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"

根据 label 批量删除 pvc:

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

根据 label 批量删除 pv:

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

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/re…



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