We have been using HDInsight on Azure, and seen most of the scriptActions are run on the cluster are through Ambari.
Now we have NiFi cluster setup using Ambari, so need to know how do I run custom scripts through Ambari on cluster nodes ?
Scripts in HDI are different than running Nifi on Azure via Ambari. It is not available yet as an offering. You'll have to use your own automation tools to bring that in.