@Veeru Muppalla Ambari-Infra comes with solr instance. It is used by Atlas and Ranger for indexing and auditing respectively. So it is required to have solr instance running for Atlas and Ranger to work. From the logs you have attached, it looks like there are no live solr nodes. No live SolrServers available to handle this request org.apache.solr.client.solrj.SolrServerException: No live SolrServers available to handle this request I would suggest to start the ambari infra component, which in-turn would bring up solr instance. Also, I can see that you have maintenance mode turned on ambari-infra component, any specific reason? This actually does not run the service check and you will not able to know its status. My recommendation is to turn-off the maintenance mode on ambari-infra and restart the service. Once this service is up and running - Atlas and Ranger should come up properly. Let me know if it works. ... View more