mirror of https://github.com/k3s-io/k3s
268 lines
8.4 KiB
Go
268 lines
8.4 KiB
Go
/*
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Copyright 2016 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 create
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import (
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"context"
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"fmt"
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"regexp"
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"github.com/spf13/cobra"
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policyv1 "k8s.io/api/policy/v1"
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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/apimachinery/pkg/util/intstr"
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"k8s.io/cli-runtime/pkg/genericclioptions"
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resourcecli "k8s.io/cli-runtime/pkg/resource"
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policyv1client "k8s.io/client-go/kubernetes/typed/policy/v1"
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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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pdbLong = templates.LongDesc(i18n.T(`
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Create a pod disruption budget with the specified name, selector, and desired minimum available pods.`))
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pdbExample = templates.Examples(i18n.T(`
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# Create a pod disruption budget named my-pdb that will select all pods with the app=rails label
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# and require at least one of them being available at any point in time
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kubectl create poddisruptionbudget my-pdb --selector=app=rails --min-available=1
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# Create a pod disruption budget named my-pdb that will select all pods with the app=nginx label
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# and require at least half of the pods selected to be available at any point in time
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kubectl create pdb my-pdb --selector=app=nginx --min-available=50%`))
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)
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// PodDisruptionBudgetOpts holds the command-line options for poddisruptionbudget sub command
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type PodDisruptionBudgetOpts struct {
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// PrintFlags holds options necessary for obtaining a printer
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PrintFlags *genericclioptions.PrintFlags
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PrintObj func(obj runtime.Object) error
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// Name of resource being created
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Name string
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MinAvailable string
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MaxUnavailable string
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// A label selector to use for this budget
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Selector string
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CreateAnnotation bool
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FieldManager string
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Namespace string
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EnforceNamespace bool
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Client *policyv1client.PolicyV1Client
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DryRunStrategy cmdutil.DryRunStrategy
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DryRunVerifier *resourcecli.DryRunVerifier
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genericclioptions.IOStreams
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}
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// NewPodDisruptionBudgetOpts creates a new *PodDisruptionBudgetOpts with sane defaults
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func NewPodDisruptionBudgetOpts(ioStreams genericclioptions.IOStreams) *PodDisruptionBudgetOpts {
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return &PodDisruptionBudgetOpts{
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PrintFlags: genericclioptions.NewPrintFlags("created").WithTypeSetter(scheme.Scheme),
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IOStreams: ioStreams,
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}
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}
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// NewCmdCreatePodDisruptionBudget is a macro command to create a new pod disruption budget.
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func NewCmdCreatePodDisruptionBudget(f cmdutil.Factory, ioStreams genericclioptions.IOStreams) *cobra.Command {
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o := NewPodDisruptionBudgetOpts(ioStreams)
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cmd := &cobra.Command{
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Use: "poddisruptionbudget NAME --selector=SELECTOR --min-available=N [--dry-run=server|client|none]",
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DisableFlagsInUseLine: true,
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Aliases: []string{"pdb"},
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Short: i18n.T("Create a pod disruption budget with the specified name"),
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Long: pdbLong,
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Example: pdbExample,
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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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o.PrintFlags.AddFlags(cmd)
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cmdutil.AddApplyAnnotationFlags(cmd)
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cmdutil.AddValidateFlags(cmd)
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cmdutil.AddDryRunFlag(cmd)
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cmd.Flags().StringVar(&o.MinAvailable, "min-available", o.MinAvailable, i18n.T("The minimum number or percentage of available pods this budget requires."))
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cmd.Flags().StringVar(&o.MaxUnavailable, "max-unavailable", o.MaxUnavailable, i18n.T("The maximum number or percentage of unavailable pods this budget requires."))
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cmd.Flags().StringVar(&o.Selector, "selector", o.Selector, i18n.T("A label selector to use for this budget. Only equality-based selector requirements are supported."))
