mirror of
https://github.com/k3s-io/k3s.git
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303 lines
9.6 KiB
Go
303 lines
9.6 KiB
Go
/*
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Copyright 2015 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 autoscale
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import (
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"context"
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"fmt"
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"github.com/spf13/cobra"
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"k8s.io/klog/v2"
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autoscalingv1 "k8s.io/api/autoscaling/v1"
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"k8s.io/apimachinery/pkg/api/meta"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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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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autoscalingv1client "k8s.io/client-go/kubernetes/typed/autoscaling/v1"
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"k8s.io/client-go/scale"
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cmdutil "k8s.io/kubectl/pkg/cmd/util"
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"k8s.io/kubectl/pkg/scheme"
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"k8s.io/kubectl/pkg/util"
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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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autoscaleLong = templates.LongDesc(i18n.T(`
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Creates an autoscaler that automatically chooses and sets the number of pods that run in a kubernetes cluster.
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Looks up a Deployment, ReplicaSet, StatefulSet, or ReplicationController by name and creates an autoscaler that uses the given resource as a reference.
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An autoscaler can automatically increase or decrease number of pods deployed within the system as needed.`))
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autoscaleExample = templates.Examples(i18n.T(`
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# Auto scale a deployment "foo", with the number of pods between 2 and 10, no target CPU utilization specified so a default autoscaling policy will be used:
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kubectl autoscale deployment foo --min=2 --max=10
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# Auto scale a replication controller "foo", with the number of pods between 1 and 5, target CPU utilization at 80%:
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kubectl autoscale rc foo --max=5 --cpu-percent=80`))
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)
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// AutoscaleOptions declares the arguments accepted by the Autoscale command
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type AutoscaleOptions struct {
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FilenameOptions *resource.FilenameOptions
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RecordFlags *genericclioptions.RecordFlags
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Recorder genericclioptions.Recorder
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PrintFlags *genericclioptions.PrintFlags
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ToPrinter func(string) (printers.ResourcePrinter, error)
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Name string
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Min int32
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Max int32
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CPUPercent int32
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createAnnotation bool
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args []string
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enforceNamespace bool
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namespace string
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dryRunStrategy cmdutil.DryRunStrategy
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dryRunVerifier *resource.DryRunVerifier
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builder *resource.Builder
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fieldManager string
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HPAClient autoscalingv1client.HorizontalPodAutoscalersGetter
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scaleKindResolver scale.ScaleKindResolver
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genericclioptions.IOStreams
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}
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// NewAutoscaleOptions creates the options for autoscale
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func NewAutoscaleOptions(ioStreams genericclioptions.IOStreams) *AutoscaleOptions {
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return &AutoscaleOptions{
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PrintFlags: genericclioptions.NewPrintFlags("autoscaled").WithTypeSetter(scheme.Scheme),
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FilenameOptions: &resource.FilenameOptions{},
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RecordFlags: genericclioptions.NewRecordFlags(),
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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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// NewCmdAutoscale returns the autoscale Cobra command
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func NewCmdAutoscale(f cmdutil.Factory, ioStreams genericclioptions.IOStreams) *cobra.Command {
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o := NewAutoscaleOptions(ioStreams)
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validArgs := []string{"deployment", "replicaset", "replicationcontroller"}
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cmd := &cobra.Command{
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Use: "autoscale (-f FILENAME | TYPE NAME | TYPE/NAME) [--min=MINPODS] --max=MAXPODS [--cpu-percent=CPU]",
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DisableFlagsInUseLine: true,
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Short: i18n.T("Auto-scale a Deployment, ReplicaSet, or ReplicationController"),
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Long: autoscaleLong,
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Example: autoscaleExample,
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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())
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cmdutil.CheckErr(o.Run())
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},
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ValidArgs: validArgs,
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}
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// bind flag structs
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o.RecordFlags.AddFlags(cmd)
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o.PrintFlags.AddFlags(cmd)
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cmd.Flags().String("generator", "horizontalpodautoscaler/v1", i18n.T("The name of the API generator to use. Currently there is only 1 generator."))
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cmd.Flags().MarkDeprecated("generator", "has no effect and will be removed in the future.")
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cmd.Flags().Int32Var(&o.Min, "min", -1, "The lower limit for the number of pods that can be set by the autoscaler. If it's not specified or negative, the server will apply a default value.")
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cmd.Flags().Int32Var(&o.Max, "max", -1, "The upper limit for the number of pods that can be set by the autoscaler. Required.")
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cmd.MarkFlagRequired("max")
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cmd.Flags().Int32Var(&o.CPUPercent, "cpu-percent", -1, fmt.Sprintf("The target average CPU utilization (represented as a percent of requested CPU) over all the pods. If it's not specified or negative, a default autoscaling policy will be used."))
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cmd.Flags().StringVar(&o.Name, "name", "", i18n.T("The name for the newly created object. If not specified, the name of the input resource will be used."))
