mirror of https://github.com/k3s-io/k3s
614 lines
23 KiB
Go
614 lines
23 KiB
Go
/*
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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 limitranger
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import (
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"fmt"
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"io"
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"sort"
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"strings"
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"time"
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"github.com/hashicorp/golang-lru"
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corev1 "k8s.io/api/core/v1"
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"k8s.io/apimachinery/pkg/api/meta"
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"k8s.io/apimachinery/pkg/api/resource"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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"k8s.io/apimachinery/pkg/labels"
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"k8s.io/apimachinery/pkg/runtime"
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utilerrors "k8s.io/apimachinery/pkg/util/errors"
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"k8s.io/apiserver/pkg/admission"
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genericadmissioninitailizer "k8s.io/apiserver/pkg/admission/initializer"
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"k8s.io/client-go/informers"
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"k8s.io/client-go/kubernetes"
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corev1listers "k8s.io/client-go/listers/core/v1"
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api "k8s.io/kubernetes/pkg/apis/core"
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)
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const (
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limitRangerAnnotation = "kubernetes.io/limit-ranger"
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// PluginName indicates name of admission plugin.
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PluginName = "LimitRanger"
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)
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// Register registers a plugin
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func Register(plugins *admission.Plugins) {
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plugins.Register(PluginName, func(config io.Reader) (admission.Interface, error) {
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return NewLimitRanger(&DefaultLimitRangerActions{})
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})
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}
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// LimitRanger enforces usage limits on a per resource basis in the namespace
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type LimitRanger struct {
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*admission.Handler
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client kubernetes.Interface
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actions LimitRangerActions
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lister corev1listers.LimitRangeLister
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// liveLookups holds the last few live lookups we've done to help ammortize cost on repeated lookup failures.
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// This let's us handle the case of latent caches, by looking up actual results for a namespace on cache miss/no results.
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// We track the lookup result here so that for repeated requests, we don't look it up very often.
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liveLookupCache *lru.Cache
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liveTTL time.Duration
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}
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var _ admission.MutationInterface = &LimitRanger{}
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var _ admission.ValidationInterface = &LimitRanger{}
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var _ genericadmissioninitailizer.WantsExternalKubeInformerFactory = &LimitRanger{}
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var _ genericadmissioninitailizer.WantsExternalKubeClientSet = &LimitRanger{}
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type liveLookupEntry struct {
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expiry time.Time
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items []*corev1.LimitRange
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}
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// SetExternalKubeInformerFactory registers an informer factory into the LimitRanger
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func (l *LimitRanger) SetExternalKubeInformerFactory(f informers.SharedInformerFactory) {
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limitRangeInformer := f.Core().V1().LimitRanges()
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l.SetReadyFunc(limitRangeInformer.Informer().HasSynced)
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l.lister = limitRangeInformer.Lister()
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}
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// SetExternalKubeClientSet registers the client into LimitRanger
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func (l *LimitRanger) SetExternalKubeClientSet(client kubernetes.Interface) {
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l.client = client
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}
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// ValidateInitialization verifies the LimitRanger object has been properly initialized
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func (l *LimitRanger) ValidateInitialization() error {
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if l.lister == nil {
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return fmt.Errorf("missing limitRange lister")
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}
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if l.client == nil {
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return fmt.Errorf("missing client")
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}
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return nil
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}
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// Admit admits resources into cluster that do not violate any defined LimitRange in the namespace
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func (l *LimitRanger) Admit(a admission.Attributes, o admission.ObjectInterfaces) (err error) {
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return l.runLimitFunc(a, l.actions.MutateLimit)
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}
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// Validate admits resources into cluster that do not violate any defined LimitRange in the namespace
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func (l *LimitRanger) Validate(a admission.Attributes, o admission.ObjectInterfaces) (err error) {
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return l.runLimitFunc(a, l.actions.ValidateLimit)
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}
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func (l *LimitRanger) runLimitFunc(a admission.Attributes, limitFn func(limitRange *corev1.LimitRange, kind string, obj runtime.Object) error) (err error) {
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if !l.actions.SupportsAttributes(a) {
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return nil
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}
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// ignore all objects marked for deletion
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oldObj := a.GetOldObject()
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if oldObj != nil {
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oldAccessor, err := meta.Accessor(oldObj)
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if err != nil {
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return admission.NewForbidden(a, err)
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}
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if oldAccessor.GetDeletionTimestamp() != nil {
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return nil
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}
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}
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items, err := l.GetLimitRanges(a)
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if err != nil {
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return err
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}
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// ensure it meets each prescribed min/max
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for i := range items {
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limitRange := items[i]
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if !l.actions.SupportsLimit(limitRange) {
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continue
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}
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err = limitFn(limitRange, a.GetResource().Resource, a.GetObject())
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if err != nil {
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return admission.NewForbidden(a, err)
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}
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}
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return nil
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}
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// GetLimitRanges returns a LimitRange object with the items held in
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// the indexer if available, or do alive lookup of the value.
