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drain.go
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drain.go
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/*
Copyright 2015 The Kubernetes Authors.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package cmd
import (
"errors"
"fmt"
"io"
"math"
"reflect"
"strings"
"time"
"github.com/jonboulle/clockwork"
"github.com/spf13/cobra"
apierrors "k8s.io/apimachinery/pkg/api/errors"
"k8s.io/apimachinery/pkg/api/meta"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/fields"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/util/wait"
restclient "k8s.io/client-go/rest"
"k8s.io/kubernetes/pkg/api"
"k8s.io/kubernetes/pkg/apis/policy"
"k8s.io/kubernetes/pkg/client/clientset_generated/internalclientset"
"k8s.io/kubernetes/pkg/kubectl"
"k8s.io/kubernetes/pkg/kubectl/cmd/templates"
cmdutil "k8s.io/kubernetes/pkg/kubectl/cmd/util"
"k8s.io/kubernetes/pkg/kubectl/resource"
"k8s.io/kubernetes/pkg/kubelet/types"
"k8s.io/kubernetes/pkg/util/i18n"
)
type DrainOptions struct {
client internalclientset.Interface
restClient *restclient.RESTClient
Factory cmdutil.Factory
Force bool
GracePeriodSeconds int
IgnoreDaemonsets bool
Timeout time.Duration
backOff clockwork.Clock
DeleteLocalData bool
mapper meta.RESTMapper
nodeInfo *resource.Info
Out io.Writer
ErrOut io.Writer
typer runtime.ObjectTyper
}
// Takes a pod and returns a bool indicating whether or not to operate on the
// pod, an optional warning message, and an optional fatal error.
type podFilter func(api.Pod) (include bool, w *warning, f *fatal)
type warning struct {
string
}
type fatal struct {
string
}
const (
EvictionKind = "Eviction"
EvictionSubresource = "pods/eviction"
kDaemonsetFatal = "DaemonSet-managed pods (use --ignore-daemonsets to ignore)"
kDaemonsetWarning = "Ignoring DaemonSet-managed pods"
kLocalStorageFatal = "pods with local storage (use --delete-local-data to override)"
kLocalStorageWarning = "Deleting pods with local storage"
kUnmanagedFatal = "pods not managed by ReplicationController, ReplicaSet, Job, DaemonSet or StatefulSet (use --force to override)"
kUnmanagedWarning = "Deleting pods not managed by ReplicationController, ReplicaSet, Job, DaemonSet or StatefulSet"
kMaxNodeUpdateRetry = 10
)
var (
cordon_long = templates.LongDesc(i18n.T(`
Mark node as unschedulable.`))
cordon_example = templates.Examples(i18n.T(`
# Mark node "foo" as unschedulable.
kubectl cordon foo`))
)
func NewCmdCordon(f cmdutil.Factory, out io.Writer) *cobra.Command {
options := &DrainOptions{Factory: f, Out: out}
cmd := &cobra.Command{
Use: "cordon NODE",
Short: i18n.T("Mark node as unschedulable"),
Long: cordon_long,
Example: cordon_example,
Run: func(cmd *cobra.Command, args []string) {
cmdutil.CheckErr(options.SetupDrain(cmd, args))
cmdutil.CheckErr(options.RunCordonOrUncordon(true))
},
}
return cmd
}
var (
uncordon_long = templates.LongDesc(i18n.T(`
Mark node as schedulable.`))
uncordon_example = templates.Examples(i18n.T(`
# Mark node "foo" as schedulable.
$ kubectl uncordon foo`))
)
func NewCmdUncordon(f cmdutil.Factory, out io.Writer) *cobra.Command {
options := &DrainOptions{Factory: f, Out: out}
cmd := &cobra.Command{
Use: "uncordon NODE",
Short: i18n.T("Mark node as schedulable"),
Long: uncordon_long,
Example: uncordon_example,
Run: func(cmd *cobra.Command, args []string) {
cmdutil.CheckErr(options.SetupDrain(cmd, args))
cmdutil.CheckErr(options.RunCordonOrUncordon(false))
},
}
return cmd
}
var (
drain_long = templates.LongDesc(i18n.T(`
Drain node in preparation for maintenance.
The given node will be marked unschedulable to prevent new pods from arriving.
'drain' evicts the pods if the APIServer supports eviction
(http://kubernetes.io/docs/admin/disruptions/). Otherwise, it will use normal DELETE
to delete the pods.
