Question

我正在尝试找到一种方法来确定“ kubectl port-forward”命令的状态。有一种方法可以确定Pod，节点的就绪状态：例如“ kubectl get pods”等...

是否可以确定kubectl port-forward命令是否已完成并准备工作？

谢谢。

Answer 1

Readiness and liveness probes是集群检查单个Pod状态的方式。

您需要在清单中定义它们：

apiVersion: v1
kind: Pod
metadata:
  name: goproxy
  labels:
    app: goproxy
spec:
  containers:
  - name: goproxy
    image: k8s.gcr.io/goproxy:0.1
    ports:
    - containerPort: 8080
    readinessProbe:
      tcpSocket:
        port: 8080
      initialDelaySeconds: 5
      periodSeconds: 10
    livenessProbe:
      tcpSocket:
        port: 8080
      initialDelaySeconds: 15
      periodSeconds: 20

当您的吊舱开始运作时，kubectl port-forward将立即工作。

您可以在以下位置阅读一些理论

https://kubernetes.io/docs/tasks/configure-pod-container/configure-liveness-readiness-probes/

Answer 2

直接回答您的问题-不，您无法确定kubectl port-forward命令的状态。确定后台运行情况的唯一方法是检查此命令的输出。输出将类似于：

Forwarding from 127.0.0.1:6379 -> 6379
Forwarding from [::1]:6379 -> 6379

我可能建议使用service type NodePort而不是port-forward。使用NodePort，您可以将应用程序公开为服务，并可以从Kubernetes外部进行访问。有关更多示例，use this url。

Answer 3

I have the same understanding as you @VKR.

The way that I choose to solve this was to have a loop with a curl every second to check the status of the forwarded port. It works but I had hoped for a prebaked solution to this.

do curl:6379
timer=0
while curl is false and timer <100
  timer++
  curl:6379
  sleep 1

Thank you @Nicola and @David, I will keep those in mind when I get past development testing.

确定Kubernetes端口转发状态的状态

3 个答案: