This article describes how to install garbd.
You should not have an even number of nodes in the Galera cluster, this can lead to split-brain/network partitioning, see more below.
To protect from split-brain, you can install gardb, an arbitrator for Galera.
To install garbd on the server "192.168.56.101" do from the UI: Manage -> Load Balancer -> Select Garbd.
Enter the IP address as shown in the picture below and click the "Install Garbd" button.
Read more about network partitioning here: http://johanandersson.blogspot.se/2012/09/garbd-how-to-avoid-network-partitioning.html
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