Hi @AarifAkhter,  As this thread was marked 'Solved' 03-18-2017 you would have a better chance of receiving a resolution by starting a new thread. This will also provide the opportunity to provide details specific to your environment that could aid others in providing a more targeted answer to your question.      ... View more

@AarifAkhter  While setting up your maria DB have you performed the step mentioned in the doc as https://docs.cloudera.com/HDPDocuments/Ambari-2.5.2.0/bk_ambari-administration/content/using_ambari_with_mysql.html     You must pre-load the Ambari database schema into your MySQL database using the schema script. Run the script in the same location where you find the Ambari-DDL-MySQL-CREATE.sql file. You should find the Ambari-DDL-MySQL-CREATE.sql file in the /var/lib/ambari-server/resources/ directory of the Ambari Server host, after you have installed Ambari Server.     Ambari also shows this kind of message whenuser performs "ambari-server setup" while setting up the database.     WARNING: Before starting Ambari Server, you must run the following DDL directly from the database shell to create the schema: /var/lib/ambari-server/resources/Ambari-DDL-MySQL-CREATE.sql       .   Also please let us know if  your MariaDB instance running on  "localhost"  Or on "ip-172-31-9-188.xxxxxxxxxxxxxxx.internal" Can you please change the "localhost" to the hostname of the DB.     server.jdbc.hostname=ip-172-31-9-188.xxxxxxxxxxxxxxx.internal       Also please verify if the "MariaDB" exist on the mariaDB running on host 'ip-172-31-9-188.xxxxxxxxxxxxxxx.internal'     # mysql -u ambari -p Enter password: show databases;     .   ... View more