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：

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