mirror of https://github.com/k3s-io/k3s
301 lines
9.8 KiB
Go
301 lines
9.8 KiB
Go
/*
|
|
Copyright 2015 The Kubernetes Authors.
|
|
|
|
Licensed under the Apache License, Version 2.0 (the "License");
|
|
you may not use this file except in compliance with the License.
|
|
You may obtain a copy of the License at
|
|
|
|
http://www.apache.org/licenses/LICENSE-2.0
|
|
|
|
Unless required by applicable law or agreed to in writing, software
|
|
distributed under the License is distributed on an "AS IS" BASIS,
|
|
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
See the License for the specific language governing permissions and
|
|
limitations under the License.
|
|
*/
|
|
|
|
package autoscale
|
|
|
|
import (
|
|
"context"
|
|
"fmt"
|
|
|
|
"github.com/spf13/cobra"
|
|
"k8s.io/klog"
|
|
|
|
autoscalingv1 "k8s.io/api/autoscaling/v1"
|
|
"k8s.io/apimachinery/pkg/api/meta"
|
|
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
|
|
"k8s.io/cli-runtime/pkg/genericclioptions"
|
|
"k8s.io/cli-runtime/pkg/printers"
|
|
"k8s.io/cli-runtime/pkg/resource"
|
|
autoscalingv1client "k8s.io/client-go/kubernetes/typed/autoscaling/v1"
|
|
"k8s.io/client-go/scale"
|
|
cmdutil "k8s.io/kubectl/pkg/cmd/util"
|
|
"k8s.io/kubectl/pkg/generate"
|
|
generateversioned "k8s.io/kubectl/pkg/generate/versioned"
|
|
"k8s.io/kubectl/pkg/scheme"
|
|
"k8s.io/kubectl/pkg/util"
|
|
"k8s.io/kubectl/pkg/util/i18n"
|
|
"k8s.io/kubectl/pkg/util/templates"
|
|
)
|
|
|
|
var (
|
|
autoscaleLong = templates.LongDesc(i18n.T(`
|
|
Creates an autoscaler that automatically chooses and sets the number of pods that run in a kubernetes cluster.
|
|
|
|
Looks up a Deployment, ReplicaSet, StatefulSet, or ReplicationController by name and creates an autoscaler that uses the given resource as a reference.
|
|
An autoscaler can automatically increase or decrease number of pods deployed within the system as needed.`))
|
|
|
|
autoscaleExample = templates.Examples(i18n.T(`
|
|
# 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:
|
|
kubectl autoscale deployment foo --min=2 --max=10
|
|
|
|
# Auto scale a replication controller "foo", with the number of pods between 1 and 5, target CPU utilization at 80%:
|
|
kubectl autoscale rc foo --max=5 --cpu-percent=80`))
|
|
)
|
|
|
|
// AutoscaleOptions declare the arguments accepted by the Autoscale command
|
|
type AutoscaleOptions struct {
|
|
FilenameOptions *resource.FilenameOptions
|
|
|
|
RecordFlags *genericclioptions.RecordFlags
|
|
Recorder genericclioptions.Recorder
|
|
|
|
PrintFlags *genericclioptions.PrintFlags
|
|
ToPrinter func(string) (printers.ResourcePrinter, error)
|
|
|
|
Name string
|
|
Generator string
|
|
Min int32
|
|
Max int32
|
|
CPUPercent int32
|
|
|
|
createAnnotation bool
|
|
args []string
|
|
enforceNamespace bool
|
|
namespace string
|
|
dryRunStrategy cmdutil.DryRunStrategy
|
|
dryRunVerifier *resource.DryRunVerifier
|
|
builder *resource.Builder
|
|
generatorFunc func(string, *meta.RESTMapping) (generate.StructuredGenerator, error)
|
|
|
|
HPAClient autoscalingv1client.HorizontalPodAutoscalersGetter
|
|
scaleKindResolver scale.ScaleKindResolver
|
|
|
|
genericclioptions.IOStreams
|
|
}
|
|
|
|
// NewAutoscaleOptions creates the options for autoscale
|
|
func NewAutoscaleOptions(ioStreams genericclioptions.IOStreams) *AutoscaleOptions {
|
|
return &AutoscaleOptions{
|
|
PrintFlags: genericclioptions.NewPrintFlags("autoscaled").WithTypeSetter(scheme.Scheme),
|
|
FilenameOptions: &resource.FilenameOptions{},
|
|
RecordFlags: genericclioptions.NewRecordFlags(),
|
|
Recorder: genericclioptions.NoopRecorder{},
|
|
|
|
IOStreams: ioStreams,
|
|
}
|
|
}
|
|
|
|
// NewCmdAutoscale returns the autoscale Cobra command
|
|
func NewCmdAutoscale(f cmdutil.Factory, ioStreams genericclioptions.IOStreams) *cobra.Command {
