OpenStack Zed修改浮动IP其他属性致QoS策略丢失是否为BUG？

这是一个BUG，正常情况下修改浮动IP的非QoS相关属性（如description）不应该清除已关联的QoS策略ID。

问题重现步骤 #

1. 查看浮动IP当前的QoS策略ID：

openstack floating ip show 75c41f3f-ea12-4555-947e-7a4803147c0a |grep qos
| qos_policy_id       | 60e612d2-fa01-421a-a4cd-96043c3c7587                                                                                                                                 |

2. 通过PUT API仅修改description属性：

curl -X PUT -H "X-Auth-Token: $token" http://10.0.52.1:9696/v2.0/floatingips/75c41f3f-ea12-4555-947e-7a4803147c0a -d '{"floatingip": {"description": "testing"}}' 

返回结果显示qos_policy_id已被设为null：

{"floatingip": {"id": "75c41f3f-ea12-4555-947e-7a4803147c0a", "tenant_id": "c13998dac04045a5acb4464bf2274272", "floating_ip_address": "10.0.56.130", "floating_network_id": "46f94d26-b0b0-49f4-b1e6-d67b5189c018", "router_id": "037c542b-82a1-449a-ac3f-8c29b1f49344", "port_id": "a805c597-0ac7-48fa-bde9-f727beeb5b0e", "fixed_ip_address": "192.168.50.14", "status": "ACTIVE", "description": "testing", "qos_policy_id": null, "port_details": {"name": "test", "network_id": "c2ebde5e-8766-4d4e-9517-f95fd6fd3ec7", "mac_address": "fa:16:3e:7c:fd:c4", "admin_state_up": true, "status": "DOWN", "device_id": "", "device_owner": ""}, "port_forwardings": [], "tags": ["flow_model"], "created_at": "2023-07-04T10:21:20Z", "updated_at": "2023-07-07T06:01:29Z", "revision_number": 262, "project_id": "c13998dac04045a5acb4464bf2274272"}}

3. 再次查看浮动IP的QoS策略ID，确认已被清空：

openstack floating ip show 75c41f3f-ea12-4555-947e-7a4803147c0a |grep qos
| qos_policy_id       | None 

问题原因 #

Neutron服务在处理浮动IP的PUT请求时，未对请求体中未指定的字段做保留处理，而是默认将qos_policy_id设为null，违背了"仅修改指定属性"的预期行为。

临时解决办法 #

• 方法1：PUT请求时附带当前QoS策略ID
  在修改其他属性时，将当前的qos_policy_id一并放入请求体，避免被重置：

  curl -X PUT -H "X-Auth-Token: $token" http://10.0.52.1:9696/v2.0/floatingips/75c41f3f-ea12-4555-947e-7a4803147c0a -d '{"floatingip": {"description": "testing", "qos_policy_id": "60e612d2-fa01-421a-a4cd-96043c3c7587"}}'
  

• 方法2：改用PATCH请求做部分更新
  PATCH请求是REST规范中用于部分资源更新的标准方式，只会修改指定字段，不会影响其他未提及的属性：

  curl -X PATCH -H "X-Auth-Token: $token" http://10.0.52.1:9696/v2.0/floatingips/75c41f3f-ea12-4555-947e-7a4803147c0a -d '{"floatingip": {"description": "testing"}}'
  

内容的提问来源于stack exchange，提问作者alex