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func (l *LimitRanger) GetLimitRanges(a admission.Attributes) ([]*corev1.LimitRange, error) {
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items, err := l.lister.LimitRanges(a.GetNamespace()).List(labels.Everything())
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if err != nil {
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return nil, admission.NewForbidden(a, fmt.Errorf("unable to %s %v at this time because there was an error enforcing limit ranges", a.GetOperation(), a.GetResource()))
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}
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// if there are no items held in our indexer, check our live-lookup LRU, if that misses, do the live lookup to prime it.
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if len(items) == 0 {
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lruItemObj, ok := l.liveLookupCache.Get(a.GetNamespace())
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if !ok || lruItemObj.(liveLookupEntry).expiry.Before(time.Now()) {
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// TODO: If there are multiple operations at the same time and cache has just expired,
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// this may cause multiple List operations being issued at the same time.
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// If there is already in-flight List() for a given namespace, we should wait until
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// it is finished and cache is updated instead of doing the same, also to avoid
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// throttling - see #22422 for details.
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liveList, err := l.client.CoreV1().LimitRanges(a.GetNamespace()).List(metav1.ListOptions{})
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if err != nil {
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return nil, admission.NewForbidden(a, err)
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}
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newEntry := liveLookupEntry{expiry: time.Now().Add(l.liveTTL)}
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for i := range liveList.Items {
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newEntry.items = append(newEntry.items, &liveList.Items[i])
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}
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l.liveLookupCache.Add(a.GetNamespace(), newEntry)
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lruItemObj = newEntry
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}
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lruEntry := lruItemObj.(liveLookupEntry)
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for i := range lruEntry.items {
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items = append(items, lruEntry.items[i])
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}
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}
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return items, nil
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}
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// NewLimitRanger returns an object that enforces limits based on the supplied limit function
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func NewLimitRanger(actions LimitRangerActions) (*LimitRanger, error) {
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liveLookupCache, err := lru.New(10000)
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if err != nil {
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return nil, err
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}
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if actions == nil {
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actions = &DefaultLimitRangerActions{}
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}
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return &LimitRanger{
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Handler: admission.NewHandler(admission.Create, admission.Update),
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actions: actions,
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liveLookupCache: liveLookupCache,
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liveTTL: time.Duration(30 * time.Second),
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}, nil
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}
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// defaultContainerResourceRequirements returns the default requirements for a container
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// the requirement.Limits are taken from the LimitRange defaults (if specified)
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// the requirement.Requests are taken from the LimitRange default request (if specified)
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func defaultContainerResourceRequirements(limitRange *corev1.LimitRange) api.ResourceRequirements {
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requirements := api.ResourceRequirements{}
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requirements.Requests = api.ResourceList{}
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requirements.Limits = api.ResourceList{}
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for i := range limitRange.Spec.Limits {
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limit := limitRange.Spec.Limits[i]
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if limit.Type == corev1.LimitTypeContainer {
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for k, v := range limit.DefaultRequest {
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value := v.Copy()
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requirements.Requests[api.ResourceName(k)] = *value
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}
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for k, v := range limit.Default {
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value := v.Copy()
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requirements.Limits[api.ResourceName(k)] = *value
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}
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}
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}
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return requirements
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}
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// mergeContainerResources handles defaulting all of the resources on a container.