The 'drain' evicts or deletes all pods except mirror pods (which cannot be deleted through
the API server). If there are DaemonSet-managed pods, drain will not proceed
without --ignore-daemonsets, and regardless it will not delete any
DaemonSet-managed pods, because those pods would be immediately replaced by the
DaemonSet controller, which ignores unschedulable markings. If there are any
pods that are neither mirror pods nor managed by ReplicationController,
ReplicaSet, DaemonSet, StatefulSet or Job, then drain will not delete any pods unless you
use --force. --force will also allow deletion to proceed if the managing resource of one
or more pods is missing.
'drain' waits for graceful termination. You should not operate on the machine until
the command completes.
When you are ready to put the node back into service, use kubectl uncordon, which
will make the node schedulable again.
![Workflow](http://kubernetes.io/images/docs/kubectl_drain.svg)`))
drain_example = templates.Examples(i18n.T(`
# Drain node "foo", even if there are pods not managed by a ReplicationController, ReplicaSet, Job, DaemonSet or StatefulSet on it.
$ kubectl drain foo --force
# As above, but abort if there are pods not managed by a ReplicationController, ReplicaSet, Job, DaemonSet or StatefulSet, and use a grace period of 15 minutes.
$ kubectl drain foo --grace-period=900`))
)
func NewCmdDrain(f cmdutil.Factory, out, errOut io.Writer) *cobra.Command {
options := &DrainOptions{Factory: f, Out: out, ErrOut: errOut, backOff: clockwork.NewRealClock()}
cmd := &cobra.Command{
Use: "drain NODE",
Short: i18n.T("Drain node in preparation for maintenance"),
Long: drain_long,
Example: drain_example,
Run: func(cmd *cobra.Command, args []string) {
cmdutil.CheckErr(options.SetupDrain(cmd, args))
cmdutil.CheckErr(options.RunDrain())
},
}
cmd.Flags().BoolVar(&options.Force, "force", false, "Continue even if there are pods not managed by a ReplicationController, ReplicaSet, Job, DaemonSet or StatefulSet.")
cmd.Flags().BoolVar(&options.IgnoreDaemonsets, "ignore-daemonsets", false, "Ignore DaemonSet-managed pods.")
cmd.Flags().BoolVar(&options.DeleteLocalData, "delete-local-data", false, "Continue even if there are pods using emptyDir (local data that will be deleted when the node is drained).")
cmd.Flags().IntVar(&options.GracePeriodSeconds, "grace-period", -1, "Period of time in seconds given to each pod to terminate gracefully. If negative, the default value specified in the pod will be used.")
cmd.Flags().DurationVar(&options.Timeout, "timeout", 0, "The length of time to wait before giving up, zero means infinite")
return cmd
}
// SetupDrain populates some fields from the factory, grabs command line
// arguments and looks up the node using Builder
func (o *DrainOptions) SetupDrain(cmd *cobra.Command, args []string) error {
var err error
if len(args) != 1 {
return cmdutil.UsageError(cmd, fmt.Sprintf("USAGE: %s [flags]", cmd.Use))
}
if o.client, err = o.Factory.ClientSet(); err != nil {
return err
}
o.restClient, err = o.Factory.RESTClient()
if err != nil {
return err
}
o.mapper, o.typer = o.Factory.Object()
cmdNamespace, _, err := o.Factory.DefaultNamespace()
if err != nil {
return err
}
r := o.Factory.NewBuilder(true).
NamespaceParam(cmdNamespace).DefaultNamespace().
ResourceNames("node", args[0]).
Do()
if err = r.Err(); err != nil {
return err
}
return r.Visit(func(info *resource.Info, err error) error {
if err != nil {
return err
}
o.nodeInfo = info
return nil
})
}
// RunDrain runs the 'drain' command
func (o *DrainOptions) RunDrain() error {
if err := o.RunCordonOrUncordon(true); err != nil {
return err
}
err := o.deleteOrEvictPodsSimple()
if err == nil {
cmdutil.PrintSuccess(o.mapper, false, o.Out, "node", o.nodeInfo.Name, false, "drained")
}
return err
}
func (o *DrainOptions) deleteOrEvictPodsSimple() error {
pods, err := o.getPodsForDeletion()
if err != nil {
return err
}
err = o.deleteOrEvictPods(pods)
if err != nil {
pendingPods, newErr := o.getPodsForDeletion()
if newErr != nil {
return newErr
}
fmt.Fprintf(o.ErrOut, "There are pending pods when an error occurred: %v\n", err)
for _, pendingPod := range pendingPods {
fmt.Fprintf(o.ErrOut, "%s/%s\n", "pod", pendingPod.Name)
}
}
return err
}
func (o *DrainOptions) getController(sr *api.SerializedReference) (interface{}, error) {
switch sr.Reference.Kind {
case "ReplicationController":
return o.client.Core().ReplicationControllers(sr.Reference.Namespace).Get(sr.Reference.Name, metav1.GetOptions{})
case "DaemonSet":
return o.client.Extensions().DaemonSets(sr.Reference.Namespace).Get(sr.Reference.Name, metav1.GetOptions{})
case "Job":
return o.client.Batch().Jobs(sr.Reference.Namespace).Get(sr.Reference.Name, metav1.GetOptions{})
case "ReplicaSet":
return o.client.Extensions().ReplicaSets(sr.Reference.Namespace).Get(sr.Reference.Name, metav1.GetOptions{})
case "StatefulSet":
return o.client.Apps().StatefulSets(sr.Reference.Namespace).Get(sr.Reference.Name, metav1.GetOptions{})
}
return nil, fmt.Errorf("Unknown controller kind %q", sr.Reference.Kind)
}
func (o *DrainOptions) getPodCreator(pod api.Pod) (*api.SerializedReference, error) {
creatorRef, found := pod.ObjectMeta.Annotations[api.CreatedByAnnotation]
if !found {
return nil, nil
}
// Now verify that the specified creator actually exists.
