# Avoiding Port Collisions by Launching Multiple Quarkus Instances in DEV Mode

Quarkus started in development (quarkus:dev) mode with a JAX-RS endpoint exposed, opens two ports: (http) 8080 and (debug) 5005 per default.

You will have to assign distinct ports for every new launched instance.
The http port is configurable in the application.properties: quarkus.http.port=8282 or environment entries 
(not suitable for our purpose), the debug port can be changed (-Ddebug=6000) 
or deactivated from the command line only: mvn compile -Ddebug=false quarkus:dev