"
