install-docker.sh

#!/bin/bash

set -e

echo "Updating system..."
sudo apt update
sudo apt upgrade -y

echo "Installing prerequisite packages..."
sudo apt install -y \
    ca-certificates \
    curl \
    gnupg \
    lsb-release

echo "Setting up Docker GPG key and repository..."
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

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

echo "Updating apt package index again..."
sudo apt update

echo "Installing Docker Engine, CLI, containerd..."
sudo apt install -y docker-ce docker-ce-cli containerd.io docker-buildx-plugin docker-compose-plugin

echo "Enabling and starting Docker service..."
sudo systemctl enable docker
sudo systemctl start docker

echo "Adding user '${USER}' to docker group (you may need to log out and back in)..."
sudo usermod -aG docker $USER

echo "Docker installation complete!"
docker --version