3. Install the New Server and Populate the Databases

Install the Server on the new host.

Stop the Server so that you can copy the old database data to the new Server.

ambari-server stop

Restart the PostgreSQL instance.

service postgresql restart

Open the PostgreSQL interactive terminal.

su - postgres
psql

Using the interactive terminal, drop the databases created by the fresh install.

drop database ambari;
drop database ambarirca;

Check to make sure the databases have been dropped.

/list

The databases should not be listed.

Create new databases to hold the transferred data.

create database ambari;
create database ambarirca;

Exit the interactive terminal.

^d

Copy the saved data from Back up Current Data to the new Server.

cd /tmp
scp -i <ssh-key> root@<original-server>/tmp/dbdumps/*.sql/tmp
(Note: compress/transfer/uncompress as needed from source to dest)
psql -d ambari -f /tmp/ambari.sql
psql -d ambarirca -f /tmp/ambarirca.sql

Start the new Server.

<exit to root>
ambari-server start

On each Agent host, start the Agent.

ambari-agent start

Open Ambari Web. Point your compatible browser to:

<new_Ambari_Server>:8080

Go to Services -> MapReduce and use the Management Header to Stop and Start the MapReduce service.

Start other services as necessary.