Allow defining unique election leader id

charts/actions-runner-controller/templates/deployment.yaml

@@ -37,7 +37,12 @@ spec:
         {{- $metricsHost := .Values.metrics.proxy.enabled | ternary "127.0.0.1" "0.0.0.0" }}
         {{- $metricsPort := .Values.metrics.proxy.enabled | ternary "8080" .Values.metrics.port }}
         - "--metrics-addr={{ $metricsHost }}:{{ $metricsPort }}"
+        {{- if .Values.controller.enableLeaderElection }}
         - "--enable-leader-election"
+        {{- end }}
+        {{- if .Values.controller.leaderElectionId }}
+        - "--leader-election-id={{ .Values.controller.leaderElectionId }}"
+        {{- end }}
         - "--sync-period={{ .Values.syncPeriod }}"
         - "--docker-image={{ .Values.image.dindSidecarRepositoryAndTag }}"
         - "--runner-image={{ .Values.image.actionsRunnerRepositoryAndTag }}"

charts/actions-runner-controller/values.yaml

@@ -8,6 +8,12 @@ replicaCount: 1
 
 syncPeriod: 10m
 
+controller:
+  enableLeaderElection: true
+  # Specifies the controller id for leader election.
+  # Must be unique if more than one controller installed.
+  #leaderElectionId: "actions-runner-controller"
+
 # The controller tries its best not to repeat the duplicate GitHub API call
 # within this duration.
 # Defaults to syncPeriod - 10s.

main.go

@@ -65,6 +65,7 @@ func main() {
 
 		metricsAddr          string
 		enableLeaderElection bool
+		leaderElectionId     string
 		syncPeriod           time.Duration
 
 		gitHubAPICacheDuration time.Duration
@@ -87,6 +88,7 @@ func main() {
 	flag.StringVar(&metricsAddr, "metrics-addr", ":8080", "The address the metric endpoint binds to.")
 	flag.BoolVar(&enableLeaderElection, "enable-leader-election", false,
 		"Enable leader election for controller manager. Enabling this will ensure there is only one active controller manager.")
+	flag.StringVar(&leaderElectionId, "leader-election-id", "actions-runner-controller", "Controller id for leader election.")
 	flag.StringVar(&runnerImage, "runner-image", defaultRunnerImage, "The image name of self-hosted runner container.")
 	flag.StringVar(&dockerImage, "docker-image", defaultDockerImage, "The image name of docker sidecar container.")
 	flag.StringVar(&dockerRegistryMirror, "docker-registry-mirror", "", "The default Docker Registry Mirror used by runners.")
@@ -129,7 +131,7 @@ func main() {
 		Scheme:             scheme,
 		MetricsBindAddress: metricsAddr,
 		LeaderElection:     enableLeaderElection,
-		LeaderElectionID:   "actions-runner-controller",
+		LeaderElectionID:   leaderElectionId,
 		Port:               9443,
 		SyncPeriod:         &syncPeriod,
 		Namespace:          namespace,