├── Makefile ├── .gitignore ├── cmd ├── kubectl-sdrain.go └── sdrain │ └── sdrain.go ├── pkg └── sdrain │ ├── recreate.go │ ├── sdrain.go │ ├── wait.go │ └── filters.go ├── go.mod ├── README-zh-CN.md ├── krew.yaml ├── README.md ├── .github └── workflows │ └── go.yml ├── LICENSE └── go.sum /Makefile: -------------------------------------------------------------------------------- 1 | VERSION="0.0.1-preview1" 2 | build: 3 | ./build.sh ${VERSION} -------------------------------------------------------------------------------- /.gitignore: -------------------------------------------------------------------------------- 1 | # Binaries for programs and plugins 2 | *.exe 3 | *.exe~ 4 | *.dll 5 | *.so 6 | *.dylib 7 | 8 | # Test binary, build with `go test -c` 9 | *.test 10 | 11 | # Output of the go coverage tool, specifically when used with LiteIDE 12 | *.out 13 | 14 | .idea 15 | .DS_Store -------------------------------------------------------------------------------- /cmd/kubectl-sdrain.go: -------------------------------------------------------------------------------- 1 | package main 2 | 3 | import ( 4 | "kubectl-sdrain/cmd/sdrain" 5 | "os" 6 | 7 | cmdutil "k8s.io/kubectl/pkg/cmd/util" 8 | 9 | "github.com/spf13/pflag" 10 | "k8s.io/cli-runtime/pkg/genericclioptions" 11 | ) 12 | 13 | func main() { 14 | flags := pflag.NewFlagSet("kubectl-safe-drain", pflag.ExitOnError) 15 | pflag.CommandLine = flags 16 | 17 | cf := genericclioptions.NewConfigFlags(true) 18 | matchVersionKubeConfigFlags := cmdutil.NewMatchVersionFlags(cf) 19 | f := cmdutil.NewFactory(matchVersionKubeConfigFlags) 20 | 21 | root := sdrain.NewCmdSafeDrain(f, genericclioptions.IOStreams{In: os.Stdin, Out: os.Stdout, ErrOut: os.Stderr}) 22 | if err := root.Execute(); err != nil { 23 | os.Exit(1) 24 | } 25 | } 26 | -------------------------------------------------------------------------------- /pkg/sdrain/recreate.go: -------------------------------------------------------------------------------- 1 | package sdrain 2 | 3 | import ( 4 | "fmt" 5 | "time" 6 | 7 | "k8s.io/apimachinery/pkg/types" 8 | ) 9 | 10 | func (d *Helper) reCreateController(controller podController) error { 11 | switch controller.Kind { 12 | case "Deployment": 13 | return d.reCreateDeployment(controller.Namespace, controller.Name) 14 | case "StatefulSet": 15 | return d.reCreateStatefulSet(controller.Namespace, controller.Name) 16 | } 17 | 18 | // todo: not support 19 | return nil 20 | } 21 | 22 | func (d *Helper) reCreate(resource, namespace, controllerName string, body []byte) error { 23 | restClient := d.Client.AppsV1().RESTClient() 24 | return restClient.Patch(types.MergePatchType). 25 | Resource(resource). 26 | Namespace(namespace). 27 | Name(controllerName). 28 | Body(body). 29 | Do(). 30 | Error() 31 | } 32 | 33 | func (d *Helper) reCreateDeployment(namespace, controllerName string) error { 34 | return d.reCreate("deployments", namespace, controllerName, []byte(fmt.Sprintf(`{ 35 | "spec": { 36 | "template": { 37 | "metadata": { 38 | "annotations": { 39 | "fleet.io/safe-drain": "%d" 40 | } 41 | } 42 | } 43 | } 44 | }`, time.Now().Unix()))) 45 | } 46 | 47 | func (d *Helper) reCreateStatefulSet(namespace, controllerName string) error { 48 | return d.reCreate("statefulsets", namespace, controllerName, []byte(fmt.Sprintf(`{ 49 | "spec": { 50 | "template": { 51 | "metadata": { 52 | "annotations": { 53 | "fleet.io/safe-drain": "%d" 54 | } 55 | } 56 | } 57 | } 58 | }`, time.Now().Unix()))) 59 | } 60 | -------------------------------------------------------------------------------- /go.mod: -------------------------------------------------------------------------------- 1 | module kubectl-sdrain 2 | 3 | go 1.23.5 4 | 5 | require ( 6 | github.com/spf13/cobra v0.0.5 7 | github.com/spf13/pflag v1.0.5 8 | k8s.io/api v0.17.0 9 | k8s.io/apimachinery v0.17.0 10 | k8s.io/cli-runtime v0.17.0 11 | k8s.io/client-go v0.17.0 12 | k8s.io/kubectl v0.17.0 13 | ) 14 | 15 | require ( 16 | github.com/Azure/go-ansiterm v0.0.0-20170929234023-d6e3b3328b78 // indirect 17 | github.com/MakeNowJust/heredoc v0.0.0-20170808103936-bb23615498cd // indirect 18 | github.com/PuerkitoBio/purell v1.1.1 // indirect 19 | github.com/PuerkitoBio/urlesc v0.0.0-20170810143723-de5bf2ad4578 // indirect 20 | github.com/chai2010/gettext-go v0.0.0-20160711120539-c6fed771bfd5 // indirect 21 | github.com/davecgh/go-spew v1.1.1 // indirect 22 | github.com/docker/docker v0.7.3-0.20190327010347-be7ac8be2ae0 // indirect 23 | github.com/docker/spdystream v0.0.0-20160310174837-449fdfce4d96 // indirect 24 | github.com/emicklei/go-restful v2.9.5+incompatible // indirect 25 | github.com/evanphx/json-patch v4.2.0+incompatible // indirect 26 | github.com/exponent-io/jsonpath v0.0.0-20151013193312-d6023ce2651d // indirect 27 | github.com/ghodss/yaml v1.0.0 // indirect 28 | github.com/go-openapi/jsonpointer v0.19.3 // indirect 29 | github.com/go-openapi/jsonreference v0.19.3 // indirect 30 | github.com/go-openapi/spec v0.19.3 // indirect 31 | github.com/go-openapi/swag v0.19.5 // indirect 32 | github.com/gogo/protobuf v1.2.2-0.20190723190241-65acae22fc9d // indirect 33 | github.com/golang/protobuf v1.3.2 // indirect 34 | github.com/google/btree v1.0.0 // indirect 35 | github.com/google/gofuzz v1.0.0 // indirect 36 | github.com/googleapis/gnostic v0.0.0-20170729233727-0c5108395e2d // indirect 37 | github.com/gregjones/httpcache v0.0.0-20180305231024-9cad4c3443a7 // indirect 38 | github.com/imdario/mergo v0.3.5 // indirect 39 | github.com/inconshreveable/mousetrap v1.0.0 // indirect 40 | github.com/json-iterator/go v1.1.8 // indirect 41 | github.com/konsorten/go-windows-terminal-sequences v1.0.1 // indirect 42 | github.com/liggitt/tabwriter v0.0.0-20181228230101-89fcab3d43de // indirect 43 | github.com/mailru/easyjson v0.7.0 // indirect 44 | github.com/mitchellh/go-wordwrap v1.0.0 // indirect 45 | github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect 46 | github.com/modern-go/reflect2 v1.0.1 // indirect 47 | github.com/peterbourgon/diskv v2.0.1+incompatible // indirect 48 | github.com/pkg/errors v0.8.1 // indirect 49 | github.com/russross/blackfriday v1.5.2 // indirect 50 | github.com/sirupsen/logrus v1.4.2 // indirect 51 | golang.org/x/crypto v0.0.0-20190820162420-60c769a6c586 // indirect 52 | golang.org/x/net v0.0.0-20191004110552-13f9640d40b9 // indirect 53 | golang.org/x/oauth2 v0.0.0-20190604053449-0f29369cfe45 // indirect 54 | golang.org/x/sys v0.29.0 // indirect 55 | golang.org/x/text v0.3.2 // indirect 56 | golang.org/x/time v0.0.0-20190308202827-9d24e82272b4 // indirect 57 | google.golang.org/appengine v1.5.0 // indirect 58 | gopkg.in/inf.v0 v0.9.1 // indirect 59 | gopkg.in/yaml.v2 v2.2.4 // indirect 60 | k8s.io/component-base v0.17.0 // indirect 61 | k8s.io/klog v1.0.0 // indirect 62 | k8s.io/kube-openapi v0.0.0-20191107075043-30be4d16710a // indirect 63 | k8s.io/utils v0.0.0-20191114184206-e782cd3c129f // indirect 64 | sigs.k8s.io/kustomize v2.0.3+incompatible // indirect 65 | sigs.k8s.io/yaml v1.1.0 // indirect 66 | ) 67 | -------------------------------------------------------------------------------- /README-zh-CN.md: -------------------------------------------------------------------------------- 1 | # kubectl-safe-drain 2 | 一个 kubectl 插件, 用于更为安全的排空节点。 3 | 对于 Deployment 和 StatefulSet 资源会根据其配置的更新策略先将Pod调度到其它可用节点。 4 | 5 | # 为什么需要 6 | 当我们要进行 K8S 节点维护时往往需要执行 `kubectl drain`, 等待节点上的 Pod 被驱逐后再进行维护动作。 7 | 8 | 但 `drain` 动作有一个问题, 他不会考虑资源所定义的 UpdateStrategy, 而直接强制驱逐或删除 Pod, 这样就会导致 Deployment 或 StatefulSet 资源的 Pod 达不到所设置的策略数. 9 | 10 | ## 思考一个案例 11 | 1. 有一个 Deployment 资源, 它使用了如下配置 12 | ```yaml 13 | replicas: 2 14 | strategy: 15 | rollingUpdate: 16 | maxSurge: 1 17 | maxUnavailable: 0 18 | type: RollingUpdate 19 | ``` 20 | 副本数为 3, 采用了滚动更新, 并且先启动完成一个 Pod 后再进行旧 Pod 的删除(最大不可用为0,最小可用为2). 21 | 2. 当下集群有 2 个 worker 节点 22 | 意味着, 其中一个节点被调度了 2 个 Pod, 其中一个节点被调度了 1 个 Pod. 23 | 假设 node1 运行着 pod1 和 pod3, node2 运行着 pod2. 24 | 3. 这时候 drain node1, 会出现 Deployment 只有一个 Pod 可用 25 | 26 | ## 更糟糕的情况 27 | Deployment 的 Pod 全部运行在需要维护的节点上, 这时候执行 `drain` 那将是一个灾难, 这个 Deployment 在新的Pod启动之前它无法在对外提供服务了, 恢复的时间取决于新 Pod 的启动速度。 28 | 29 | ## 与 PDB (Pod Disruption Budget) 有什么区别? 30 | PDB 只会保障 Pod 不被驱逐, 而不会帮助它在其它可用节点上重建。 31 | 使用了 PDB 后能防止服务不可用的尴尬情况，但它还是需要人工手动迁移 Pod。 32 | 33 | **理想的情况是 PDB 需要使用, 防止严苛情况下服务不可用的问题。** 34 | 35 | # 逻辑和原理 36 | 1. 先将需要排空的节点标记为不可调度 (kubectl cordon) 37 | 2. 在找到该节点上的 Deployment 和 StatefulSet 资源 38 | 3. 修改 Deployment 和 StatefulSet 的 PodTemplate, 让K8S根据对应的更新策略重新部署Pod, 这时候需要排空的节点不可被调度, 从而达到先将排空节点中的Pod安全重建到其它节点的逻辑。 39 | 40 | # 目前支持安全迁移的资源 41 | 1. Deployment 42 | 2. StatefulSet 43 | 44 | # 效果 45 | ## 首先我们有一个 Deployment 配置如下 46 | ```yaml 47 | spec: 48 | replicas: 2 49 | strategy: 50 | type: RollingUpdate 51 | rollingUpdate: 52 | maxSurge: 1 53 | maxUnavailable: 0 54 | ``` 55 | 操作前有两个可用 Pod 56 | ![](https://cdn.jsdelivr.net/gh/majian159/blogs@master/images/2020_04_29_19_42_iaR3Cs%20.jpg) 57 | ![](https://cdn.jsdelivr.net/gh/majian159/blogs@master/images/2020_04_29_19_42_Nb8NZA%20.png) 58 | ## 执行 `safe-drain` 59 | ![](https://cdn.jsdelivr.net/gh/majian159/blogs@master/images/2020_04_29_19_43_xc2Jhz%20.png) 60 | 61 | ## 查看 Deployment 变化过程 62 | ![](https://cdn.jsdelivr.net/gh/majian159/blogs@master/images/2020_04_29_19_43_lmDtYv%20.png) 63 | 64 | ## 查看 Pod 变化过程 65 | ![](https://cdn.jsdelivr.net/gh/majian159/blogs@master/images/2020_04_29_19_43_Nd6lPE%20.png) 66 | 67 | ## 流程简述 68 | 从 Deployment watch 的信息中可见最小 Ready 数没有小于 2, 从 Pod watch 的信息中可见 kind-worker2 上承载了 2 个准备就绪的 nginx Pod, 也就是说 nginx 从 kind-worker 安全的移动到了 kind-worker2 节点上。 69 | 70 | # 安装 71 | ## 二进制文件 72 | ### Linux 73 | ```shell script 74 | curl -sLo sdrain.tgz https://github.com/majian159/kubectl-safe-drain/releases/download/v0.0.1-preview1/kubectl-safe-drain_0.0.1-preview1_linux_amd64.tar.gz \ 75 | && tar xf sdrain.tgz \ 76 | && rm -f sdrain.tgz \ 77 | && mv kubectl-safe-drain /usr/local/bin/kubectl-safe_drain 78 | ``` 79 | ### macOS 80 | ```shell script 81 | curl -sLo sdrain.tgz https://github.com/majian159/kubectl-safe-drain/releases/download/v0.0.1-preview1/kubectl-safe-drain_0.0.1-preview1_darwin_amd64.tar.gz \ 82 | && tar xf sdrain.tgz \ 83 | && rm -f sdrain.tgz \ 84 | && mv kubectl-safe-drain /usr/local/bin/kubectl-safe_drain 85 | ``` 86 | ### Windows 87 | https://github.com/majian159/kubectl-safe-drain/releases/download/v0.0.1-preview1/kubectl-safe-drain_0.0.1-preview1_windows_amd64.tar.gz 88 | 89 | ## 基于 Krew 90 | ```shell script 91 | curl -O https://raw.githubusercontent.com/majian159/kubectl-safe-drain/master/krew.yaml \ 92 | && kubectl krew install --manifest=krew.yaml \ 93 | && rm -f krew.yaml 94 | ``` 95 | 96 | # 使用 97 | ```sh 98 | kubectl safe-drain NODE 99 | 100 | # safe-drain并没有调用 drain命令, 而是利用了 SchedulingDisabled 机制 101 | # 所以如有需要可以继续使用 drain 命令来确保节点被驱逐 102 | kubectl drain NODE 103 | ``` 104 | 105 | # TODO 106 | 1. 考虑节点亲和力和节点选择器的情况 107 | 2. 输出更为友好的提示信息 108 | -------------------------------------------------------------------------------- /pkg/sdrain/sdrain.go: -------------------------------------------------------------------------------- 1 | package sdrain 2 | 3 | import ( 4 | "context" 5 | "fmt" 6 | "io" 7 | "math" 8 | "time" 9 | 10 | apierrors "k8s.io/apimachinery/pkg/api/errors" 11 | 12 | corev1 "k8s.io/api/core/v1" 13 | metav1 "k8s.io/apimachinery/pkg/apis/meta/v1" 14 | "k8s.io/apimachinery/pkg/fields" 15 | "k8s.io/client-go/kubernetes" 16 | ) 17 | 18 | type Helper struct { 19 | Client kubernetes.Interface 20 | Force bool 21 | Timeout time.Duration 22 | DeleteLocalData bool 23 | Selector string 24 | Out io.Writer 25 | ErrOut io.Writer 26 | 27 | DryRun bool 28 | } 29 | 30 | // Get pods for nodeName 31 | func (d *Helper) GetPodsForDeletion(nodeName string) (*podDeleteList, []error) { 32 | podList, err := d.Client.CoreV1().Pods(metav1.NamespaceAll).List(metav1.ListOptions{ 33 | FieldSelector: fields.SelectorFromSet(fields.Set{"spec.nodeName": nodeName}).String()}) 34 | if err != nil { 35 | return nil, []error{err} 36 | } 37 | 38 | var pods []podDelete 39 | 40 | for _, pod := range podList.Items { 41 | var status podDeleteStatus 42 | for _, filter := range d.makeFilters() { 43 | status = filter(pod) 44 | if !status.delete { 45 | // short-circuit as soon as pod is filtered out 46 | // at that point, there is no reason to run pod 47 | // through any additional filters 48 | break 49 | } 50 | } 51 | if status.delete { 52 | pods = append(pods, d.newPodDelete(pod, status)) 53 | } 54 | } 55 | 56 | list := &podDeleteList{items: pods} 57 | 58 | return list, nil 59 | } 60 | 61 | func (d *Helper) newPodDelete(pod corev1.Pod, status