Kubernetes：GKE |即使内存利用率大于/等于目标值，HPA也不会扩展Pod

Question

我们有一个GKE集群（1.11），并基于Pod的内存利用率实现了HPA。在我们的测试活动中，我们观察到HPA行为不一致，即使达到目标值，HPA也没有缩放豆荚。我们还注意到，HPA事件并未提供任何响应数据（按比例缩小或按比例缩小相关信息）。

示例

kubectl获得hpa

NAME REFERENCE TARGETS MINPODS MAXPODS REPLICAS AGE

com-manh-cp-organization Deployment/com-manh-cp-organization 95%/90% 1 25 1 1d

kubectl描述hpa com-manh-cp-organization

Name:                                                     com-manh-cp-organization
Namespace:                                                default
Labels:                                                   app=com-manh-cp-organization
                                                          stereotype=REST
Annotations:                                              kubectl.kubernetes.io/last-applied-configuration:
                                                            {"apiVersion":"autoscaling/v2beta1","kind":"HorizontalPodAutoscaler","metadata":{"annotations":{},"labels":{"app":"com-manh-cp-organizatio...
CreationTimestamp:                                        Tue, 12 Feb 2019 18:02:12 +0530
Reference:                                                Deployment/com-manh-cp-organization
Metrics:                                                  ( current / target )
  resource memory on pods  (as a percentage of request):  95% (4122087424) / 90%
Min replicas:                                             1
Max replicas:                                             25
Deployment pods:                                          1 current / 1 desired
Conditions:
  Type            Status  Reason              Message
  ----            ------  ------              -------
  AbleToScale     True    ReadyForNewScale    the last scale time was sufficiently old as to warrant a new scale
  ScalingActive   True    ValidMetricFound    the HPA was able to successfully calculate a replica count from memory resource utilization (percentage of request)
  ScalingLimited  False   DesiredWithinRange  the desired count is within the acceptable range
Events:           <none>

• 集群版本：1.11.6
• 云服务：GKE
• 指标：内存
• Target：targetAverageUtilization

我们将不胜感激任何输入，并告诉我们是否可以调试HPA实施。

谢谢。

Answer 1

按此link.指定的计算副本数时，HPA中阈值的值存在容差

此公差默认为0.1。因此，在您的配置中，放置90％时可能未达到阈值。我建议您将指标更改为80％，然后查看它是否有效。