mirror of
https://github.com/k3s-io/k3s.git
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284 lines
9.2 KiB
Go
284 lines
9.2 KiB
Go
/*
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Copyright 2014 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package scale
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import (
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"fmt"
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"time"
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"github.com/spf13/cobra"
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"k8s.io/klog/v2"
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"k8s.io/apimachinery/pkg/api/meta"
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"k8s.io/apimachinery/pkg/types"
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"k8s.io/cli-runtime/pkg/genericclioptions"
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"k8s.io/cli-runtime/pkg/printers"
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"k8s.io/cli-runtime/pkg/resource"
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"k8s.io/client-go/kubernetes"
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cmdutil "k8s.io/kubectl/pkg/cmd/util"
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"k8s.io/kubectl/pkg/scale"
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"k8s.io/kubectl/pkg/util/i18n"
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"k8s.io/kubectl/pkg/util/templates"
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)
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var (
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scaleLong = templates.LongDesc(i18n.T(`
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Set a new size for a Deployment, ReplicaSet, Replication Controller, or StatefulSet.
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Scale also allows users to specify one or more preconditions for the scale action.
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If --current-replicas or --resource-version is specified, it is validated before the
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scale is attempted, and it is guaranteed that the precondition holds true when the
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scale is sent to the server.`))
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scaleExample = templates.Examples(i18n.T(`
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# Scale a replicaset named 'foo' to 3.
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kubectl scale --replicas=3 rs/foo
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# Scale a resource identified by type and name specified in "foo.yaml" to 3.
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kubectl scale --replicas=3 -f foo.yaml
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# If the deployment named mysql's current size is 2, scale mysql to 3.
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kubectl scale --current-replicas=2 --replicas=3 deployment/mysql
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# Scale multiple replication controllers.
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kubectl scale --replicas=5 rc/foo rc/bar rc/baz
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# Scale statefulset named 'web' to 3.
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kubectl scale --replicas=3 statefulset/web`))
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)
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type ScaleOptions struct {
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FilenameOptions resource.FilenameOptions
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RecordFlags *genericclioptions.RecordFlags
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PrintFlags *genericclioptions.PrintFlags
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PrintObj printers.ResourcePrinterFunc
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Selector string
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All bool
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Replicas int
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ResourceVersion string
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CurrentReplicas int
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Timeout time.Duration
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Recorder genericclioptions.Recorder
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builder *resource.Builder
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namespace string
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enforceNamespace bool
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args []string
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shortOutput bool
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clientSet kubernetes.Interface
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scaler scale.Scaler
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unstructuredClientForMapping func(mapping *meta.RESTMapping) (resource.RESTClient, error)
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parent string
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dryRunStrategy cmdutil.DryRunStrategy
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dryRunVerifier *resource.DryRunVerifier
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genericclioptions.IOStreams
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}
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func NewScaleOptions(ioStreams genericclioptions.IOStreams) *ScaleOptions {
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return &ScaleOptions{
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PrintFlags: genericclioptions.NewPrintFlags("scaled"),
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RecordFlags: genericclioptions.NewRecordFlags(),
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CurrentReplicas: -1,
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Recorder: genericclioptions.NoopRecorder{},
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IOStreams: ioStreams,
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}
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}
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// NewCmdScale returns a cobra command with the appropriate configuration and flags to run scale
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func NewCmdScale(f cmdutil.Factory, ioStreams genericclioptions.IOStreams) *cobra.Command {
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o := NewScaleOptions(ioStreams)
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validArgs := []string{"deployment", "replicaset", "replicationcontroller", "statefulset"}
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cmd := &cobra.Command{
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Use: "scale [--resource-version=version] [--current-replicas=count] --replicas=COUNT (-f FILENAME | TYPE NAME)",
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DisableFlagsInUseLine: true,
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Short: i18n.T("Set a new size for a Deployment, ReplicaSet or Replication Controller"),
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Long: scaleLong,
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Example: scaleExample,
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Run: func(cmd *cobra.Command, args []string) {
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cmdutil.CheckErr(o.Complete(f, cmd, args))
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cmdutil.CheckErr(o.Validate(cmd))
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cmdutil.CheckErr(o.RunScale())
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},
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ValidArgs: validArgs,
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}
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o.RecordFlags.AddFlags(cmd)
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o.PrintFlags.AddFlags(cmd)
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cmd.Flags().StringVarP(&o.Selector, "selector", "l", o.Selector, "Selector (label query) to filter on, supports '=', '==', and '!='.(e.g. -l key1=value1,key2=value2)")
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cmd.Flags().BoolVar(&o.All, "all", o.All, "Select all resources in the namespace of the specified resource types")
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cmd.Flags().StringVar(&o.ResourceVersion, "resource-version", o.ResourceVersion, i18n.T("Precondition for resource version. Requires that the current resource version match this value in order to scale."))
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cmd.Flags().IntVar(&o.CurrentReplicas, "current-replicas", o.CurrentReplicas, "Precondition for current size. Requires that the current size of the resource match this value in order to scale.")
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cmd.Flags().IntVar(&o.Replicas, "replicas", o.Replicas, "The new desired number of replicas. Required.")
