API Configuration

updated: 2024-06-21 07:19

API Configuration

Rate limiting

Warning

This is legacy functionality that is poorly tested and may be removed in the future. You may wish to enforce rate limiting through a proxy server instead.

Cinder supports admin-configured API limits. These are disabled by default but can be configured by modifying api-paste.ini to enabled the RateLimitingMiddleware middleware. For example, given the following composite application definitions in e.g. /etc/cinder/api-paste.ini:

[composite:openstack_volume_api_v2]
use = call:cinder.api.middleware.auth:pipeline_factory
noauth = cors ... apiv2
keystone = cors ... apiv2
keystone_nolimit = cors ... apiv2

[composite:openstack_volume_api_v3]
use = call:cinder.api.middleware.auth:pipeline_factory
noauth = cors ... apiv3
keystone = cors ... apiv3
keystone_nolimit = cors ... apiv3

You can configure rate limiting by adding a new filter to call RateLimitingMiddleware and configure the composite applications to use this filter:

[composite:openstack_volume_api_v2]
use = call:cinder.api.middleware.auth:pipeline_factory
noauth = cors ... ratelimit apiv2
keystone = cors ... ratelimit apiv2
keystone_nolimit = cors ... ratelimit apiv2

[composite:openstack_volume_api_v3]
use = call:cinder.api.middleware.auth:pipeline_factory
noauth = cors ... ratelimit apiv3
keystone = cors ... ratelimit apiv3
keystone_nolimit = cors ... ratelimit apiv3

[filter:ratelimit]
paste.filter_factory = cinder.api.v2.limits:RateLimitingMiddleware.factory

Once configured, restart the cinder-api service. Users can then view API limits using the openstack limits show --rate command. For example:

$ openstack limits show --rate
+--------+-----------------+-------+--------+--------+---------------------+
| Verb   | URI             | Value | Remain | Unit   | Next Available      |
+--------+-----------------+-------+--------+--------+---------------------+
| POST   | *               |    10 |     10 | MINUTE | 2021-03-23T12:36:09 |
| PUT    | *               |    10 |     10 | MINUTE | 2021-03-23T12:36:09 |
| DELETE | *               |   100 |    100 | MINUTE | 2021-03-23T12:36:09 |
| POST   | */servers       |    50 |     50 | DAY    | 2021-03-23T12:36:09 |
| GET    | *changes-since* |     3 |      3 | MINUTE | 2021-03-23T12:36:09 |
+--------+-----------------+-------+--------+--------+---------------------+

Note

Rate limits are entirely separate from absolute limits, which track resource utilization and can be seen using the openstack limits show --absolute command.

updated: 2024-06-21 07:19
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