Start migration to leases for leader election (kubernetes-sigs#2993)

Author: johngmyers

config/rbac/leader_election_role.yaml

@@ -19,4 +19,20 @@ rules:
     verbs:
       - get
       - update
-      - patch
+      - patch
+  - apiGroups:
+    - "coordination.k8s.io"
+    resources:
+    - leases
+    verbs:
+    - create
+  - apiGroups:
+    - "coordination.k8s.io"
+    resources:
+    - leases
+    resourceNames:
+      - aws-load-balancer-controller-leader
+    verbs:
+      - get
+      - update
+      - patch

helm/aws-load-balancer-controller/templates/rbac.yaml

@@ -14,6 +14,22 @@ rules:
   resources: [configmaps]
   resourceNames: [aws-load-balancer-controller-leader]
   verbs: [get, patch, update]
+- apiGroups:
+  - "coordination.k8s.io"
+  resources:
+  - leases
+  verbs:
+  - create
+- apiGroups:
+  - "coordination.k8s.io"
+  resources:
+  - leases
+  resourceNames:
+  - aws-load-balancer-controller-leader
+  verbs:
+  - get
+  - update
+  - patch
 ---
 apiVersion: rbac.authorization.k8s.io/v1
 kind: RoleBinding

pkg/config/runtime_config.go

@@ -118,7 +118,7 @@ func BuildRuntimeOptions(rtCfg RuntimeConfig, scheme *runtime.Scheme) ctrl.Optio
 		MetricsBindAddress:         rtCfg.MetricsBindAddress,
 		HealthProbeBindAddress:     rtCfg.HealthProbeBindAddress,
 		LeaderElection:             rtCfg.EnableLeaderElection,
-		LeaderElectionResourceLock: resourcelock.ConfigMapsResourceLock,
+		LeaderElectionResourceLock: resourcelock.ConfigMapsLeasesResourceLock,
 		LeaderElectionID:           rtCfg.LeaderElectionID,
 		LeaderElectionNamespace:    rtCfg.LeaderElectionNamespace,
 		Namespace:                  rtCfg.WatchNamespace,