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Chapter 12. Configure Quality-of-Service (QoS)

Red Hat OpenStack Platform 8 introduces support for network quality-of-service (QoS) policies. These policies allow OpenStack administrators to offer varying service levels by applying rate limits to egress traffic for instances. As a result of implementing a QoS policy, any traffic that exceeds the specified rate is consequently dropped.

12.1. QoS Policy Scope
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QoS policies are applied to individual ports, or to a particular tenant network, where ports with no specific policy attached will inherit the policy.

12.2. QoS Policy Management
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QoS policies can be dynamically applied, modified, or removed. This example manually creates a bandwidth limiting rule and applies it to a port.

  1. Review the list of tenants and determine the id of where you need to create QoS policy: 

    # keystone tenant-list
+----------------------------------+--------------------+---------+
|                id                |        name        | enabled |
+----------------------------------+--------------------+---------+
| 35c6f4eb8bc24455a1df527760c091f5 |       admin        |   True  |
| d602b03dcc324dd483d37163388b2021 |        demo        |   True  |
| 74b64ba4eb3e4f08a8819454b667d4f6 |      services      |   True  |
+----------------------------------+--------------------+---------+

  2. Create a QoS policy named bw-limiter in the admin tenant: 

    # neutron qos-policy-create --tenant-id 35c6f4eb8bc24455a1df527760c091f5 'bw-limiter'

  3. Configure the policing rules for the bw-limiter policy: 

    # neutron qos-bandwidth-limit-rule-create bw-limiter --max_kbps 3000 --max_burst_kbps 3000

  4. Configure a neutron port to apply the bw-limiter policy: 

    # neutron port-update <port id> --qos-policy bw-limiter

  5. Review the QoS rule. For example: 

    # neutron qos-rule-show 9be535c3-daa2-4d7b-88ea-e8de16

+-------------------+---------------------------------+
| Field             | Value                           |
+-------------------+---------------------------------+
| id                | 9be535c3-daa2-4d7b-88ea-e8de16  |
| rule_type         | bandwidth_limit                 |
| description       |                                 |
| max_kbps          | 3000                            |
| max_burst_kbps    | 300                             |
+-------------------+---------------------------------+

These values allow you to configure the policing algorithm accordingly:

  • max_kbps - the maximum rate (in Kbps) that the instance is allowed to send.
  • max_burst_kbps - the maximum amount of data (in kbits) that the port could send in a instant if the token buffer was full. The token buffer is replenished at a "max_kbps" rate.
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