fix: Leader election

charts/well-known/templates/deployment.yaml

@@ -53,6 +53,12 @@ spec:
           args: [
             "-namespace", "{{ .Release.Namespace }}"
           ]
+          env:
+            - name: POD_NAME
+              valueFrom:
+                fieldRef:
+                  apiVersion: v1
+                  fieldPath: metadata.name
           resources:
             {{- toYaml .Values.resources | nindent 12 }}
       {{- with .Values.nodeSelector }}

charts/well-known/templates/role.yaml

@@ -0,0 +1,30 @@
+apiVersion: rbac.authorization.k8s.io/v1
+kind: Role
+metadata:
+  name: {{ include "well-known.fullname" . }}
+  labels:
+    {{- include "well-known.labels" . | nindent 4 }}
+rules:
+- apiGroups:
+  - ""
+  resources:
+  - services
+  verbs:
+  - watch
+  - list
+  - get
+- apiGroups:
+  - ""
+  resources:
+  - configmaps
+  verbs:
+  - get
+  - update
+- apiGroups:
+  - coordination.k8s.io
+  resources:
+  - leases
+  verbs:
+  - get
+  - create
+  - update

charts/well-known/templates/rolebinding.yaml

@@ -0,0 +1,14 @@
+apiVersion: rbac.authorization.k8s.io/v1
+kind: RoleBinding
+metadata:
+  name: {{ include "well-known.fullname" . }}
+  labels:
+    {{- include "well-known.labels" . | nindent 4 }}
+roleRef:
+  apiGroup: rbac.authorization.k8s.io
+  kind: Role
+  name: {{ include "well-known.fullname" . }}
+subjects:
+- kind: ServiceAccount
+  name: {{ include "well-known.serviceAccountName" . }}
+  namespace: {{ .Release.Namespace }}

charts/well-known/values.yaml

@@ -2,7 +2,7 @@
 # This is a YAML-formatted file.
 # Declare variables to be passed into your templates.
 
-replicaCount: 1
+replicaCount: 2
 
 image:
   repository: ghcr.io/stenic/well-known

server/main.go

@@ -11,7 +11,6 @@ import (
 	"syscall"
 	"time"
 
-	"github.com/google/uuid"
 	v1 "k8s.io/api/core/v1"
 	"k8s.io/apimachinery/pkg/api/errors"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
@@ -39,7 +38,7 @@ func main() {
 	}
 	flag.StringVar(&namespace, "namespace", "default", "namespace")
 	flag.StringVar(&cmName, "configmap", "well-known-generated", "")
-	flag.StringVar(&id, "id", uuid.New().String(), "the holder identity name")
+	flag.StringVar(&id, "id", os.Getenv("POD_NAME"), "the holder identity name")
 	flag.StringVar(&leaseLockName, "lease-lock-name", "well-known", "the lease lock resource name")
 
 	flag.Parse()