sr := &api.SerializedReference{}
if err := runtime.DecodeInto(o.Factory.Decoder(true), []byte(creatorRef), sr); err != nil {
return nil, err
}
// We assume the only reason for an error is because the controller is
// gone/missing, not for any other cause. TODO(mml): something more
// sophisticated than this
_, err := o.getController(sr)
if err != nil {
return nil, err
}
return sr, nil
}
func (o *DrainOptions) unreplicatedFilter(pod api.Pod) (bool, *warning, *fatal) {
// any finished pod can be removed
if pod.Status.Phase == api.PodSucceeded || pod.Status.Phase == api.PodFailed {
return true, nil, nil
}
sr, err := o.getPodCreator(pod)
if err != nil {
// if we're forcing, remove orphaned pods with a warning
if apierrors.IsNotFound(err) && o.Force {
return true, &warning{err.Error()}, nil
}
return false, nil, &fatal{err.Error()}
}
if sr != nil {
return true, nil, nil
}
if !o.Force {
return false, nil, &fatal{kUnmanagedFatal}
}
return true, &warning{kUnmanagedWarning}, nil
}
func (o *DrainOptions) daemonsetFilter(pod api.Pod) (bool, *warning, *fatal) {
// Note that we return false in cases where the pod is DaemonSet managed,
// regardless of flags. We never delete them, the only question is whether
// their presence constitutes an error.
//
// The exception is for pods that are orphaned (the referencing
// management resource - including DaemonSet - is not found).
// Such pods will be deleted if --force is used.
sr, err := o.getPodCreator(pod)
if err != nil {
// if we're forcing, remove orphaned pods with a warning
if apierrors.IsNotFound(err) && o.Force {
return true, &warning{err.Error()}, nil
}
return false, nil, &fatal{err.Error()}
}
if sr == nil || sr.Reference.Kind != "DaemonSet" {
return true, nil, nil
}
if _, err := o.client.Extensions().DaemonSets(sr.Reference.Namespace).Get(sr.Reference.Name, metav1.GetOptions{}); err != nil {
return false, nil, &fatal{err.Error()}
}
if !o.IgnoreDaemonsets {
return false, nil, &fatal{kDaemonsetFatal}
}
return false, &warning{kDaemonsetWarning}, nil
}
func mirrorPodFilter(pod api.Pod) (bool, *warning, *fatal) {
if _, found := pod.ObjectMeta.Annotations[types.ConfigMirrorAnnotationKey]; found {
return false, nil, nil
}
return true, nil, nil
}
func hasLocalStorage(pod api.Pod) bool {
for _, volume := range pod.Spec.Volumes {
if volume.EmptyDir != nil {
return true
}
}
return false
}
func (o *DrainOptions) localStorageFilter(pod api.Pod) (bool, *warning, *fatal) {
if !hasLocalStorage(pod) {
return true, nil, nil
}
if !o.DeleteLocalData {
return false, nil, &fatal{kLocalStorageFatal}
}
return true, &warning{kLocalStorageWarning}, nil
}
// Map of status message to a list of pod names having that status.
type podStatuses map[string][]string
func (ps podStatuses) Message() string {
msgs := []string{}
for key, pods := range ps {
msgs = append(msgs, fmt.Sprintf("%s: %s", key, strings.Join(pods, ", ")))
}
return strings.Join(msgs, "; ")
}
// getPodsForDeletion returns all the pods we're going to delete. If there are
// any pods preventing us from deleting, we return that list in an error.
