The Rocks way of installing the roll is as usual to reinstall your frontend and compute nodes, but you can also use the chain of commands to install a new roll on an existing frontend (with or without a previous version of the roll):
# rocks add roll /path/to/demo/roll.iso
# rocks enable roll demo
# rocks create distro
# rocks run roll demo | sh
# reboot
After the the frontend comes back up you should do the following to populate the node list:
# rocks sync config
then kickstart all your nodes
# tentakel /boot/kickstart/cluster-kickstart
After the nodes are reinstalled they should automatically pop up in the queueing system.
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