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Merge pull request #43 from SchSeba/kubevirt_no_restart
Reload instead of restart
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,165 @@ | ||
| /* | ||
| Copyright 2019 The KubeMacPool Authors. | ||
| Licensed under the Apache License, Version 2.0 (the "License"); | ||
| you may not use this file except in compliance with the License. | ||
| You may obtain a copy of the License at | ||
| http://www.apache.org/licenses/LICENSE-2.0 | ||
| Unless required by applicable law or agreed to in writing, software | ||
| distributed under the License is distributed on an "AS IS" BASIS, | ||
| WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| See the License for the specific language governing permissions and | ||
| limitations under the License. | ||
| */ | ||
| package manager | ||
|
|
||
| import ( | ||
| "fmt" | ||
| "k8s.io/client-go/rest" | ||
| "net" | ||
| "os" | ||
| "os/signal" | ||
| "sigs.k8s.io/controller-runtime/pkg/client/config" | ||
| "time" | ||
|
|
||
| "github.com/go-logr/logr" | ||
| "k8s.io/client-go/kubernetes" | ||
| "sigs.k8s.io/controller-runtime/pkg/manager" | ||
| logf "sigs.k8s.io/controller-runtime/pkg/runtime/log" | ||
|
|
||
| "github.com/K8sNetworkPlumbingWG/kubemacpool/pkg/controller" | ||
| poolmanager "github.com/K8sNetworkPlumbingWG/kubemacpool/pkg/pool-manager" | ||
| "github.com/K8sNetworkPlumbingWG/kubemacpool/pkg/webhook" | ||
| ) | ||
|
|
||
| var log logr.Logger | ||
|
|
||
| type KubeMacPoolManager struct { | ||
| clientset *kubernetes.Clientset | ||
| config *rest.Config | ||
| metricsAddr string | ||
| continueToRunManager bool | ||
| restartChannel chan struct{} | ||
| kubevirtInstalledChannel chan struct{} | ||
| stopSignalChannel chan os.Signal | ||
| } | ||
|
|
||
| func NewKubeMacPoolManager(metricsAddr string) *KubeMacPoolManager { | ||
| kubemacpoolManager := &KubeMacPoolManager{ | ||
| continueToRunManager: true, | ||
| restartChannel: make(chan struct{}), | ||
| kubevirtInstalledChannel: make(chan struct{}), | ||
| stopSignalChannel: make(chan os.Signal, 1), | ||
| metricsAddr: metricsAddr} | ||
|
|
||
| signal.Notify(kubemacpoolManager.stopSignalChannel, os.Interrupt, os.Kill) | ||
|
|
||
| return kubemacpoolManager | ||
| } | ||
|
|
||
| func (k *KubeMacPoolManager) Run(rangeStart, rangeEnd net.HardwareAddr) error { | ||
| // setup Pool Manager | ||
| for k.continueToRunManager { | ||
| // Get a config to talk to the apiserver | ||
| var err error | ||
| log.Info("Setting up client for manager") | ||
| k.config, err = config.GetConfig() | ||
| if err != nil { | ||
| return fmt.Errorf("unable to set up client config error %v", err) | ||
| } | ||
|
|
||
| k.clientset, err = kubernetes.NewForConfig(k.config) | ||
| if err != nil { | ||
| return fmt.Errorf("unable to create a kubernetes client error %v", err) | ||
| } | ||
|
|
||
| // create a owner ref on the mutating webhook | ||
| // this way when we remove the statefulset of the manager the webhook will be also removed from the cluster | ||
| err = webhook.CreateOwnerRefForMutatingWebhook(k.clientset) | ||
| if err != nil { | ||
| return fmt.Errorf("unable to create owner reference for mutating webhook object error %v", err) | ||
| } | ||
|
|
||
| isKubevirtInstalled := checkForKubevirt(k.clientset) | ||
| poolManager, err := poolmanager.NewPoolManager(k.clientset, rangeStart, rangeEnd, isKubevirtInstalled) | ||
| if err != nil { | ||
| return fmt.Errorf("unable to create pool manager error %v", err) | ||
| } | ||
|
|
||
| if !isKubevirtInstalled { | ||
| log.Info("kubevirt was not found in the cluster start a watching process") | ||
| go k.waitForKubevirt() | ||
| } | ||
| go k.waitForSignal() | ||
|
|
||
| log.Info("Setting up manager") | ||
| mgr, err := manager.New(k.config, manager.Options{MetricsBindAddress: k.metricsAddr}) | ||
| if err != nil { | ||
| return fmt.Errorf("unable to set up manager error %v", err) | ||
| } | ||
|
|
||
| log.Info("Setting up controller") | ||
| err = controller.AddToManager(mgr, poolManager) | ||
| if err != nil { | ||
| return fmt.Errorf("unable to register controllers to the manager error %v", err) | ||
| } | ||
|
|
||
| err = webhook.AddToManager(mgr, poolManager) | ||
| if err != nil { | ||
| return fmt.Errorf("unable to register webhooks to the manager error %v", err) | ||
| } | ||
|
|
||
| err = mgr.Start(k.restartChannel) | ||
| if err != nil { | ||
| return fmt.Errorf("unable to run the manager error %v", err) | ||
| } | ||
|
|
||
| // restart channels | ||
| k.restartChannel = make(chan struct{}) | ||
| k.kubevirtInstalledChannel = make(chan struct{}) | ||
| } | ||
|
|
||
| return nil | ||
| } | ||
|
|
||
| func checkForKubevirt(kubeClient *kubernetes.Clientset) bool { | ||
| result := kubeClient.ExtensionsV1beta1().RESTClient().Get().RequestURI("/apis/apiextensions.k8s.io/v1beta1/customresourcedefinitions/virtualmachines.kubevirt.io").Do() | ||
| if result.Error() == nil { | ||
| return true | ||
| } | ||
|
|
||
| return false | ||
| } | ||
|
|
||
| // Check for Kubevirt CRD to be available | ||
| func (k *KubeMacPoolManager) waitForKubevirt() { | ||
| for _ = range time.Tick(5 * time.Second) { | ||
| kubevirtExist := checkForKubevirt(k.clientset) | ||
| log.V(1).Info("kubevirt exist in the cluster", "kubevirtExist", kubevirtExist) | ||
| if kubevirtExist { | ||
| close(k.kubevirtInstalledChannel) | ||
| break | ||
| } | ||
| } | ||
| } | ||
|
|
||
| // wait for the any interrupt to stop the manager and clean the webhook. | ||
| func (k *KubeMacPoolManager) waitForSignal() { | ||
| select { | ||
| // This channel is a system interrupt this will stop the container | ||
| case <-k.stopSignalChannel: | ||
| k.continueToRunManager = false | ||
| // This interrupt occurred when kubevirt is installed in the cluster and will restart the manager code only | ||
| // The container will not restart in this scenario | ||
| case <-k.kubevirtInstalledChannel: | ||
| log.Info("found kubevirt restarting the manager") | ||
| } | ||
|
|
||
| close(k.restartChannel) | ||
| } | ||
|
|
||
| func init() { | ||
| log = logf.Log.WithName("manager") | ||
| } |