mirror of https://github.com/k3s-io/k3s
126 lines
4.0 KiB
Go
126 lines
4.0 KiB
Go
/*
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Copyright 2017 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 defaulttolerationseconds
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import (
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"context"
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"flag"
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"fmt"
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"io"
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v1 "k8s.io/api/core/v1"
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"k8s.io/apimachinery/pkg/api/errors"
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"k8s.io/apiserver/pkg/admission"
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api "k8s.io/kubernetes/pkg/apis/core"
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)
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// PluginName indicates name of admission plugin.
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const PluginName = "DefaultTolerationSeconds"
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var (
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defaultNotReadyTolerationSeconds = flag.Int64("default-not-ready-toleration-seconds", 300,
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"Indicates the tolerationSeconds of the toleration for notReady:NoExecute"+
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" that is added by default to every pod that does not already have such a toleration.")
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defaultUnreachableTolerationSeconds = flag.Int64("default-unreachable-toleration-seconds", 300,
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"Indicates the tolerationSeconds of the toleration for unreachable:NoExecute"+
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" that is added by default to every pod that does not already have such a toleration.")
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notReadyToleration = api.Toleration{
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Key: v1.TaintNodeNotReady,
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Operator: api.TolerationOpExists,
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Effect: api.TaintEffectNoExecute,
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TolerationSeconds: defaultNotReadyTolerationSeconds,
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}
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unreachableToleration = api.Toleration{
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Key: v1.TaintNodeUnreachable,
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Operator: api.TolerationOpExists,
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Effect: api.TaintEffectNoExecute,
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TolerationSeconds: defaultUnreachableTolerationSeconds,
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}
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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 NewDefaultTolerationSeconds(), nil
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})
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}
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// Plugin contains the client used by the admission controller
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// It will add default tolerations for every pod
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// that tolerate taints `notReady:NoExecute` and `unreachable:NoExecute`,
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// with tolerationSeconds of 300s.
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// If the pod already specifies a toleration for taint `notReady:NoExecute`
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// or `unreachable:NoExecute`, the plugin won't touch it.
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type Plugin struct {
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*admission.Handler
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}
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var _ admission.MutationInterface = &Plugin{}
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// NewDefaultTolerationSeconds creates a new instance of the DefaultTolerationSeconds admission controller
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func NewDefaultTolerationSeconds() *Plugin {
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return &Plugin{
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Handler: admission.NewHandler(admission.Create, admission.Update),
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}
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}
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// Admit makes an admission decision based on the request attributes
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func (p *Plugin) Admit(ctx context.Context, attributes admission.Attributes, o admission.ObjectInterfaces) (err error) {
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if attributes.GetResource().GroupResource() != api.Resource("pods") {
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return nil
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}
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if len(attributes.GetSubresource()) > 0 {
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// only run the checks below on pods proper and not subresources
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return nil
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}
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pod, ok := attributes.GetObject().(*api.Pod)
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if !ok {
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return errors.NewBadRequest(fmt.Sprintf("expected *api.Pod but got %T", attributes.GetObject()))
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}
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tolerations := pod.Spec.Tolerations
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toleratesNodeNotReady := false
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toleratesNodeUnreachable := false
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for _, toleration := range tolerations {
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if (toleration.Key == v1.TaintNodeNotReady || len(toleration.Key) == 0) &&
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(toleration.Effect == api.TaintEffectNoExecute || len(toleration.Effect) == 0) {
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toleratesNodeNotReady = true
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}
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if (toleration.Key == v1.TaintNodeUnreachable || len(toleration.Key) == 0) &&
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(toleration.Effect == api.TaintEffectNoExecute || len(toleration.Effect) == 0) {
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toleratesNodeUnreachable = true
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}
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}
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if !toleratesNodeNotReady {
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pod.Spec.Tolerations = append(pod.Spec.Tolerations, notReadyToleration)
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}
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if !toleratesNodeUnreachable {
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pod.Spec.Tolerations = append(pod.Spec.Tolerations, unreachableToleration)
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}
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return nil
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}
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