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cmdutil.AddDryRunFlag(cmd)
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cmdutil.AddFilenameOptionFlags(cmd, o.FilenameOptions, "identifying the resource to autoscale.")
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cmdutil.AddApplyAnnotationFlags(cmd)
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cmdutil.AddFieldManagerFlagVar(cmd, &o.fieldManager, "kubectl-autoscale")
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return cmd
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}
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// Complete verifies command line arguments and loads data from the command environment
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func (o *AutoscaleOptions) Complete(f cmdutil.Factory, cmd *cobra.Command, args []string) error {
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var err error
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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.createAnnotation = cmdutil.GetFlagBool(cmd, cmdutil.ApplyAnnotationsFlag)
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o.builder = f.NewBuilder()
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o.scaleKindResolver = scale.NewDiscoveryScaleKindResolver(discoveryClient)
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o.args = args
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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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kubeClient, 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.HPAClient = kubeClient.AutoscalingV1()
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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.ToPrinter = func(operation string) (printers.ResourcePrinter, error) {
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o.PrintFlags.NamePrintFlags.Operation = operation
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cmdutil.PrintFlagsWithDryRunStrategy(o.PrintFlags, o.dryRunStrategy)
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return o.PrintFlags.ToPrinter()
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}
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return nil
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}
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// Validate checks that the provided attach options are specified.
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func (o *AutoscaleOptions) Validate() error {
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if o.Max < 1 {
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return fmt.Errorf("--max=MAXPODS is required and must be at least 1, max: %d", o.Max)
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}
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if o.Max < o.Min {
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return fmt.Errorf("--max=MAXPODS must be larger or equal to --min=MINPODS, max: %d, min: %d", o.Max, o.Min)
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}
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return nil
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}
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// Run performs the execution
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func (o *AutoscaleOptions) Run() 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(false, o.args...).
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Flatten().
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Do()
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if err := r.Err(); err != nil {
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return err
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}
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count := 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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mapping := info.ResourceMapping()
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gvr := mapping.GroupVersionKind.GroupVersion().WithResource(mapping.Resource.Resource)
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if _, err := o.scaleKindResolver.ScaleForResource(gvr); err != nil {
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return fmt.Errorf("cannot autoscale a %v: %v", mapping.GroupVersionKind.Kind, err)
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}
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hpa := o.createHorizontalPodAutoscaler(info.Name, mapping)
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if err := o.Recorder.Record(hpa); err != nil {
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klog.V(4).Infof("error recording current command: %v", err)
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}
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if o.dryRunStrategy == cmdutil.DryRunClient {
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count++
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printer, err := o.ToPrinter("created")
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if err != nil {
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return err
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}
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return printer.PrintObj(hpa, o.Out)
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}
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if err := util.CreateOrUpdateAnnotation(o.createAnnotation, hpa, scheme.DefaultJSONEncoder()); err != nil {
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return err
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}
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createOptions := metav1.CreateOptions{}
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if o.fieldManager != "" {
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createOptions.FieldManager = o.fieldManager
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}
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if o.dryRunStrategy == cmdutil.DryRunServer {
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if err := o.dryRunVerifier.HasSupport(hpa.GroupVersionKind()); err != nil {
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return err
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}
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createOptions.DryRun = []string{metav1.DryRunAll}
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}
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actualHPA, err := o.HPAClient.HorizontalPodAutoscalers(o.namespace).Create(context.TODO(), hpa, createOptions)
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if err != nil {
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return err
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}
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count++
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printer, err := o.ToPrinter("autoscaled")
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if err != nil {
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return err
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}
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return printer.PrintObj(actualHPA, 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 count == 0 {
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return fmt.Errorf("no objects passed to autoscale")
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}
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return nil
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}
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func (o *AutoscaleOptions) createHorizontalPodAutoscaler(refName string, mapping *meta.RESTMapping) *autoscalingv1.HorizontalPodAutoscaler {
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name := o.Name
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if len(name) == 0 {
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name = refName
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}
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scaler := autoscalingv1.HorizontalPodAutoscaler{
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ObjectMeta: metav1.ObjectMeta{
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Name: name,
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},
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Spec: autoscalingv1.HorizontalPodAutoscalerSpec{
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ScaleTargetRef: autoscalingv1.CrossVersionObjectReference{
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APIVersion: mapping.GroupVersionKind.GroupVersion().String(),
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Kind: mapping.GroupVersionKind.Kind,
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Name: refName,
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},
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MaxReplicas: o.Max,
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},
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}
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if o.Min > 0 {
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v := int32(o.Min)
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scaler.Spec.MinReplicas = &v
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}
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if o.CPUPercent >= 0 {
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c := int32(o.CPUPercent)
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scaler.Spec.TargetCPUUtilizationPercentage = &c
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}
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return &scaler
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}
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