71 lines
2.1 KiB
Go
71 lines
2.1 KiB
Go
/*
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Copyright 2014 Google Inc. All rights reserved.
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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 resourcedefaults
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import (
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"io"
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"github.com/GoogleCloudPlatform/kubernetes/pkg/admission"
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"github.com/GoogleCloudPlatform/kubernetes/pkg/api"
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"github.com/GoogleCloudPlatform/kubernetes/pkg/api/resource"
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"github.com/GoogleCloudPlatform/kubernetes/pkg/client"
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)
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func init() {
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admission.RegisterPlugin("ResourceDefaults", func(client client.Interface, config io.Reader) (admission.Interface, error) {
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return NewResourceDefaults(), nil
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})
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}
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const (
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defaultMemory string = "512Mi"
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defaultCPU string = "1"
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)
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// resourceDefaults is an implementation of admission.Interface which applies default resource limits (cpu/memory)
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// It is useful for clusters that do not want to support unlimited usage constraints, but instead supply sensible defaults
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type resourceDefaults struct{}
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func (resourceDefaults) Admit(a admission.Attributes) (err error) {
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// ignore deletes, only process create and update
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if a.GetOperation() == "DELETE" {
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return nil
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}
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// we only care about pods
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if a.GetKind() != "pods" {
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return nil
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}
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// get the pod, so we can validate each of the containers within have default mem / cpu constraints
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obj := a.GetObject()
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pod := obj.(*api.Pod)
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for index := range pod.Spec.Containers {
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if pod.Spec.Containers[index].Memory.Value() == 0 {
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pod.Spec.Containers[index].Memory = resource.MustParse(defaultMemory)
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}
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if pod.Spec.Containers[index].CPU.Value() == 0 {
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pod.Spec.Containers[index].CPU = resource.MustParse(defaultCPU)
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}
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}
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return nil
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}
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func NewResourceDefaults() admission.Interface {
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return new(resourceDefaults)
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}
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