func (o *DrainOptions) getPodsForDeletion() (pods []api.Pod, err error) {
podList, err := o.client.Core().Pods(metav1.NamespaceAll).List(metav1.ListOptions{
FieldSelector: fields.SelectorFromSet(fields.Set{"spec.nodeName": o.nodeInfo.Name}).String()})
if err != nil {
return pods, err
}
ws := podStatuses{}
fs := podStatuses{}
for _, pod := range podList.Items {
podOk := true
for _, filt := range []podFilter{mirrorPodFilter, o.localStorageFilter, o.unreplicatedFilter, o.daemonsetFilter} {
filterOk, w, f := filt(pod)
podOk = podOk && filterOk
if w != nil {
ws[w.string] = append(ws[w.string], pod.Name)
}
if f != nil {
fs[f.string] = append(fs[f.string], pod.Name)
}
}
if podOk {
pods = append(pods, pod)
}
}
if len(fs) > 0 {
return []api.Pod{}, errors.New(fs.Message())
}
if len(ws) > 0 {
fmt.Fprintf(o.ErrOut, "WARNING: %s\n", ws.Message())
}
return pods, nil
}
func (o *DrainOptions) deletePod(pod api.Pod) error {
deleteOptions := &metav1.DeleteOptions{}
if o.GracePeriodSeconds >= 0 {
gracePeriodSeconds := int64(o.GracePeriodSeconds)
deleteOptions.GracePeriodSeconds = &gracePeriodSeconds
}
return o.client.Core().Pods(pod.Namespace).Delete(pod.Name, deleteOptions)
}
func (o *DrainOptions) evictPod(pod api.Pod, policyGroupVersion string) error {
deleteOptions := &metav1.DeleteOptions{}
if o.GracePeriodSeconds >= 0 {
gracePeriodSeconds := int64(o.GracePeriodSeconds)
deleteOptions.GracePeriodSeconds = &gracePeriodSeconds
}
eviction := &policy.Eviction{
TypeMeta: metav1.TypeMeta{
APIVersion: policyGroupVersion,
Kind: EvictionKind,
},
ObjectMeta: metav1.ObjectMeta{
Name: pod.Name,
Namespace: pod.Namespace,
},
DeleteOptions: deleteOptions,
}
// Remember to change change the URL manipulation func when Evction's version change
return o.client.Policy().Evictions(eviction.Namespace).Evict(eviction)
}
// deleteOrEvictPods deletes or evicts the pods on the api server
func (o *DrainOptions) deleteOrEvictPods(pods []api.Pod) error {
if len(pods) == 0 {
return nil
}
policyGroupVersion, err := SupportEviction(o.client)
if err != nil {
return err
}
getPodFn := func(namespace, name string) (*api.Pod, error) {
return o.client.Core().Pods(namespace).Get(name, metav1.GetOptions{})
}
if len(policyGroupVersion) > 0 {
return o.evictPods(pods, policyGroupVersion, getPodFn)
} else {
return o.deletePods(pods, getPodFn)
}
}
func (o *DrainOptions) evictPods(pods []api.Pod, policyGroupVersion string, getPodFn func(namespace, name string) (*api.Pod, error)) error {
doneCh := make(chan bool, len(pods))
errCh := make(chan error, 1)
for _, pod := range pods {
go func(pod api.Pod, doneCh chan bool, errCh chan error) {
var err error
for {
err = o.evictPod(pod, policyGroupVersion)
if err == nil {
break
} else if apierrors.IsNotFound(err) {
doneCh <- true
return
} else if apierrors.IsTooManyRequests(err) {
time.Sleep(5 * time.Second)
} else {
errCh <- fmt.Errorf("error when evicting pod %q: %v", pod.Name, err)
return
}
}
podArray := []api.Pod{pod}
_, err = o.waitForDelete(podArray, kubectl.Interval, time.Duration(math.MaxInt64), true, getPodFn)
if err == nil {
doneCh <- true
} else {
errCh <- fmt.Errorf("error when waiting for pod %q terminating: %v", pod.Name, err)
}
}(pod, doneCh, errCh)
}
doneCount := 0
// 0 timeout means infinite, we use MaxInt64 to represent it.
var globalTimeout time.Duration
if o.Timeout == 0 {
globalTimeout = time.Duration(math.MaxInt64)
} else {
globalTimeout = o.Timeout
}
for {
select {
case err := <-errCh:
return err
case <-doneCh:
doneCount++
if doneCount == len(pods) {
return nil
}
case <-time.After(globalTimeout):
return fmt.Errorf("Drain did not complete within %v", globalTimeout)
}
}
}
func (o *DrainOptions) deletePods(pods []api.Pod, getPodFn func(namespace, name string) (*api.Pod, error)) error {
// 0 timeout means infinite, we use MaxInt64 to represent it.
