Unable to launch spark master in the Swarm

[richiesgr]

Hi
Very good article but I do not succeed to make it working.
When I try to start the master node I get

java.net.BindException: Cannot assign requested address: Service 'sparkMaster' failed after 16 retries (starting from 7077)! Consider explicitly setting the appropriate port for the service 'sparkMaster' (for example spark.ui.port for SparkUI) to an available port or increasing spark.port.maxRetries.

Do you have experienced this problem ?
Thanks