使用 kubernetes go 客户端扩展部署副本

Question

我正在尝试使用golang client扩展部署。我发现的问题是golang 客户端没有用于部署的缩放方法。我不知道我该怎么做。我的想法是进行部署，修改副本，然后进行更新。

package main

import (
    "context"
    metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
    appsv1 "k8s.io/api/apps/v1"
    "flag"
    "fmt"
    "os"
    "path/filepath"

)

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)
    }
    //get and update replicas
    deploymentsClient := clientset.AppsV1().Deployments(apiv1.NamespaceDefault)
    deployment, _ := deploymentsClient.Get(context.TODO(), "demo-deployment", metav1.GetOptions{})
    deploymentsClient.Update(context.TODO(), deployment, metav1.UpdateOptions{})
}

（示例取自kubernetes 客户端 go github 存储库）

但我不知道这是否是最好的方法。

Answer 1

package main

import (
    "context"
    "log"
    "path/filepath"

    metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
    "k8s.io/client-go/kubernetes"
    "k8s.io/client-go/rest"
    "k8s.io/client-go/tools/clientcmd"
    "k8s.io/client-go/util/homedir"
)

func main() {
    kubeconfig := filepath.Join(homedir.HomeDir(), ".kube", "config")
    config, err := clientcmd.BuildConfigFromFlags("", kubeconfig)
    if err != nil {
        config, err = rest.InClusterConfig()
        if err != nil {
            log.Fatal(err)
        }
    }

    client, err := kubernetes.NewForConfig(config)
    if err != nil {
        log.Fatal(err)
    }

    s, err := client.AppsV1().
        Deployments("default").
        GetScale(context.TODO(), "nginx", metav1.GetOptions{})
    if err != nil {
        log.Fatal(err)
    }

    sc := *s
    sc.Spec.Replicas = 10

    us, err := client.AppsV1().
        Deployments("default").
        UpdateScale(context.TODO(),
            "nginx", &sc, metav1.UpdateOptions{})
    if err != nil {
        log.Fatal(err)
    }

    log.Println(*us)
}