Kubernetes， active 探测失败，但 Pod 处于运行状态

Question

我正在尝试使用 kubernetes 进行蓝绿色部署，我已遵循它，https://www.ianlewis.org/en/bluegreen-deployments-kubernetes ， 那没问题。
我添加了一个活性探针来执行健康检查，

apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  name: flask-1.3
spec:
  replicas: 2
  template:
    metadata:
      labels:
        name: app
        version: "1.3"
    spec:
      containers: 
        - name: appflask
          image: 192.168.99.100:5000/fapp:1.2
          livenessProbe:
            httpGet:
             path: /index2
             port: 5000
            failureThreshold: 1
            periodSeconds: 1
            initialDelaySeconds: 1
          ports:
            - name: http
              containerPort: 5000

路径“index2”不存在，我想测试一个失败的部署。问题是当我执行:

 kubectl get pods -o wide

几秒钟内，其中一个 pod 处于“正在运行”状态

NAME                         READY   STATUS             RESTARTS   AGE     IP             NODE    NOMINATED NODE   READINESS GATES

flask-1.3-6c644b8648-878qz   0/1     CrashLoopBackOff   6          6m19s   10.244.1.250   node    <none>           <none>
flask-1.3-6c644b8648-t6qhv   0/1     CrashLoopBackOff   7          6m19s   10.244.2.230   nod2e   <none>           <none>

几秒钟后，当 live 总是失败时，一个 pod 正在运行:

NAME                         READY   STATUS             RESTARTS   AGE 

    IP             NODE    NOMINATED NODE   READINESS GATES

   flask-1.3-6c644b8648-878qz   1/1     Running            7          6m20s   10.244.1.250   node    <none>           <none>
    flask-1.3-6c644b8648-t6qhv   0/1     CrashLoopBackOff   7          6m20s   10.244.2.230   nod2e   <none>           <none>

在将它运行回 CrashLoopBackOff 之后，问题是，如果 livenesprobe 总是失败，为什么它会在几秒钟内保持运行？

提前致谢

Answer 1

你应该看看 Readiness probe相反，或两者兼而有之。

Readiness and liveness probes can be used in parallel for the same container. Using both can ensure that traffic does not reach a container that is not ready for it, and that containers are restarted when they fail.

Liveness probe检查您的应用程序是否在您的 中处于健康状态已经在运行 pod .

Readiness probe实际上会检查您的 pod 是否准备好接收流量。因此，如果没有 /index2 端点，它永远不会显示为 运行