...
In server.xml use the following:
<Cluster className="org.apache.catalina.ha.tcp.SimpleTcpCluster">
<Channel className="org.apache.catalina.tribes.group.GroupChannel">
<Membership className="org.apache.catalina.tribes.membership.cloud.CloudMembershipService"/>
</Channel>
</Cluster>
2 - Example there is an example to use it with OpenShift in https://github.com/jfclere/tomcat-kubernetes