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func mergeContainerResources(container *api.Container, defaultRequirements *api.ResourceRequirements, annotationPrefix string, annotations []string) []string {
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setRequests := []string{}
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setLimits := []string{}
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if container.Resources.Limits == nil {
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container.Resources.Limits = api.ResourceList{}
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}
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if container.Resources.Requests == nil {
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container.Resources.Requests = api.ResourceList{}
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}
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for k, v := range defaultRequirements.Limits {
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_, found := container.Resources.Limits[k]
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if !found {
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container.Resources.Limits[k] = *v.Copy()
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setLimits = append(setLimits, string(k))
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}
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}
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for k, v := range defaultRequirements.Requests {
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_, found := container.Resources.Requests[k]
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if !found {
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container.Resources.Requests[k] = *v.Copy()
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setRequests = append(setRequests, string(k))
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}
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}
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if len(setRequests) > 0 {
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sort.Strings(setRequests)
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a := strings.Join(setRequests, ", ") + fmt.Sprintf(" request for %s %s", annotationPrefix, container.Name)
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annotations = append(annotations, a)
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}
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if len(setLimits) > 0 {
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sort.Strings(setLimits)
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a := strings.Join(setLimits, ", ") + fmt.Sprintf(" limit for %s %s", annotationPrefix, container.Name)
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annotations = append(annotations, a)
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}
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return annotations
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}
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// mergePodResourceRequirements merges enumerated requirements with default requirements
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// it annotates the pod with information about what requirements were modified
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func mergePodResourceRequirements(pod *api.Pod, defaultRequirements *api.ResourceRequirements) {
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annotations := []string{}
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for i := range pod.Spec.Containers {
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annotations = mergeContainerResources(&pod.Spec.Containers[i], defaultRequirements, "container", annotations)
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}
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for i := range pod.Spec.InitContainers {
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annotations = mergeContainerResources(&pod.Spec.InitContainers[i], defaultRequirements, "init container", annotations)
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}
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if len(annotations) > 0 {
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if pod.ObjectMeta.Annotations == nil {
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pod.ObjectMeta.Annotations = make(map[string]string)
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}
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val := "LimitRanger plugin set: " + strings.Join(annotations, "; ")
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pod.ObjectMeta.Annotations[limitRangerAnnotation] = val
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}
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}
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// requestLimitEnforcedValues returns the specified values at a common precision to support comparability
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func requestLimitEnforcedValues(requestQuantity, limitQuantity, enforcedQuantity resource.Quantity) (request, limit, enforced int64) {
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request = requestQuantity.Value()
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limit = limitQuantity.Value()
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enforced = enforcedQuantity.Value()
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// do a more precise comparison if possible (if the value won't overflow)
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if request <= resource.MaxMilliValue && limit <= resource.MaxMilliValue && enforced <= resource.MaxMilliValue {
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request = requestQuantity.MilliValue()
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limit = limitQuantity.MilliValue()
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enforced = enforcedQuantity.MilliValue()
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}
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return
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}
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// minConstraint enforces the min constraint over the specified resource
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func minConstraint(limitType string, resourceName string, enforced resource.Quantity, request api.ResourceList, limit api.ResourceList) error {
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req, reqExists := request[api.ResourceName(resourceName)]
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lim, limExists := limit[api.ResourceName(resourceName)]
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observedReqValue, observedLimValue, enforcedValue := requestLimitEnforcedValues(req, lim, enforced)
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if !reqExists {
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return fmt.Errorf("minimum %s usage per %s is %s. No request is specified", resourceName, limitType, enforced.String())
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}
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if observedReqValue < enforcedValue {
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return fmt.Errorf("minimum %s usage per %s is %s, but request is %s", resourceName, limitType, enforced.String(), req.String())
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}
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if limExists && (observedLimValue < enforcedValue) {
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return fmt.Errorf("minimum %s usage per %s is %s, but limit is %s", resourceName, limitType, enforced.String(), lim.String())
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}
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return nil
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}
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// maxRequestConstraint enforces the max constraint over the specified resource
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// use when specify LimitType resource doesn't recognize limit values
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func maxRequestConstraint(limitType string, resourceName string, enforced resource.Quantity, request api.ResourceList) error {