podDeleteStatus) podDelete { 62 | controllerRef := metav1.GetControllerOf(&pod) 63 | var pc *podController 64 | if controllerRef != nil { 65 | pc = &podController{ 66 | Kind: controllerRef.Kind, 67 | Namespace: pod.Namespace, 68 | Name: controllerRef.Name, 69 | } 70 | pc, _ = d.getController(*pc) 71 | } 72 | 73 | return podDelete{ 74 | pod: pod, 75 | status: status, 76 | controller: pc, 77 | } 78 | } 79 | 80 | func (d *Helper) getController(controller podController) (*podController, error) { 81 | if controller.Kind != "ReplicaSet" { 82 | return &controller, nil 83 | } 84 | 85 | rs, err := d.Client.AppsV1().ReplicaSets(controller.Namespace).Get(controller.Name, metav1.GetOptions{}) 86 | if err != nil { 87 | return nil, err 88 | } 89 | 90 | ref := metav1.GetControllerOf(rs) 91 | 92 | return &podController{ 93 | Kind: ref.Kind, 94 | Namespace: controller.Namespace, 95 | Name: ref.Name, 96 | }, nil 97 | } 98 | 99 | // Migrate pods to other node 100 | func (d *Helper) MigratePods(list *podDeleteList) error { 101 | items := list.items 102 | if len(items) == 0 { 103 | return nil 104 | } 105 | 106 | controllerMap := make(map[string]bool) 107 | var controllers []podController 108 | 109 | for _, item := range items { 110 | controller := item.controller 111 | controllerKey := fmt.Sprintf("%s_%s", controller.Kind, controller.Name) 112 | if controllerMap[controllerKey] { 113 | continue 114 | } 115 | 116 | controllers = append(controllers, *item.controller) 117 | controllerMap[controllerKey] = true 118 | } 119 | 120 | return d.reCreateControllers(controllers, list.Pods()) 121 | } 122 | 123 | func (d *Helper) reCreateControllers(controllers []podController, pods []corev1.Pod) error { 124 | // 0 timeout means infinite, we use MaxInt64 to represent it. 125 | var globalTimeout time.Duration 126 | if d.Timeout == 0 { 127 | globalTimeout = time.Duration(math.MaxInt64) 128 | } else { 129 | globalTimeout = d.Timeout 130 | } 131 | 132 | for _, controller := range controllers { 133 | err := d.reCreateController(controller) 134 | if err != nil && !apierrors.IsNotFound(err) { 135 | return err 136 | } 137 | } 138 | 139 | ctx := context.TODO() 140 | 141 | return d.waitMigrate(ctx, time.Second, d.Timeout, controllers, pods, func(controller *podController) { 142 | fmt.Fprint(d.Out, fmt.Sprintf("%s %s/%s pod migrated\n", controller.Kind, controller.Namespace, controller.Name)) 143 | }, globalTimeout) 144 | } 145 | -------------------------------------------------------------------------------- /pkg/sdrain/wait.go: -------------------------------------------------------------------------------- 1 | package sdrain 2 | 3 | import ( 4 | "context" 5 | "encoding/json" 6 | "fmt" 7 | "time" 8 | 9 | metav1 "k8s.io/apimachinery/pkg/apis/meta/v1" 10 | "k8s.io/client-go/rest" 11 | 12 | corev1 "k8s.io/api/core/v1" 13 | apierrors "k8s.io/apimachinery/pkg/api/errors" 14 | "k8s.io/apimachinery/pkg/util/wait" 15 | ) 16 | 17 | func (d *Helper) waitMigrate(ctx context.Context, interval, timeout time.Duration, controllers []podController, pods []corev1.Pod, onDoneFn func(controller *podController), globalTimeout time.Duration) error { 18 | // TODO(justinsb): unnecessary? 19 | getPodFn := func(namespace, name string) (*corev1.Pod, error) { 20 | return d.Client.CoreV1().Pods(namespace).Get(name, metav1.GetOptions{}) 21 | } 22 | _, err := waitForDelete(ctx, pods, interval, timeout, getPodFn, func(pod *corev1.Pod) { 23 | fmt.Fprint(d.Out, fmt.Sprintf("pod %s/%s at %s removed\n", pod.Namespace, pod.Name, pod.Spec.NodeName)) 24 | }, globalTimeout) 25 | if err != nil { 26 | return err 27 | } 28 | 29 | err = d.waitForReCreate(ctx, interval, timeout, controllers, onDoneFn, globalTimeout) 30 | if err != nil { 31 | return err 32 | } 33 | 34 | return nil 35 | } 36 | 37 | func (d *Helper) waitForReCreate(ctx context.Context, interval, timeout time.Duration, controllers []podController, onDoneFn func(controller *podController), globalTimeout time.Duration) error { 38 | var controllerTasks = make(map[podController]bool) 39 | for _, controller := range controllers { 40 | controllerTasks[controller] = false 41 | } 42 | err := wait.PollImmediate(interval, timeout, func() (bool, error) { 43 | for controller, complete := range controllerTasks { 44 | if complete { 45 | continue 46 | } 47 | instance, err := getControllerInstance(d.Client.AppsV1().RESTClient(), controller.Kind+"s", controller.Namespace, controller.Name) 48 | if err != nil { 49 | return false, err 50 | } 51 | status := instance.Status 52 | if status.ReadyReplicas == status.Replicas { 53 | controllerTasks[controller] = true 54 | if onDoneFn != nil { 55 | onDoneFn(&controller) 56 | } 57 | } 58 | } 59 | 60 | allComplete := true 61 | for _, complete := range controllerTasks { 62 | if !complete { 63 | allComplete = false 64 | break 65 | } 66 | } 67 | if !allComplete { 68 | select { 69 | case <-ctx.Done(): 70 | return false, fmt.Errorf("global timeout reached: %v", globalTimeout) 71 | default: 72 | return false, nil 73 | } 74 | return false, nil 75 | } 76 | return true, nil 77 | }) 78 | return err 79 | } 80 | 81 | func waitForDelete(ctx context.Context, pods []corev1.Pod, interval, timeout time.Duration, getPodFn func(string, string) (*corev1.Pod, error), onDoneFn func(pod *corev1.Pod), globalTimeout time.Duration) ([]corev1.Pod, error) { 82 | err := wait.PollImmediate(interval, timeout, func() (bool, error) { 83 | pendingPods := []corev1.Pod{} 84 | for i, pod := range pods { 85 | p, err := getPodFn(pod.Namespace, pod.Name) 86 | if apierrors.IsNotFound(err) || (p != nil && p.ObjectMeta.UID != pod.ObjectMeta.UID) { 87 | if onDoneFn != nil { 88 | onDoneFn(&pod) 89 | } 90 | continue 91 | } else if err != nil { 92 | return false, err 93 | } else { 94 | pendingPods = append(pendingPods, pods[i]) 95 | } 96 | } 97 | pods = pendingPods 98 | if len(pendingPods) > 0 { 99 | select { 100 | case <-ctx.Done(): 101 | return false, fmt.Errorf("global timeout reached: %v", globalTimeout) 102 | default: 103 | return false, nil 104 | } 105 | return false, nil 106 | } 107 | return true, nil 108 | }) 109 | return pods, err 110 | } 111 | 112 | type controllerInstance struct { 113 | Status controllerStatus 114 | } 115 | type controllerStatus struct { 116 | Replicas int 117 | ReadyReplicas int 118 | } 119 | 120 | func getControllerInstance(client rest.Interface, resource, namespace, name string) (*controllerInstance, error) { 121 | data, err := client.Get().Resource(resource).Namespace(namespace).Name(name).DoRaw() 122 | if err != nil { 123 | return nil, err 124 | } 125 | 126 | var instance controllerInstance 127 | err = json.Unmarshal(data, &instance) 128 | if err != nil { 129 | return nil, err 130 | } 131 | return &instance, nil 132 | 133 | } 134 | -------------------------------------------------------------------------------- /krew.yaml: -------------------------------------------------------------------------------- 1 | apiVersion: krew.googlecontainertools.github.com/v1alpha2 2 | kind: Plugin 3 | metadata: 4 | name: safe-drain 5 | spec: 6 | version: "v0.0.1" 7 | homepage: https://github.com/majian159/kubectl-safe-drain 8 | shortDescription: "Safe drain node." 9 | description: | 10 | Safe drain node, complete the eviction of Pod according to the update strategy. 11 | platforms: 12 | - selector: 13 | matchLabels: 14 | os: darwin 15 | arch: arm64 16 | uri: https://github.com/majian159/kubectl-safe-drain/releases/download/v0.0.1-preview2/kubectl-safe-drain_0.0.1-preview2_darwin_arm64.tar.gz 17 | sha256: f9e974d69b6a595973ef448b7ba1e51686ac8c051c5d94ce0ebc1d943602d689 18 | bin: ./kubectl-safe-drain 19 | - selector: 20 | matchLabels: 21 | os: darwin 22 | arch: amd64 23 | uri: https://github.com/majian159/kubectl-safe-drain/releases/download/v0.0.1-preview2/kubectl-safe-drain_0.0.1-preview2_darwin_amd64.tar.gz 24 | sha256: 5831ff66784841aeb4d3274d9a241262b33e064b89e1b0f545c754d9da074029 25 | bin: ./kubectl-safe-drain 26 | - selector: 27 | matchLabels: 28 | os: linux 29 | arch: amd64 30 | uri: https://github.com/majian159/kubectl-safe-drain/releases/download/v0.0.1-preview2/kubectl-safe-drain_0.0.1-preview2_linux_arm64.tar.gz 31 | sha256: 230b22faa433ffa57e8d1a9d5a8646ce51d9d1c88bdb8a50091c2989219163de 32 | bin: ./kubectl-safe-drain 33 | - selector: 34 | matchLabels: 35 | os: linux 36 | arch: amd64 37 | uri: https://github.com/majian159/kubectl-safe-drain/releases/download/v0.0.1-preview2/kubectl-safe-drain_0.0.1-preview2_linux_amd64.tar.gz 38 | sha256: d40211c8fad1071d44e11440e345a21cf4779847b033fe4f9392eacd13cf4a00 39 | bin: ./kubectl-safe-drain 40 | - selector: 41 | matchLabels: 42 | os: linux 43 | arch: amd64 44 | uri: https://github.com/majian159/kubectl-safe-drain/releases/download/v0.0.1-preview2/kubectl-safe-drain_0.0.1-preview2_linux_386.tar.gz 45 | sha256: 9a0e9332911cbb67ec1503e3505d55d2ea2df196eb5cf7ed9ba65edb82451472 46 | bin: ./kubectl-safe-drain 47 | - selector: 48 | matchLabels: 49 | os: windows 50 | arch: amd64 51 | uri: https://github.com/majian159/kubectl-safe-drain/releases/download/v0.0.1-preview2/kubectl-safe-drain_0.0.1-preview2_windows_arm64.tar.gz 52 | sha256: 49c97c399cbbe1a87acd1176bfc1dea0076d4354e3e0eea48e4a0cbdaf6ac4e4 53 | bin: ./kubectl-safe-drain.exe 54 | - selector: 55 | matchLabels: 56 | os: windows 57 | arch: amd64 58 | uri: https://github.com/majian159/kubectl-safe-drain/releases/download/v0.0.1-preview2/kubectl-safe-drain_0.0.1-preview2_windows_amd64.tar.gz 59 | sha256: 0a4005b48980cc03f2cf741dbf9a157fa4144ec85cf6c3f08c35251a1a5f20dc 60 | bin: ./kubectl-safe-drain.exe 61 | - selector: 62 | matchLabels: 63 | os: windows 64 | arch: amd64 65 | uri: https://github.com/majian159/kubectl-safe-drain/releases/download/v0.0.1-preview2/kubectl-safe-drain_0.0.1-preview2_windows_386.tar.gz 66 | sha256: e48bdd5676ec9e7a0a23c7c3ba94aa19f1fad3c70088b0d6a8b984c0a9b15dd0 67 | bin: ./kubectl-safe-drain.exe 68 | - selector: 69 | matchLabels: 70 | os: freebsd 71 | arch: arm64 72 | uri: https://github.com/majian159/kubectl-safe-drain/releases/download/v0.0.1-preview2/kubectl-safe-drain_0.0.1-preview2_freebsd_arm64.tar.gz 73 | sha256: 386e08c9971a9e52968f10257c949f18b94b088e2a99e711ed43e9aaef9c38fb 74 | bin: ./kubectl-safe-drain 75 | - selector: 76 | matchLabels: 77 | os: freebsd 78 | arch: arm64 79 | uri: https://github.com/majian159/kubectl-safe-drain/releases/download/v0.0.1-preview2/kubectl-safe-drain_0.0.1-preview2_freebsd_amd64.tar.gz 80 | sha256: 0d4e728f2e42aad80b1eedfbad8651301386555447345c5d60c47d4dd6ed59f6 81 | bin: ./kubectl-safe-drain 82 | - selector: 83 | matchLabels: 84 | os: freebsd 85 | arch: arm64 86 | uri: https://github.com/majian159/kubectl-safe-drain/releases/download/v0.0.1-preview2/kubectl-safe-drain_0.0.1-preview2_freebsd_386.tar.gz 87 | sha256: 5cbbb631e7f96583fac70101cf689ca61fdcf458aca3b525ccac56b967376aef 88 | bin: ./kubectl-safe-drain -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # Kubectl-Safe-Drain 2 | A kubectl plug-in, according to the update strategy, safe drain node and dispatch pod to other available nodes. 3 | 4 | # Summary / [中文介绍](https://github.com/majian159/kubectl-safe-drain/blob/master/README-zh-CN.md "中文介绍") 5 | 6 | # Why the Needed 7 | You can use kubectl drain to safely evict all of your pods from a node before you perform maintenance on the node (e.g. kernel upgrade, hardware maintenance, etc.). Safe evictions allow the pod’s containers to gracefully terminate and will respect the PodDisruptionBudgets you have specified. 8 | 9 | But kubectl drain has a problem , that it forces the pod to be evicted or delete, instead of the update strategy defined by the resource such as replicas strategy . 10 | 11 | # An example 12 | There is a deployment resource : 13 | ```yml 14 | replicas: 2 15 | strategy: 16 | rollingUpdate: 17 | maxSurge: 1 18 | maxUnavailable: 0 19 | type: RollingUpdate 20 | ``` 21 | 22 | The number of resource copies is 3, and rolling update is adopted. One pod is started before deleting the old pod (the maximum unavailable is 0, and the minimum available is 2) 23 | 24 | At present, there are two worker nodes in the cluster, one of which is scheduled with two pod, the other is scheduled with one pod. 25 | 26 | Suppose node1 is running POD1 and POD3, and the node2 is running POD2. 27 | 28 | At this time,kubectl drain NODE1 will show that there is only one pod available for deployment. 29 | 30 | # Worse, it's all on the nodes that need to be maintained 31 | It will be a disaster to execute drain at this time. Before the new pod starts, the deployment cannot provide external services. The recovery time depends on the startup speed of the new pod. 32 | 33 | # What's the difference with Pod Disruption Budget? 