Prepare a local configuration directory to run as an unprivileged user mkdir etc chown 10001:10001 -R etc Initialize the database and schema and a configuration directory docker-compose run horizon -i Start service in background docker-compose up -d You can also use this command when you run upgrades. You must delete the file etc/configured file first. It works as a guard to prevent unnecessary database migration runs on startup. Show configuration changes from a pristine system with docker-compose exec -w /opt/opennms/bin horizon ./config-diff.sh -d. If you changed your configuration files manually you can run the configuration tester with docker-compose exec horizon bin/config-tester -a