如何批量删除k8s资源对象

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进击云原生 2021-07-08 14:35:55 ©著作权

文章标签 k8s 文章分类 云计算

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kubernetes版本：1.13.2

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"

如何批量删除k8s资源对象_k8s

根据label批量删除pvc：

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

如何批量删除k8s资源对象_k8s_02

根据label批量删除pv：

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

如何批量删除k8s资源对象_k8s_03

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