544 lines
19 KiB
Go
544 lines
19 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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"strconv"
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"strings"
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"github.com/spf13/cobra"
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autoscalingv1 "k8s.io/api/autoscaling/v1"
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autoscalingv2 "k8s.io/api/autoscaling/v2"
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corev1 "k8s.io/api/core/v1"
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"k8s.io/apimachinery/pkg/api/meta"
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apiresource "k8s.io/apimachinery/pkg/api/resource"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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"k8s.io/apimachinery/pkg/runtime"
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"k8s.io/cli-runtime/pkg/genericclioptions"
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"k8s.io/cli-runtime/pkg/genericiooptions"
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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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autoscalingv2client "k8s.io/client-go/kubernetes/typed/autoscaling/v2"
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"k8s.io/client-go/scale"
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"k8s.io/klog/v2"
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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/completion"
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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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The command will attempt to use the autoscaling/v2 API first, in case of an error, it will fall back to autoscaling/v1 API.
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Looks up a deployment, replica set, stateful set, or replication controller 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=80%
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# Auto scale a deployment "bar", with the number of pods between 3 and 6, target average CPU of 500m and memory of 200Mi
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kubectl autoscale deployment bar --min=3 --max=6 --cpu=500m --memory=200Mi
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# Auto scale a deployment "bar", with the number of pods between 2 and 8, target CPU utilization 60% and memory utilization 70%
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kubectl autoscale deployment bar --min=3 --max=6 --cpu=60% --memory=70%`))
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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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CPU string
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Memory string
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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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builder *resource.Builder
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fieldManager string
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HPAClientV1 autoscalingv1client.HorizontalPodAutoscalersGetter
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HPAClientV2 autoscalingv2client.HorizontalPodAutoscalersGetter
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scaleKindResolver scale.ScaleKindResolver
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genericiooptions.IOStreams
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}
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// NewAutoscaleOptions creates the options for autoscale
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func NewAutoscaleOptions(ioStreams genericiooptions.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 genericiooptions.IOStreams) *cobra.Command {
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o := NewAutoscaleOptions(ioStreams)
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validArgs := []string{"deployment", "replicaset", "replicationcontroller", "statefulset"}
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cmd := &cobra.Command{
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Use: "autoscale (-f FILENAME | TYPE NAME | TYPE/NAME) [--min=MINPODS] --max=MAXPODS [--cpu=CPU] [--memory=MEMORY]",
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DisableFlagsInUseLine: true,
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Short: i18n.T("Auto-scale a deployment, replica set, stateful set, or replication controller"),
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Long: autoscaleLong,
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Example: autoscaleExample,
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ValidArgsFunction: completion.SpecifiedResourceTypeAndNameCompletionFunc(f, validArgs),
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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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}
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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().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, "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.CPU, "cpu", "", `Target CPU utilization over all the pods. When specified as a percentage (e.g."70%" for 70% of requested CPU) it will target average utilization. When specified as quantity (e.g."500m" for 500 milliCPU) it will target average value. Value without units is treated as a quantity with miliCPU being the unit (e.g."500" is "500m").`)
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cmd.Flags().StringVar(&o.Memory, "memory", "", `Target memory utilization over all the pods. When specified as a percentage (e.g."60%" for 60% of requested memory) it will target average utilization. When specified as quantity (e.g."200Mi" for 200 MiB, "1Gi" for 1 GiB) it will target average value. Value without units is treated as a quantity with mebibytes being the unit (e.g."200" is "200Mi").`)
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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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_ = cmd.Flags().MarkDeprecated("cpu-percent",
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"Use --cpu with percentage or resource quantity format (e.g., '70%' for utilization or '500m' for milliCPU).")
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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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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.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.HPAClientV2 = kubeClient.AutoscalingV2()
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o.HPAClientV1 = 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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// only one of the CPUPercent or CPU param is allowed
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if o.CPUPercent > 0 && o.CPU != "" {
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return fmt.Errorf("--cpu-percent and --cpu are mutually exclusive")
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}
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// validate CPU target if specified
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if o.CPU != "" {
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if _, _, _, err := parseResourceInput(o.CPU, corev1.ResourceCPU); err != nil {
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return err
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}
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}
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// validate Memory target if specified
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if o.Memory != "" {
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if _, _, _, err := parseResourceInput(o.Memory, corev1.ResourceMemory); err != nil {
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return err
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}
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}
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return nil
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}
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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 %s: %w", mapping.GroupVersionKind.Kind, err)
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}
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// handles the creation of HorizontalPodAutoscaler objects for both autoscaling/v2 and autoscaling/v1 APIs.
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// If autoscaling/v2 API fails, try to create and handle HorizontalPodAutoscaler using autoscaling/v1 API
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var hpaV2 runtime.Object
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hpaV2, err = o.createHorizontalPodAutoscalerV2(info.Name, mapping)
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if err != nil {
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return fmt.Errorf("failed to create HorizontalPodAutoscaler using autoscaling/v2 API: %w", err)
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}
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if err = o.handleHPA(hpaV2); err != nil {
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klog.V(1).Infof("Encountered an error with the autoscaling/v2 HorizontalPodAutoscaler: %v. "+
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"Falling back to try the autoscaling/v1 HorizontalPodAutoscaler", err)
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// check if the HPA can be created using v1 API.
