ceph-csi/vendor/k8s.io/kubernetes/pkg/kubectl/cmd/delete.go
2018-07-31 14:53:26 +02:00

387 lines
13 KiB
Go

/*
Copyright 2014 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 (
"fmt"
"strings"
"time"
"github.com/golang/glog"
"github.com/spf13/cobra"
appsv1 "k8s.io/api/apps/v1"
"k8s.io/apimachinery/pkg/api/errors"
"k8s.io/apimachinery/pkg/api/meta"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/runtime/schema"
"k8s.io/apimachinery/pkg/util/uuid"
"k8s.io/apimachinery/pkg/util/wait"
"k8s.io/client-go/dynamic"
"k8s.io/kubernetes/pkg/kubectl/cmd/templates"
cmdutil "k8s.io/kubernetes/pkg/kubectl/cmd/util"
kubectlwait "k8s.io/kubernetes/pkg/kubectl/cmd/wait"
"k8s.io/kubernetes/pkg/kubectl/genericclioptions"
"k8s.io/kubernetes/pkg/kubectl/genericclioptions/printers"
"k8s.io/kubernetes/pkg/kubectl/genericclioptions/resource"
"k8s.io/kubernetes/pkg/kubectl/util/i18n"
)
var (
delete_long = templates.LongDesc(i18n.T(`
Delete resources by filenames, stdin, resources and names, or by resources and label selector.
JSON and YAML formats are accepted. Only one type of the arguments may be specified: filenames,
resources and names, or resources and label selector.
Some resources, such as pods, support graceful deletion. These resources define a default period
before they are forcibly terminated (the grace period) but you may override that value with
the --grace-period flag, or pass --now to set a grace-period of 1. Because these resources often
represent entities in the cluster, deletion may not be acknowledged immediately. If the node
hosting a pod is down or cannot reach the API server, termination may take significantly longer
than the grace period. To force delete a resource, you must pass a grace period of 0 and specify
the --force flag.
IMPORTANT: Force deleting pods does not wait for confirmation that the pod's processes have been
terminated, which can leave those processes running until the node detects the deletion and
completes graceful deletion. If your processes use shared storage or talk to a remote API and
depend on the name of the pod to identify themselves, force deleting those pods may result in
multiple processes running on different machines using the same identification which may lead
to data corruption or inconsistency. Only force delete pods when you are sure the pod is
terminated, or if your application can tolerate multiple copies of the same pod running at once.
Also, if you force delete pods the scheduler may place new pods on those nodes before the node
has released those resources and causing those pods to be evicted immediately.
Note that the delete command does NOT do resource version checks, so if someone submits an
update to a resource right when you submit a delete, their update will be lost along with the
rest of the resource.`))
delete_example = templates.Examples(i18n.T(`
# Delete a pod using the type and name specified in pod.json.
kubectl delete -f ./pod.json
# Delete a pod based on the type and name in the JSON passed into stdin.
cat pod.json | kubectl delete -f -
# Delete pods and services with same names "baz" and "foo"
kubectl delete pod,service baz foo
# Delete pods and services with label name=myLabel.
kubectl delete pods,services -l name=myLabel
# Delete a pod with minimal delay
kubectl delete pod foo --now
# Force delete a pod on a dead node
kubectl delete pod foo --grace-period=0 --force
# Delete all pods
kubectl delete pods --all`))
)
type DeleteOptions struct {
resource.FilenameOptions
LabelSelector string
FieldSelector string
DeleteAll bool
IgnoreNotFound bool
Cascade bool
DeleteNow bool
ForceDeletion bool
WaitForDeletion bool
GracePeriod int
Timeout time.Duration
Output string
DynamicClient dynamic.Interface
Mapper meta.RESTMapper
Result *resource.Result
genericclioptions.IOStreams
}
func NewCmdDelete(f cmdutil.Factory, streams genericclioptions.IOStreams) *cobra.Command {
deleteFlags := NewDeleteCommandFlags("containing the resource to delete.")