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req, reqExists := request[api.ResourceName(resourceName)]
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observedReqValue, _, enforcedValue := requestLimitEnforcedValues(req, resource.Quantity{}, enforced)
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if !reqExists {
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return fmt.Errorf("maximum %s usage per %s is %s. No request is specified", resourceName, limitType, enforced.String())
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}
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if observedReqValue > enforcedValue {
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return fmt.Errorf("maximum %s usage per %s is %s, but request is %s", resourceName, limitType, enforced.String(), req.String())
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}
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return nil
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}
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// maxConstraint enforces the max constraint over the specified resource
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func maxConstraint(limitType string, resourceName string, enforced resource.Quantity, request api.ResourceList, limit api.ResourceList) error {
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req, reqExists := request[api.ResourceName(resourceName)]
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lim, limExists := limit[api.ResourceName(resourceName)]
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observedReqValue, observedLimValue, enforcedValue := requestLimitEnforcedValues(req, lim, enforced)
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if !limExists {
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return fmt.Errorf("maximum %s usage per %s is %s. No limit is specified", resourceName, limitType, enforced.String())
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}
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if observedLimValue > enforcedValue {
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return fmt.Errorf("maximum %s usage per %s is %s, but limit is %s", resourceName, limitType, enforced.String(), lim.String())
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}
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if reqExists && (observedReqValue > enforcedValue) {
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return fmt.Errorf("maximum %s usage per %s is %s, but request is %s", resourceName, limitType, enforced.String(), req.String())
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}
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return nil
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}
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// limitRequestRatioConstraint enforces the limit to request ratio over the specified resource
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func limitRequestRatioConstraint(limitType string, resourceName string, enforced resource.Quantity, request api.ResourceList, limit api.ResourceList) error {
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req, reqExists := request[api.ResourceName(resourceName)]
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lim, limExists := limit[api.ResourceName(resourceName)]
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observedReqValue, observedLimValue, _ := requestLimitEnforcedValues(req, lim, enforced)
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if !reqExists || (observedReqValue == int64(0)) {
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return fmt.Errorf("%s max limit to request ratio per %s is %s, but no request is specified or request is 0", resourceName, limitType, enforced.String())
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}
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if !limExists || (observedLimValue == int64(0)) {
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return fmt.Errorf("%s max limit to request ratio per %s is %s, but no limit is specified or limit is 0", resourceName, limitType, enforced.String())
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}
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observedRatio := float64(observedLimValue) / float64(observedReqValue)
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displayObservedRatio := observedRatio
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maxLimitRequestRatio := float64(enforced.Value())
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if enforced.Value() <= resource.MaxMilliValue {
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observedRatio = observedRatio * 1000
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maxLimitRequestRatio = float64(enforced.MilliValue())
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}
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if observedRatio > maxLimitRequestRatio {
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return fmt.Errorf("%s max limit to request ratio per %s is %s, but provided ratio is %f", resourceName, limitType, enforced.String(), displayObservedRatio)
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}
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return nil
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}
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// sum takes the total of each named resource across all inputs
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// if a key is not in each input, then the output resource list will omit the key
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func sum(inputs []api.ResourceList) api.ResourceList {
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result := api.ResourceList{}
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keys := []api.ResourceName{}
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for i := range inputs {
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for k := range inputs[i] {
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keys = append(keys, k)
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}
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}
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for _, key := range keys {
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total, isSet := int64(0), true
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for i := range inputs {
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input := inputs[i]
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v, exists := input[key]
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if exists {
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if key == api.ResourceCPU {
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total = total + v.MilliValue()
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} else {
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total = total + v.Value()
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}
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} else {
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isSet = false
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}
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}
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if isSet {
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if key == api.ResourceCPU {
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result[key] = *(resource.NewMilliQuantity(total, resource.DecimalSI))
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} else {
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result[key] = *(resource.NewQuantity(total, resource.DecimalSI))
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}
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}
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}
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return result
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}
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// DefaultLimitRangerActions is the default implementation of LimitRangerActions.
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type DefaultLimitRangerActions struct{}
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// ensure DefaultLimitRangerActions implements the LimitRangerActions interface.
