main.go

package main

import (
	"flag"
	"fmt"
	"os"
	"path/filepath"
	"time"

	"k8s.io/client-go/tools/clientcmd"
	"k8s.io/client-go/kubernetes"
	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
	"k8s.io/apimachinery/pkg/api/errors"
)

var namespace string
var pod string
func init() {
	flag.StringVar(&pod, "pod", "", "name of pods")
	flag.StringVar(&namespace, "namespace", "default", "name of namespace")
	flag.StringVar(&namespace, "n", "default", "name of namespace")
}

func main() {
	var kubeconfig *string
	if home := homedir(); home != "" {
		kubeconfig = flag.String("kubeconfig", filepath.Join(home, ".kube", "config"), "(optional) absolute path to the kubeconfig file")
	} else {
		kubeconfig = flag.String("kubeconfig", "", "absolute path to the kubeconfig file")
	}
	flag.Parse()

	config, err := clientcmd.BuildConfigFromFlags("", *kubeconfig)
	if err != nil {
		panic(err.Error())
	}

	clientset, err := kubernetes.NewForConfig(config)
	if err != nil {
		panic(err.Error())
	}

	for {
		pods, err := clientset.CoreV1().Pods("").List(metav1.ListOptions{})
		if err != nil {
			panic(err.Error())
		}
		fmt.Printf("there are %d pods in the cluster\n", len(pods.Items))

		_, err = clientset.CoreV1().Pods(namespace).Get(pod, metav1.GetOptions{})
		if errors.IsNotFound(err) {
			fmt.Printf("pod %s in namespace %s not found \n", pod, namespace)
		} else if statusError, isStatus := err.(*errors.StatusError); isStatus {
			fmt.Printf("Error getting pod %s in namepace %s: %v\n",
		               pod, namespace, statusError.ErrStatus.Message)
		} else if err != nil {
			panic(err.Error)
		} else {
			fmt.Printf("Found pod %s in namespace %s\n", pod, namespace)
		}

		time.Sleep(10 * time.Second)
	}
}

func homedir() string {
	if h := os.Getenv("HOME"); h != "" {
		return h
	}
	return os.Getenv("USERPROFILE")
}