cmd := &cobra.Command{
Use: "delete ([-f FILENAME] | TYPE [(NAME | -l label | --all)])",
DisableFlagsInUseLine: true,
Short: i18n.T("Delete resources by filenames, stdin, resources and names, or by resources and label selector"),
Long: delete_long,
Example: delete_example,
Run: func(cmd *cobra.Command, args []string) {
o := deleteFlags.ToOptions(nil, streams)
cmdutil.CheckErr(o.Complete(f, args, cmd))
cmdutil.CheckErr(o.Validate(cmd))
cmdutil.CheckErr(o.RunDelete())
},
SuggestFor: []string{"rm"},
}
deleteFlags.AddFlags(cmd)
cmdutil.AddIncludeUninitializedFlag(cmd)
return cmd
}
func (o *DeleteOptions) Complete(f cmdutil.Factory, args []string, cmd *cobra.Command) error {
cmdNamespace, enforceNamespace, err := f.ToRawKubeConfigLoader().Namespace()
if err != nil {
return err
}
if o.DeleteAll || len(o.LabelSelector) > 0 || len(o.FieldSelector) > 0 {
if f := cmd.Flags().Lookup("ignore-not-found"); f != nil && !f.Changed {
// If the user didn't explicitly set the option, default to ignoring NotFound errors when used with --all, -l, or --field-selector
o.IgnoreNotFound = true
}
}
if o.DeleteNow {
if o.GracePeriod != -1 {
return fmt.Errorf("--now and --grace-period cannot be specified together")
}
o.GracePeriod = 1
}
if o.GracePeriod == 0 && !o.ForceDeletion {
// To preserve backwards compatibility, but prevent accidental data loss, we convert --grace-period=0
// into --grace-period=1. Users may provide --force to bypass this conversion.
o.GracePeriod = 1
}
includeUninitialized := cmdutil.ShouldIncludeUninitialized(cmd, false)
r := f.NewBuilder().
Unstructured().
ContinueOnError().
NamespaceParam(cmdNamespace).DefaultNamespace().
FilenameParam(enforceNamespace, &o.FilenameOptions).
LabelSelectorParam(o.LabelSelector).
FieldSelectorParam(o.FieldSelector).
IncludeUninitialized(includeUninitialized).
SelectAllParam(o.DeleteAll).
ResourceTypeOrNameArgs(false, args...).RequireObject(false).
Flatten().
Do()
err = r.Err()
if err != nil {
return err
}
o.Result = r
o.Mapper, err = f.ToRESTMapper()
if err != nil {
return err
}
o.DynamicClient, err = f.DynamicClient()
if err != nil {
return err
}
return nil
}
func (o *DeleteOptions) Validate(cmd *cobra.Command) error {
if o.Output != "" && o.Output != "name" {
return cmdutil.UsageErrorf(cmd, "Unexpected -o output mode: %v. We only support '-o name'.", o.Output)
}
if o.DeleteAll && len(o.LabelSelector) > 0 {
return fmt.Errorf("cannot set --all and --selector at the same time")
}
if o.DeleteAll && len(o.FieldSelector) > 0 {
return fmt.Errorf("cannot set --all and --field-selector at the same time")
}
if o.GracePeriod == 0 && !o.ForceDeletion && !o.WaitForDeletion {
// With the explicit --wait flag we need extra validation for backward compatibility
return fmt.Errorf("--grace-period=0 must have either --force specified, or --wait to be set to true")
}
switch {
case o.GracePeriod == 0 && o.ForceDeletion:
fmt.Fprintf(o.ErrOut, "warning: Immediate deletion does not wait for confirmation that the running resource has been terminated. The resource may continue to run on the cluster indefinitely.\n")
case o.ForceDeletion:
fmt.Fprintf(o.ErrOut, "warning: --force is ignored because --grace-period is not 0.\n")
}
return nil
}
func (o *DeleteOptions) RunDelete() error {
return o.DeleteResult(o.Result)
}
func (o *DeleteOptions) DeleteResult(r *resource.Result) error {
found := 0
if o.IgnoreNotFound {
r = r.IgnoreErrors(errors.IsNotFound)
}
deletedInfos := []*resource.Info{}
err := r.Visit(func(info *resource.Info, err error) error {
if err != nil {
return err
}
deletedInfos = append(deletedInfos, info)
found++
options := &metav1.DeleteOptions{}
if o.GracePeriod >= 0 {
options = metav1.NewDeleteOptions(int64(o.GracePeriod))
}
policy := metav1.DeletePropagationBackground
if !o.Cascade {
policy = metav1.DeletePropagationOrphan
}
options.PropagationPolicy = &policy
return o.deleteResource(info, options)
})
if err != nil {
return err
}
if found == 0 {
fmt.Fprintf(o.Out, "No resources found\n")
return nil
}
if !o.WaitForDeletion {
return nil
}
// if we don't have a dynamic client, we don't want to wait. Eventually when delete is cleaned up, this will likely
// drop out.
