In order to use the python tacker client directly, you must first obtain an auth token and identify which endpoint you wish to speak to. Once you have done so, you can use the API.
In order to use the CLI, you must provide your OpenStack username, password, tenant, and auth endpoint. Use the corresponding configuration options (``--os-username``, ``--os-password``, ``--os-tenant-name``, and ``--os-auth-url``) or set them in environment variables::
The command line tool will attempt to reauthenticate using your provided credentials for every request. You can override this behavior by manually supplying an auth token using ``--os-url`` and ``--os-auth-token``. You can alternatively set these environment variables::
If tacker server does not require authentication, besides these two arguments or environment variables (We can use any value as token.), we need manually supply ``--os-auth-strategy`` or set the environment variable::