Kubernetes operator系列：client-go篇

在Kubernetes中，client-go库是一个用于与Kubernetes API服务器交互的Go语言客户端。以下是一个使用client-go创建和删除Pods的简单示例：

package main
 
import (
    "context"
    "flag"
    "fmt"
    "path/filepath"
 
    metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
    "k8s.io/client-go/kubernetes"
    "k8s.io/client-go/tools/clientcmd"
    "k8s.io/client-go/util/homedir"
)
 
func main() {
    var kubeconfig *string
    if home := homedir.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)
    }
 
    clientset, err := kubernetes.NewForConfig(config)
    if err != nil {
        panic(err)
    }
 
    // 创建Pod
    podClient := clientset.CoreV1().Pods("default")
    pod := &v1.Pod{
        ObjectMeta: metav1.ObjectMeta{
            Name: "demo-pod",
        },
        Spec: v1.PodSpec{
            Containers: []v1.Container{
                {
                    Name:  "demo-container",
                    Image: "nginx",
                },
            },
        },
    }
    fmt.Println("Creating pod...")
    _, err = podClient.Create(context.TODO(), pod, metav1.CreateOptions{})
    if err != nil {
        panic(err)
    }
    fmt.Println("Pod created")
 
    // 删除Pod
    fmt.Println("Deleting pod...")
    deletePolicy := metav1.DeletePropagationForeground
    err = podClient.Delete(context.TODO(), "demo-pod", metav1.DeleteOptions{
        PropagationPolicy: &deletePolicy,
    })
    if err != nil {
        panic(err)
    }
    fmt.Println("Pod deleted")
}

这段代码首先解析kubeconfig文件的路径，然后使用提供的配置信息创建一个Kubernetes客户端。接下来，它展示了如何创建一个简单的Pod和如何删除它。这是一个基本的例子，展示了如何使用client-go库与Kubernetes集群交互。