Artemis service is not logging anything when started from second instance of broker on the same machine. There is no exception in the logs, etc. The only indication of a failure is the start script itself failing with proper ecode. Log is completely empty.

0,root@r7x0_mtoth opt]$ /opt/jboss-amq-7-snap/bin/artemis-service start
Starting artemis-service
Could not start artemis-service
[1,root@r7x0_mtoth opt]$ 

When started using artemis run: NPE.

[130,root@r7x0_mtoth opt]$ /opt/jboss-amq-7-snap/bin/artemis run
Error: Exception thrown by the agent : java.lang.NullPointerException
[1,

Still no update about real problem of another broker being up and having bound needed ports.

How AMQ6 behaves under same scenario:
1) start broker1 -> everything is ok
2) start broker2 ->

1. start-script ecode 0
2. Binding exceptions are written in logs
3. Every 10 seconds this broker tries to bind ports and start
   3) shutdown broker1. broker2 finally binds needed ports and is happily up.