gistfile1.rb

# use fog to bootstrap a Rackspace cloud server 
# since it does not have user-data like ec2

@compute = Fog::Compute.new(...)

server = @compute.servers.create(....)

server.wait_for { ready? }  

server.private_key =  IO.read("~/.ssh/foo")
server.public_key = IO.read("~/.ssh/foo.pub")
server.username = 'root'
server.setup :password => server.password
server.ssh ["echo '#{user_data}' > /root/bootstrap.sh",
         "chmod +x /root/bootstrap.sh", 
         "/root/bootstrap.sh &"]