It took me quite a while to find out how the beast Galera Arbitrator (garbd) works. To safe your time here a short summary:
How to start Galera Arbitrator (garbd)
shell> ./garbd --address gcomm://192.168.13.1,192.168.13.2 --group "Our Galera Cluster" --log /tmp/garbd.log --daemon
How to stop Galera Arbitrator (gardb)
shell> killall garbd
How to start Galera Arbitrator (garbd) with a configuration file
shell>./garbd --cfg /tmp/garb.cnf --daemon
The configuration file looks as follows:
# …