openstack-manuals/doc/config-reference/source/tables/nova-policy.rst

Description of policy configuration options

Configuration option = Default value	Description
[DEFAULT]
allow_instance_snapshots = True	(Boolean) Operators can turn off the ability for a user to take snapshots of their instances by setting this option to False. When disabled, any attempt to take a snapshot will result in a HTTP 400 response ("Bad Request").
allow_resize_to_same_host = False	(Boolean) Allow destination machine to match source for resize. Useful when testing in single-host environments. By default it is not allowed to resize to the same host. Setting this option to true will add the same host to the destination options.
max_age = 0	(Integer) The number of seconds between subsequent usage refreshes. This defaults to 0 (off) to avoid additional load but it is useful to turn on to help keep quota usage up-to-date and reduce the impact of out of sync usage issues. Note that quotas are not updated on a periodic task, they will update on a new reservation if max_age has passed since the last reservation. Possible values: 0 (default) or any positive integer representing number of seconds.
max_local_block_devices = 3	(Integer) Maximum number of devices that will result in a local image being created on the hypervisor node. A negative number means unlimited. Setting max_local_block_devices to 0 means that any request that attempts to create a local disk will fail. This option is meant to limit the number of local discs (so root local disc that is the result of --image being used, and any other ephemeral and swap disks). 0 does not mean that images will be automatically converted to volumes and boot instances from volumes - it just means that all requests that attempt to create a local disk will fail. Possible values: 0: Creating a local disk is not allowed. Negative number: Allows unlimited number of local discs. Positive number: Allows only these many number of local discs. (Default value is 3).
osapi_compute_unique_server_name_scope =	(String) Sets the scope of the check for unique instance names. The default doesn't check for unique names. If a scope for the name check is set, a launch of a new instance or an update of an existing instance with a duplicate name will result in an ''InstanceExists'' error. The uniqueness is case-insensitive. Setting this option can increase the usability for end users as they don't have to distinguish among instances with the same name by their IDs. Possible values: '': An empty value means that no uniqueness check is done and duplicate names are possible. "project": The instance name check is done only for instances within the same project. "global": The instance name check is done for all instances regardless of the project.
osapi_max_limit = 1000	(Integer) As a query can potentially return many thousands of items, you can limit the maximum number of items in a single response by setting this option.
password_length = 12	(Integer) Length of generated instance admin passwords.
reservation_expire = 86400	(Integer) The number of seconds until a reservation expires. It represents the time period for invalidating quota reservations. Possible values: 86400 (default) or any positive integer representing number of seconds.
resize_fs_using_block_device = False	(Boolean) If enabled, attempt to resize the filesystem by accessing the image over a block device. This is done by the host and may not be necessary if the image contains a recent version of cloud-init. Possible mechanisms require the nbd driver (for qcow and raw), or loop (for raw).
until_refresh = 0	(Integer) The count of reservations until usage is refreshed. This defaults to 0 (off) to avoid additional load but it is useful to turn on to help keep quota usage up-to-date and reduce the impact of out of sync usage issues. Possible values: 0 (default) or any positive integer.