Kubernetes HPA 无法扩展

Question

今天这很奇怪，我使用了 AWS EKS 集群，它在昨天和今天早上对我的 HPA 运行良好。从下午开始，什么都没有，我的HPA突然不行了！！

这是我的 HPA：

apiVersion: autoscaling/v2beta2
kind: HorizontalPodAutoscaler
metadata:
  name: my_hpa_name
  namespace: default
spec:
  scaleTargetRef:
    apiVersion: apps/v1
    kind: Deployment
    name: my_deployment_name
  minReplicas: 1
  maxReplicas: 10
  metrics:
    - type: Pods
      pods:
        metric:
          name: my_metrics # MUST match the metrics on custom_metrics API
        target:
          type: AverageValue
          averageValue: 5
  behavior:
    scaleUp:
      stabilizationWindowSeconds: 30 # window to consider waiting while scaling Up. default is 0s if empty.
    scaleDown:
      stabilizationWindowSeconds: 300 # window to consider waiting while scaling down. default is 300s if empty.

而且，当我开始测试时，我尝试了很多次，但都失败了：

NAME                        REFERENCE                                   TARGETS       MINPODS   MAXPODS   REPLICAS   AGE
xxxx-hpa   Deployment/xxxx-deployment   <unknown>/5   1         10        0          5s
xxxx-hpa   Deployment/xxxx-deployment   0/5           1         10        1          16s
xxxx-hpa   Deployment/xxxx-deployment   10/5          1         10        1          3m4s
xxxx-hpa   Deployment/xxxx-deployment   9/5           1         10        1          7m38s
xxxx-hpa   Deployment/xxxx-deployment   10/5          1         10        1          8m9s

可以看到上面的副本一直没有增加！

当我描述我的 HPA 时，它说没有关于放大的事件，但当前值 > 我的目标但从未放大！！！

Name:                         hpa_name
Namespace:                    default
Labels:                       <none>
Annotations:                  kubectl.kubernetes.io/last-applied-configuration:
                                {"apiVersion":"autoscaling/v2beta2","kind":"HorizontalPodAutoscaler","metadata":{"annotations":{},"name":"hpa_name","name...
CreationTimestamp:            Thu, 04 Mar 2021 20:28:40 -0800
Reference:                    Deployment/my_deployment
Metrics:                      ( current / target )
  "plex_queue_size" on pods:  10 / 5
Min replicas:                 1
Max replicas:                 10
Deployment pods:              1 current / 1 desired
Conditions:
  Type            Status  Reason              Message
  ----            ------  ------              -------
  AbleToScale     True    ReadyForNewScale    recommended size matches current size
  ScalingActive   True    ValidMetricFound    the HPA was able to successfully calculate a replica count from pods metric my_metrics
  ScalingLimited  False   DesiredWithinRange  the desired count is within the acceptable range
Events:           <none>

这有什么问题？

会不会是EKS集群出了问题？？？

编辑：

查看官方文档： https://kubernetes.io/docs/tasks/run-application/horizontal-pod-autoscale/#algorithm-details

within a globally-configurable tolerance, from the --horizontal-pod-autoscaler-tolerance flag, which defaults to 0.1 我想即使我的指标是 6/5，它仍然会扩大，因为它大于 1.0

我清楚地看到我的 HPA 之前有效，这是 2 天前它有效的一些证据：

NAME           REFERENCE          TARGETS   MINPODS   MAXPODS   REPLICAS   AGE
my-hpa   Deployment/my-deployment   0/5       1         10        1          26s
my-hpa   Deployment/my-deployment   0/5       1         10        1          46s
my-hpa   Deployment/my-deployment   8/5       1         10        1          6m21s
my-hpa   Deployment/my-deployment   8/5       1         10        2          6m36s
my-hpa   Deployment/my-deployment   8/5       1         10        2          6m52s
my-hpa   Deployment/my-deployment   8/5       1         10        4          7m7s
my-hpa   Deployment/my-deployment   7/5       1         10        4          7m38s
my-hpa   Deployment/my-deployment   6750m/5   1         10        6          7m55s

但是现在，它不起作用了。我已经尝试为其他指标启动新的 HPA，它有效。就这一个。奇怪...

新编辑：由于 EKS 集群，这是可能的，正如我所看到的：

kubectl get nodes
NAME                                           STATUS                     ROLES    AGE   VERSION
ip-172-27-177-146.us-west-2.compute.internal   Ready                      <none>   14h   v1.18.9-eks-d1db3c
ip-172-27-183-31.us-west-2.compute.internal    Ready,SchedulingDisabled   <none>   15h   v1.18.9-eks-d1db3c

SchedulingDisabled 是否意味着群集不足以容纳新的 pods？

Answer 1

想到的一件事是您的 metrics-server might not be running correctly. Without data from the metrics-server，水平 Pod 自动缩放将不起作用。

Answer 2

想通了。这是 EKS 集群问题。我有最多 2 个按需节点和最多 2 个现场节点的资源限制。需要增加集群节点。

Kubernetes HPA 无法扩展

Kubernetes HPA doesn't scale up

kubernetes

autoscaling

amazon-eks

hpa