Docker is a set of platform as a service products that use OS-level virtualization to deliver software in packages called containers. In this article, I’m going to share how to install Docker on CentOS 8 / RHEL 8.

Table of Contents

1. Uninstall old Versions
2. Set Up Repository
3. Install Docker Engine (Community)
4. Start Docker & Test
5. Uninstall Docker

Step 1 : Uninstall old Versions

If the docker is installed, uninstall them, along with associated dependencies using this command:

sudo dnf remove docker docker-client docker-client-latest docker-common docker-latest docker-latest-logrotate docker-logrotate docker-engine

Step 2 : Set Up Repository

Before going to install Docker Engine, we need to set up the Docker repository.

sudo dnf install -y yum-utils device-mapper-persistent-data lvm2

Let’s set up the stable repository:

sudo yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo

Step 3 : Install Docker Engine (Community)

Now Install the latest version of Docker Engine using this command:

sudo dnf install docker-ce --nobest

Installation completed. To install a specific version of Docker Engine – Community, you can see all available versions:

sudo dnf list docker-ce --showduplicates | sort -r

You’ll see the list like:

docker-ce.x86_64  3:18.09.1-3.el7                     docker-ce-stable
docker-ce.x86_64  3:18.09.0-3.el7                     docker-ce-stable
docker-ce.x86_64  18.06.1.ce-3.el7                    docker-ce-stable
docker-ce.x86_64  18.06.0.ce-3.el7                    docker-ce-stable

Now you can install your desired version using this command:

sudo dnf install docker-ce-<VERSION_STRING> --nobest

Step 4 : Start Docker & Test

Let’s start Docker:

sudo systemctl start docker

Enable Docker:

sudo systemctl enable docker

Check Docker status:

sudo systemctl status docker

Verify that Docker Engine – Community is installed correctly by running the hello-world image:

sudo docker run hello-world

Step 5 : Uninstall Docker

Run this command to uninstall docker:

sudo dnf remove docker-ce

To delete all images, containers, and volumes, run this command:

sudo rm -rf /var/lib/docker

The article is over. Thanks for reading.