In the early December last year, Red Hat took us all by surprise with the CentOS 8 End Of Life (EOL) announcement, that was scheduled for the end of 2021. In response to this, the original CentOS founder has created a fresh project which is called Rocky Linux. The project quickly gained its popularity among many clients of the cloud computing giants AWS, Azure and Google Cloud. This is a great opportunity for the distro to proof Docker capabilities.
In the following steps, we will see how we can quickly install and setup Docker CE.
Prerequisites
- Rocky Linux 8
- sudo privileges
Add Docker repository
Step 1. Update system OS packages.
sudo dnf update -y
Step 2. Add Docker repository.
sudo dnf config-manager --add-repo=https://download.docker.com/linux/centos/docker-ce.repo
Output:
Adding repo from: https://download.docker.com/linux/centos/docker-ce.repo
Step 3. We can confirm it by listing current enabled repositories.
dnf repolist
Output:
repo id repo name
appstream Rocky Linux 8 - AppStream
baseos Rocky Linux 8 - BaseOS
docker-ce-stable Docker CE Stable - x86_64
extras Rocky Linux 8 - Extras
Install Docker
Step 4. Install Docker.
sudo dnf install -y docker-ce docker-ce-cli containerd.io
Step 5. Enable Docker to start on boot.
sudo systemctl enable --now docker
Output:
Created symlink /etc/systemd/system/multi-user.target.wants/docker.service → /usr/lib/systemd/system/docker.service.
Step 6. Start Docker service.
sudo systemctl start docker
Verify and test Docker installation
Step 7. To verify Docker service running, run the following command:
sudo systemctl status docker
Step 8. As a best practice, we should always run Docker as a non-root user (user without sudo privileges).
sudo usermod -aG docker $USER
Step 9. Confirm that you are part of the docker group.
groups
Output:
devcoops docker
Step 10. Make sure you can run Docker commands.
sudo docker --version
Output:
Docker version 20.10.7, build f0df350
Step 11. Let’s test things out by spinning up a hello-world container.
sudo docker run --rm --name test-me hello-world
Conclusion
Installing Docker on Rocky Linux 8 should be an easy procedure, and it’s kinda the same as installing on any other Linux distribution. In some of the future posts, we will cover on how you can install Docker Compose as well. Feel free to leave a comment below and if you find this tutorial useful, follow our official channel on Telegram.
