docs/examples/compute/deployment_single_step_install_public_key.py

from __future__ import with_statement

import os

from libcloud.compute.types import Provider
from libcloud.compute.providers import get_driver
from libcloud.compute.deployment import SSHKeyDeployment

# Path to the public key you would like to install
KEY_PATH = os.path.expanduser('~/.ssh/id_rsa.pub')

RACKSPACE_USER = 'your username'
RACKSPACE_KEY = 'your key'

Driver = get_driver(Provider.RACKSPACE)
conn = Driver(RACKSPACE_USER, RACKSPACE_KEY)

with open(KEY_PATH) as fp:
    content = fp.read()

# Note: This key will be added to the authorized keys for the root user
# (/root/.ssh/authorized_keys)
step = SSHKeyDeployment(content)

images = conn.list_images()
sizes = conn.list_sizes()

# deploy_node takes the same base keyword arguments as create_node.
node = conn.deploy_node(name='test', image=images[0], size=sizes[0],
                        deploy=step)