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

Red Hat OpenStack Platform 9 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: 

    # openstack project list
+----------------------------------+----------+
| ID                               | Name     |
+----------------------------------+----------+
| 4b0b98f8c6c040f38ba4f7146e8680f5 | auditors |
| 519e6344f82e4c079c8e2eabb690023b | services |
| 80bf5732752a41128e612fe615c886c6 | demo     |
| 98a2f53c20ce4d50a40dac4a38016c69 | admin    |
+----------------------------------+----------+
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  2. Create a QoS policy named bw-limiter in the admin tenant: 

    # neutron qos-policy-create 'bw-limiter' --tenant-id 98a2f53c20ce4d50a40dac4a38016c69
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  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
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  4. Configure a neutron port to apply the bw-limiter policy: 

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

12.3. RBAC for QoS Policies
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Red Hat OpenStack Platform 9 adds Role-based Access Control (RBAC) for QoS policies. As a result, you can now apply QoS policies to certain projects.

For example, you can now create a QoS policy that allows for lower-priority network traffic, and have it only apply to certain projects. In the following command below, the bw-limiter policy created previously is assigned to the demo tenant: 

# neutron rbac-create 'bw-limiter' --type qos-policy --target-tenant 80bf5732752a41128e612fe615c886c6 --action access_as_shared
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