Question

我在GKE的k8s集群上安装了k-native。现在，我正在使用a sample HelloWorld app进行测试。

由于我在GKE上运行并为24/7集群付费，因此将部署规模扩展到零并始终对第一个请求始终保持冷启动是没有意义的。

到目前为止我已经尝试过的列表

运行kubectl -n knative-serving edit cm config-autoscaler，然后根据this link的含义，将enable-scale-to-zero标志从“ true”更改为“ false”
按照this link的规定kubectl annotate --overwrite svc helloworld-go-5jm9r autoscaling.knative.dev/minScale="1"
将kubectl annotate --overwrite svc helloworld-go-5jm9r autoscaling.knative.dev/class-作为我自己的实验之一

无论我进行了什么修改，启动投放服务的HelloWorld吊舱都终止了，因为没有更多的电话打进来。

$ kubectl get po --watch NAME READY STATUS RESTARTS AGE helloworld-go-5jm9r-deployment-847d6fdb49-njktv 2/2 Running 0 13s helloworld-go-5jm9r-deployment-847d6fdb49-njktv 2/2 Terminating 0 96s helloworld-go-5jm9r-deployment-847d6fdb49-njktv 1/2 Terminating 0 99s helloworld-go-5jm9r-deployment-847d6fdb49-njktv 0/2 Terminating 0 118s

将minScale因子正确设置为1应该可以使Pod永远活着，对吗？

人们说setting-a-custom-minScale选项在这里和那里都可用，但是我无法打开它。我想念什么？例如，欢迎运行具体命令。

第二次尝试：

$ kubectl annotate --overwrite revision helloworld-go-5jm9r autoscaling.knative.dev/minScale="1"
revision.serving.knative.dev/helloworld-go-5jm9r annotated

$ kubectl describe revision
Name:         helloworld-go-5jm9r
Namespace:    default
Labels:       serving.knative.dev/configuration=helloworld-go
              serving.knative.dev/configurationGeneration=1
              serving.knative.dev/service=helloworld-go
Annotations:  autoscaling.knative.dev/minScale: 1
              serving.knative.dev/lastPinned: 1560488757
(..omit..)

$ kubectl get po --watch
NAME                                              READY   STATUS    RESTARTS   AGE
helloworld-go-5jm9r-deployment-65dd4cc9d4-4hhrw   2/2     Running   0          19s
helloworld-go-5jm9r-deployment-65dd4cc9d4-4hhrw   2/2   Terminating   0     98s
helloworld-go-5jm9r-deployment-65dd4cc9d4-4hhrw   1/2   Terminating   0     101s
helloworld-go-5jm9r-deployment-65dd4cc9d4-4hhrw   0/2   Terminating   0     2m

注释修订并不能使启动的pod保持活动状态...知道吗？

答案：

它是PodAutoscaler，不是服务或修订版本。

$ kubectl annotate --overwrite PodAutoscaler helloworld-go-5jm9r autoscaling.knative.dev/minScale="2"
podautoscaler.autoscaling.internal.knative.dev/helloworld-go-5jm9r annotated

$ kubectl describe  PodAutoscaler
Name:         helloworld-go-5jm9r
Namespace:    default
Labels:       app=helloworld-go-5jm9r
              serving.knative.dev/configuration=helloworld-go
              serving.knative.dev/configurationGeneration=1
              serving.knative.dev/revision=helloworld-go-5jm9r
              serving.knative.dev/revisionUID=706b4f42-8be6-11e9-a475-42010a920158
              serving.knative.dev/service=helloworld-go
Annotations:  autoscaling.knative.dev/class: kpa.autoscaling.knative.dev
              autoscaling.knative.dev/metric: concurrency
              autoscaling.knative.dev/minScale: 2
(..omit..)

$ kubectl get po --watch
NAME                                              READY   STATUS              RESTARTS   AGE
helloworld-go-5jm9r-deployment-65dd4cc9d4-6rtr9   0/2     ContainerCreating   0          2s
helloworld-go-5jm9r-deployment-65dd4cc9d4-pqvcz   2/2     Running             0          116s
helloworld-go-5jm9r-deployment-65dd4cc9d4-6rtr9   1/2   Running   0     4s
helloworld-go-5jm9r-deployment-65dd4cc9d4-6rtr9   2/2   Running   0     4s

Answer 1

注释必须添加到PodAutoscaler对象中。

kubectl annotate --overwrite PodAutoscaler helloworld-go-5jm9r autoscaling.knative.dev/minScale="2"

或者您可以按照the link

中的说明在yaml配置文件上设置minScale

apiVersion: serving.knative.dev/v1alpha1 # Current version of Knative
kind: Service
metadata:
  name: helloworld-min2 # The name of the app
  namespace: default # The namespace the app will use
spec:
  template:
    spec:
      containers:
        - image: gcr.io/knative-samples/helloworld-go # The URL to the image of the app
          env:
            - name: TARGET # The environment variable printed out by the sample app
              value: "Go Jin v1"
    metadata:
      annotations:
        autoscaling.knative.dev/minScale: "2"

Answer 2

I think the annotation has to be added到Revision对象，但是您正在注释Service对象，这就是为什么它不起作用的原因。

尝试列出所有Revision个对象

kubectl get revision

并使用与注释Service相同的命令来注释您感兴趣的那个。

如何在GKE上将k-native的最小标度设置为1？

2 个答案: