install-docker.sh

#!/usr/bin/env bash
# shellcheck disable=SC1091

if [ "$1" != "--reinstall" ]; then
  # exit if docker is already installed
  if [[ $(which docker) && $(docker --version) ]]; then
    echo "Docker already installed"
    echo "Use --reinstall to reinstall"
    exit 0
  fi
  echo "Installing Docker..."
else
  echo "Reinstalling Docker..."
fi

sleep 2

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

is_ubuntu() {
  if [ -f /etc/os-release ]; then
    . /etc/os-release
    
    if [[ "$ID_LIKE" == *"ubuntu"* || -z "${UBUNTU_CODENAME:-}" ]]; then
      return 0
    fi
  fi

  return 1
}

remove_docker_packages() {
  # remove old docker packages
  echo "## Removing old docker packages..."
  sudo apt-get remove docker.io docker-doc docker-compose docker-compose-v2 podman-docker containerd runc -y &>/dev/null || true
  # remove newer docker packages
  echo "## Removing newer docker packages..."
  sudo apt-get remove docker-ce docker-ce-cli containerd.io docker-buildx-plugin docker-compose-plugin -y &>/dev/null || true
}

remove_docker_keys() {
  # remove any old keys
  echo "## Removing old keys..."
  sudo rm -f /etc/apt/keyrings/docker.asc &>/dev/null
  sudo rm -f /etc/apt/keyrings/docker.gpg &>/dev/null
  sudo rm -f /etc/apt/sources.list.d/docker.list &>/dev/null
}

install_docker_keys() {
  # Add Docker's official GPG key:
  echo "## Adding Docker's official GPG key..."
  sudo apt-get update -y
  sudo apt-get install ca-certificates curl -y
  sudo install -m 0755 -d /etc/apt/keyrings
  if is_ubuntu; then
    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
  else
    sudo curl -fsSL https://download.docker.com/linux/debian/gpg -o /etc/apt/keyrings/docker.asc
    sudo chmod a+r /etc/apt/keyrings/docker.asc
  fi
}

add_docker_repository() {
  # Add the repository to Apt sources:
  if is_ubuntu; then
    echo "## Adding Docker repository for Ubuntu..."
    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:-$VERSION_CODENAME}") stable" |
      sudo tee /etc/apt/sources.list.d/docker.list >/dev/null
  else
    echo "## Adding Docker repository for Debian..."
    echo \
      "deb [arch=$(dpkg --print-architecture) signed-by=/etc/apt/keyrings/docker.asc] https://download.docker.com/linux/debian \
    $(. /etc/os-release && echo "$VERSION_CODENAME") stable" |
      sudo tee /etc/apt/sources.list.d/docker.list >/dev/null
  fi

  sudo apt-get update
}

install_docker_packages() {
  echo "## Installing Docker packages..."
  sudo apt-get install docker-ce docker-ce-cli containerd.io docker-buildx-plugin docker-compose-plugin -y
}

post_install() {
  echo "## Docker post installation..."
  sudo ln -sf /usr/libexec/docker/cli-plugins/docker-compose /usr/bin/docker-compose
  sudo groupadd docker &>/dev/null || true
  sudo usermod -aG docker "$USER" &>/dev/null || true
  mkdir -p "$HOME/.docker" &>/dev/null || true
  sudo chown "$USER":"$USER" "$HOME/.docker" -R &>/dev/null || true
  sudo chmod g+rwx "$HOME/.docker" -R &>/dev/null || true
  # newgrp docker &>/dev/null || true
  echo "Added $USER to the docker group"
}

confirm_docker_installation() {
  #  check if docker installed
  if [[ $(which docker) && $(docker --version) ]]; then
    echo "## Docker installed successfully"
  else
    echo "## Docker installation failed"
    exit 1
  fi
}

# do it
remove_docker_packages &&
  remove_docker_keys &&
  install_docker_keys &&
  add_docker_repository &&
  install_docker_packages &&
  post_install &&
  confirm_docker_installation &&
  echo "" &&
  docker --version &&
  docker compose version

Docker Installer Script

This script automatically installs the latest version of Docker and Docker Compose on Debian, Ubuntu-based systems (Ubuntu, Pop!_OS), and Windows WSL environments. It handles the entire installation process including removing old versions, adding Docker's official repository, configuring permissions, and adding your user to the Docker group for rootless operation.

Installation Options

Run directly from CLI

curl -fsSL https://gist.githubusercontent.com/jasenmichael/4aea6c4a698296fc7a3105b6d0998b06/raw/install-docker.sh | bash
# or reinstall existing Docker installation
# curl -fsSL https://gist.githubusercontent.com/jasenmichael/4aea6c4a698296fc7a3105b6d0998b06/raw/install-docker.sh | bash -s -- --reinstall

Download and run locally

cd <your-scripts-dir>
curl -fsSL https://gist.githubusercontent.com/jasenmichael/4aea6c4a698296fc7a3105b6d0998b06/raw/install-docker.sh -o ./install-docker.sh
chmod +x ./install-docker.sh
./install-docker.sh

# or reinstall existing Docker installation
# ./install-docker.sh --reinstall

After installation, you may need to log out and back in for group permissions to take effect, or run newgrp docker to use Docker without restarting your session.