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cmd.MarkFlagRequired("replicas")
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cmd.Flags().DurationVar(&o.Timeout, "timeout", 0, "The length of time to wait before giving up on a scale operation, zero means don't wait. Any other values should contain a corresponding time unit (e.g. 1s, 2m, 3h).")
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cmdutil.AddFilenameOptionFlags(cmd, &o.FilenameOptions, "identifying the resource to set a new size")
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cmdutil.AddDryRunFlag(cmd)
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return cmd
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}
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func (o *ScaleOptions) Complete(f cmdutil.Factory, cmd *cobra.Command, args []string) error {
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var err error
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o.RecordFlags.Complete(cmd)
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o.Recorder, err = o.RecordFlags.ToRecorder()
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if err != nil {
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return err
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}
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printer, err := o.PrintFlags.ToPrinter()
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if err != nil {
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return err
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}
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o.PrintObj = printer.PrintObj
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o.dryRunStrategy, err = cmdutil.GetDryRunStrategy(cmd)
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if err != nil {
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return err
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}
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dynamicClient, err := f.DynamicClient()
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if err != nil {
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return err
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}
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discoveryClient, err := f.ToDiscoveryClient()
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if err != nil {
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return err
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}
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o.dryRunVerifier = resource.NewDryRunVerifier(dynamicClient, discoveryClient)
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o.namespace, o.enforceNamespace, err = f.ToRawKubeConfigLoader().Namespace()
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if err != nil {
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return err
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}
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o.builder = f.NewBuilder()
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o.args = args
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o.shortOutput = cmdutil.GetFlagString(cmd, "output") == "name"
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o.clientSet, err = f.KubernetesClientSet()
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if err != nil {
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return err
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}
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o.scaler, err = scaler(f)
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if err != nil {
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return err
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}
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o.unstructuredClientForMapping = f.UnstructuredClientForMapping
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o.parent = cmd.Parent().Name()
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return nil
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}
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func (o *ScaleOptions) Validate(cmd *cobra.Command) error {
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if o.Replicas < 0 {
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return fmt.Errorf("The --replicas=COUNT flag is required, and COUNT must be greater than or equal to 0")
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}
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return nil
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}
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// RunScale executes the scaling
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func (o *ScaleOptions) RunScale() error {
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r := o.builder.
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Unstructured().
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ContinueOnError().
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NamespaceParam(o.namespace).DefaultNamespace().
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FilenameParam(o.enforceNamespace, &o.FilenameOptions).
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ResourceTypeOrNameArgs(o.All, o.args...).
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Flatten().
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LabelSelectorParam(o.Selector).
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Do()
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err := r.Err()
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if err != nil {
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return err
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}
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infos := []*resource.Info{}
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err = r.Visit(func(info *resource.Info, err error) error {
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if err == nil {
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infos = append(infos, info)
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}
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return nil
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})
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if len(o.ResourceVersion) != 0 && len(infos) > 1 {
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return fmt.Errorf("cannot use --resource-version with multiple resources")
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}
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// only set a precondition if the user has requested one. A nil precondition means we can do a blind update, so
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// we avoid a Scale GET that may or may not succeed
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var precondition *scale.ScalePrecondition
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if o.CurrentReplicas != -1 || len(o.ResourceVersion) > 0 {
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precondition = &scale.ScalePrecondition{Size: o.CurrentReplicas, ResourceVersion: o.ResourceVersion}
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}
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retry := scale.NewRetryParams(1*time.Second, 5*time.Minute)
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var waitForReplicas *scale.RetryParams
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if o.Timeout != 0 && o.dryRunStrategy == cmdutil.DryRunNone {
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waitForReplicas = scale.NewRetryParams(1*time.Second, o.Timeout)
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}
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counter := 0
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err = r.Visit(func(info *resource.Info, err error) error {
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if err != nil {
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return err
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}
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counter++
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mapping := info.ResourceMapping()
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if o.dryRunStrategy == cmdutil.DryRunClient {
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return o.PrintObj(info.Object, o.Out)
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}
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if err := o.scaler.Scale(info.Namespace, info.Name, uint(o.Replicas), precondition, retry, waitForReplicas, mapping.Resource, o.dryRunStrategy == cmdutil.DryRunServer); err != nil {
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return err
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}
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// if the recorder makes a change, compute and create another patch
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if mergePatch, err := o.Recorder.MakeRecordMergePatch(info.Object); err != nil {
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klog.V(4).Infof("error recording current command: %v", err)
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} else if len(mergePatch) > 0 {
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client, err := o.unstructuredClientForMapping(mapping)
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if err != nil {
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return err
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}
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helper := resource.NewHelper(client, mapping)
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if _, err := helper.Patch(info.Namespace, info.Name, types.MergePatchType, mergePatch, nil); err != nil {
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klog.V(4).Infof("error recording reason: %v", err)
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}
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}
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return o.PrintObj(info.Object, o.Out)
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})
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if err != nil {
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return err
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}
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if counter == 0 {
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return fmt.Errorf("no objects passed to scale")
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}
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return nil
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}
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func scaler(f cmdutil.Factory) (scale.Scaler, error) {
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scalesGetter, err := cmdutil.ScaleClientFn(f)
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if err != nil {
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return nil, err
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}
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return scale.NewScaler(scalesGetter), nil
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}
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