Assume nobody is using compute-0-0.

Rebooting compute-0-0 to ensure nobody or no process is running :D

1. At master node, issue following command:
        rocks set host boot compute-0-0 action=install
        ssh compute-0-0 "shutdown -r now"
2. Visit compute-0-0's machine, switch on the machine manually. The compute-0-0 will pull required Rocks installation files from master node automatically. Important: please leave your CD-ROM drive with no disk inserted in compute-0-0 machine.