Docker rootless initial configuration

setup-docker-rootless.sh

#!/bin/bash

if [ -f /etc/docker/daemon.json ] ; then 
  echo "/etc/docker/daemon.json already exists, refusing to overwrite it." >&2
  exit 1
fi

cat <<EOF | sudo tee /etc/docker/daemon.json
{ "userns-remap": "default" }
EOF

cat <<EOF | sudo tee -a /etc/subuid
dockremap:200000:65536
EOF
cat <<EOF | sudo tee -a /etc/subgid
dockremap:200000:65536
EOF

# Restart docker daemon:
sudo systemctl restart docker