go - 如何在运行时从 Go 代码获取 pod 外部 IP

Question

非常简单的问题，我怎样才能获得运行我当前 go 代码的 Pod？

我需要它，因为出于某种原因，我需要直接 ping Pod 的代码，而不是使用我的常规端点(负载均衡器)。

我当前的配置:

apiVersion: v1
kind: Service
metadata:
  name: web-socket-service-api
spec:
  ports:
    # Port that accepts gRPC and JSON/HTTP2 requests over HTTP.
    - port: 8080
      targetPort: 8080
      protocol: TCP
      name: grpc
    # Port that accepts gRPC and JSON/HTTP2 requests over HTTP.
    - port: 8081
      targetPort: 8081
      protocol: TCP
      name: rest
    # Port that accepts WebSockets.
    - port: 8082
      targetPort: 8082
      protocol: TCP
      name: websocket
  selector:
    app: web-socket-service-api
  type: LoadBalancer
---
apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  name: web-socket-service-api
spec:
  replicas: 3
  template:
    metadata:
      labels:
        app: web-socket-service-api
    spec:
      containers:
        - name: web-socket-service-api
          image: gcr.io/[PROJECT]/web-socket-service-api:latest
          ports:
            - containerPort: 8080
            - containerPort: 8081
            - containerPort: 8082

我试过了

/*
    metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
    "k8s.io/client-go/kubernetes"
    "k8s.io/client-go/rest"
*/

func GetContainerIP() string {

    // creates the in-cluster config
    config, err := rest.InClusterConfig()
    if err != nil {
        panic(err.Error())
    }
    // creates the clientset
    clientset, err := kubernetes.NewForConfig(config)
    if err != nil {
        panic(err.Error())
    }

    log.Println("checking pods")
    pods, err := clientset.CoreV1().Pods("default").List(metav1.ListOptions{})
    if err != nil {
        panic(err.Error())
    }
    b, _ := json.Marshal(pods)
    log.Println(string(b))

    for _, pod := range pods.Items {
        log.Println(pod.Name, pod.Status)
        pod, err := clientset.CoreV1().Pods("default").Get(pod.Name, metav1.GetOptions{})
        if err != nil {
            panic(err.Error())
        }
        log.Println(pod.Status)
    }
    log.Println("checked pods")

    return ""
}

但我很遗憾

panic: pods is forbidden: User "system:serviceaccount:default:default" cannot list resource "pods" in API group "" in the namespace "default"

而且我找不到修复它的方法或任何关于它的教程..

Answer 1

片刻后我找到了答案，但完全忘了把它贴在这里!

Please note that it will crash if you ain't in a Kubernetes env

import (
    metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
    "k8s.io/client-go/kubernetes"
    "k8s.io/client-go/rest"
    "os"
    "os/signal"
    "time"
)

//
// Pod infos
//

func GetPodDetails() (IP string, name string) {

    // creates the in-cluster config
    config, err := rest.InClusterConfig()
    if err != nil {
        panic(err.Error())
    }
    // creates the clientset
    clientset, err := kubernetes.NewForConfig(config)
    if err != nil {
        panic(err.Error())
    }

    IP = ""
    for {
        if IP != "" {
            break
        } else {
            log.Printf("No IP for now.\n")
        }

        pods, err := clientset.CoreV1().Pods("default").List(metav1.ListOptions{})
        if err != nil {
            panic(err.Error())
        }
        for _, pod := range pods.Items {
            pod, _ := clientset.CoreV1().Pods("default").Get(pod.Name, metav1.GetOptions{})
            if pod.Name == os.Getenv("HOSTNAME") {
                IP = pod.Status.PodIP
            }
        }

        log.Printf("Waits...\n")
        time.Sleep(1 * time.Second)
    }

    name = os.Getenv("HOSTNAME")
    log.Printf("Trying os.Getenv(\"HOSTNAME/IP\"): [%s][%s]\n", name, IP)

    return IP, name
}