Install Docker CE on WSL2

install-docker.sh

#!/bin/bash
set -eu

echo Install Docker on WSL2 Ubuntu
echo =============================
echo It will prompt to input password for sudo.
echo

# Setup repo

source /etc/os-release

if [[ ${ID} != "ubuntu" ]]; then
  echo Current system is not Ubuntu
  exit 1
fi

curl -fsSL https://download.docker.com/linux/${ID}/gpg | sudo apt-key add -
echo "deb [arch=amd64] https://download.docker.com/linux/${ID} ${VERSION_CODENAME} stable" | sudo tee /etc/apt/sources.list.d/docker.list

# == Install docker

sudo apt update
sudo apt -y upgrade
sudo apt -y install docker-ce docker-ce-cli containerd.io docker-compose-plugin

# == Setup permission

sudo usermod -aG docker $USER
sudo groupmod -g 36257 docker
sudo chmod u+s /usr/bin/dockerd
if ! sudo grep -q dockerd /etc/sudoers; then
cat << 'EOF' | sudo EDITOR='tee -a' visudo

# Run dockerd without password
ALL ALL=NOPASSWD: /usr/bin/dockerd
EOF
fi

# == Share docker socket between WSL distributions
# == (Remove this section if no need to share docker socket)
DOCKER_DIR=/mnt/wsl/shared-docker
mkdir -pm o=,ug=rwx "$DOCKER_DIR"
sudo chgrp docker "$DOCKER_DIR"

sudo mkdir -p /etc/docker/
cat << EOF | sudo tee /etc/docker/daemon.json > /dev/null
{
  "hosts": ["unix:///mnt/wsl/shared-docker/docker.sock"]
}
EOF

# == Setup environment in bashrc
# == (Remove this section if no need to share docker socket)
if ! grep -q DOCKER_HOST ~/.bashrc; then
cat << 'EOF' | tee -a ~/.bashrc > /dev/null

DOCKER_DIR=/mnt/wsl/shared-docker
DOCKER_SOCK="$DOCKER_DIR/docker.sock"
export DOCKER_HOST="unix://$DOCKER_SOCK"
EOF
fi


# == Done
cat << 'EOF'

Install finished.

To start docker service, run:
  sudo service docker start

Then try docker with:
  docker run hello-world

To debug docker daemon running issue, check log file: /var/log/docker.log

To run docker-compose:
  docker compose help

EOF