Install Docker on Ubuntu

install_docker.sh

#!/bin/bash

# Ref. https://docs.docker.com/engine/install/ubuntu/

# Remove existing Docker packages
for pkg in docker.io docker-doc docker-compose docker-compose-v2 podman-docker containerd runc; do sudo apt-get remove -y $pkg; done

# Add Docker's official GPG key
sudo apt-get update
sudo apt-get install -y 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 Docker repository to Apt sources
echo \
  "deb [arch=$(dpkg --print-architecture) signed-by=/etc/apt/keyrings/docker.asc] https://download.docker.com/linux/ubuntu \
  $(. /etc/os-release && echo "$VERSION_CODENAME") stable" | \
  sudo tee /etc/apt/sources.list.d/docker.list > /dev/null
sudo apt-get update

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

# Verify Docker installation
if ! sudo docker run hello-world; then
    echo "Docker installation failed. Please check the error messages above."
    exit 1
fi

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

echo "Docker has been successfully installed and the current user has been added to the docker group."
echo "Please log out and log back in for the group changes to take effect."