Copy the rudder-multiserver-setup directory to you instance.
Run rudder-relay-top.sh as root, replace <rudder-*> with the hostname of the corresponding instance:
cd rudder-multiserver-setup ./rudder-web.sh <rudder-web> <rudder-ldap> <rudder-db> <rudder-relay-top>
Connect rudder web interface and accept all nodes. Then run the following command where <relay-uuid> is the uuid from rudder-relay-top setup.
/opt/rudder/bin/rudder-node-to-relay <relay-uuid>