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var _ LimitRangerActions = &DefaultLimitRangerActions{}
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// MutateLimit enforces resource requirements of incoming resources
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// against enumerated constraints on the LimitRange. It may modify
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// the incoming object to apply default resource requirements if not
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// specified, and enumerated on the LimitRange
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func (d *DefaultLimitRangerActions) MutateLimit(limitRange *corev1.LimitRange, resourceName string, obj runtime.Object) error {
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switch resourceName {
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case "pods":
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return PodMutateLimitFunc(limitRange, obj.(*api.Pod))
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}
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return nil
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}
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// ValidateLimit verifies the resource requirements of incoming
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// resources against enumerated constraints on the LimitRange are
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// valid
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func (d *DefaultLimitRangerActions) ValidateLimit(limitRange *corev1.LimitRange, resourceName string, obj runtime.Object) error {
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switch resourceName {
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case "pods":
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return PodValidateLimitFunc(limitRange, obj.(*api.Pod))
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case "persistentvolumeclaims":
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return PersistentVolumeClaimValidateLimitFunc(limitRange, obj.(*api.PersistentVolumeClaim))
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}
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return nil
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}
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// SupportsAttributes ignores all calls that do not deal with pod resources or storage requests (PVCs).
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// Also ignores any call that has a subresource defined.
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func (d *DefaultLimitRangerActions) SupportsAttributes(a admission.Attributes) bool {
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if a.GetSubresource() != "" {
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return false
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}
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// Since containers and initContainers cannot currently be added, removed, or updated, it is unnecessary
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// to mutate and validate limitrange on pod updates. Trying to mutate containers or initContainers on a pod
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// update request will always fail pod validation because those fields are immutable once the object is created.
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if a.GetKind().GroupKind() == api.Kind("Pod") && a.GetOperation() == admission.Update {
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return false
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}
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return a.GetKind().GroupKind() == api.Kind("Pod") || a.GetKind().GroupKind() == api.Kind("PersistentVolumeClaim")
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}
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// SupportsLimit always returns true.
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func (d *DefaultLimitRangerActions) SupportsLimit(limitRange *corev1.LimitRange) bool {
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return true
|
|
}
|
|
|
|
// PersistentVolumeClaimValidateLimitFunc enforces storage limits for PVCs.
|
|
// Users request storage via pvc.Spec.Resources.Requests. Min/Max is enforced by an admin with LimitRange.
|
|
// Claims will not be modified with default values because storage is a required part of pvc.Spec.
|
|
// All storage enforced values *only* apply to pvc.Spec.Resources.Requests.
|
|
func PersistentVolumeClaimValidateLimitFunc(limitRange *corev1.LimitRange, pvc *api.PersistentVolumeClaim) error {
|
|
var errs []error
|
|
for i := range limitRange.Spec.Limits {
|
|
limit := limitRange.Spec.Limits[i]
|
|
limitType := limit.Type
|
|
if limitType == corev1.LimitTypePersistentVolumeClaim {
|
|
for k, v := range limit.Min {
|
|
// normal usage of minConstraint. pvc.Spec.Resources.Limits is not recognized as user input
|
|
if err := minConstraint(string(limitType), string(k), v, pvc.Spec.Resources.Requests, api.ResourceList{}); err != nil {
|
|
errs = append(errs, err)
|
|
}
|
|
}
|
|
for k, v := range limit.Max {
|
|
// We want to enforce the max of the LimitRange against what
|
|
// the user requested.
|
|
if err := maxRequestConstraint(string(limitType), string(k), v, pvc.Spec.Resources.Requests); err != nil {
|
|
errs = append(errs, err)
|
|
}
|
|
}
|
|
}
|
|
}
|
|
return utilerrors.NewAggregate(errs)
|
|
}
|
|
|
|
// PodMutateLimitFunc sets resource requirements enumerated by the pod against
|
|
// the specified LimitRange. The pod may be modified to apply default resource
|
|
// requirements if not specified, and enumerated on the LimitRange
|
|
func PodMutateLimitFunc(limitRange *corev1.LimitRange, pod *api.Pod) error {
|
|
defaultResources := defaultContainerResourceRequirements(limitRange)
|
|
mergePodResourceRequirements(pod, &defaultResources)
|
|
return nil
|
|
}
|
|
|
|
// PodValidateLimitFunc enforces resource requirements enumerated by the pod against
|
|
// the specified LimitRange.
