On the Ambari Server host, stop the Ambari Server:

ambari-server stop

To modify the PID location, edit the Ambari Server properties file:

vi /etc/ambari-server/conf/ambari.properties

Modify the pid.dir property and save the file:

pid.dir=/var/run/ambari-server

To modify the Log location, edit the Ambari Server log4j file:

vi /etc/ambari-server/conf/log4j.properties

Modify the ambari.log.dir property and save the file:

ambari.log.dir=${ambari.root.dir}/var/log/ambari-server

Create the new directories and be sure to set the directory ownership and permissions to allow the Ambari Server process access.

Restart the Ambari Server.

ambari-server start