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main.go
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main.go
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package main
import (
"context"
"flag"
"os"
"sync"
"time"
"github.com/kelseyhightower/envconfig"
"github.com/submariner-io/submariner/pkg/cableengine/ipsec"
"github.com/submariner-io/submariner/pkg/controllers/datastoresyncer"
"github.com/submariner-io/submariner/pkg/datastore"
"github.com/submariner-io/submariner/pkg/types"
"github.com/submariner-io/submariner/pkg/util"
v1 "k8s.io/api/core/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/client-go/kubernetes/scheme"
"k8s.io/client-go/rest"
"k8s.io/client-go/tools/leaderelection"
"k8s.io/client-go/tools/leaderelection/resourcelock"
"k8s.io/client-go/tools/record"
kubeInformers "k8s.io/client-go/informers"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/tools/clientcmd"
"k8s.io/klog"
submarinerClientset "github.com/submariner-io/submariner/pkg/client/clientset/versioned"
submarinerInformers "github.com/submariner-io/submariner/pkg/client/informers/externalversions"
"github.com/submariner-io/submariner/pkg/controllers/tunnel"
subk8s "github.com/submariner-io/submariner/pkg/datastore/kubernetes"
"github.com/submariner-io/submariner/pkg/datastore/phpapi"
"github.com/submariner-io/submariner/pkg/signals"
)
var (
localMasterURL string
localKubeconfig string
)
func init() {
flag.StringVar(&localKubeconfig, "kubeconfig", "", "Path to kubeconfig of local cluster. Only required if out-of-cluster.")
flag.StringVar(&localMasterURL, "master", "", "The address of the Kubernetes API server. Overrides any value in kubeconfig. Only required if out-of-cluster.")
}
func main() {
klog.InitFlags(nil)
flag.Parse()
klog.V(2).Info("Starting submariner")
// set up signals so we handle the first shutdown signal gracefully
stopCh := signals.SetupSignalHandler()
var submSpec types.SubmarinerSpecification
err := envconfig.Process("submariner", &submSpec)
if err != nil {
klog.Fatal(err)
}
cfg, err := clientcmd.BuildConfigFromFlags(localMasterURL, localKubeconfig)
if err != nil {
klog.Exitf("Error building kubeconfig: %s", err.Error())
}
kubeClient, err := kubernetes.NewForConfig(cfg)
if err != nil {
klog.Exitf("Error building kubernetes clientset: %s", err.Error())
}
submarinerClient, err := submarinerClientset.NewForConfig(cfg)
if err != nil {
klog.Exitf("Error building submariner clientset: %s", err.Error())
}
kubeInformerFactory := kubeInformers.NewSharedInformerFactoryWithOptions(kubeClient, time.Second*30,
kubeInformers.WithNamespace(submSpec.Namespace))
submarinerInformerFactory := submarinerInformers.NewSharedInformerFactoryWithOptions(submarinerClient, time.Second*30,
submarinerInformers.WithNamespace(submSpec.Namespace))
start := func(context.Context) {
localCluster, err := util.GetLocalCluster(submSpec)
if err != nil {
klog.Fatalf("Fatal error occurred while retrieving local cluster from %#v: %v", submSpec, err)
}
localEndpoint, err := util.GetLocalEndpoint(submSpec.ClusterID, "ipsec", nil, submSpec.NatEnabled,
append(submSpec.ServiceCidr, submSpec.ClusterCidr...), util.GetLocalIP())
if err != nil {
klog.Fatalf("Fatal error occurred while retrieving local endpoint from %#v: %v", submSpec, err)
}
cableEngine, err := ipsec.NewEngine(append(submSpec.ClusterCidr, submSpec.ServiceCidr...), localCluster, localEndpoint)
if err != nil {
