What you'll need
The only things you'll need are:
- A working instance of CentOS 8, you can order one real quick here
- A user with sudo privileges
How to add the necessary Docker repository
We're going to be using the dnf config-manager utility to add the Docker repository. To do this, open a terminal window and issue the command:
sudo dnf config-manager --add-repo=https://download.docker.com/linux/centos/docker-ce.repo
How to locate an installable version of Docker CE
As of now, Red Hat has blocked the installation of docker-ce, so if you attempt to run the command sudo dnf install docker-ce, it will fail. Instead, you must install a specific version of Docker. To find out which versions are available, issue the command:
dnf list docker-ce --showduplicates | sort -r
From that list, we can see version docker-ce-3:18.09.1-3.el7 is available for installation
How to install Docker CE
To install that version, issue the command:
sudo dnf install docker-ce-3:18.09.1-3.el7
In order to force DNS resolution to work within Docker containers, the firewalld must be disabled. To do that, issue the command:
sudo systemctl disable firewalld
Next we'll start and enable the docker daemon with the command:
sudo systemctl enable --now docker
Finally, add your user to the docker group with the command:
sudo usermod -aG docker $USER
Congratulations, you now have Docker CE running and ready to work on CentOS 8. Begin deploying those containerized applications.
