如何批量删除k8s资源对象

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在云平台开发、中间件容器化时，经常会遇到批量删除k8s资源对象的需求，下面记录一下kubectl和golang发送删除pvc、pv、pod请求的例子，便于后续学习查阅

kubectl发送删除请求

根据label批量删除pod：

kubectl delete pod -n kube-system -l "harmonycloud.cn/statefulset=redis-ll-1010-a"

(/img/2019-10-10-batch-delet-k8s-resources/batch-delete-pods.png)]

根据label批量删除pvc：

kubectl delete pvc -n kube-system -l "harmonycloud.cn/statefulset=redis-ll-1010-a"

(/img/2019-10-10-batch-delet-k8s-resources/batch-delete-pvcs.png)]

根据label批量删除pv：

kubectl delete pv -l "harmonycloud.cn/statefulset=redis-ll-1010-a"

(/img/2019-10-10-batch-delet-k8s-resources/batch-delete-pvs.png)]

golang发送删除请求

根据label批量删除pvc、pod、pv

注意：启动参数中加入以下参数：

--kubeconfig=/root/.kube/config --v=5

package operator

import (
    "flag"
    extensionsclient "k8s.io/apiextensions-apiserver/pkg/client/clientset/clientset"
    "k8s.io/apimachinery/pkg/api/errors"
    metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
    "k8s.io/apimachinery/pkg/labels"
    "k8s.io/apiserver/pkg/util/logs"
    clientset "k8s.io/client-go/kubernetes"
    restclient "k8s.io/client-go/rest"
    "k8s.io/client-go/tools/clientcmd"
    "k8s.io/klog"
    "os"
    "testing"
)

type OperatorManagerServer struct {
    Master     string
    Kubeconfig string
}

func NewOMServer() *OperatorManagerServer {
    s := OperatorManagerServer{}
    return &s
}

var s *OperatorManagerServer

func init() {

    s = NewOMServer()
    flag.StringVar(&s.Master, "master", s.Master, "The address of the Kubernetes API server (overrides any value in kubeconfig)")
    flag.StringVar(&s.Kubeconfig, "kubeconfig", s.Kubeconfig, "Path to kubeconfig file with authorization and master location information.")
    //初始化klog等flag
    logs.InitLogs()
    flag.Parse()
}

func Test_DeleteCollection(t *testing.T) {
    if err := Run(s); err != nil {
        t.Fatalf("%v\n", err)
        os.Exit(1)
    }
}

func Run(s *OperatorManagerServer) error {

    var (
        generalLabelKey       = "harmonycloud.cn/statefulset"
        redisClusterName      = "redis-ll-1010"
        redisClusterNamespace = "kube-system"
    )

    kubeClient, _, _, err := createClients(s)

    if err != nil {
        return err
    }

    //根据label批量删除pod
    labelPod := labels.SelectorFromSet(labels.Set(map[string]string{generalLabelKey: redisClusterName}))
    listPodOptions := metav1.ListOptions{
        LabelSelector: labelPod.String(),
    }
    err = kubeClient.CoreV1().Pods(redisClusterNamespace).DeleteCollection(&metav1.DeleteOptions{}, listPodOptions)
    if err != nil {
        if !errors.IsNotFound(err) {
            klog.Errorf("Drop RedisCluster: %v/%v pod error: %v", redisClusterNamespace, redisClusterName, err)
            return err
        }
    }

    //根据label批量删除pvc
    labelPvc := labels.SelectorFromSet(labels.Set(map[string]string{"app": redisClusterName}))
    listPvcOptions := metav1.ListOptions{
        LabelSelector: labelPvc.String(),
    }
    err = kubeClient.CoreV1().PersistentVolumeClaims(redisClusterNamespace).DeleteCollection(&metav1.DeleteOptions{}, listPvcOptions)
    if err != nil {
        if !errors.IsNotFound(err) {
            klog.Errorf("Drop RedisCluster: %v/%v pvc error: %v", redisClusterNamespace, redisClusterName, err)
            return err
        }
    }

    //如果pv没有删除掉,则删除
    labelPv := labels.SelectorFromSet(labels.Set(map[string]string{generalLabelKey: redisClusterName}))
    listPvOptions := metav1.ListOptions{
        LabelSelector: labelPv.String(),
    }
    err = kubeClient.CoreV1().PersistentVolumes().DeleteCollection(&metav1.DeleteOptions{}, listPvOptions)

    if err != nil {
        if !errors.IsNotFound(err) {
            klog.Errorf("Drop RedisCluster: %v/%v pv error: %v", redisClusterNamespace, redisClusterName, err)
            return err
        }
    }

    return nil
}

//根据kubeconfig文件创建客户端
func createClients(s *OperatorManagerServer) (*clientset.Clientset, *extensionsclient.Clientset, *restclient.Config, error) {
    kubeconfig, err := clientcmd.BuildConfigFromFlags(s.Master, s.Kubeconfig)
    if err != nil {
        return nil, nil, nil, err
    }

    kubeconfig.QPS = 100
    kubeconfig.Burst = 100

    kubeClient, err := clientset.NewForConfig(restclient.AddUserAgent(kubeconfig, "operator-manager"))
    if err != nil {
        klog.Fatalf("Invalid API configuration: %v", err)
    }

    extensionClient, err := extensionsclient.NewForConfig(restclient.AddUserAgent(kubeconfig, "operator-manager"))
    if err != nil {
        klog.Fatalf("Invalid API configuration: %v", err)
    }

    return kubeClient, extensionClient, kubeconfig, nil
}

client-go中提供的

• Delete方法,只能删除单个资源对象,第一个参数往往是资源对象名称,第二个参数是删除选项，如：优雅终止时间GracePeriodSeconds、删除传播策略：Foreground前台删除、后台删除：Background、孤儿删除：Orphan

• DeleteCollection方法第一个参数是删除选项，第二个参数是删除条件，包括label Selector、field Selector等

Delete(name string, options *metav1.DeleteOptions) error
DeleteCollection(options *metav1.DeleteOptions, listOptions metav1.ListOptions) error

参考

k8s官方API文档：

https://kubernetes.io/docs/reference/generated/kubernetes-api/v1.10/#delete-collection-524

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