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cmdutil.AddFieldManagerFlagVar(cmd, &o.FieldManager, "kubectl-create")
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return cmd
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}
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// Complete completes all the required options
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func (o *PodDisruptionBudgetOpts) Complete(f cmdutil.Factory, cmd *cobra.Command, args []string) error {
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var err error
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o.Name, err = NameFromCommandArgs(cmd, args)
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if err != nil {
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return err
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}
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restConfig, err := f.ToRESTConfig()
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if err != nil {
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return err
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}
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o.Client, err = policyv1client.NewForConfig(restConfig)
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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.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 = resourcecli.NewDryRunVerifier(dynamicClient, discoveryClient)
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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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cmdutil.PrintFlagsWithDryRunStrategy(o.PrintFlags, o.DryRunStrategy)
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printer, err := o.PrintFlags.ToPrinter()
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if err != nil {
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return err
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}
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o.PrintObj = func(obj runtime.Object) error {
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return printer.PrintObj(obj, o.Out)
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}
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return nil
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}
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// Validate checks to the PodDisruptionBudgetOpts to see if there is sufficient information run the command
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func (o *PodDisruptionBudgetOpts) Validate() error {
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if len(o.Name) == 0 {
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return fmt.Errorf("name must be specified")
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}
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if len(o.Selector) == 0 {
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return fmt.Errorf("a selector must be specified")
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}
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if len(o.MaxUnavailable) == 0 && len(o.MinAvailable) == 0 {
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return fmt.Errorf("one of min-available or max-unavailable must be specified")
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}
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if len(o.MaxUnavailable) > 0 && len(o.MinAvailable) > 0 {
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return fmt.Errorf("min-available and max-unavailable cannot be both specified")
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}
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// The following regex matches the following values:
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// 10, 20, 30%, 50% (number and percentage)
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// but not 10Gb, 20Mb
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re := regexp.MustCompile(`^[0-9]+%?$`)
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switch {
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case len(o.MinAvailable) > 0 && !re.MatchString(o.MinAvailable):
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return fmt.Errorf("invalid format specified for min-available")
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case len(o.MaxUnavailable) > 0 && !re.MatchString(o.MaxUnavailable):
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return fmt.Errorf("invalid format specified for max-unavailable")
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}
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return nil
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}
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// Run calls the CreateSubcommandOptions.Run in PodDisruptionBudgetOpts instance
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func (o *PodDisruptionBudgetOpts) Run() error {
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podDisruptionBudget, err := o.createPodDisruptionBudgets()
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if err != nil {
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return err
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}
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if err := util.CreateOrUpdateAnnotation(o.CreateAnnotation, podDisruptionBudget, scheme.DefaultJSONEncoder()); err != nil {
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return err
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}
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if o.DryRunStrategy != cmdutil.DryRunClient {
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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(podDisruptionBudget.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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podDisruptionBudget, err = o.Client.PodDisruptionBudgets(o.Namespace).Create(context.TODO(), podDisruptionBudget, createOptions)
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if err != nil {
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return fmt.Errorf("failed to create poddisruptionbudgets: %v", err)
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}
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}
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return o.PrintObj(podDisruptionBudget)
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}
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func (o *PodDisruptionBudgetOpts) createPodDisruptionBudgets() (*policyv1.PodDisruptionBudget, error) {
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namespace := ""
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if o.EnforceNamespace {
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namespace = o.Namespace
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}
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podDisruptionBudget := &policyv1.PodDisruptionBudget{
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TypeMeta: metav1.TypeMeta{
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APIVersion: policyv1.SchemeGroupVersion.String(),
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Kind: "PodDisruptionBudget",
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},
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ObjectMeta: metav1.ObjectMeta{
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Name: o.Name,
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Namespace: namespace,
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},
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}
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selector, err := metav1.ParseToLabelSelector(o.Selector)
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if err != nil {
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return nil, err
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}
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podDisruptionBudget.Spec.Selector = selector
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switch {
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case len(o.MinAvailable) > 0:
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minAvailable := intstr.Parse(o.MinAvailable)
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podDisruptionBudget.Spec.MinAvailable = &minAvailable
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case len(o.MaxUnavailable) > 0:
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maxUnavailable := intstr.Parse(o.MaxUnavailable)
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podDisruptionBudget.Spec.MaxUnavailable = &maxUnavailable
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}
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return podDisruptionBudget, nil
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}
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