Hi @PURUSHOTHAMAN_S    I can see there are a lot of alerts(28) in Ambari, if I were you I will start checking with HDFS service at first like namenode are up and running because it is vital for other services to come up. Then you may need to check YARN and then you can concentrate on others.   Check out the Ambari startup logs to see why and where it is getting failed.   Hope it helps. ... View more