move leader election configuration into component configuration

Signed-off-by: Mike Danese <mikedanese@google.com>

pkg/apis/componentconfig/types.go

@@ -62,3 +62,28 @@ const (
 	ProxyModeUserspace ProxyMode = "userspace"
 	ProxyModeIPTables  ProxyMode = "iptables"
 )
+
+// LeaderElectionConfiguration defines the configuration of leader election
+// clients for components that can run with leader election enabled.
+type LeaderElectionConfiguration struct {
+	// leaderElect enables a leader election client to gain leadership
+	// before executing the main loop. Enable this when running replicated
+	// components for high availability.
+	LeaderElect bool `json:"leaderElect"`
+	// leaseDuration is the duration that non-leader candidates will wait
+	// after observing a leadership renewal until attempting to acquire
+	// leadership of a led but unrenewed leader slot. This is effectively the
+	// maximum duration that a leader can be stopped before it is replaced
+	// by another candidate. This is only applicable if leader election is
+	// enabled.
+	LeaseDuration unversioned.Duration `json:"leaseDuration"`
+	// renewDeadline is the interval between attempts by the acting master to
+	// renew a leadership slot before it stops leading. This must be less
+	// than or equal to the lease duration. This is only applicable if leader
+	// election is enabled.
+	RenewDeadline unversioned.Duration `json:"renewDeadline"`
+	// retryPeriod is the duration the clients should wait between attempting
+	// acquisition and renewal of a leadership. This is only applicable if
+	// leader election is enabled.
+	RetryPeriod unversioned.Duration `json:"retryPeriod"`
+}

pkg/client/leaderelection/leaderelection.go

@@ -57,6 +57,7 @@ import (
 	"k8s.io/kubernetes/pkg/api"
 	"k8s.io/kubernetes/pkg/api/errors"
 	"k8s.io/kubernetes/pkg/api/unversioned"
+	"k8s.io/kubernetes/pkg/apis/componentconfig"
 	"k8s.io/kubernetes/pkg/client/record"
 	client "k8s.io/kubernetes/pkg/client/unversioned"
 	"k8s.io/kubernetes/pkg/util"
@@ -331,41 +332,32 @@ func (l *LeaderElector) maybeReportTransition() {
 	}
 }
 
-func DefaultLeaderElectionCLIConfig() LeaderElectionCLIConfig {
-	return LeaderElectionCLIConfig{
+func DefaultLeaderElectionConfiguration() componentconfig.LeaderElectionConfiguration {
+	return componentconfig.LeaderElectionConfiguration{
 		LeaderElect:   false,
-		LeaseDuration: DefaultLeaseDuration,
-		RenewDeadline: DefaultRenewDeadline,
-		RetryPeriod:   DefaultRetryPeriod,
+		LeaseDuration: unversioned.Duration{DefaultLeaseDuration},
+		RenewDeadline: unversioned.Duration{DefaultRenewDeadline},
+		RetryPeriod:   unversioned.Duration{DefaultRetryPeriod},
 	}
 }
 
