openstacksdk is a client library for building applications to work with OpenStack clouds. The project aims to provide a consistent and complete set of interactions with OpenStack's many services, along with complete documentation, examples, and tools.
It also contains an abstraction interface layer. Clouds can do many things, but there are probably only about 10 of them that most people care about with any regularity. If you want to do complicated things, the per-service oriented portions of the SDK are for you. However, if what you want is to be able to write an application that talks to clouds no matter what crazy choices the deployer has made in an attempt to be more hipster than their self-entitled narcissist peers, then the Cloud Abstraction layer is for you.
openstacksdk started its life as three different libraries: shade, os-client-config and python-openstacksdk.
shade started its life as some code inside of OpenStack Infra's nodepool project, and as some code inside of the Ansible OpenStack Modules. Ansible had a bunch of different OpenStack related modules, and there was a ton of duplicated code. Eventually, between refactoring that duplication into an internal library, and adding the logic and features that the OpenStack Infra team had developed to run client applications at scale, it turned out that we'd written nine-tenths of what we'd need to have a standalone library.
Because of its background from nodepool, shade contained abstractions to work around deployment differences and is resource oriented rather than service oriented. This allows a user to think about Security Groups without having to know whether Security Groups are provided by Nova or Neutron on a given cloud. On the other hand, as an interface that provides an abstraction, it deviates from the published OpenStack REST API and adds its own opinions, which may not get in the way of more advanced users with specific needs.
os-client-config was a library for collecting client configuration for using an OpenStack cloud in a consistent and comprehensive manner, which introduced the
clouds.yaml file for expressing named cloud configurations.
python-openstacksdk was a library that exposed the OpenStack APIs to developers in a consistent and predictable manner.
After a while it became clear that there was value in both the high-level layer that contains additional business logic and the lower-level SDK that exposes services and their resources faithfully and consistently as Python objects.
This led to the merge of the three projects.
The original contents of the shade library have been moved into
openstack.cloud and os-client-config has been moved in to
openstack.config. Future releases of shade will provide a thin compatibility layer that subclasses the objects from
openstack.cloud and provides different argument defaults where needed for compatibility. Similarly future releases of os-client-config will provide a compatibility layer shim around
List servers using objects configured with the
openstack.config will find cloud configuration for as few as 1 clouds and as many as you want to put in a config file. It will read environment variables and config files, and it also contains some vendor specific default values so that you don't have to know extra info to use OpenStack
Sometimes an example is nice.
openstack.config will look for a file called
clouds.yaml in the following locations:
More information at https://docs.openstack.org/openstacksdk/latest/user/config/configuration.html
Create a server using objects configured with the
import openstack.cloud # Initialize and turn on debug logging openstack.enable_logging(debug=True) # Initialize connection # Cloud configs are read with openstack.config 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 for it. conn.create_server( 'my-server', image=image, flavor=flavor, wait=True, auto_ip=True)