Docker installation on ubuntu, single script

docker_install.sh

##############################################################################
# Docker Installation Script for Ubuntu                                      #
#                                                                            #
# Automates the installation of Docker on Ubuntu systems. Checks if Docker   #
# is already installed; if not, it proceeds with the installation steps.     #
#                                                                            #
# This script simplifies Docker installation on Ubuntu by updating package   #
# lists, installing necessary dependencies like ca-certificates, curl, and   #
# gnupg, setting up the Docker repository, and installing Docker CE,         #
# Docker CLI, containerd.io, docker-buildx-plugin, and docker-compose-plugin #
# packages.                                                                  #
#                                                                            #
# Usage:                                                                     #
#   - Ensure execute permissions:                                            #
#     chmod +x install_docker.sh                                             #
#   - Run the script:                                                        #
#     ./install_docker.sh                                                    #
#                                                                            #
# Author: Henrique Lobato                                                    #
# Date: January 4, 2024                                                      #
#                                                                            #
##############################################################################

set -e

if command -v docker &> /dev/null; then
    echo "Docker is already installed. Skipping installation."
    exit 0
fi

echo "Docker is not installed. Proceeding with installation..."

sudo apt-get update
sudo apt-get install -y ca-certificates curl gnupg

sudo install -m 0755 -d /etc/apt/keyrings

curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo gpg --dearmor -o /etc/apt/keyrings/docker.gpg
sudo chmod a+r /etc/apt/keyrings/docker.gpg

codename=$(lsb_release -cs)
echo "deb [arch=$(dpkg --print-architecture) signed-by=/etc/apt/keyrings/docker.gpg] https://download.docker.com/linux/ubuntu $codename stable" | sudo tee /etc/apt/sources.list.d/docker.list > /dev/null

sudo apt-get update
sudo apt-get install -y docker-ce docker-ce-cli containerd.io docker-buildx-plugin docker-compose-plugin
sudo groupadd docker
sudo usermod -aG docker $USER

sudo systemctl enable docker.service
sudo systemctl enable containerd.service

# docker run hello-world