127 lines
4.7 KiB
Go
127 lines
4.7 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 rest
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import (
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"fmt"
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"time"
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"github.com/golang/glog"
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apierrors "k8s.io/apimachinery/pkg/api/errors"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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utilruntime "k8s.io/apimachinery/pkg/util/runtime"
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"k8s.io/apimachinery/pkg/util/wait"
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"k8s.io/apiserver/pkg/registry/generic"
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"k8s.io/apiserver/pkg/registry/rest"
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genericapiserver "k8s.io/apiserver/pkg/server"
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serverstorage "k8s.io/apiserver/pkg/server/storage"
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"k8s.io/kubernetes/pkg/api/legacyscheme"
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"k8s.io/kubernetes/pkg/apis/scheduling"
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schedulingapiv1alpha1 "k8s.io/kubernetes/pkg/apis/scheduling/v1alpha1"
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schedulingclient "k8s.io/kubernetes/pkg/client/clientset_generated/internalclientset/typed/scheduling/internalversion"
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priorityclassstore "k8s.io/kubernetes/pkg/registry/scheduling/priorityclass/storage"
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)
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const PostStartHookName = "scheduling/bootstrap-system-priority-classes"
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type RESTStorageProvider struct{}
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var _ genericapiserver.PostStartHookProvider = RESTStorageProvider{}
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func (p RESTStorageProvider) NewRESTStorage(apiResourceConfigSource serverstorage.APIResourceConfigSource, restOptionsGetter generic.RESTOptionsGetter) (genericapiserver.APIGroupInfo, bool) {
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apiGroupInfo := genericapiserver.NewDefaultAPIGroupInfo(scheduling.GroupName, legacyscheme.Registry, legacyscheme.Scheme, legacyscheme.ParameterCodec, legacyscheme.Codecs)
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if apiResourceConfigSource.VersionEnabled(schedulingapiv1alpha1.SchemeGroupVersion) {
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apiGroupInfo.VersionedResourcesStorageMap[schedulingapiv1alpha1.SchemeGroupVersion.Version] = p.v1alpha1Storage(apiResourceConfigSource, restOptionsGetter)
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apiGroupInfo.GroupMeta.GroupVersion = schedulingapiv1alpha1.SchemeGroupVersion
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}
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return apiGroupInfo, true
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}
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func (p RESTStorageProvider) v1alpha1Storage(apiResourceConfigSource serverstorage.APIResourceConfigSource, restOptionsGetter generic.RESTOptionsGetter) map[string]rest.Storage {
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storage := map[string]rest.Storage{}
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// priorityclasses
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priorityClassStorage := priorityclassstore.NewREST(restOptionsGetter)
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storage["priorityclasses"] = priorityClassStorage
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return storage
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}
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func (p RESTStorageProvider) PostStartHook() (string, genericapiserver.PostStartHookFunc, error) {
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return PostStartHookName, AddSystemPriorityClasses(), nil
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}
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func AddSystemPriorityClasses() genericapiserver.PostStartHookFunc {
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priorityClasses := []*scheduling.PriorityClass{
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{
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ObjectMeta: metav1.ObjectMeta{
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Name: scheduling.SystemNodeCritical,
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},
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Value: scheduling.SystemCriticalPriority + 1000,
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Description: "Used for system critical pods that must not be moved from their current node.",
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},
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{
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ObjectMeta: metav1.ObjectMeta{
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Name: scheduling.SystemClusterCritical,
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},
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Value: scheduling.SystemCriticalPriority,
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Description: "Used for system critical pods that must run in the cluster, but can be moved to another node if necessary.",
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},
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}
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return func(hookContext genericapiserver.PostStartHookContext) error {
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// Adding system priority classes is important. If they fail to add, many critical system
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// components may fail and cluster may break.
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err := wait.Poll(1*time.Second, 30*time.Second, func() (done bool, err error) {
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schedClientSet, err := schedulingclient.NewForConfig(hookContext.LoopbackClientConfig)
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if err != nil {
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utilruntime.HandleError(fmt.Errorf("unable to initialize client: %v", err))
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return false, nil
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}
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for _, pc := range priorityClasses {
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_, err := schedClientSet.PriorityClasses().Get(pc.Name, metav1.GetOptions{})
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if err != nil {
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if apierrors.IsNotFound(err) {
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_, err := schedClientSet.PriorityClasses().Create(pc)
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if err != nil {
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return false, err
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} else {
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glog.Infof("created PriorityClass %s with value %v", pc.Name, pc.Value)
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}
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} else {
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// Unable to get the priority class for reasons other than "not found".
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return false, err
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}
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}
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}
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glog.Infof("all system priority classes are created successfully.")
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return true, nil
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})
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// if we're never able to make it through initialization, kill the API server.
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if err != nil {
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return fmt.Errorf("unable to add default system priority classes: %v", err)
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}
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return nil
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}
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}
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func (p RESTStorageProvider) GroupName() string {
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return scheduling.GroupName
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}
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