After Install Rocks 6.2, now you can install the compute nodes.
1) (Directions follow http://www.rocksclusters.org/assets/usersguides/roll-documentation/base/6.2/install-compute-nodes.html)
Login to the frontend node as root. Make sure all the compute nodes are powered off.
2) To install every single node: insert-ethers
3) select "Compute"
4) Inserted Appliances will show blank
5) With a monitor and keyboard attached to the first node power it up and select PXE boot (F12)
6) The compute node will send a DHCP request to the frontend which will show the computer node as 'discovered'
7) The frontend will go back to the Inserted Appliances screen. Once the compute node is discovered you can move to the next node
8) Once (*) follows each node on the Inserted Appliances screen they have all been kickstarted
9) When all nodes are installed hit "F10" to quit insert ethers