34 | Pod Disruption Budget will only protect pod from being evicted, and will not help it rebuild on other available nodes. 35 | 36 | It prevents service unavailability, but it still requires manual migration of pod 37 | 38 | # The principle of kubectl safe drain 39 | * Mark nodes as non schedulable (kubectl cordon). 40 | * Locate the deployment and statefullset resources on this node. 41 | * Modify Pod Template and save that rebuild to other nodes. 42 | 43 | # Support safe migration of resources 44 | 1. Deployment 45 | 2. StatefulSet 46 | 47 | # Demo 48 | Deployment: 49 | ```yml 50 | spec: 51 | replicas: 2 52 | strategy: 53 | type: RollingUpdate 54 | rollingUpdate: 55 | maxSurge: 1 56 | maxUnavailable: 0 57 | ``` 58 | 59 | 60 | 61 | 62 | 63 | 64 | 65 | ## Has two pods 66 | ![](https://cdn.jsdelivr.net/gh/majian159/blogs@master/images/2020_04_29_19_42_iaR3Cs%20.jpg) 67 | ![](https://cdn.jsdelivr.net/gh/majian159/blogs@master/images/2020_04_29_19_42_Nb8NZA%20.png) 68 | 69 | ## Execute safe-drain 70 | 71 | ![](https://cdn.jsdelivr.net/gh/majian159/blogs@master/images/2020_04_29_19_43_xc2Jhz%20.png) 72 | 73 | ## View deployment changes 74 | ![](https://cdn.jsdelivr.net/gh/majian159/blogs@master/images/2020_04_29_19_43_lmDtYv%20.png) 75 | 76 | ## View pod changes 77 | ![](https://cdn.jsdelivr.net/gh/majian159/blogs@master/images/2020_04_29_19_43_Nd6lPE%20.png) 78 | 79 | 80 | # Install 81 | ## Linux Binary 82 | ```shell script 83 | curl -sLo sdrain.tgz https://github.com/majian159/kubectl-safe-drain/releases/download/v0.0.1-preview1/kubectl-safe-drain_0.0.1-preview1_linux_amd64.tar.gz \ 84 | && tar xf sdrain.tgz \ 85 | && rm -f sdrain.tgz \ 86 | && mv kubectl-safe-drain /usr/local/bin/kubectl-safe_drain 87 | ``` 88 | ## MacOS Binary 89 | ```shell script 90 | curl -sLo sdrain.tgz https://github.com/majian159/kubectl-safe-drain/releases/download/v0.0.1-preview1/kubectl-safe-drain_0.0.1-preview1_darwin_amd64.tar.gz \ 91 | && tar xf sdrain.tgz \ 92 | && rm -f sdrain.tgz \ 93 | && mv kubectl-safe-drain /usr/local/bin/kubectl-safe_drain 94 | ``` 95 | ## Windows Binary 96 | https://github.com/majian159/kubectl-safe-drain/releases/download/v0.0.1-preview1/kubectl-safe-drain_0.0.1-preview1_windows_amd64.tar.gz 97 | 98 | ## Krew Install 99 | ```shell script 100 | curl -O https://raw.githubusercontent.com/majian159/kubectl-safe-drain/master/krew.yaml \ 101 | && kubectl krew install --manifest=krew.yaml \ 102 | && rm -f krew.yaml 103 | ``` 104 | 105 | # How to use 106 | ```sh 107 | kubectl safe-drain NODE 108 | ``` 109 | 110 | # TODO 111 | 112 | * Node selector , such as annotationsֵ or labels of Kubernetes-Pod 113 | * Output more friendly prompt information 114 | 115 | 116 | 117 | 118 | 119 | 120 | 121 | 122 | 123 | -------------------------------------------------------------------------------- /pkg/sdrain/filters.go: -------------------------------------------------------------------------------- 1 | package sdrain 2 | 3 | import ( 4 | "fmt" 5 | "strings" 6 | 7 | appsv1 "k8s.io/api/apps/v1" 8 | corev1 "k8s.io/api/core/v1" 9 | apierrors "k8s.io/apimachinery/pkg/api/errors" 10 | metav1 "k8s.io/apimachinery/pkg/apis/meta/v1" 11 | ) 12 | 13 | const ( 14 | daemonSetFatal = "DaemonSet-managed Pods (use --ignore-daemonsets to ignore)" 15 | daemonSetWarning = "ignoring DaemonSet-managed Pods" 16 | localStorageFatal = "Pods with local storage (use --delete-local-data to override)" 17 | localStorageWarning = "deleting Pods with local storage" 18 | unmanagedFatal = "Pods not managed by ReplicationController, ReplicaSet, Job, DaemonSet or StatefulSet (use --force to override)" 19 | unmanagedWarning = "deleting Pods not managed by ReplicationController, ReplicaSet, Job, DaemonSet or StatefulSet" 20 | ) 21 | 22 | type podDelete struct { 23 | pod corev1.Pod 24 | status podDeleteStatus 25 | controller *podController 26 | } 27 | 28 | type podDeleteList struct { 29 | items []podDelete 30 | } 31 | 32 | type podDeleteStatus struct { 33 | delete bool 34 | reason string 35 | message string 36 | } 37 | 38 | // Takes a pod and returns a PodDeleteStatus 39 | type podFilter func(corev1.Pod) podDeleteStatus 40 | 41 | const ( 42 | podDeleteStatusTypeOkay = "Okay" 43 | podDeleteStatusTypeSkip = "Skip" 44 | podDeleteStatusTypeWarning = "Warning" 45 | podDeleteStatusTypeError = "Error" 46 | ) 47 | 48 | type podController struct { 49 | Kind string 50 | Namespace string 51 | Name string 52 | } 53 | 54 | func (l *podDeleteList) Pods() []corev1.Pod { 55 | pods := []corev1.Pod{} 56 | for _, i := range l.items { 57 | if i.status.delete { 58 | pods = append(pods, i.pod) 59 | } 60 | } 61 | return pods 62 | } 63 | 64 | func (l *podDeleteList) Warnings() string { 65 | ps := make(map[string][]string) 66 | for _, i := range l.items { 67 | if i.status.reason == podDeleteStatusTypeWarning { 68 | ps[i.status.message] = append(ps[i.status.message], fmt.Sprintf("%s/%s", i.pod.Namespace, i.pod.Name)) 69 | } 70 | } 71 | 72 | msgs := []string{} 73 | for key, pods := range ps { 74 | msgs = append(msgs, fmt.Sprintf("%s: %s", key, strings.Join(pods, ", "))) 75 | } 76 | return strings.Join(msgs, "; ") 77 | } 78 | 79 | func (l *podDeleteList) errors() []error { 80 | failedPods := make(map[string][]string) 81 | for _, i := range l.items { 82 | if i.status.reason == podDeleteStatusTypeError { 83 | msg := i.status.message 84 | if msg == "" { 85 | msg = "unexpected error" 86 | } 87 | failedPods[msg] = append(failedPods[msg], fmt.Sprintf("%s/%s", i.pod.Namespace, i.pod.Name)) 88 | } 89 | } 90 | errs := make([]error, 0) 91 | for msg, pods := range failedPods { 92 | errs = append(errs, fmt.Errorf("cannot delete %s: %s", msg, strings.Join(pods, ", "))) 93 | } 94 | return errs 95 | } 96 | 97 | func makePodDeleteStatusOkay() podDeleteStatus { 98 | return podDeleteStatus{ 99 | delete: true, 100 | reason: podDeleteStatusTypeOkay, 101 | } 102 | } 103 | 104 | func makePodDeleteStatusSkip() podDeleteStatus { 105 | return podDeleteStatus{ 106 | delete: false, 107 | reason: podDeleteStatusTypeSkip, 108 | } 109 | } 110 | 111 | func makePodDeleteStatusWithWarning(delete bool, message string) podDeleteStatus { 112 | return podDeleteStatus{ 113 | delete: delete, 114 | reason: podDeleteStatusTypeWarning, 115 | message: message, 116 | } 117 | } 118 | 119 | func makePodDeleteStatusWithError(message string) podDeleteStatus { 120 | return podDeleteStatus{ 121 | delete: false, 122 | reason: podDeleteStatusTypeError, 123 | message: message, 124 | } 125 | } 126 | 127 | func (d *Helper) makeFilters() []podFilter { 128 | return []podFilter{ 129 | d.daemonSetFilter, 130 | d.mirrorPodFilter, 131 | d.localStorageFilter, 132 | d.unreplicatedFilter, 133 | } 134 | } 135 | 136 | func hasLocalStorage(pod corev1.Pod) bool { 137 | for _, volume := range pod.Spec.Volumes { 138 | if volume.EmptyDir != nil { 139 | return true 140 | } 141 | } 142 | 143 | return false 144 | } 145 | 146 | func (d *Helper) daemonSetFilter(pod corev1.Pod) podDeleteStatus { 147 | // Note that we return false in cases where the pod is DaemonSet managed, 148 | // regardless of flags. 