Install Docker Engine on RHEL8 or RHEL9

instsall_docker.sh

#!/bin/bash

# This script installs Docker Community Edition on RHEL 9 and performs necessary post-installation steps.
# Based on the instructions at https://docs.docker.com/engine/install/rhel/
# 
# License: ATTRIBUTION-SHAREALIKE 4.0 INTERNATIONAL (https://creativecommons.org/licenses/by-sa/4.0/)
# By: Eric A. Soto, [email protected]

# Exit immediately if a command exits with a non-zero status
set -e

# Uninstall old versions if they exist
sudo yum remove -y docker \
                  docker-client \
                  docker-client-latest \
                  docker-common \
                  docker-latest \
                  docker-latest-logrotate \
                  docker-logrotate \
                  docker-engine

# Set up the repository
sudo yum install -y yum-utils
sudo yum-config-manager --add-repo https://download.docker.com/linux/rhel/docker-ce.repo

# Install the latest version of Docker CE
sudo yum install -y docker-ce docker-ce-cli containerd.io docker-buildx-plugin docker-compose-plugin

# Start and enable Docker service
sudo systemctl start docker
sudo systemctl enable docker

# Post-installation steps

# Create the docker group if it doesn't exist
if ! getent group docker >/dev/null; then
    sudo groupadd docker
fi

# Add the current user to the docker group
sudo usermod -aG docker $USER

# Refresh group membership for the current session
newgrp docker <<END
# Verify Docker installation without sudo
docker run hello-world

# Print Docker version to confirm everything is set up correctly
docker --version
END

echo "Docker installation and configuration complete. You can use Docker without needing to log out and back in."