var globalTimeout time.Duration
if o.Timeout == 0 {
globalTimeout = time.Duration(math.MaxInt64)
} else {
globalTimeout = o.Timeout
}
for _, pod := range pods {
err := o.deletePod(pod)
if err != nil && !apierrors.IsNotFound(err) {
return err
}
}
_, err := o.waitForDelete(pods, kubectl.Interval, globalTimeout, false, getPodFn)
return err
}
func (o *DrainOptions) waitForDelete(pods []api.Pod, interval, timeout time.Duration, usingEviction bool, getPodFn func(string, string) (*api.Pod, error)) ([]api.Pod, error) {
var verbStr string
if usingEviction {
verbStr = "evicted"
} else {
verbStr = "deleted"
}
err := wait.PollImmediate(interval, timeout, func() (bool, error) {
pendingPods := []api.Pod{}
for i, pod := range pods {
p, err := getPodFn(pod.Namespace, pod.Name)
if apierrors.IsNotFound(err) || (p != nil && p.ObjectMeta.UID != pod.ObjectMeta.UID) {
cmdutil.PrintSuccess(o.mapper, false, o.Out, "pod", pod.Name, false, verbStr)
continue
} else if err != nil {
return false, err
} else {
pendingPods = append(pendingPods, pods[i])
}
}
pods = pendingPods
if len(pendingPods) > 0 {
return false, nil
}
return true, nil
})
return pods, err
}
// SupportEviction uses Discovery API to find out if the server support eviction subresource
// If support, it will return its groupVersion; Otherwise, it will return ""
func SupportEviction(clientset internalclientset.Interface) (string, error) {
discoveryClient := clientset.Discovery()
groupList, err := discoveryClient.ServerGroups()
if err != nil {
return "", err
}
foundPolicyGroup := false
var policyGroupVersion string
for _, group := range groupList.Groups {
if group.Name == "policy" {
foundPolicyGroup = true
policyGroupVersion = group.PreferredVersion.GroupVersion
break
}
}
if !foundPolicyGroup {
return "", nil
}
resourceList, err := discoveryClient.ServerResourcesForGroupVersion("v1")
if err != nil {
return "", err
}
for _, resource := range resourceList.APIResources {
if resource.Name == EvictionSubresource && resource.Kind == EvictionKind {
return policyGroupVersion, nil
}
}
return "", nil
}
// RunCordonOrUncordon runs either Cordon or Uncordon. The desired value for
// "Unschedulable" is passed as the first arg.
func (o *DrainOptions) RunCordonOrUncordon(desired bool) error {
cmdNamespace, _, err := o.Factory.DefaultNamespace()
if err != nil {
return err
}
if o.nodeInfo.Mapping.GroupVersionKind.Kind == "Node" {
unsched := reflect.ValueOf(o.nodeInfo.Object).Elem().FieldByName("Spec").FieldByName("Unschedulable")
if unsched.Bool() == desired {
cmdutil.PrintSuccess(o.mapper, false, o.Out, o.nodeInfo.Mapping.Resource, o.nodeInfo.Name, false, already(desired))
} else {
helper := resource.NewHelper(o.restClient, o.nodeInfo.Mapping)
unsched.SetBool(desired)
var err error
for i := 0; i < kMaxNodeUpdateRetry; i++ {
// We don't care about what previous versions may exist, we always want
// to overwrite, and Replace always sets current ResourceVersion if version is "".
helper.Versioner.SetResourceVersion(o.nodeInfo.Object, "")
_, err = helper.Replace(cmdNamespace, o.nodeInfo.Name, true, o.nodeInfo.Object)
if err != nil {
if !apierrors.IsConflict(err) {
return err
}
} else {
break
}
// It's a race, no need to sleep
}
if err != nil {
return err
}
cmdutil.PrintSuccess(o.mapper, false, o.Out, o.nodeInfo.Mapping.Resource, o.nodeInfo.Name, false, changed(desired))
}
} else {
cmdutil.PrintSuccess(o.mapper, false, o.Out, o.nodeInfo.Mapping.Resource, o.nodeInfo.Name, false, "skipped")
}
return nil
}
// already() and changed() return suitable strings for {un,}cordoning
func already(desired bool) string {
if desired {
return "already cordoned"
}
return "already uncordoned"
}
func changed(desired bool) string {
if desired {
return "cordoned"
}
return "uncordoned"
}