-// LeaderElectionCLIConfig is useful for embedding into component configuration objects
-// to maintain consistent command line flags.
-type LeaderElectionCLIConfig struct {
-	LeaderElect   bool
-	LeaseDuration time.Duration
-	RenewDeadline time.Duration
-	RetryPeriod   time.Duration
-}
-
 // BindFlags binds the common LeaderElectionCLIConfig flags to a flagset
-func (l *LeaderElectionCLIConfig) BindFlags(fs *pflag.FlagSet) {
+func BindFlags(l *componentconfig.LeaderElectionConfiguration, fs *pflag.FlagSet) {
 	fs.BoolVar(&l.LeaderElect, "leader-elect", l.LeaderElect, ""+
 		"Start a leader election client and gain leadership before "+
 		"executing scheduler loop. Enable this when running replicated "+
 		"schedulers.")
-	fs.DurationVar(&l.LeaseDuration, "leader-elect-lease-duration", l.LeaseDuration, ""+
+	fs.DurationVar(&l.LeaseDuration.Duration, "leader-elect-lease-duration", l.LeaseDuration.Duration, ""+
 		"The duration that non-leader candidates will wait after observing a leadership"+
 		"renewal until attempting to acquire leadership of a led but unrenewed leader "+
 		"slot. This is effectively the maximum duration that a leader can be stopped "+
 		"before it is replaced by another candidate. This is only applicable if leader "+
 		"election is enabled.")
-	fs.DurationVar(&l.RenewDeadline, "leader-elect-renew-deadline", l.RenewDeadline, ""+
+	fs.DurationVar(&l.RenewDeadline.Duration, "leader-elect-renew-deadline", l.RenewDeadline.Duration, ""+
 		"The interval between attempts by the acting master to renew a leadership slot "+
 		"before it stops leading. This must be less than or equal to the lease duration. "+
 		"This is only applicable if leader election is enabled.")
-	fs.DurationVar(&l.RetryPeriod, "leader-elect-retry-period", l.RetryPeriod, ""+
+	fs.DurationVar(&l.RetryPeriod.Duration, "leader-elect-retry-period", l.RetryPeriod.Duration, ""+
 		"The duration the clients should wait between attempting acquisition and renewal "+
 		"of a leadership. This is only applicable if leader election is enabled.")
 }

plugin/cmd/kube-scheduler/app/options/options.go

@@ -21,6 +21,7 @@ import (
 	"net"
 
 	"k8s.io/kubernetes/pkg/api"
+	"k8s.io/kubernetes/pkg/apis/componentconfig"
 	"k8s.io/kubernetes/pkg/client/leaderelection"
 	"k8s.io/kubernetes/pkg/master/ports"
 	"k8s.io/kubernetes/plugin/pkg/scheduler/factory"
@@ -42,7 +43,7 @@ type SchedulerServer struct {
 	KubeAPIQPS        float32
 	KubeAPIBurst      int
 	SchedulerName     string
-	LeaderElection    leaderelection.LeaderElectionCLIConfig
+	LeaderElection    componentconfig.LeaderElectionConfiguration
 }
 
 // NewSchedulerServer creates a new SchedulerServer with default parameters
@@ -56,7 +57,7 @@ func NewSchedulerServer() *SchedulerServer {
 		KubeAPIQPS:        50.0,
 		KubeAPIBurst:      100,
 		SchedulerName:     api.DefaultSchedulerName,
-		LeaderElection:    leaderelection.DefaultLeaderElectionCLIConfig(),
+		LeaderElection:    leaderelection.DefaultLeaderElectionConfiguration(),
 	}
 	return &s
 }
@@ -75,5 +76,5 @@ func (s *SchedulerServer) AddFlags(fs *pflag.FlagSet) {
 	fs.Float32Var(&s.KubeAPIQPS, "kube-api-qps", s.KubeAPIQPS, "QPS to use while talking with kubernetes apiserver")
 	fs.IntVar(&s.KubeAPIBurst, "kube-api-burst", s.KubeAPIBurst, "Burst to use while talking with kubernetes apiserver")
 	fs.StringVar(&s.SchedulerName, "scheduler-name", s.SchedulerName, "Name of the scheduler, used to select which pods will be processed by this scheduler, based on pod's annotation with key 'scheduler.alpha.kubernetes.io/name'")
-	s.LeaderElection.BindFlags(fs)
+	leaderelection.BindFlags(&s.LeaderElection, fs)
 }

plugin/cmd/kube-scheduler/app/server.go

@@ -136,9 +136,9 @@ func Run(s *options.SchedulerServer) error {
 		Client:        kubeClient,
 		Identity:      id,
 		EventRecorder: config.Recorder,
-		LeaseDuration: s.LeaderElection.LeaseDuration,
-		RenewDeadline: s.LeaderElection.RenewDeadline,
-		RetryPeriod:   s.LeaderElection.RetryPeriod,
+		LeaseDuration: s.LeaderElection.LeaseDuration.Duration,
+		RenewDeadline: s.LeaderElection.RenewDeadline.Duration,
+		RetryPeriod:   s.LeaderElection.RetryPeriod.Duration,
 		Callbacks: leaderelection.LeaderCallbacks{
 			OnStartedLeading: run,
 			OnStoppedLeading: func() {