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set_resources.go
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set_resources.go
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/*
Copyright 2016 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 set
import (
"fmt"
"github.com/golang/glog"
"github.com/spf13/cobra"
"k8s.io/api/core/v1"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/types"
utilerrors "k8s.io/apimachinery/pkg/util/errors"
"k8s.io/kubernetes/pkg/kubectl"
"k8s.io/kubernetes/pkg/kubectl/cmd/templates"
cmdutil "k8s.io/kubernetes/pkg/kubectl/cmd/util"
"k8s.io/kubernetes/pkg/kubectl/genericclioptions"
"k8s.io/kubernetes/pkg/kubectl/genericclioptions/printers"
"k8s.io/kubernetes/pkg/kubectl/genericclioptions/resource"
"k8s.io/kubernetes/pkg/kubectl/polymorphichelpers"
"k8s.io/kubernetes/pkg/kubectl/scheme"
"k8s.io/kubernetes/pkg/kubectl/util/i18n"
)
var (
resources_long = templates.LongDesc(`
Specify compute resource requirements (cpu, memory) for any resource that defines a pod template. If a pod is successfully scheduled, it is guaranteed the amount of resource requested, but may burst up to its specified limits.
for each compute resource, if a limit is specified and a request is omitted, the request will default to the limit.
Possible resources include (case insensitive): %s.`)
resources_example = templates.Examples(`
# Set a deployments nginx container cpu limits to "200m" and memory to "512Mi"
kubectl set resources deployment nginx -c=nginx --limits=cpu=200m,memory=512Mi
# Set the resource request and limits for all containers in nginx
kubectl set resources deployment nginx --limits=cpu=200m,memory=512Mi --requests=cpu=100m,memory=256Mi
# Remove the resource requests for resources on containers in nginx
kubectl set resources deployment nginx --limits=cpu=0,memory=0 --requests=cpu=0,memory=0
# Print the result (in yaml format) of updating nginx container limits from a local, without hitting the server
kubectl set resources -f path/to/file.yaml --limits=cpu=200m,memory=512Mi --local -o yaml`)
)
// ResourcesOptions is the start of the data required to perform the operation. As new fields are added, add them here instead of
// referencing the cmd.Flags
type SetResourcesOptions struct {
resource.FilenameOptions
PrintFlags *genericclioptions.PrintFlags
RecordFlags *genericclioptions.RecordFlags
Infos []*resource.Info
Selector string
ContainerSelector string
Output string
All bool
Local bool
DryRun bool
PrintObj printers.ResourcePrinterFunc
Recorder genericclioptions.Recorder
Limits string
Requests string
ResourceRequirements v1.ResourceRequirements
UpdatePodSpecForObject polymorphichelpers.UpdatePodSpecForObjectFunc
Resources []string
genericclioptions.IOStreams
}
// NewResourcesOptions returns a ResourcesOptions indicating all containers in the selected
// pod templates are selected by default.
func NewResourcesOptions(streams genericclioptions.IOStreams) *SetResourcesOptions {
return &SetResourcesOptions{
PrintFlags: genericclioptions.NewPrintFlags("resource requirements updated").WithTypeSetter(scheme.Scheme),
RecordFlags: genericclioptions.NewRecordFlags(),
Recorder: genericclioptions.NoopRecorder{},
ContainerSelector: "*",
IOStreams: streams,
}
}
func NewCmdResources(f cmdutil.Factory, streams genericclioptions.IOStreams) *cobra.Command {
o := NewResourcesOptions(streams)
cmd := &cobra.Command{
Use: "resources (-f FILENAME | TYPE NAME) ([--limits=LIMITS & --requests=REQUESTS]",
DisableFlagsInUseLine: true,
Short: i18n.T("Update resource requests/limits on objects with pod templates"),
Long: fmt.Sprintf(resources_long, cmdutil.SuggestApiResources("kubectl")),
Example: resources_example,
Run: func(cmd *cobra.Command, args []string) {
cmdutil.CheckErr(o.Complete(f, cmd, args))
cmdutil.CheckErr(o.Validate())
cmdutil.CheckErr(o.Run())
},
}
o.PrintFlags.AddFlags(cmd)
o.RecordFlags.AddFlags(cmd)
//usage := "Filename, directory, or URL to a file identifying the resource to get from the server"
//kubectl.AddJsonFilenameFlag(cmd, &options.Filenames, usage)
usage := "identifying the resource to get from a server."
cmdutil.AddFilenameOptionFlags(cmd, &o.FilenameOptions, usage)
cmd.Flags().BoolVar(&o.All, "all", o.All, "Select all resources, including uninitialized ones, in the namespace of the specified resource types")
cmd.Flags().StringVarP(&o.Selector, "selector", "l", o.Selector, "Selector (label query) to filter on, not including uninitialized ones,supports '=', '==', and '!='.(e.g. -l key1=value1,key2=value2)")
cmd.Flags().StringVarP(&o.ContainerSelector, "containers", "c", o.ContainerSelector, "The names of containers in the selected pod templates to change, all containers are selected by default - may use wildcards")
cmd.Flags().BoolVar(&o.Local, "local", o.Local, "If true, set resources will NOT contact api-server but run locally.")
