In my previous post I discussed my plans of designing an easily scaled cluster. So far I've created an initrd of Ubuntu 6.06 running lighttpd and php5. The uncompressed size of the initrd is about 200MB. I've been able to load and run a system with this initrd, but have only had success with the stock 5.10 kernel. The 6.06 kernel panics with not being able to mount the rootfs.