if o.DynamicClient == nil {
return nil
}
effectiveTimeout := o.Timeout
if effectiveTimeout == 0 {
// if we requested to wait forever, set it to a week.
effectiveTimeout = 168 * time.Hour
}
waitOptions := kubectlwait.WaitOptions{
ResourceFinder: genericclioptions.ResourceFinderForResult(resource.InfoListVisitor(deletedInfos)),
DynamicClient: o.DynamicClient,
Timeout: effectiveTimeout,
Printer: printers.NewDiscardingPrinter(),
ConditionFn: kubectlwait.IsDeleted,
IOStreams: o.IOStreams,
}
err = waitOptions.RunWait()
if errors.IsForbidden(err) {
// if we're forbidden from waiting, we shouldn't fail.
glog.V(1).Info(err)
return nil
}
return err
}
func (o *DeleteOptions) deleteResource(info *resource.Info, deleteOptions *metav1.DeleteOptions) error {
// TODO: Remove this in or after 1.12 release.
// Server version >= 1.11 no longer needs this hack.
mapping := info.ResourceMapping()
if mapping.Resource.GroupResource() == (schema.GroupResource{Group: "extensions", Resource: "daemonsets"}) ||
mapping.Resource.GroupResource() == (schema.GroupResource{Group: "apps", Resource: "daemonsets"}) {
if err := updateDaemonSet(info.Namespace, info.Name, o.DynamicClient); err != nil {
return err
}
}
if err := resource.NewHelper(info.Client, info.Mapping).DeleteWithOptions(info.Namespace, info.Name, deleteOptions); err != nil {
return cmdutil.AddSourceToErr("deleting", info.Source, err)
}
o.PrintObj(info)
return nil
}
// TODO: Remove this in or after 1.12 release.
// Server version >= 1.11 no longer needs this hack.
func updateDaemonSet(namespace, name string, dynamicClient dynamic.Interface) error {
dsClient := dynamicClient.Resource(schema.GroupVersionResource{Group: "apps", Version: "v1", Resource: "daemonsets"}).Namespace(namespace)
obj, err := dsClient.Get(name, metav1.GetOptions{})
if err != nil {
return err
}
ds := &appsv1.DaemonSet{}
if err := runtime.DefaultUnstructuredConverter.FromUnstructured(obj.Object, ds); err != nil {
return err
}
// We set the nodeSelector to a random label. This label is nearly guaranteed
// to not be set on any node so the DameonSetController will start deleting
// daemon pods. Once it's done deleting the daemon pods, it's safe to delete
// the DaemonSet.
ds.Spec.Template.Spec.NodeSelector = map[string]string{
string(uuid.NewUUID()): string(uuid.NewUUID()),
}
// force update to avoid version conflict
ds.ResourceVersion = ""
out, err := runtime.DefaultUnstructuredConverter.ToUnstructured(ds)
if err != nil {
return err
}
if _, err = dsClient.Update(&unstructured.Unstructured{Object: out}); err != nil {
return err
}
// Wait for the daemon set controller to kill all the daemon pods.
if err := wait.Poll(1*time.Second, 5*time.Minute, func() (bool, error) {
updatedObj, err := dsClient.Get(name, metav1.GetOptions{})
if err != nil {
return false, nil
}
updatedDS := &appsv1.DaemonSet{}
if err := runtime.DefaultUnstructuredConverter.FromUnstructured(updatedObj.Object, ds); err != nil {
return false, nil
}
return updatedDS.Status.CurrentNumberScheduled+updatedDS.Status.NumberMisscheduled == 0, nil
}); err != nil {
return err
}
return nil
}
// deletion printing is special because we do not have an object to print.
// This mirrors name printer behavior
func (o *DeleteOptions) PrintObj(info *resource.Info) {
operation := "deleted"
groupKind := info.Mapping.GroupVersionKind
kindString := fmt.Sprintf("%s.%s", strings.ToLower(groupKind.Kind), groupKind.Group)
if len(groupKind.Group) == 0 {
kindString = strings.ToLower(groupKind.Kind)
}
if o.GracePeriod == 0 {
operation = "force deleted"
}
if o.Output == "name" {
// -o name: prints resource/name
fmt.Fprintf(o.Out, "%s/%s\n", kindString, info.Name)
return
}
// understandable output by default
fmt.Fprintf(o.Out, "%s \"%s\" %s\n", kindString, info.Name, operation)
}