Install Docker CE on Rocky Linux 8

Installing Docker CE on Rocky Linux 8

Docker has a dedicated CentOS repository that we can apply to Rocky Linux. So, the ideal would be to add it to the system and install it from there.

First access your server via SSH or, if you are using Rocky Linux from the desktop, open a terminal.

Now install the yum-utils package.

sudo dnf install yum-utils

With this package installed, we can add the Docker repository.

sudo yum-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

If you want to check if the repository has been successfully added, you can run

sudo dnf repolist

sudo dnf install docker-ce docker-ce-cli containerd.io

With this process, Docker is already installed, but its service is not started.

To start the Docker service, run

sudo systemctl start docker

It is convenient that the service starts with the system, to do this

sudo systemctl enable docker

Output:

Created symlink /etc/systemd/system/multi-user.target.wants/docker.service ? /usr/lib/systemd/system/system/docker.service

Finally, you can check the status of the service

sudo systemctl status docker

In conclusion, Docker is installed correctly.

Using Docker requires root permissions. This can be a problem for many people, so a real option would be to add the user to the docker group.

To complete this, run the following command

sudo usermod -aG docker $USER

Now, you can run Docker and for this you can use the test image.

docker run hello-world