klog.Fatalf("Fatal error occurred creating ipsec engine: %v", err)
}
tunnelController := tunnel.NewController(submSpec.Namespace, cableEngine, kubeClient, submarinerClient,
submarinerInformerFactory.Submariner().V1().Endpoints())
var datastore datastore.Datastore
switch submSpec.Broker {
case "phpapi":
secure, err := util.ParseSecure(submSpec.Token)
if err != nil {
klog.Fatalf("Error parsing secure token: %v", err)
}
datastore, err = phpapi.NewPHPAPI(secure.APIKey)
if err != nil {
klog.Fatalf("Error creating PHPAPI datastore: %v", err)
}
case "k8s":
datastore, err = subk8s.NewDatastore(submSpec.ClusterID, stopCh)
if err != nil {
klog.Fatalf("Error creating kubernetes datastore: %v", err)
}
default:
klog.Fatalf("Invalid backend '%s' was specified", submSpec.Broker)
}
klog.V(6).Infof("Creating new datastore syncer")
dsSyncer := datastoresyncer.NewDatastoreSyncer(submSpec.ClusterID, submSpec.Namespace, kubeClient, submarinerClient,
submarinerInformerFactory.Submariner().V1().Clusters(), submarinerInformerFactory.Submariner().V1().Endpoints(), datastore,
submSpec.ColorCodes, localCluster, localEndpoint)
kubeInformerFactory.Start(stopCh)
submarinerInformerFactory.Start(stopCh)
klog.V(4).Infof("Starting controllers")
var wg sync.WaitGroup
wg.Add(3)
go func() {
defer wg.Done()
if err = cableEngine.StartEngine(); err != nil {
klog.Fatalf("Error starting the cable engine: %v", err)
}
}()
go func() {
defer wg.Done()
if err = tunnelController.Run(stopCh); err != nil {
klog.Fatalf("Error running tunnel controller: %v", err)
}
}()
go func() {
defer wg.Done()
if err = dsSyncer.Run(stopCh); err != nil {
klog.Fatalf("Error running datastoresyncer controller: %v", err)
}
}()
wg.Wait()
}
leClient, err := kubernetes.NewForConfig(rest.AddUserAgent(cfg, "leader-election"))
if err != nil {
klog.Fatal(err)
}
eventBroadcaster := record.NewBroadcaster()
eventBroadcaster.StartLogging(klog.V(4).Infof)
recorder := eventBroadcaster.NewRecorder(scheme.Scheme, v1.EventSource{Component: "submariner-controller"})
startLeaderElection(leClient, recorder, start)
klog.Fatal("All controllers stopped or exited. Stopping main loop")
}
func startLeaderElection(leaderElectionClient kubernetes.Interface, recorder record.EventRecorder, run func(ctx context.Context)) {
id, err := os.Hostname()
if err != nil {
klog.Fatalf("error getting hostname: %v", err)
}
kubeconfig := clientcmd.NewNonInteractiveDeferredLoadingClientConfig(
clientcmd.NewDefaultClientConfigLoadingRules(),
&clientcmd.ConfigOverrides{},
)
namespace, _, err := kubeconfig.Namespace()
if err != nil {
klog.Infof("Could not obtain a namespace to use for the leader election lock - the error was: %v. Using the default \"submariner\" namespace.", err)
namespace = "submariner"
} else {
klog.Infof("Using namespace %s for the leader election lock", namespace)
}
// Lock required for leader election
rl := resourcelock.ConfigMapLock{
ConfigMapMeta: metav1.ObjectMeta{
Namespace: namespace,
Name: "submariner-engine-lock",
},
Client: leaderElectionClient.CoreV1(),
LockConfig: resourcelock.ResourceLockConfig{
Identity: id + "-submariner-engine",
EventRecorder: recorder,
},
}
leaderelection.RunOrDie(context.TODO(), leaderelection.LeaderElectionConfig{
Lock: &rl,
LeaseDuration: 15 * time.Second,
RenewDeadline: 10 * time.Second,
RetryPeriod: 3 * time.Second,
Callbacks: leaderelection.LeaderCallbacks{
OnStartedLeading: run,
OnStoppedLeading: func() {
klog.Fatalf("leaderelection lost")
},
},
})
}