149 | // 150 | // The exception is for pods that are orphaned (the referencing 151 | // management resource - including DaemonSet - is not found). 152 | // Such pods will be deleted if --force is used. 153 | controllerRef := metav1.GetControllerOf(&pod) 154 | if controllerRef == nil || controllerRef.Kind != appsv1.SchemeGroupVersion.WithKind("DaemonSet").Kind { 155 | return makePodDeleteStatusOkay() 156 | } 157 | // Any finished pod can be removed. 158 | if pod.Status.Phase == corev1.PodSucceeded || pod.Status.Phase == corev1.PodFailed { 159 | return makePodDeleteStatusOkay() 160 | } 161 | 162 | if _, err := d.Client.AppsV1().DaemonSets(pod.Namespace).Get(controllerRef.Name, metav1.GetOptions{}); err != nil { 163 | // remove orphaned pods with a warning if --force is used 164 | if apierrors.IsNotFound(err) && d.Force { 165 | return makePodDeleteStatusWithWarning(true, err.Error()) 166 | } 167 | 168 | return makePodDeleteStatusWithError(err.Error()) 169 | } 170 | 171 | return makePodDeleteStatusWithWarning(false, daemonSetWarning) 172 | } 173 | 174 | func (d *Helper) mirrorPodFilter(pod corev1.Pod) podDeleteStatus { 175 | if _, found := pod.ObjectMeta.Annotations[corev1.MirrorPodAnnotationKey]; found { 176 | return makePodDeleteStatusSkip() 177 | } 178 | return makePodDeleteStatusOkay() 179 | } 180 | 181 | func (d *Helper) localStorageFilter(pod corev1.Pod) podDeleteStatus { 182 | if !hasLocalStorage(pod) { 183 | return makePodDeleteStatusOkay() 184 | } 185 | // Any finished pod can be removed. 186 | if pod.Status.Phase == corev1.PodSucceeded || pod.Status.Phase == corev1.PodFailed { 187 | return makePodDeleteStatusOkay() 188 | } 189 | if !d.DeleteLocalData { 190 | return makePodDeleteStatusWithError(localStorageFatal) 191 | } 192 | 193 | return makePodDeleteStatusWithWarning(true, localStorageWarning) 194 | } 195 | 196 | func (d *Helper) unreplicatedFilter(pod corev1.Pod) podDeleteStatus { 197 | // any finished pod can be removed 198 | if pod.Status.Phase == corev1.PodSucceeded || pod.Status.Phase == corev1.PodFailed { 199 | return makePodDeleteStatusOkay() 200 | } 201 | 202 | controllerRef := metav1.GetControllerOf(&pod) 203 | if controllerRef != nil { 204 | return makePodDeleteStatusOkay() 205 | } 206 | if d.Force { 207 | return makePodDeleteStatusWithWarning(true, unmanagedWarning) 208 | } 209 | return makePodDeleteStatusWithError(unmanagedFatal) 210 | } 211 | -------------------------------------------------------------------------------- /.github/workflows/go.yml: -------------------------------------------------------------------------------- 1 | name: Go 2 | 3 | on: 4 | workflow_dispatch: 5 | inputs: 6 | version: 7 | required: true 8 | prerelease: 9 | required: true 10 | default: "true" 11 | draft: 12 | required: true 13 | default: "true" 14 | 15 | jobs: 16 | 17 | build: 18 | name: Build 19 | runs-on: ubuntu-latest 20 | steps: 21 | 22 | - name: Set up Go 1.x 23 | uses: actions/setup-go@v2 24 | with: 25 | go-version: ^1.13 26 | id: go 27 | 28 | - name: Check out code into the Go module directory 29 | uses: actions/checkout@v2 30 | 31 | - name: Get dependencies 32 | run: | 33 | go get -v -t -d ./... 34 | if [ -f Gopkg.toml ]; then 35 | curl https://raw.githubusercontent.com/golang/dep/master/install.sh | sh 36 | dep ensure 37 | fi 38 | 39 | - name: Build 40 | run: make build VERSION=${{ github.event.inputs.version }} 41 | - name: Create a Release 42 | id: create_release 43 | uses: actions/create-release@v1 44 | env: 45 | GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }} 46 | with: 47 | tag_name: v${{ github.event.inputs.version }} 48 | release_name: v${{ github.event.inputs.version }} 49 | body: released v${{ github.event.inputs.version }} 50 | draft: ${{ github.event.inputs.draft }} 51 | prerelease: ${{ github.event.inputs.prerelease }} 52 | 53 | - name: Upload a Release Asset 54 | uses: actions/upload-release-asset@v1.0.2 55 | env: 56 | GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }} 57 | with: 58 | upload_url: ${{ steps.create_release.outputs.upload_url }} 59 | asset_path: kubectl-safe-drain_${{ github.event.inputs.version }}_darwin_arm64.tar.gz 60 | asset_name: kubectl-safe-drain_${{ github.event.inputs.version }}_darwin_arm64.tar.gz 61 | asset_content_type: application/octet-stream 62 | 63 | - name: Upload a Release Asset 64 | uses: actions/upload-release-asset@v1.0.2 65 | env: 66 | GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }} 67 | with: 68 | upload_url: ${{ steps.create_release.outputs.upload_url }} 69 | asset_path: kubectl-safe-drain_${{ github.event.inputs.version }}_darwin_amd64.tar.gz 70 | asset_name: kubectl-safe-drain_${{ github.event.inputs.version }}_darwin_amd64.tar.gz 71 | asset_content_type: application/octet-stream 72 | 73 | - name: Upload a Release Asset 74 | uses: actions/upload-release-asset@v1.0.2 75 | env: 76 | GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }} 77 | with: 78 | upload_url: ${{ steps.create_release.outputs.upload_url }} 79 | asset_path: kubectl-safe-drain_${{ github.event.inputs.version }}_freebsd_386.tar.gz 80 | asset_name: kubectl-safe-drain_${{ github.event.inputs.version }}_freebsd_386.tar.gz 81 | asset_content_type: application/octet-stream 82 | 83 | 84 | - name: Upload a Release Asset 85 | uses: actions/upload-release-asset@v1.0.2 86 | env: 87 | GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }} 