Running Multiple Docker Instances

Overview

This guide explains how to run both rootful and rootless Docker instances on Ubuntu 22.04.

Setup Instructions

Install rootless Docker:

dockerd-rootless-setuptool.sh install 
systemctl --user start docker.service

Configure Docker daemon:

# For rootful Docker
export DOCKER_HOST="unix:///var/run/docker.sock"
 
# For rootless Docker
export DOCKER_HOST="unix://$XDG_RUNTIME_DIR/docker.sock"

Notes

Both instances work independently
Separate image caches and container lists
Network setups may require additional configuration

Docker Root Docker Rootless Rpm