203 lines
6.9 KiB
Go
203 lines
6.9 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 cmd
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import (
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"fmt"
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"io"
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utilerrors "k8s.io/apimachinery/pkg/util/errors"
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"k8s.io/kubernetes/pkg/kubectl"
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"k8s.io/kubernetes/pkg/kubectl/cmd/templates"
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cmdutil "k8s.io/kubernetes/pkg/kubectl/cmd/util"
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"k8s.io/kubernetes/pkg/kubectl/resource"
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"github.com/spf13/cobra"
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)
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var (
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autoscaleLong = templates.LongDesc(`
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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, 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(`
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# Auto scale a deployment "foo", with the number of pods between 2 and 10, 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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func NewCmdAutoscale(f cmdutil.Factory, out io.Writer) *cobra.Command {
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options := &resource.FilenameOptions{}
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validArgs := []string{"deployment", "replicaset", "replicationcontroller"}
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argAliases := kubectl.ResourceAliases(validArgs)
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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] [flags]",
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Short: "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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err := RunAutoscale(f, out, cmd, args, options)
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cmdutil.CheckErr(err)
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},
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ValidArgs: validArgs,
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ArgAliases: argAliases,
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}
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cmdutil.AddPrinterFlags(cmd)
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cmd.Flags().String("generator", "horizontalpodautoscaler/v1", "The name of the API generator to use. Currently there is only 1 generator.")
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cmd.Flags().Int("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().Int("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().Int("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().String("name", "", "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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usage := "identifying the resource to autoscale."
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cmdutil.AddFilenameOptionFlags(cmd, options, usage)
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cmdutil.AddApplyAnnotationFlags(cmd)
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cmdutil.AddRecordFlag(cmd)
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cmdutil.AddInclude3rdPartyFlags(cmd)
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return cmd
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}
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func RunAutoscale(f cmdutil.Factory, out io.Writer, cmd *cobra.Command, args []string, options *resource.FilenameOptions) error {
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namespace, enforceNamespace, err := f.DefaultNamespace()
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if err != nil {
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return err
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}
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// validate flags
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if err := validateFlags(cmd); err != nil {
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return err
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}
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mapper, typer := f.Object()
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r := resource.NewBuilder(mapper, typer, resource.ClientMapperFunc(f.ClientForMapping), f.Decoder(true)).
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ContinueOnError().
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NamespaceParam(namespace).DefaultNamespace().
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FilenameParam(enforceNamespace, options).
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ResourceTypeOrNameArgs(false, args...).
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Flatten().
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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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// Get the generator, setup and validate all required parameters
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generatorName := cmdutil.GetFlagString(cmd, "generator")
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generators := f.Generators("autoscale")
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generator, found := generators[generatorName]
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if !found {
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return cmdutil.UsageError(cmd, fmt.Sprintf("generator %q not found.", generatorName))
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}
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names := generator.ParamNames()
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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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if err := f.CanBeAutoscaled(mapping.GroupVersionKind.GroupKind()); err != nil {
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return err
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}
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name := info.Name
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params := kubectl.MakeParams(cmd, names)
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params["default-name"] = name
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params["scaleRef-kind"] = mapping.GroupVersionKind.Kind
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params["scaleRef-name"] = name
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params["scaleRef-apiVersion"] = mapping.GroupVersionKind.GroupVersion().String()
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if err = kubectl.ValidateParams(names, params); err != nil {
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return err
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}
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// Check for invalid flags used against the present generator.
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if err := kubectl.EnsureFlagsValid(cmd, generators, generatorName); err != nil {
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return err
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}
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// Generate new object
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object, err := generator.Generate(params)
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if err != nil {
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return err
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}
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resourceMapper := &resource.Mapper{
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ObjectTyper: typer,
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RESTMapper: mapper,
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ClientMapper: resource.ClientMapperFunc(f.ClientForMapping),
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Decoder: f.Decoder(true),
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}
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hpa, err := resourceMapper.InfoForObject(object, nil)
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if err != nil {
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return err
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}
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if cmdutil.ShouldRecord(cmd, hpa) {
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if err := cmdutil.RecordChangeCause(hpa.Object, f.Command()); err != nil {
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return err
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}
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object = hpa.Object
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}
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if cmdutil.GetDryRunFlag(cmd) {
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return f.PrintObject(cmd, mapper, object, out)
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}
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if err := kubectl.CreateOrUpdateAnnotation(cmdutil.GetFlagBool(cmd, cmdutil.ApplyAnnotationsFlag), hpa, f.JSONEncoder()); err != nil {
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return err
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}
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object, err = resource.NewHelper(hpa.Client, hpa.Mapping).Create(namespace, false, object)
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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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if len(cmdutil.GetFlagString(cmd, "output")) > 0 {
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return f.PrintObject(cmd, mapper, object, out)
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}
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cmdutil.PrintSuccess(mapper, false, out, info.Mapping.Resource, info.Name, cmdutil.GetDryRunFlag(cmd), "autoscaled")
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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 validateFlags(cmd *cobra.Command) error {
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errs := []error{}
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max, min := cmdutil.GetFlagInt(cmd, "max"), cmdutil.GetFlagInt(cmd, "min")
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if max < 1 {
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errs = append(errs, fmt.Errorf("--max=MAXPODS is required and must be at least 1, max: %d", max))
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}
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if max < min {
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errs = append(errs, fmt.Errorf("--max=MAXPODS must be larger or equal to --min=MINPODS, max: %d, min: %d", max, min))
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}
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return utilerrors.NewAggregate(errs)
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}
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