Flint Weller
Published © GPL3+

Install Docker Engine in Linux

Quickly install Docker Engine in Debian or Ubuntu Linux distros for reliable Yocto Project builds

BeginnerProtip15 minutes260
Install Docker Engine in Linux

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Software apps and online services

Docker Engine

Story

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Code

docker.sh

SH
Docker Engine installer script
#!/bin/bash
# Install Docker Engine on Debian or Ubuntu
# Written by Flint Weller

# Information https://docs.docker.com/engine/install/
# Debian https://docs.docker.com/engine/install/debian/
# Ubuntu https://docs.docker.com/engine/install/ubuntu/


## Clean up previous Docker installs

# Disable Docker start with systemd
sudo systemctl disable docker.service
sudo systemctl disable containerd.service

# Uninstall old versions
for pkg in docker.io docker-doc docker-compose podman-docker containerd runc; do sudo apt-get remove $pkg; done
sudo apt remove -y docker-ce docker-ce-cli containerd.io docker-buildx-plugin docker-compose-plugin

# Remove docker keyring
sudo rm -f /etc/apt/keyrings/docker.gpg

# Remove docker repo source list
sudo rm -f /etc/apt/sources.list.d/docker.list

# Remove user config directory
sudo rm -rf "${Home}/.docker"


## Start the install process

# Get the Distro ID from lsb_release
Distro_ID=$(lsb_release --id --short | tr "[:upper:]" "[:lower:]")

# Update the apt package index and install packages to allow apt to use a repository over HTTPS
sudo apt update
sudo apt -y install ca-certificates curl gnupg lsb-release

# Install the keyring directory in case it is not already there
sudo install -m 0755 -d /etc/apt/keyrings

# Add Dockers official GPG key:
case $Distro_ID in
  'debian')
    curl -fsSL https://download.docker.com/linux/debian/gpg | sudo gpg --dearmor -o /etc/apt/keyrings/docker.gpg
    ;;
  'ubuntu')
    curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo gpg --dearmor -o /etc/apt/keyrings/docker.gpg
    ;;
  *)
    exit
    ;;
esac

# Make the file read-only
sudo chmod a+r /etc/apt/keyrings/docker.gpg

# Set up the repository
case $Distro_ID in
  'debian')
    echo \
      "deb [arch="$(dpkg --print-architecture)" signed-by=/etc/apt/keyrings/docker.gpg] https://download.docker.com/linux/debian \
      "$(. /etc/os-release && echo "$VERSION_CODENAME")" stable" | \
      sudo tee /etc/apt/sources.list.d/docker.list > /dev/null
    ;;
  'ubuntu')
    echo \
      "deb [arch="$(dpkg --print-architecture)" signed-by=/etc/apt/keyrings/docker.gpg] https://download.docker.com/linux/ubuntu \
      "$(. /etc/os-release && echo "$VERSION_CODENAME")" stable" | \
      sudo tee /etc/apt/sources.list.d/docker.list > /dev/null
    ;;
  *)
    exit
    ;;
esac

# Install Docker Engine, containerd, and Docker Compose
sudo apt update
sudo apt -y install docker-ce docker-ce-cli containerd.io docker-buildx-plugin docker-compose-plugin

# Verify that the Docker Engine installation is successful
echo "-------------------------------------------------------------------------"
echo "If you see \"Hello from Docker!\" then installation is successful"
echo "-------------------------------------------------------------------------"
sudo docker run hello-world

## Linux post-install
# https://docs.docker.com/engine/install/linux-postinstall/

# Create docker group
sudo groupadd -f docker

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

# Configure Docker to start on boot with systemd
sudo systemctl enable docker.service
sudo systemctl enable containerd.service

# Fix potential permissions issue
sudo chown "$USER":"$USER" /home/"$USER"/.docker -R
sudo chmod g+rwx "${HOME}/.docker" -R

# Activate changes to groups
# newgrp opens a new shell, so we have to pass commands to it
newgrp docker << EOF

# Verify that you can run docker commands without sudo
echo "-------------------------------------------------------------------------"
echo "If you see \"Hello from Docker!\" then everything is configured properly"
echo "-------------------------------------------------------------------------"
docker run hello-world
EOF

Credits

Flint Weller
24 projects • 21 followers
NXP Dedicated Applications Processor FAE
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  • Docker
  • Internet of Things
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