@Buithuy96  First and foremost re-running these steps won't do damage to your cluster I assure you. What you have is purely a permissions issue java.sql.SQLException: Access denied for user 'ambari'@'mtnode.hdp.vn' (using password: YES) Revalidate the MySQL connector # yum install -y mysql-connector-java # ambari-server setup --jdbc-db=mysql --jdbc-driver=/usr/share/java/mysql-connector-java.jar Re-run the Ambari user setup CREATE USER 'ambari'@'%' IDENTIFIED BY 'aCtct@123'; CREATE USER 'ambari'@'localhost' IDENTIFIED BY 'Ctct@123'; GRANT ALL PRIVILEGES ON *.* TO 'ambari'@'%'; GRANT ALL PRIVILEGES ON *.* TO 'ambari'@'localhost'; GRANT ALL PRIVILEGES ON *.* TO 'ambari'@'mtnode.hdp.vn'; GRANT ALL PRIVILEGES ON *.* TO 'ambari'@'mtnode.hdp.vn' IDENTIFIED BY 'Ctct@123'; FLUSH PRIVILEGES; Try restarting Ambari while tailing the ambari-server.log and share the contents, first reset the log before starting Ambari, to ensure you have a minimum log to delve through # truncate --size 0 /var/logs/ambari-server/ambari-server.log Restart your Ambari server and tail the logs # tail -f /var/logs/ambari-server/ambari-server.log Share the status ... View more