|
|
o := NewAutoscaleOptions(ioStreams)
|
|
|
|
validArgs := []string{"deployment", "replicaset", "replicationcontroller"}
|
|
|
|
cmd := &cobra.Command{
|
|
Use: "autoscale (-f FILENAME | TYPE NAME | TYPE/NAME) [--min=MINPODS] --max=MAXPODS [--cpu-percent=CPU]",
|
|
DisableFlagsInUseLine: true,
|
|
Short: i18n.T("Auto-scale a Deployment, ReplicaSet, or ReplicationController"),
|
|
Long: autoscaleLong,
|
|
Example: autoscaleExample,
|
|
Run: func(cmd *cobra.Command, args []string) {
|
|
cmdutil.CheckErr(o.Complete(f, cmd, args))
|
|
cmdutil.CheckErr(o.Validate())
|
|
cmdutil.CheckErr(o.Run())
|
|
},
|
|
ValidArgs: validArgs,
|
|
}
|
|
|
|
// bind flag structs
|
|
o.RecordFlags.AddFlags(cmd)
|
|
o.PrintFlags.AddFlags(cmd)
|
|
|
|
cmd.Flags().StringVar(&o.Generator, "generator", generateversioned.HorizontalPodAutoscalerV1GeneratorName, i18n.T("The name of the API generator to use. Currently there is only 1 generator."))
|
|
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.")
|
|
cmd.Flags().Int32Var(&o.Max, "max", -1, "The upper limit for the number of pods that can be set by the autoscaler. Required.")
|
|
cmd.MarkFlagRequired("max")
|
|
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."))
|
|
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."))
|
|
cmdutil.AddDryRunFlag(cmd)
|
|
cmdutil.AddFilenameOptionFlags(cmd, o.FilenameOptions, "identifying the resource to autoscale.")
|
|
cmdutil.AddApplyAnnotationFlags(cmd)
|
|
return cmd
|
|
}
|
|
|
|
// Complete verifies command line arguments and loads data from the command environment
|
|
func (o *AutoscaleOptions) Complete(f cmdutil.Factory, cmd *cobra.Command, args []string) error {
|
|
var err error
|
|
o.dryRunStrategy, err = cmdutil.GetDryRunStrategy(cmd)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
dynamicClient, err := f.DynamicClient()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
discoveryClient, err := f.ToDiscoveryClient()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
o.dryRunVerifier = resource.NewDryRunVerifier(dynamicClient, discoveryClient)
|
|
o.createAnnotation = cmdutil.GetFlagBool(cmd, cmdutil.ApplyAnnotationsFlag)
|
|
o.builder = f.NewBuilder()
|
|
o.scaleKindResolver = scale.NewDiscoveryScaleKindResolver(discoveryClient)
|
|
o.args = args
|
|
o.RecordFlags.Complete(cmd)
|
|
|
|
o.Recorder, err = o.RecordFlags.ToRecorder()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
kubeClient, err := f.KubernetesClientSet()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
o.HPAClient = kubeClient.AutoscalingV1()
|
|
|
|
// get the generator
|
|
o.generatorFunc = func(name string, mapping *meta.RESTMapping) (generate.StructuredGenerator, error) {
|
|
switch o.Generator {
|
|
case generateversioned.HorizontalPodAutoscalerV1GeneratorName:
|
|
return &generateversioned.HorizontalPodAutoscalerGeneratorV1{
|
|
Name: name,
|
|
MinReplicas: o.Min,
|
|
MaxReplicas: o.Max,
|
|
CPUPercent: o.CPUPercent,
|
|
ScaleRefName: name,
|
|
ScaleRefKind: mapping.GroupVersionKind.Kind,
|
|
ScaleRefAPIVersion: mapping.GroupVersionKind.GroupVersion().String(),
|
|
}, nil
|
|
default:
|
|
return nil, cmdutil.UsageErrorf(cmd, "Generator %s not supported. ", o.Generator)
|
|
}
|
|
}
|
|
|
|
o.namespace, o.enforceNamespace, err = f.ToRawKubeConfigLoader().Namespace()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
o.ToPrinter = func(operation string) (printers.ResourcePrinter, error) {
|
|
o.PrintFlags.NamePrintFlags.Operation = operation
|
|
cmdutil.PrintFlagsWithDryRunStrategy(o.PrintFlags, o.dryRunStrategy)
|
|
|
|
return o.PrintFlags.ToPrinter()
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
// Validate checks that the provided attach options are specified.