|
|
func PodValidateLimitFunc(limitRange *corev1.LimitRange, pod *api.Pod) error {
|
|
var errs []error
|
|
|
|
for i := range limitRange.Spec.Limits {
|
|
limit := limitRange.Spec.Limits[i]
|
|
limitType := limit.Type
|
|
// enforce container limits
|
|
if limitType == corev1.LimitTypeContainer {
|
|
for j := range pod.Spec.Containers {
|
|
container := &pod.Spec.Containers[j]
|
|
for k, v := range limit.Min {
|
|
if err := minConstraint(string(limitType), string(k), v, container.Resources.Requests, container.Resources.Limits); err != nil {
|
|
errs = append(errs, err)
|
|
}
|
|
}
|
|
for k, v := range limit.Max {
|
|
if err := maxConstraint(string(limitType), string(k), v, container.Resources.Requests, container.Resources.Limits); err != nil {
|
|
errs = append(errs, err)
|
|
}
|
|
}
|
|
for k, v := range limit.MaxLimitRequestRatio {
|
|
if err := limitRequestRatioConstraint(string(limitType), string(k), v, container.Resources.Requests, container.Resources.Limits); err != nil {
|
|
errs = append(errs, err)
|
|
}
|
|
}
|
|
}
|
|
for j := range pod.Spec.InitContainers {
|
|
container := &pod.Spec.InitContainers[j]
|
|
for k, v := range limit.Min {
|
|
if err := minConstraint(string(limitType), string(k), v, container.Resources.Requests, container.Resources.Limits); err != nil {
|
|
errs = append(errs, err)
|
|
}
|
|
}
|
|
for k, v := range limit.Max {
|
|
if err := maxConstraint(string(limitType), string(k), v, container.Resources.Requests, container.Resources.Limits); err != nil {
|
|
errs = append(errs, err)
|
|
}
|
|
}
|
|
for k, v := range limit.MaxLimitRequestRatio {
|
|
if err := limitRequestRatioConstraint(string(limitType), string(k), v, container.Resources.Requests, container.Resources.Limits); err != nil {
|
|
errs = append(errs, err)
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// enforce pod limits on init containers
|
|
if limitType == corev1.LimitTypePod {
|
|
containerRequests, containerLimits := []api.ResourceList{}, []api.ResourceList{}
|
|
for j := range pod.Spec.Containers {
|
|
container := &pod.Spec.Containers[j]
|
|
containerRequests = append(containerRequests, container.Resources.Requests)
|
|
containerLimits = append(containerLimits, container.Resources.Limits)
|
|
}
|
|
podRequests := sum(containerRequests)
|
|
podLimits := sum(containerLimits)
|
|
for j := range pod.Spec.InitContainers {
|
|
container := &pod.Spec.InitContainers[j]
|
|
// take max(sum_containers, any_init_container)
|
|
for k, v := range container.Resources.Requests {
|
|
if v2, ok := podRequests[k]; ok {
|
|
if v.Cmp(v2) > 0 {
|
|
podRequests[k] = v
|
|
}
|
|
} else {
|
|
podRequests[k] = v
|
|
}
|
|
}
|
|
for k, v := range container.Resources.Limits {
|
|
if v2, ok := podLimits[k]; ok {
|
|
if v.Cmp(v2) > 0 {
|
|
podLimits[k] = v
|
|
}
|
|
} else {
|
|
podLimits[k] = v
|
|
}
|
|
}
|
|
}
|
|
for k, v := range limit.Min {
|
|
if err := minConstraint(string(limitType), string(k), v, podRequests, podLimits); err != nil {
|
|
errs = append(errs, err)
|
|
}
|
|
}
|
|
for k, v := range limit.Max {
|
|
if err := maxConstraint(string(limitType), string(k), v, podRequests, podLimits); err != nil {
|
|
errs = append(errs, err)
|
|
}
|
|
}
|
|
for k, v := range limit.MaxLimitRequestRatio {
|
|
if err := limitRequestRatioConstraint(string(limitType), string(k), v, podRequests, podLimits); err != nil {
|
|
errs = append(errs, err)
|
|
}
|
|
}
|
|
}
|
|
}
|
|
return utilerrors.NewAggregate(errs)
|
|
}
|