88 | with: 89 | upload_url: ${{ steps.create_release.outputs.upload_url }} 90 | asset_path: kubectl-safe-drain_${{ github.event.inputs.version }}_freebsd_amd64.tar.gz 91 | asset_name: kubectl-safe-drain_${{ github.event.inputs.version }}_freebsd_amd64.tar.gz 92 | asset_content_type: application/octet-stream 93 | 94 | - name: Upload a Release Asset 95 | uses: actions/upload-release-asset@v1.0.2 96 | env: 97 | GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }} 98 | with: 99 | upload_url: ${{ steps.create_release.outputs.upload_url }} 100 | asset_path: kubectl-safe-drain_${{ github.event.inputs.version }}_freebsd_arm64.tar.gz 101 | asset_name: kubectl-safe-drain_${{ github.event.inputs.version }}_freebsd_arm64.tar.gz 102 | asset_content_type: application/octet-stream 103 | 104 | - name: Upload a Release Asset 105 | uses: actions/upload-release-asset@v1.0.2 106 | env: 107 | GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }} 108 | with: 109 | upload_url: ${{ steps.create_release.outputs.upload_url }} 110 | asset_path: kubectl-safe-drain_${{ github.event.inputs.version }}_linux_386.tar.gz 111 | asset_name: kubectl-safe-drain_${{ github.event.inputs.version }}_linux_386.tar.gz 112 | asset_content_type: application/octet-stream 113 | 114 | - name: Upload a Release Asset 115 | uses: actions/upload-release-asset@v1.0.2 116 | env: 117 | GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }} 118 | with: 119 | upload_url: ${{ steps.create_release.outputs.upload_url }} 120 | asset_path: kubectl-safe-drain_${{ github.event.inputs.version }}_linux_amd64.tar.gz 121 | asset_name: kubectl-safe-drain_${{ github.event.inputs.version }}_linux_amd64.tar.gz 122 | asset_content_type: application/octet-stream 123 | 124 | - name: Upload a Release Asset 125 | uses: actions/upload-release-asset@v1.0.2 126 | env: 127 | GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }} 128 | with: 129 | upload_url: ${{ steps.create_release.outputs.upload_url }} 130 | asset_path: kubectl-safe-drain_${{ github.event.inputs.version }}_linux_arm64.tar.gz 131 | asset_name: kubectl-safe-drain_${{ github.event.inputs.version }}_linux_arm64.tar.gz 132 | asset_content_type: application/octet-stream 133 | 134 | - name: Upload a Release Asset 135 | uses: actions/upload-release-asset@v1.0.2 136 | env: 137 | GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }} 138 | with: 139 | upload_url: ${{ steps.create_release.outputs.upload_url }} 140 | asset_path: kubectl-safe-drain_${{ github.event.inputs.version }}_windows_386.tar.gz 141 | asset_name: kubectl-safe-drain_${{ github.event.inputs.version }}_windows_386.tar.gz 142 | asset_content_type: application/octet-stream 143 | 144 | - name: Upload a Release Asset 145 | uses: actions/upload-release-asset@v1.0.2 146 | env: 147 | GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }} 148 | with: 149 | upload_url: ${{ steps.create_release.outputs.upload_url }} 150 | asset_path: kubectl-safe-drain_${{ github.event.inputs.version }}_windows_amd64.tar.gz 151 | asset_name: kubectl-safe-drain_${{ github.event.inputs.version }}_windows_amd64.tar.gz 152 | asset_content_type: application/octet-stream 153 | 154 | - name: Upload a Release Asset 155 | uses: actions/upload-release-asset@v1.0.2 156 | env: 157 | GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }} 158 | with: 159 | upload_url: ${{ steps.create_release.outputs.upload_url }} 160 | asset_path: kubectl-safe-drain_${{ github.event.inputs.version }}_windows_arm64.tar.gz 161 | asset_name: kubectl-safe-drain_${{ github.event.inputs.version }}_windows_arm64.tar.gz 162 | asset_content_type: application/octet-stream 163 | -------------------------------------------------------------------------------- /cmd/sdrain/sdrain.go: -------------------------------------------------------------------------------- 1 | package sdrain 2 | 3 | import ( 4 | "fmt" 5 | "kubectl-sdrain/pkg/sdrain" 6 | 7 | "k8s.io/kubectl/pkg/cmd/drain" 8 | 9 | "k8s.io/apimachinery/pkg/runtime/schema" 10 | utilerrors "k8s.io/apimachinery/pkg/util/errors" 11 | "k8s.io/apimachinery/pkg/util/sets" 12 | 13 | "k8s.io/cli-runtime/pkg/resource" 14 | 15 | "k8s.io/kubectl/pkg/util/templates" 16 | 17 | "k8s.io/kubectl/pkg/util/i18n" 18 | 19 | "github.com/spf13/cobra" 20 | 21 | "k8s.io/kubectl/pkg/scheme" 22 | 23 | cmdutil "k8s.io/kubectl/pkg/cmd/util" 24 | 25 | "k8s.io/cli-runtime/pkg/genericclioptions" 26 | "k8s.io/cli-runtime/pkg/printers" 27 | ) 28 | 29 | type SafeDrainCmdOptions struct { 30 | PrintFlags *genericclioptions.PrintFlags 31 | ToPrinter func(string) (printers.ResourcePrinterFunc, error) 32 | 33 | safeDrainer *sdrain.Helper 34 | nodeInfos []*resource.Info 35 | 36 | genericclioptions.IOStreams 37 | } 38 | 39 | var ( 40 | safeDrainLong = templates.LongDesc(i18n.T(` 41 | Safe drain node in preparation for maintenance. 42 | The given node will be marked unschedulable to prevent new pods from arriving.`)) 43 | 44 | safeDrainExample = templates.Examples(i18n.T(` 45 | # Safe drain node "foo", even if there are pods not managed by a ReplicationController, ReplicaSet, Job or StatefulSet on it. 46 | $ kubectl safe-drain foo`)) 47 | ) 48 | 49 | func NewDrainCmdOptions(f cmdutil.Factory, ioStreams genericclioptions.IOStreams) *SafeDrainCmdOptions { 50 | o := &SafeDrainCmdOptions{ 51 | PrintFlags: genericclioptions.NewPrintFlags("safe drained").WithTypeSetter(scheme.Scheme), 52 | IOStreams: ioStreams, 53 | safeDrainer: &sdrain.Helper{ 54 | Out: ioStreams.Out, 55 | ErrOut: ioStreams.ErrOut, 56 | }, 57 | } 58 | return o 59 | } 60 | 61 | func NewCmdSafeDrain(f cmdutil.Factory, ioStreams genericclioptions.IOStreams) *cobra.Command { 62 | o := NewDrainCmdOptions(f, ioStreams) 63 | 64 | cmd := &cobra.Command{ 65 | Use: "safe-drain NODE", 66 | DisableFlagsInUseLine: true, 67 | Short: i18n.T("Safe drain node in preparation for maintenance"), 68 | Long: safeDrainLong, 69 | Example: safeDrainExample, 70 | Run: func(cmd *cobra.Command, args []string) { 71 | cmdutil.CheckErr(o.Complete(f, cmd, args)) 72 | cmdutil.CheckErr(o.RunCordon(f)) 73 | cmdutil.CheckErr(o.RunSafeDrain()) 74 | }, 75 | } 76 | 77 | cmd.Flags().BoolVar(&o.safeDrainer.Force, "force", o.safeDrainer.Force, "Continue even if there are pods not managed by a ReplicationController, ReplicaSet, Job, DaemonSet or StatefulSet.") 