5e36f63f8b
quantities 'CPU' and 'Memory' will be preserved until support for v1beta1 and v1beta2 APIs are dropped. Improved resource validation in the process.
72 lines
2.3 KiB
Go
72 lines
2.3 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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pod.Spec.Containers[index].Resources.Limits = api.ResourceList{}
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if pod.Spec.Containers[index].Resources.Limits.Memory().Value() == 0 {
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pod.Spec.Containers[index].Resources.Limits[api.ResourceMemory] = resource.MustParse(defaultMemory)
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}
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if pod.Spec.Containers[index].Resources.Limits.Cpu().Value() == 0 {
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pod.Spec.Containers[index].Resources.Limits[api.ResourceCPU] = 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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