Is Nimbus hard to install?
Nimbus itself is not hard to install, it has a script driven install option that asks you questions (see the administrator guide for details). Nimbus requires that some dependencies are installed first. On the service node: Java (1.5+) and bash. On the hypervisor nodes: Python (2.3+), bash, ebtables, DHCPd, and Xen (2 works but 3 is recommended). All of these things are installable via the package management system of all the popular Linux distributions.