Connect From Config

In order to work with an OpenStack cloud you first need to create a Connection to it using your credentials. A Connection can be created in 3 ways, using the class itself (see Connect), a file, or environment variables as illustrated below. The SDK uses os-client-config to handle the configuration.

Create Connection From A File

Default Location

To create a connection from a file you need a YAML file to contain the configuration.

clouds:
  devstack:
    auth:
      auth_url: http://xxx.xxx.xxx.xxx/identity
      password: password
      project_domain_id: default
      project_name: demo
      user_domain_id: default
      username: demo
    identity_api_version: '3'
    region_name: RegionOne
    volume_api_version: '3'
  devstack-admin:
    auth:
      auth_url: http://xxx.xxx.xxx.xxx/identity
      password: password
      project_domain_id: default
      project_name: admin
      user_domain_id: default
      username: admin
    identity_api_version: '3'
    region_name: RegionOne
    volume_api_version: '3'
  devstack-alt:
    auth:
      auth_url: http://xxx.xxx.xxx.xxx/identity
      password: password
      project_domain_id: default
      project_name: alt_demo
      user_domain_id: default
      username: alt_demo
    identity_api_version: '3'
    region_name: RegionOne
    volume_api_version: '3'
example:
  image_name: cirros-0.5.2-x86_64-disk
  flavor_name: m1.small

To use a configuration file called clouds.yaml in one of the default locations:

• Current Directory

• ~/.config/openstack

• /etc/openstack

call from_config(). The from_config function takes three optional arguments:

• cloud_name allows you to specify a cloud from your clouds.yaml file.

• cloud_config allows you to pass in an existing openstack.config.loader.OpenStackConfig` object.

• options allows you to specify a namespace object with options to be added to the cloud config.

class Opts:
    def __init__(self, cloud_name='devstack-admin', debug=False):
        self.cloud = cloud_name
        self.debug = debug
        # Use identity v3 API for examples.
        self.identity_api_version = '3'

def create_connection_from_config():
    return openstack.connect(cloud=TEST_CLOUD)

def create_connection_from_args():
    parser = argparse.ArgumentParser()
    return openstack.connect(options=parser)

Note

To enable logging, set debug=True in the options object.

User Defined Location

To use a configuration file in a user defined location set the environment variable OS_CLIENT_CONFIG_FILE to the absolute path of a file.:

export OS_CLIENT_CONFIG_FILE=/path/to/my/config/my-clouds.yaml

and call from_config() with the cloud_name of the cloud configuration to use, .

Next

Now that you can create a connection, continue with the User Guides for an OpenStack service.