mirror of
https://github.com/ceph/ceph-csi.git
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194 lines
6.5 KiB
Go
194 lines
6.5 KiB
Go
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/*
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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 cmd
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import (
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"fmt"
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"io"
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"github.com/spf13/cobra"
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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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"k8s.io/kubernetes/pkg/kubectl/util/i18n"
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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 Job.
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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 job named 'cron' to 3.
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kubectl scale --replicas=3 job/cron`))
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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, out io.Writer) *cobra.Command {
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options := &resource.FilenameOptions{}
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validArgs := []string{"deployment", "replicaset", "replicationcontroller", "job", "statefulset"}
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argAliases := kubectl.ResourceAliases(validArgs)
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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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Short: i18n.T("Set a new size for a Deployment, ReplicaSet, Replication Controller, or Job"),
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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(cmdutil.ValidateOutputArgs(cmd))
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shortOutput := cmdutil.GetFlagString(cmd, "output") == "name"
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err := RunScale(f, out, cmd, args, shortOutput, 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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cmd.Flags().StringP("selector", "l", "", "Selector (label query) to filter on, supports '=', '==', and '!='.(e.g. -l key1=value1,key2=value2)")
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cmd.Flags().Bool("all", false, "Select all resources in the namespace of the specified resource types")
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cmd.Flags().String("resource-version", "", 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().Int("current-replicas", -1, "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().Int("replicas", -1, "The new desired number of replicas. Required.")
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cmd.MarkFlagRequired("replicas")
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cmd.Flags().Duration("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.AddOutputFlagsForMutation(cmd)
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cmdutil.AddRecordFlag(cmd)
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cmdutil.AddInclude3rdPartyFlags(cmd)
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usage := "identifying the resource to set a new size"
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cmdutil.AddFilenameOptionFlags(cmd, options, usage)
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return cmd
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}
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// RunScale executes the scaling
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func RunScale(f cmdutil.Factory, out io.Writer, cmd *cobra.Command, args []string, shortOutput bool, options *resource.FilenameOptions) error {
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cmdNamespace, 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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selector := cmdutil.GetFlagString(cmd, "selector")
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all := cmdutil.GetFlagBool(cmd, "all")
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mapper, _ := f.Object()
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r := f.NewBuilder().
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Internal().
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ContinueOnError().
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NamespaceParam(cmdNamespace).DefaultNamespace().
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FilenameParam(enforceNamespace, options).
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ResourceTypeOrNameArgs(all, args...).
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Flatten().
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LabelSelectorParam(selector).
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Do()
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err = r.Err()
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if resource.IsUsageError(err) {
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return cmdutil.UsageErrorf(cmd, "%v", err)
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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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count := cmdutil.GetFlagInt(cmd, "replicas")
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if count < 0 {
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return cmdutil.UsageErrorf(cmd, "The --replicas=COUNT flag is required, and COUNT must be greater than or equal to 0")
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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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resourceVersion := cmdutil.GetFlagString(cmd, "resource-version")
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if len(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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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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mapping := info.ResourceMapping()
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scaler, err := f.Scaler(mapping)
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if err != nil {
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return err
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}
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currentSize := cmdutil.GetFlagInt(cmd, "current-replicas")
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precondition := &kubectl.ScalePrecondition{Size: currentSize, ResourceVersion: resourceVersion}
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retry := kubectl.NewRetryParams(kubectl.Interval, kubectl.Timeout)
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var waitForReplicas *kubectl.RetryParams
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if timeout := cmdutil.GetFlagDuration(cmd, "timeout"); timeout != 0 {
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waitForReplicas = kubectl.NewRetryParams(kubectl.Interval, timeout)
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}
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if err := scaler.Scale(info.Namespace, info.Name, uint(count), precondition, retry, waitForReplicas); err != nil {
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return err
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}
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if cmdutil.ShouldRecord(cmd, info) {
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patchBytes, patchType, err := cmdutil.ChangeResourcePatch(info, f.Command(cmd, true))
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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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client, err := f.ClientForMapping(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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_, err = helper.Patch(info.Namespace, info.Name, patchType, patchBytes)
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if err != nil {
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return err
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}
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}
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counter++
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f.PrintSuccess(mapper, shortOutput, out, info.Mapping.Resource, info.Name, false, "scaled")
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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 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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