78 | cmd.Flags().BoolVar(&o.safeDrainer.DeleteLocalData, "delete-local-data", o.safeDrainer.DeleteLocalData, "Continue even if there are pods using emptyDir (local data that will be deleted when the node is drained).") 79 | cmd.Flags().DurationVar(&o.safeDrainer.Timeout, "timeout", o.safeDrainer.Timeout, "The length of time to wait before giving up, zero means infinite") 80 | cmd.Flags().StringVarP(&o.safeDrainer.Selector, "selector", "l", o.safeDrainer.Selector, "Selector (label query) to filter on") 81 | 82 | cmdutil.AddDryRunFlag(cmd) 83 | return cmd 84 | } 85 | 86 | func (o *SafeDrainCmdOptions) Complete(f cmdutil.Factory, cmd *cobra.Command, args []string) error { 87 | var err error 88 | 89 | if len(args) == 0 && !cmd.Flags().Changed("selector") { 90 | return cmdutil.UsageErrorf(cmd, fmt.Sprintf("USAGE: %s [flags]", cmd.Use)) 91 | } 92 | if len(args) > 0 && len(o.safeDrainer.Selector) > 0 { 93 | return cmdutil.UsageErrorf(cmd, "error: cannot specify both a node name and a --selector option") 94 | } 95 | 96 | o.safeDrainer.DryRun = cmdutil.GetDryRunFlag(cmd) 97 | 98 | if o.safeDrainer.Client, err = f.KubernetesClientSet(); err != nil { 99 | return err 100 | } 101 | 102 | o.ToPrinter = func(operation string) (printers.ResourcePrinterFunc, error) { 103 | o.PrintFlags.NamePrintFlags.Operation = operation 104 | if o.safeDrainer.DryRun { 105 | err := o.PrintFlags.Complete("%s (dry run)") 106 | if err != nil { 107 | return nil, err 108 | } 109 | } 110 | 111 | printer, err := o.PrintFlags.ToPrinter() 112 | if err != nil { 113 | return nil, err 114 | } 115 | 116 | return printer.PrintObj, nil 117 | } 118 | 119 | builder := f.NewBuilder(). 120 | WithScheme(scheme.Scheme, scheme.Scheme.PrioritizedVersionsAllGroups()...). 121 | ResourceNames("nodes", args...). 122 | SingleResourceType(). 123 | Flatten() 124 | 125 | if len(o.safeDrainer.Selector) > 0 { 126 | builder = builder.LabelSelectorParam(o.safeDrainer.Selector). 127 | ResourceTypes("nodes") 128 | } 129 | 130 | r := builder.Do() 131 | 132 | if err = r.Err(); err != nil { 133 | return err 134 | } 135 | 136 | return r.Visit(func(info *resource.Info, err error) error { 137 | if err != nil { 138 | return err 139 | } 140 | if info.Mapping.Resource.GroupResource() != (schema.GroupResource{Group: "", Resource: "nodes"}) { 141 | return fmt.Errorf("error: expected resource of type node, got %q", info.Mapping.Resource) 142 | } 143 | 144 | o.nodeInfos = append(o.nodeInfos, info) 145 | return nil 146 | }) 147 | } 148 | 149 | func (o *SafeDrainCmdOptions) RunCordon(f cmdutil.Factory) error { 150 | var args []string 151 | for _, info := range o.nodeInfos { 152 | args = append(args, info.Name) 153 | } 154 | 155 | if o.safeDrainer.DryRun { 156 | args = append(args, "--dry-run") 157 | } 158 | 159 | cordonCmd := drain.NewCmdCordon(f, o.IOStreams) 160 | cordonCmd.SetArgs(args) 161 | return cordonCmd.Execute() 162 | } 163 | 164 | func (o *SafeDrainCmdOptions) RunSafeDrain() error { 165 | printObj, err := o.ToPrinter("safe drained") 166 | if err != nil { 167 | return err 168 | } 169 | 170 | drainedNodes := sets.NewString() 171 | 172 | var fatal error 173 | for _, info := range o.nodeInfos { 174 | var err error 175 | 176 | if !o.safeDrainer.DryRun { 177 | err = o.safeDeleteOrEvictPodsSimple(info) 178 | } 179 | 180 | if err == nil || o.safeDrainer.DryRun { 181 | drainedNodes.Insert(info.Name) 182 | printObj(info.Object, o.Out) 183 | continue 184 | } else { 185 | fmt.Fprintf(o.ErrOut, "error: unable to safe-drain node %q, aborting command...\n\n", info.Name) 186 | var remainingNodes []string 187 | fatal = err 188 | for _, remainingInfo := range o.nodeInfos { 189 | if drainedNodes.Has(remainingInfo.Name) { 190 | continue 191 | } 192 | remainingNodes = append(remainingNodes, remainingInfo.Name) 193 | } 194 | 195 | if len(remainingNodes) > 0 { 196 | fmt.Fprintf(o.ErrOut, "There are pending nodes to be drained:\n") 197 | for _, nodeName := range remainingNodes { 198 | fmt.Fprintf(o.ErrOut, " %s\n", nodeName) 199 | } 200 | } 201 | break 202 | } 203 | 204 | } 205 | 206 | return fatal 207 | } 208 | 209 | func (o *SafeDrainCmdOptions) safeDeleteOrEvictPodsSimple(nodeInfo *resource.Info) error { 210 | list, errs := o.safeDrainer.GetPodsForDeletion(nodeInfo.Name) 211 | if errs != nil { 212 | return utilerrors.NewAggregate(errs) 213 | } 214 | 215 | if err := o.safeDrainer.MigratePods(list); err != nil { 216 | pendingList, newErrs := o.safeDrainer.GetPodsForDeletion(nodeInfo.Name) 217 | if pendingList != nil { 218 | pods := pendingList.Pods() 219 | if len(pods) != 0 { 220 | fmt.Fprintf(o.ErrOut, "There are pending pods in node %q when an error occurred: %v\n", nodeInfo.Name, err) 221 | for _, pendingPod := range pods { 222 | fmt.Fprintf(o.ErrOut, "%s/%s\n", "pod", pendingPod.Name) 223 | } 224 | } 225 | } 226 | if newErrs != nil { 227 | fmt.Fprintf(o.ErrOut, "Following errors occurred while getting the list of pods to delete:\n%s", utilerrors.NewAggregate(newErrs)) 228 | } 229 | return err 230 | } 231 | return nil 232 | } 233 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | Apache License 2 | Version 2.0, January 2004 3 | http://www.apache.org/licenses/ 4 | 5 | TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION 6 | 7 | 1. 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-------------------------------------------------------------------------------- 1 | cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= 2 | cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= 3 | cloud.google.com/go v0.38.0/go.mod h1:990N+gfupTy94rShfmMCWGDn0LpTmnzTp2qbd1dvSRU= 4 | github.com/Azure/go-ansiterm v0.0.0-20170929234023-d6e3b3328b78 h1:w+iIsaOQNcT7OZ575w+acHgRric5iCyQh+xv+KJ4HB8= 5 | github.com/Azure/go-ansiterm v0.0.0-20170929234023-d6e3b3328b78/go.mod h1:LmzpDX56iTiv29bbRTIsUNlaFfuhWRQBWjQdVyAevI8= 6 | github.com/Azure/go-autorest/autorest v0.9.0/go.mod h1:xyHB1BMZT0cuDHU7I0+g046+BFDTQ8rEZB0s4Yfa6bI= 7 | github.com/Azure/go-autorest/autorest/adal v0.5.0/go.mod h1:8Z9fGy2MpX0PvDjB1pEgQTmVqjGhiHBW7RJJEciWzS0= 8 | github.com/Azure/go-autorest/autorest/date v0.1.0/go.mod h1:plvfp3oPSKwf2DNjlBjWF/7vwR+cUD/ELuzDCXwHUVA= 9 | github.com/Azure/go-autorest/autorest/mocks v0.1.0/go.mod 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