|
|
func (o *AutoscaleOptions) Validate() error {
|
|
if o.Max < 1 {
|
|
return fmt.Errorf("--max=MAXPODS is required and must be at least 1, max: %d", o.Max)
|
|
}
|
|
if o.Max < o.Min {
|
|
return fmt.Errorf("--max=MAXPODS must be larger or equal to --min=MINPODS, max: %d, min: %d", o.Max, o.Min)
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
// Run performs the execution
|
|
func (o *AutoscaleOptions) Run() error {
|
|
r := o.builder.
|
|
Unstructured().
|
|
ContinueOnError().
|
|
NamespaceParam(o.namespace).DefaultNamespace().
|
|
FilenameParam(o.enforceNamespace, o.FilenameOptions).
|
|
ResourceTypeOrNameArgs(false, o.args...).
|
|
Flatten().
|
|
Do()
|
|
if err := r.Err(); err != nil {
|
|
return err
|
|
}
|
|
|
|
count := 0
|
|
err := r.Visit(func(info *resource.Info, err error) error {
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
mapping := info.ResourceMapping()
|
|
gvr := mapping.GroupVersionKind.GroupVersion().WithResource(mapping.Resource.Resource)
|
|
if _, err := o.scaleKindResolver.ScaleForResource(gvr); err != nil {
|
|
return fmt.Errorf("cannot autoscale a %v: %v", mapping.GroupVersionKind.Kind, err)
|
|
}
|
|
|
|
generator, err := o.generatorFunc(info.Name, mapping)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
// Generate new object
|
|
object, err := generator.StructuredGenerate()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
hpa, ok := object.(*autoscalingv1.HorizontalPodAutoscaler)
|
|
if !ok {
|
|
return fmt.Errorf("generator made %T, not autoscalingv1.HorizontalPodAutoscaler", object)
|
|
}
|
|
|
|
if err := o.Recorder.Record(hpa); err != nil {
|
|
klog.V(4).Infof("error recording current command: %v", err)
|
|
}
|
|
|
|
if o.dryRunStrategy == cmdutil.DryRunClient {
|
|
count++
|
|
|
|
printer, err := o.ToPrinter("created")
|
|
if err != nil {
|
|
return err
|
|
}
|
|
return printer.PrintObj(hpa, o.Out)
|
|
}
|
|
|
|
if err := util.CreateOrUpdateAnnotation(o.createAnnotation, hpa, scheme.DefaultJSONEncoder()); err != nil {
|
|
return err
|
|
}
|
|
|
|
createOptions := metav1.CreateOptions{}
|
|
if o.dryRunStrategy == cmdutil.DryRunServer {
|
|
if err := o.dryRunVerifier.HasSupport(hpa.GroupVersionKind()); err != nil {
|
|
return err
|
|
}
|
|
createOptions.DryRun = []string{metav1.DryRunAll}
|
|
}
|
|
actualHPA, err := o.HPAClient.HorizontalPodAutoscalers(o.namespace).Create(context.TODO(), hpa, createOptions)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
count++
|
|
printer, err := o.ToPrinter("autoscaled")
|
|
if err != nil {
|
|
return err
|
|
}
|
|
return printer.PrintObj(actualHPA, o.Out)
|
|
})
|
|
if err != nil {
|
|
return err
|
|
}
|
|
if count == 0 {
|
|
return fmt.Errorf("no objects passed to autoscale")
|
|
}
|
|
return nil
|
|
}
|