Install Docker Engine on Ubuntu

install-docker-ubuntu.sh

#!/bin/bash
#---------------------------------------------------------------------------------------
#  Script to Install Docker Engine on Ubuntu
#  Source: https://gist.github.com/alexishida/269ae3891657e2c0bd8c25ad4d65ee6f
#
#  Author: Alex Ishida <[email protected]>
#  Version: 1.0.0 - 21/10/2025
#
# References:
# https://docs.docker.com/engine/install/ubuntu/
# https://docs.docker.com/engine/install/linux-postinstall/
#---------------------------------------------------------------------------------------

# Exit on error and undefined variables
set -eu

# Add Docker's official GPG key:
sudo apt-get update
sudo apt-get install ca-certificates curl
sudo install -m 0755 -d /etc/apt/keyrings
sudo curl -fsSL https://download.docker.com/linux/ubuntu/gpg -o /etc/apt/keyrings/docker.asc
sudo chmod a+r /etc/apt/keyrings/docker.asc

# Add the repository to Apt sources:
echo \
  "deb [arch=$(dpkg --print-architecture) signed-by=/etc/apt/keyrings/docker.asc] https://download.docker.com/linux/ubuntu \
  $(. /etc/os-release && echo "${UBUNTU_CODENAME:-$VERSION_CODENAME}") stable" | \
  sudo tee /etc/apt/sources.list.d/docker.list > /dev/null

# Install Docker
sudo apt-get update
sudo apt-get install -y docker-ce docker-ce-cli containerd.io docker-buildx-plugin docker-compose-plugin

# Run Docker as a non-root user
sudo groupadd docker
sudo usermod -aG docker $USER

echo "Docker installation completed successfully! =)"
echo "Please log out and log back in for group changes to take effect."
echo "You can test with: docker run hello-world"