In addition the Rackspace API supports injecting a file into the API post request which will be placed into the system as it is initialized. The intent of this

In addition the Rackspace API supports injecting a file into the API post request which will be placed into the system as it is initialized. The intent of this is to inject some sort of individual identifier to a server, which could be in the form of an ID number that is read by a boot script in your gold image, but other useful scenarios that would work would be to inject the root password you want or to disable root login entirely and inject an ssh public key file for a non-root account.