The steps given here will also work for RHEL and CentOS 8
- Add Docker Repo on Rocky Linux
Add an official Docker CE repository on your Rocky Linux 8, so that we can install it without downloading its packages manually.
sudo dnf config-manager --add-repo=https://download.docker.com/linux/centos/docker-ce.repo
- Run system update
To let the system recognize the added Docker repository and the packages available in the same, run the system update that will force Rocky Linux to rebuild the system repo cache.
sudo dnf update
- Command to Install Docker CE Engine
So, we already have the Docker repo and now it’s time to run the simple command using the DNF package manager for installing the Docker-CE along with its command-line tool and containerd.io to efficiently manage the container lifecycle of its host system.
sudo dnf install docker-ce docker-ce-cli containerd.io
- Enable and Start Docker Service
Once the installation is completed, start the Docker service on your Rocky Linux and enable it to run automatically with system boot.
sudo systemctl enable docker
sudo systemctl start dockerCheck the Status of the Service to know if it is working properly.
systemctl status docker
- Add Rocky Linux User to Docker User Group
To run docker commands we need sudo rights or root access and to avoid that add your current system user to the Docker group so that you can easily run its command for downloading and creating containers.
sudo usermod -aG docker $USERCheck whether your user is in the docker group or not.
id $USERIf you want to use some other user than the current one, simply replace $USER in the above command with the specific system’s user you want to give the rights to manage Docker.
Restart the Server
To make sure all the changes work smoothly restart your host Rocky Linux server or desktop where you have installed the Docker.
To get the information and details related to installer docker such as version, several containers installed, Host kernel version, Architecture, CPU, OS Name, etc. Type:
docker info
- Test Docker by pulling Image
Let’s download some Images such as Ubuntu to create a Container and test, whether everything is working fine or not.
docker pull ubuntuThe above command will fetch the latest Image file of the LTS version i.e. Ubuntu 20.04 LTS to install and create a container corresponding to it from Docker Hub.
To know what are Images have been downloaded and available to use on your Docker system locally, run:
docker images
- Run Container
Now, we have the Docker Image of Ubuntu, let’s create and run a container using it. The command for that is very simple:
docker run -it ubuntuAfter that, you can use the Ubuntu APT package manager to run the command and install the various applications over it. Know more about its commands and work on the official documentation page.