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if ok, err := o.canCreateHPAV1(); !ok {
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return fmt.Errorf("failed to create autoscaling/v2 HPA and the configuration is incompatible with autoscaling/v1: %w", err)
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}
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hpaV1 := o.createHorizontalPodAutoscalerV1(info.Name, mapping)
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if err := o.handleHPA(hpaV1); err != nil {
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return err
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}
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}
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count++
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return nil
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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) canCreateHPAV1() (bool, error) {
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// Allow fallback to v1 HPA only if:
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// 1. CPUPercent is set and Memory is not set.
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// 2. Or, Memory is not set and the metric type is UtilizationMetricType.
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_, _, metricsType, err := parseResourceInput(o.CPU, corev1.ResourceCPU)
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if err != nil {
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return false, err
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}
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return (o.CPUPercent >= 0 && o.Memory == "") ||
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(o.Memory == "" && metricsType == autoscalingv2.UtilizationMetricType), nil
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}
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// handleHPA handles the creation and management of a single HPA object.
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func (o *AutoscaleOptions) handleHPA(hpa runtime.Object) error {
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if err := o.Recorder.Record(hpa); err != nil {
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return fmt.Errorf("error recording current command: %w", err)
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}
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if o.dryRunStrategy == cmdutil.DryRunClient {
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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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createOptions.DryRun = []string{metav1.DryRunAll}
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}
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var actualHPA runtime.Object
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var err error
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switch typedHPA := hpa.(type) {
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case *autoscalingv2.HorizontalPodAutoscaler:
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actualHPA, err = o.HPAClientV2.HorizontalPodAutoscalers(o.namespace).Create(context.TODO(), typedHPA, createOptions)
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case *autoscalingv1.HorizontalPodAutoscaler:
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actualHPA, err = o.HPAClientV1.HorizontalPodAutoscalers(o.namespace).Create(context.TODO(), typedHPA, createOptions)
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default:
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return fmt.Errorf("unsupported HorizontalPodAutoscaler type %T", hpa)
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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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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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func (o *AutoscaleOptions) createHorizontalPodAutoscalerV2(refName string, mapping *meta.RESTMapping) (*autoscalingv2.HorizontalPodAutoscaler, error) {
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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 := autoscalingv2.HorizontalPodAutoscaler{
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ObjectMeta: metav1.ObjectMeta{
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Name: name,
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},
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Spec: autoscalingv2.HorizontalPodAutoscalerSpec{
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ScaleTargetRef: autoscalingv2.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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scaler.Spec.MinReplicas = &o.Min
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}
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metrics := []autoscalingv2.MetricSpec{}
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// add CPU metric if any of the CPU targets are specified
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if o.CPUPercent > 0 {
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cpuMetric := autoscalingv2.MetricSpec{
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Type: autoscalingv2.ResourceMetricSourceType,
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Resource: &autoscalingv2.ResourceMetricSource{
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Name: corev1.ResourceCPU,
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Target: autoscalingv2.MetricTarget{},
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},
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}
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cpuMetric.Resource.Target.Type = autoscalingv2.UtilizationMetricType
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cpuMetric.Resource.Target.AverageUtilization = &o.CPUPercent
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metrics = append(metrics, cpuMetric)
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}
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// add Cpu metric if any of the cpu targets are specified
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if o.CPU != "" {
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cpuMetric := autoscalingv2.MetricSpec{
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Type: autoscalingv2.ResourceMetricSourceType,
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Resource: &autoscalingv2.ResourceMetricSource{
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Name: corev1.ResourceCPU,
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Target: autoscalingv2.MetricTarget{},
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},
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}
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quantity, value, metricsType, err := parseResourceInput(o.CPU, corev1.ResourceCPU)
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if err != nil {
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return nil, err
