Configuration Guide

The static configuration for nova lives in two main files: nova.conf and policy.yaml. These are described below. For a bigger picture view on configuring nova to solve specific problems, refer to the Nova Admin Guide.


  • Configuration Guide: Detailed configuration guides for various parts of your Nova system. Helpful reference for setting up specific hypervisor backends.

  • Config Reference: A complete reference of all configuration options available in the nova.conf file.


Nova, like most OpenStack projects, uses a policy language to restrict permissions on REST API actions.

  • Policy Concepts: Starting in the Ussuri release, Nova API policy defines new default roles with system scope capabilities. These new changes improve the security level and manageability of Nova API as they are richer in terms of handling access at system and project level token with ‘Read’ and ‘Write’ roles.

  • Policy Reference: A complete reference of all policy points in nova and what they impact.

Extra Specs

Nova uses flavor extra specs as a way to provide additional information to instances beyond basic information like amount of RAM or disk. This information can range from hints for the scheduler to hypervisor-specific configuration instructions for the instance.

  • Extra Spec Reference: A complete reference for all extra specs currently recognized and supported by nova.