Complete Guide: Installing Docker and Docker Compose on Rocky Linux
In this guide, we will see how to install Docker and Docker Compose on Rocky Linux, both manually and through an Ansible playbook.
Complete Guide: Installing Docker and Docker Compose on Rocky Linux
Docker is a platform that automates the deployment of applications in containers, while Docker Compose allows you to define and manage multi-container applications. In this guide, we will see how to install Docker and Docker Compose on Rocky Linux, both manually and through an Ansible playbook.
Requirements
Root access or a user with sudo privileges
Internet connection to download packages
Server running Rocky Linux (version 8 or 9)
Section 1: Manual Installation of Docker and Docker Compose on Rocky Linux
1.1 Update the system
Before starting the installation, update the system to ensure all packages are up to date:
sudo dnf update -y
1.2 Add the Docker repository
To install Docker, add the official Docker repository:
sudo dnf config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo
1.3 Install Docker
Now install Docker:
sudo dnf install docker-ce docker-ce-cli containerd.io docker-buildx-plugin docker-compose-plugin -y
1.4 Start and enable Docker
Start Docker and ensure it starts automatically at boot:
sudo systemctl start docker
sudo systemctl enable docker
1.5 Verify Docker installation
To check if Docker was installed correctly:
sudo docker --version
Additionally, you can run a test container:
sudo docker run hello-world
1.6 Install Docker Compose
Docker Compose is included in the docker-compose-plugin, but if you want to install a specific version manually, follow these steps:
Download the latest version of Docker Compose:
sudo curl -L "https://github.com/docker/compose/releases/download/v2.21.0/docker-compose-$(uname -s)-$(uname -m)" -o /usr/local/bin/docker-compose
Apply executable permissions:
sudo chmod +x /usr/local/bin/docker-compose
Verify Docker Compose installation:
docker-compose --version
Now Docker and Docker Compose are installed and ready to use!
Section 2: Installing Docker and Docker Compose with Ansible
If you prefer automating the process, you can use an Ansible playbook. This approach is particularly useful if you are managing multiple servers or environments.
2.1 Installing Ansible
To install Ansible on your control machine, run the following commands:
sudo dnf install epel-release -y
sudo dnf install ansible -y
2.2 Writing the Ansible playbook
Create a file called install_docker.yml with the following content:
---
- name: Install Docker and Docker Compose on remote machine
hosts: all
become: yes
tasks:
- name: Ensure python3-dnf is installed (for RHEL/CentOS)
package:
name: python3-dnf
state: present
- name: Add Docker repository
yum_repository:
name: docker
description: Docker Repository
baseurl: https://download.docker.com/linux/centos/7/x86_64/stable/
gpgcheck: yes
enabled: yes
gpgkey: https://download.docker.com/linux/centos/gpg
- name: Install Docker
yum:
name:
- docker-ce
- docker-ce-cli
- containerd.io
state: latest
- name: Start and enable Docker
systemd:
name: docker
enabled: yes
state: started
- name: Check Docker installation
command: docker version
- name: Show Docker version
command: docker --version
- name: Get Docker Compose binary name
command: "uname -s"
register: uname_s
- name: Get architecture
command: "uname -m"
register: uname_m
- name: Install Docker Compose
get_url:
url: "https://github.com/docker/compose/releases/latest/download/docker-compose-{{ uname_s.stdout }}-{{ uname_m.stdout }}"
dest: /usr/local/bin/docker-compose
mode: '0755'
- name: Check Docker Compose installation
command: docker compose version
2.3 Running the Ansible playbook
Save the file and ensure your Ansible inventory file (e.g., hosts.ini) contains the hosts where you want to install Docker.
Run the playbook:
ansible-playbook -i hosts.ini install_docker.yml
This playbook will install Docker and Docker Compose, start Docker, and verify their versions.
Section 3: Final Considerations
In this guide, we explored two methods to install Docker and Docker Compose on Rocky Linux: manually and using Ansible. Manual installation is ideal for simpler environments or testing, while Ansible automates the process, making it easier to manage multiple servers. Depending on your needs, you can choose the method that suits you best.
Maintenance Tips
Remember to regularly update Docker to benefit from new features and security patches.
You can use Ansible to automate the update of Docker and Docker Compose across multiple servers.
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With this detailed guide, you will be able to efficiently install and configure Docker and Docker Compose on Rocky Linux, whether manually or by automating the process with Ansible.