cmdutil.AddDryRunFlag(cmd)
cmdutil.AddIncludeUninitializedFlag(cmd)
cmd.Flags().StringVar(&o.Limits, "limits", o.Limits, "The resource requirement requests for this container. For example, 'cpu=100m,memory=256Mi'. Note that server side components may assign requests depending on the server configuration, such as limit ranges.")
cmd.Flags().StringVar(&o.Requests, "requests", o.Requests, "The resource requirement requests for this container. For example, 'cpu=100m,memory=256Mi'. Note that server side components may assign requests depending on the server configuration, such as limit ranges.")
return cmd
}
func (o *SetResourcesOptions) Complete(f cmdutil.Factory, cmd *cobra.Command, args []string) error {
var err error
o.RecordFlags.Complete(cmd)
o.Recorder, err = o.RecordFlags.ToRecorder()
if err != nil {
return err
}
o.UpdatePodSpecForObject = polymorphichelpers.UpdatePodSpecForObjectFn
o.Output = cmdutil.GetFlagString(cmd, "output")
o.DryRun = cmdutil.GetDryRunFlag(cmd)
if o.DryRun {
o.PrintFlags.Complete("%s (dry run)")
}
printer, err := o.PrintFlags.ToPrinter()
if err != nil {
return err
}
o.PrintObj = printer.PrintObj
cmdNamespace, enforceNamespace, err := f.ToRawKubeConfigLoader().Namespace()
if err != nil {
return err
}
includeUninitialized := cmdutil.ShouldIncludeUninitialized(cmd, false)
builder := f.NewBuilder().
WithScheme(scheme.Scheme, scheme.Scheme.PrioritizedVersionsAllGroups()...).
LocalParam(o.Local).
ContinueOnError().
NamespaceParam(cmdNamespace).DefaultNamespace().
FilenameParam(enforceNamespace, &o.FilenameOptions).
IncludeUninitialized(includeUninitialized).
Flatten()
if !o.Local {
builder.LabelSelectorParam(o.Selector).
ResourceTypeOrNameArgs(o.All, args...).
Latest()
} else {
// if a --local flag was provided, and a resource was specified in the form
// <resource>/<name>, fail immediately as --local cannot query the api server
// for the specified resource.
// TODO: this should be in the builder - if someone specifies tuples, fail when
// local is true
if len(args) > 0 {
return resource.LocalResourceError
}
}
o.Infos, err = builder.Do().Infos()
if err != nil {
return err
}
return nil
}
func (o *SetResourcesOptions) Validate() error {
var err error
if o.All && len(o.Selector) > 0 {
return fmt.Errorf("cannot set --all and --selector at the same time")
}
if len(o.Limits) == 0 && len(o.Requests) == 0 {
return fmt.Errorf("you must specify an update to requests or limits (in the form of --requests/--limits)")
}
o.ResourceRequirements, err = kubectl.HandleResourceRequirementsV1(map[string]string{"limits": o.Limits, "requests": o.Requests})
if err != nil {
return err
}
return nil
}
func (o *SetResourcesOptions) Run() error {
allErrs := []error{}
patches := CalculatePatches(o.Infos, scheme.DefaultJSONEncoder(), func(obj runtime.Object) ([]byte, error) {
transformed := false
_, err := o.UpdatePodSpecForObject(obj, func(spec *v1.PodSpec) error {
containers, _ := selectContainers(spec.Containers, o.ContainerSelector)
if len(containers) != 0 {
for i := range containers {
if len(o.Limits) != 0 && len(containers[i].Resources.Limits) == 0 {
containers[i].Resources.Limits = make(v1.ResourceList)
}
for key, value := range o.ResourceRequirements.Limits {
containers[i].Resources.Limits[key] = value
}
if len(o.Requests) != 0 && len(containers[i].Resources.Requests) == 0 {
containers[i].Resources.Requests = make(v1.ResourceList)
}
for key, value := range o.ResourceRequirements.Requests {
containers[i].Resources.Requests[key] = value
}
transformed = true
}
} else {
allErrs = append(allErrs, fmt.Errorf("error: unable to find container named %s", o.ContainerSelector))
}
return nil
})
if err != nil {
return nil, err
}
if !transformed {
return nil, nil
}
// record this change (for rollout history)
if err := o.Recorder.Record(obj); err != nil {
glog.V(4).Infof("error recording current command: %v", err)
}
return runtime.Encode(scheme.DefaultJSONEncoder(), obj)
})
for _, patch := range patches {
info := patch.Info
if patch.Err != nil {
allErrs = append(allErrs, fmt.Errorf("error: %s/%s %v\n", info.Mapping.Resource, info.Name, patch.Err))
continue
}
//no changes
if string(patch.Patch) == "{}" || len(patch.Patch) == 0 {
allErrs = append(allErrs, fmt.Errorf("info: %s %q was not changed\n", info.Mapping.Resource, info.Name))
continue
}
if o.Local || o.DryRun {
if err := o.PrintObj(info.Object, o.Out); err != nil {
allErrs = append(allErrs, err)
}
continue
}
actual, err := resource.NewHelper(info.Client, info.Mapping).Patch(info.Namespace, info.Name, types.StrategicMergePatchType, patch.Patch)
if err != nil {
allErrs = append(allErrs, fmt.Errorf("failed to patch limit update to pod template %v\n", err))
continue
}
if err := o.PrintObj(actual, o.Out); err != nil {
allErrs = append(allErrs, err)
}
}
return utilerrors.NewAggregate(allErrs)
}