How to resolve unsuccessful Docker installation on CentOS 8?

There are several possible reasons why installing Docker on CentOS 8 may not be successful. Here are some common troubleshooting steps:

1. System requirements check: Make sure your CentOS 8 meets the minimum requirements for Docker. This includes a 64-bit architecture, kernel version 3.10 or higher, disabling SELinux, and enabling IP forwarding, among others. You can check the kernel version by running the following command: uname -r.
2. Remove any previous installations of Docker: If you have installed Docker before, it may cause conflicts. You can remove the old Docker installation by running the following command:

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

1. Install repositories and dependencies: CentOS 8 comes with the dnf package manager by default, so you will need to install the necessary repositories and dependencies first. Run the following command:

sudo dnf -y install dnf-plugins-core
sudo dnf config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo

1. Install Docker engine: Run the following command to install the Docker engine:

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

1. Start the Docker service: Run the following command to start the Docker service and set it to start on boot:

sudo systemctl start docker
sudo systemctl enable docker

1. Verify installation: Run the following command to ensure Docker is installed correctly:

sudo docker run hello-world

If everything is working properly, you should be able to see a “Hello World” message.

If these steps still do not solve the problem, you can try searching for error messages or referring to the official Docker documentation for more troubleshooting methods.