I migrated a few Rails sites over from Slicehost to Linode, and since I was using Moonshine (which is a Rails-specific wrapper over Puppet) it was very easy. I

I migrated a few Rails sites over from Slicehost to Linode, and since I was using Moonshine (which is a Rails-specific wrapper over Puppet) it was very easy. I just deployed to the Linode server with "cap deploy:setup; cap deploy", copied the databases over, and cut over the DNS. Moonshine handled installing Ruby, MySQL, Apache, configuring SSH and firewall, creating databases and database users, etc.