5.2. nova Optional Arguments

--version: show program's version number and exit
--debug: Print debugging output.
--os-cache: Use the auth token cache. Defaults to False if
env[OS_CACHE] is not set.
--timings: Print call timing info.
--os-region-name <region-name>: Defaults to env[OS_REGION_NAME].
--service-type <service-type>: Defaults to compute for most actions.
--service-name <service-name>: Defaults to env[NOVA_SERVICE_NAME].
--os-endpoint-type <endpoint-type>: Defaults to env[NOVA_ENDPOINT_TYPE],
env[OS_ENDPOINT_TYPE] or publicURL.
--os-compute-api-version <compute-api-ver>:       Accepts X, X.Y (where X is major and Y is
      minor part) or "X.latest", defaults to
      env[OS_COMPUTE_API_VERSION].
--bypass-url <bypass-url>:         Use this API endpoint instead of the Service
      Catalog. Defaults to
      env[NOVACLIENT_BYPASS_URL].
--os-auth-type <name>, --os-auth-plugin <name>: Authentication type to use