-`region``(string: "")`– Specifies the name of the region. This can also be provided via the environment variable `OS_REGION_NAME`.
-`tenant_id``(string: "")` - Specifies the id of the tenant. This can also be provided via the environment variable `OS_TENANT_ID`.
-`domain``(string: "")` - Specifies the name of the user domain. This can also be provided via the environment variable `OS_USER_DOMAIN_NAME`.
-`project-domain``(string: "")` - Specifies the name of the project's domain. This can also be provided via the environment variable `OS_PROJECT_DOMAIN_NAME`.
-`trust_id``(string: "")` - Specifies the id of the trust. This can also be provided via the environment variable `OS_TRUST_ID`.
-`storage_url``(string: "")` - Specifies storage URL from alternate authentication. This can also be provided via the environment variable `OS_STORAGE_URL`.
-`auth_token``(string: "")` - Specifies auth token from alternate authentication. This can also be provided via the environment variable `OS_AUTH_TOKEN`.