如何在GKE上将k-本机的最小标度设置为1？

Question

我在GKE上的k8s集群上安装了k-本机。现在，我正在使用一个示例HelloWorld应用程序运行一个测试。

由于我在GKE上运行，并且支付集群24/7的费用，所以将部署规模扩大到零没有意义，而且对于第一个请求总是有一个冷启动。

到目前为止我尝试过的东西清单

1. 运行kubectl -n knative-serving edit cm config-autoscaler，然后按照此链接的意思将enable-scale-to-zero标志从“true”更改为“false”
2. Ran kubectl annotate --overwrite svc helloworld-go-5jm9r autoscaling.knative.dev/minScale="1"如此链接中所述
3. 运行kubectl annotate --overwrite svc helloworld-go-5jm9r autoscaling.knative.dev/class-作为我自己的实验之一

不管我做了什么修改，启动用于服务的HelloWorld吊舱都会终止，因为没有更多的呼叫进入。

$ 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

正确地将minScale因子设置为1应该会使吊舱永远存活下去，我错了吗？

人们说设置一个自定义的迷你选项到处都有，但我无法接通。我遗漏了什么？例如，我们欢迎运行的具体命令。

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

注释修订并没有让发射舱存活..。有什么想法吗？

答案：

这是PodAutoscaler，不是服务，也不是修订。

$ 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minScale中的描述在yaml配置文件上设置链接。

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

我认为必须添加注释到Revision对象，但是您正在注释Service对象，这就是为什么它不能工作的原因。

试着列出所有的Revision对象

kubectl get revision

并对您感兴趣的对象进行注释，使用与注释Service相同的命令。