Controller: Make Leader Election TTL configurable. (#11142)

* feature(leader_ttl): feature to customize ttl to leader be re-elected

* fix(review): docs

internal/ingress/controller/controller.go

@@ -91,6 +91,7 @@ type Configuration struct {
 	UpdateStatus           bool
 	UseNodeInternalIP      bool
 	ElectionID             string
+	ElectionTTL            time.Duration
 	UpdateStatusOnShutdown bool
 
 	HealthCheckHost string

internal/ingress/controller/nginx.go

@@ -274,8 +274,9 @@ func (n *NGINXController) Start() {
 	if !n.cfg.DisableLeaderElection {
 		electionID := n.cfg.ElectionID
 		setupLeaderElection(&leaderElectionConfig{
-			Client:     n.cfg.Client,
-			ElectionID: electionID,
+			Client:      n.cfg.Client,
+			ElectionID:  electionID,
+			ElectionTTL: n.cfg.ElectionTTL,
 			OnStartedLeading: func(stopCh chan struct{}) {
 				if n.syncStatus != nil {
 					go n.syncStatus.Run(stopCh)

internal/ingress/controller/status.go

@@ -36,7 +36,8 @@ import (
 type leaderElectionConfig struct {
 	Client clientset.Interface
 
-	ElectionID string
+	ElectionID  string
+	ElectionTTL time.Duration
 
 	OnStartedLeading func(chan struct{})
 	OnStoppedLeading func()
@@ -107,13 +108,11 @@ func setupLeaderElection(config *leaderElectionConfig) {
 		LockConfig: resourceLockConfig,
 	}
 
-	ttl := 30 * time.Second
-
 	elector, err = leaderelection.NewLeaderElector(leaderelection.LeaderElectionConfig{
 		Lock:          lock,
-		LeaseDuration: ttl,
-		RenewDeadline: ttl / 2,
-		RetryPeriod:   ttl / 4,
+		LeaseDuration: config.ElectionTTL,
+		RenewDeadline: config.ElectionTTL / 2,
+		RetryPeriod:   config.ElectionTTL / 4,
 
 		Callbacks: callbacks,
 	})