Understanding OpenSDN quotas¶

Overview: OpenSDN quotas¶

Quotas are used to prevent system capacities from being exhausted without notification. Quotas are operational limits.

Quotas are currently enforced at the tenant (or project) level. OpenSDN support quotas for the next resources:

Quota could be set on a project with WebUI and through the VNC API.

WebUI uses a VNC API to set and get project quota settings. To get a current quota usage/limits WebUI counting list of resource

objects for each resource type what could be slow with a large amount of resources.

To get and configure quotas open Configure -> Infrastructure -> Project Settings -> Quotas (opened by default)

Openstack (tf-neutron-plugin) uses a VNC API to set and get project quota settings. To get a current quota usage/limits

tf-neutron-plugin counting list of resource objects for each resource what could be slow with a large amount of resources.

Action	Command
List default project quotas	`openstack quota show --default <proj_uuid>`
List quota and quota usage	`openstack quota list --project <uuid> --network --detail`
Set project quota	`openstack quota set <uuid> --<type>=<value>`

For each resource per a project, OpenSDN stores quota counter in Zookeeper. When user tries to create a new resource with

applied limits current quota usage will be verified and 412 error will be raised in case of OverQuota. New resource will be

created if quota is verified. Quota rolled back if resource creation failed with any other reasons.

The following command could help to check quotas in Zookeeper.

Action \| Command
Connect to ZK \| `bin/zkCli.sh -server <zk_ip>:<zk_port\|2181>`
Get quota usage (counter		`get /vnc_api_server_obj_create/<proj_uuid>/<reource_name>`
List resources with a quota counter		`ls /vnc_api_server_obj_create/<proj_uuid>`