forked from kubeflow/training-operator
/
server.go
204 lines (174 loc) · 6.49 KB
/
server.go
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// Copyright 2018 The Kubeflow 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 app
import (
"fmt"
"os"
"time"
"github.com/kubeflow/tf-operator/cmd/tf-operator.v1beta2/app/options"
"github.com/kubeflow/tf-operator/pkg/apis/tensorflow/v1beta2"
tfjobclientset "github.com/kubeflow/tf-operator/pkg/client/clientset/versioned"
"github.com/kubeflow/tf-operator/pkg/client/clientset/versioned/scheme"
tfjobinformers "github.com/kubeflow/tf-operator/pkg/client/informers/externalversions"
controller "github.com/kubeflow/tf-operator/pkg/controller.v1beta2/tensorflow"
"github.com/kubeflow/tf-operator/pkg/util/signals"
"github.com/kubeflow/tf-operator/pkg/version"
kubebatchclient "github.com/kubernetes-sigs/kube-batch/pkg/client/clientset/versioned"
log "github.com/sirupsen/logrus"
"k8s.io/api/core/v1"
"k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
kubeinformers "k8s.io/client-go/informers"
kubeclientset "k8s.io/client-go/kubernetes"
restclientset "k8s.io/client-go/rest"
"k8s.io/client-go/tools/clientcmd"
election "k8s.io/client-go/tools/leaderelection"
"k8s.io/client-go/tools/leaderelection/resourcelock"
"k8s.io/client-go/tools/record"
)
const (
apiVersion = "v1beta2"
)
var (
// leader election config
leaseDuration = 15 * time.Second
renewDuration = 5 * time.Second
retryPeriod = 3 * time.Second
resyncPeriod = 30 * time.Second
)
const RecommendedKubeConfigPathEnv = "KUBECONFIG"
func Run(opt *options.ServerOption) error {
// Check if the -version flag was passed and, if so, print the version and exit.
if opt.PrintVersion {
version.PrintVersionAndExit(apiVersion)
}
namespace := os.Getenv(v1beta2.EnvKubeflowNamespace)
if len(namespace) == 0 {
log.Infof("EnvKubeflowNamespace not set, use default namespace")
namespace = metav1.NamespaceDefault
}
if opt.Namespace == v1.NamespaceAll {
log.Info("Using cluster scoped operator")
} else {
log.Infof("Scoping operator to namespace %s", opt.Namespace)
}
// To help debugging, immediately log version.
log.Infof("%+v", version.Info(apiVersion))
// Set up signals so we handle the first shutdown signal gracefully.
stopCh := signals.SetupSignalHandler()
// Note: ENV KUBECONFIG will overwrite user defined Kubeconfig option.
if len(os.Getenv(RecommendedKubeConfigPathEnv)) > 0 {
// use the current context in kubeconfig
// This is very useful for running locally.
opt.Kubeconfig = os.Getenv(RecommendedKubeConfigPathEnv)
}
// Get kubernetes config.
kcfg, err := clientcmd.BuildConfigFromFlags(opt.MasterURL, opt.Kubeconfig)
if err != nil {
log.Fatalf("Error building kubeconfig: %s", err.Error())
}
// Create clients.
kubeClientSet, leaderElectionClientSet, tfJobClientSet, kubeBatchClientSet, err := createClientSets(kcfg)
if err != nil {
return err
}
if !checkCRDExists(tfJobClientSet, opt.Namespace) {
log.Info("CRD doesn't exist. Exiting")
os.Exit(1)
}
// Create informer factory.
kubeInformerFactory := kubeinformers.NewFilteredSharedInformerFactory(kubeClientSet, resyncPeriod, opt.Namespace, nil)
tfJobInformerFactory := tfjobinformers.NewSharedInformerFactory(tfJobClientSet, resyncPeriod)
unstructuredInformer := controller.NewUnstructuredTFJobInformer(kcfg, opt.Namespace)
// Create tf controller.
tc := controller.NewTFController(unstructuredInformer, kubeClientSet, kubeBatchClientSet, tfJobClientSet, kubeInformerFactory, tfJobInformerFactory, *opt)
// Start informer goroutines.
go kubeInformerFactory.Start(stopCh)
// We do not use the generated informer because of
// https://github.com/kubeflow/tf-operator/issues/561
// go tfJobInformerFactory.Start(stopCh)
go unstructuredInformer.Informer().Run(stopCh)
// Set leader election start function.
run := func(<-chan struct{}) {
if err := tc.Run(opt.Threadiness, stopCh); err != nil {
log.Errorf("Failed to run the controller: %v", err)
}
}
id, err := os.Hostname()
if err != nil {
return fmt.Errorf("failed to get hostname: %v", err)
}
// Prepare event clients.
eventBroadcaster := record.NewBroadcaster()
if err = v1.AddToScheme(scheme.Scheme); err != nil {
return fmt.Errorf("CoreV1 Add Scheme failed: %v", err)
}
recorder := eventBroadcaster.NewRecorder(scheme.Scheme, v1.EventSource{Component: "tf-operator"})
rl := &resourcelock.EndpointsLock{
EndpointsMeta: metav1.ObjectMeta{
Namespace: namespace,
Name: "tf-operator",
},
Client: leaderElectionClientSet.CoreV1(),
LockConfig: resourcelock.ResourceLockConfig{
Identity: id,
EventRecorder: recorder,
},
}
// Start leader election.
election.RunOrDie(election.LeaderElectionConfig{
Lock: rl,
LeaseDuration: leaseDuration,
RenewDeadline: renewDuration,
RetryPeriod: retryPeriod,
Callbacks: election.LeaderCallbacks{
OnStartedLeading: run,
OnStoppedLeading: func() {
log.Fatalf("leader election lost")
},
},
})
return nil
}
func createClientSets(config *restclientset.Config) (kubeclientset.Interface, kubeclientset.Interface, tfjobclientset.Interface, kubebatchclient.Interface, error) {
kubeClientSet, err := kubeclientset.NewForConfig(restclientset.AddUserAgent(config, "tf-operator"))
if err != nil {
return nil, nil, nil, nil, err
}
leaderElectionClientSet, err := kubeclientset.NewForConfig(restclientset.AddUserAgent(config, "leader-election"))
if err != nil {
return nil, nil, nil, nil, err
}
tfJobClientSet, err := tfjobclientset.NewForConfig(config)
if err != nil {
return nil, nil, nil, nil, err
}
kubeBatchClientSet, err := kubebatchclient.NewForConfig(restclientset.AddUserAgent(config, "kube-batch"))
if err != nil {
return nil, nil, nil, nil, err
}
return kubeClientSet, leaderElectionClientSet, tfJobClientSet, kubeBatchClientSet, nil
}
func checkCRDExists(clientset tfjobclientset.Interface, namespace string) bool {
_, err := clientset.KubeflowV1beta2().TFJobs(namespace).List(metav1.ListOptions{})
if err != nil {
log.Error(err)
if _, ok := err.(*errors.StatusError); ok {
if errors.IsNotFound(err) {
return false
}
}
}
return true
}