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}
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switch metricsType {
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case autoscalingv2.UtilizationMetricType:
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cpuMetric.Resource.Target.Type = autoscalingv2.UtilizationMetricType
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cpuMetric.Resource.Target.AverageUtilization = &value
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case autoscalingv2.AverageValueMetricType:
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cpuMetric.Resource.Target.Type = autoscalingv2.AverageValueMetricType
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cpuMetric.Resource.Target.AverageValue = &quantity
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default:
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return nil, fmt.Errorf("unsupported metric type: %v", metricsType)
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}
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metrics = append(metrics, cpuMetric)
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}
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// add Memory metric if any of the memory targets are specified
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if o.Memory != "" {
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memoryMetric := autoscalingv2.MetricSpec{
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Type: autoscalingv2.ResourceMetricSourceType,
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Resource: &autoscalingv2.ResourceMetricSource{
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Name: corev1.ResourceMemory,
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Target: autoscalingv2.MetricTarget{},
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},
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}
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quantity, value, metricsType, err := parseResourceInput(o.Memory, corev1.ResourceMemory)
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if err != nil {
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return nil, err
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}
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switch metricsType {
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case autoscalingv2.UtilizationMetricType:
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memoryMetric.Resource.Target.Type = autoscalingv2.UtilizationMetricType
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memoryMetric.Resource.Target.AverageUtilization = &value
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case autoscalingv2.AverageValueMetricType:
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memoryMetric.Resource.Target.Type = autoscalingv2.AverageValueMetricType
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memoryMetric.Resource.Target.AverageValue = &quantity
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default:
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return nil, fmt.Errorf("unsupported metric type: %v", metricsType)
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}
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metrics = append(metrics, memoryMetric)
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}
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// Only set Metrics if there are any defined
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if len(metrics) > 0 {
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scaler.Spec.Metrics = metrics
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} else {
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scaler.Spec.Metrics = nil
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}
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return &scaler, nil
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}
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func (o *AutoscaleOptions) createHorizontalPodAutoscalerV1(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(),
|
|
Kind: mapping.GroupVersionKind.Kind,
|
|
Name: refName,
|
|
},
|
|
MaxReplicas: o.Max,
|
|
},
|
|
}
|
|
|
|
if o.Min > 0 {
|
|
v := int32(o.Min)
|
|
scaler.Spec.MinReplicas = &v
|
|
}
|
|
if o.CPUPercent >= 0 {
|
|
c := int32(o.CPUPercent)
|
|
scaler.Spec.TargetCPUUtilizationPercentage = &c
|
|
}
|
|
|
|
return &scaler
|
|
}
|
|
|
|
// parseResourceInput parses a resource input string into either a utilization percentage or a quantity value.
|
|
// It supports:
|
|
// - Percentage values (e.g., "70%") for UtilizationMetricType
|
|
// - Quantity values with units (e.g., "500m", "2Gi")
|
|
// - Bare numbers without units, which are interpreted as:
|
|
// - CPU: milliCPU ("500" → "500m")
|
|
// - Memory: Mebibytes ("512" → "512Mi")
|
|
func parseResourceInput(input string, resourceType corev1.ResourceName) (apiresource.Quantity, int32, autoscalingv2.MetricTargetType, error) {
|
|
input = strings.TrimSpace(input)
|
|
if input == "" {
|
|
return apiresource.Quantity{}, 0, "", fmt.Errorf("empty input")
|
|
}
|
|
|
|
// Case 1: Handle percentage-based metrics like "70%"
|
|
percentValue, isPercent, err := parsePercentage(input)
|
|
if isPercent {
|
|
if err != nil {
|
|
return apiresource.Quantity{}, 0, "", err
|
|
}
|
|
return apiresource.Quantity{}, percentValue, autoscalingv2.UtilizationMetricType, nil
|
|
}
|
|
|
|
// Case 2: Try to interpret input as a bare number (e.g., "500"), and apply default float
|
|
valueFloat, err := strconv.ParseFloat(input, 64)
|
|
if err == nil {
|
|
unit, err := getDefaultUnitForResource(resourceType)
|
|
if err != nil {
|
|
return apiresource.Quantity{}, 0, "", err
|
|
}
|
|
|
|
inputWithUnit := fmt.Sprintf("%g%s", valueFloat, unit)
|
|
quantity, err := apiresource.ParseQuantity(inputWithUnit)
|
|
if err != nil {
|
|
return apiresource.Quantity{}, 0, "", err
|
|
}
|
|
return quantity, 0, autoscalingv2.AverageValueMetricType, nil
|
|
}
|
|
|
|
// Case 3: Parse normally if input has a valid unit (e.g., "500m", "2Gi")
|
|
quantity, err := apiresource.ParseQuantity(input)
|
|
if err != nil {
|
|
return apiresource.Quantity{}, 0, "", fmt.Errorf("invalid resource %s value: %s", resourceType, input)
|
|
}
|
|
return quantity, 0, autoscalingv2.AverageValueMetricType, nil
|
|
}
|
|
|
|
func getDefaultUnitForResource(resourceType corev1.ResourceName) (string, error) {
|
|
switch resourceType {
|
|
case corev1.ResourceCPU:
|
|
return "m", nil
|
|
case corev1.ResourceMemory:
|
|
return "Mi", nil
|
|
default:
|
|
return "", fmt.Errorf("unsupported resource type: %v", resourceType)
|
|
}
|
|
}
|
|
|
|
func parsePercentage(input string) (int32, bool, error) {
|
|
if !strings.HasSuffix(input, "%") {
|
|
return 0, false, nil
|
|
}
|
|
trimmed := strings.TrimSuffix(input, "%")
|
|
valueInt64, err := strconv.ParseInt(trimmed, 10, 32)
|
|
if err != nil || valueInt64 < 0 {
|
|
return 0, true, fmt.Errorf("invalid percentage value: %s", trimmed)
|
|
}
|
|
return int32(valueInt64), true, nil
|
|
}
|