Supporting clustering and ha config for vertx:runMod 

Additional configuration options:
<ul>
<li>cluster (default: false)</li>
<li>clusterHost</li>
<li>clusterPort (default 0)</li>
<li>clusterManagerFactory (default org.vertx.java.spi.cluster.impl.hazelcast.HazelcastClusterManagerFactory)</li>
<li>ha (default false)</li>
<li>hagroup (default __ DEFAULT __)</li>
<li>quorum (default 0)</li>
</ul>

Example that enables clustering with minimal config:
<pre>
&lt;configuration&gt;
    ...
    &lt;cluster&gt;true&lt;/cluster&gt;
&lt;/configuration&gt;
</pre>