openstacksdk/doc/source/user/guides/intro.rst

Getting started

openstacksdk aims to talk to any OpenStack cloud. To do this, it requires a configuration file. openstacksdk favours clouds.yaml files, but can also use environment variables. The clouds.yaml file should be provided by your cloud provider or deployment tooling. An example:

clouds:
 mordred:
   region_name: Dallas
   auth:
     username: 'mordred'
     password: XXXXXXX
     project_name: 'demo'
     auth_url: 'https://identity.example.com'

More information on configuring openstacksdk can be found in /user/config/configuration.

Given sufficient configuration, you can use openstacksdk to interact with your cloud. openstacksdk consists of three layers. Most users will make use of the proxy layer. Using the above clouds.yaml, consider listing servers:

import openstack

# Initialize and turn on debug logging
openstack.enable_logging(debug=True)

# Initialize connection
conn = openstack.connect(cloud='mordred')

# List the servers
for server in conn.compute.servers():
    print(server.to_dict())

openstacksdk also contains a higher-level cloud layer based on logical operations:

import openstack

# Initialize and turn on debug logging
openstack.enable_logging(debug=True)

# Initialize connection
conn = openstack.connect(cloud='mordred')

# List the servers
for server in conn.list_servers():
    print(server.to_dict())

The benefit of this layer is mostly seen in more complicated operations that take multiple steps and where the steps vary across providers. For example:

import openstack

# Initialize and turn on debug logging
openstack.enable_logging(debug=True)

# Initialize connection
conn = openstack.connect(cloud='mordred')

# Upload an image to the cloud
image = conn.create_image(
    'ubuntu-trusty', filename='ubuntu-trusty.qcow2', wait=True)

# Find a flavor with at least 512M of RAM
flavor = conn.get_flavor_by_ram(512)

# Boot a server, wait for it to boot, and then do whatever is needed
# to get a public IP address for it.
conn.create_server(
    'my-server', image=image, flavor=flavor, wait=True, auto_ip=True)

Finally, there is the low-level resource layer. This provides support for the basic CRUD operations supported by REST APIs and is the base building block for the other layers. You typically will not need to use this directly:

import openstack
import openstack.config.loader
import openstack.compute.v2.server

# Initialize and turn on debug logging
openstack.enable_logging(debug=True)

# Initialize connection
conn = openstack.connect(cloud='mordred')

# List the servers
for server in openstack.compute.v2.server.Server.list(session=conn.compute):
    print(server.to_dict())