Note: I’m putting build ISOs and Sledgehammer TARs on crowbar.zehicle.com if you don’t want to follow these steps then download the ISO. We are updating the ISO daily, so don’t assume that you have that latest!
To build Crowbar, you need a Linux machine and access to the internet. The video shows how you can use an Ubuntu 10.10 Rackspace Cloud Server. We build Crowbar inside our firewall on our PCs too. No matter how you do it, Crowbar is full of fuzzily delicious cloud bits.
For up-to-date instructions, see the Crowbar wiki Build ISO page.