1. Back up Current Data

Stop the original Ambari Server.

ambari-server stop

Create a directory to hold the database backups.

cd /tmp

mkdir dbdumps

cd dbdumps/

Create the database backups.

pg_dump -U <AMBARI.SERVER.USERNAME> ambari > ambari.sql

Password: <AMBARI.SERVER.PASSWORD>

pg_dump -U <MAPRED.USERNAME> ambarirca > ambarirca.sql

Password: <MAPRED.PASSWORD>

where <AMBARI.SERVER.USERNAME>, <MAPRED.USERNAME>, <AMBARI.SERVER.PASSWORD>, and <MAPRED.PASSWORD> are the user names and passwords that you set up during installation. Default values are: ambari-server/bigdata and mapred/mapred.