Watch: Ansible Playbook for Installing Docker on Linux Systems

Learn how to install Docker on Linux systems using an Ansible playbook. Follow our guide for a seamless Docker setup and start process.

How to Install Docker in RedHat-like systems with Ansible?

I'm going to show you a live Playbook with some simple Ansible code.

I'm Luca Berton and welcome to today's episode of Ansible Pilot.

Ansible install Docker in RedHat-like systems

Add Docker key => ansible.builtin.rpm_key

Add Docker repository => ansible.builtin.yum_repository

Update yum cache and install Docker => ansible.builtin.yum

In order to install Docker on a RedHat-like system we need to perform three different steps.

The first step is to download the GPG signature key for the repository. You are going to use the ansible.builtin.rpm_key Ansible module.

This encrypted key verifies the genuinity of the packages and the repository and guarantees that the software is the same as Docker releases.

The second step is to add the add Docker repository to the distribution. It's an extra website where yum/DNF, your distribution package manager looks like for software.

You are going to use the ansible.builtin.yum_repository Ansible module.

The third step is to update the yum cache for the available packages and install Docker using the ansible.builtin.yum Ansible module.

Parameters

rpm_key key string - URL

rpm_key state string - present/absent

yum_repository name string - repository

yum_repository baseurl string - URL

yum_repository gpgcheck boolean gpgkey string - GPG check and key URL

yum name string - name or package specific

yum state string - latest/present/absent

yum update_cache boolean - no/yes

For the ansible.builtin.rpm_key Ansible module I'm going to use two parameters: "key" and "state".

The "key" parameter specifies the URL or the key ID of the repository GPG signature key and the "state" verify that is present in our system after the execution.

For the ansible.builtin.yum_repository Ansible module I'm going to use four parameters: "name", "baseurl", "gpgcheck" and "gpgkey".

The "name" parameter specifies the repository parameters and the "baseurl" URL of it.

The "gpgcheck" parameter enables the GPG verification with the URL specified in "gpgkey" parameter.

For the ansible.builtin.yum Ansible module I'm going to use three parameters: "name", "state", and "update_cache".

The "name" parameter specifies the package name (Docker in our use-case) and the "state" verify that is present in our system after the execution.

Before installing the package the "update_cache" performs an u