Keep healthy frontend pod during releases

deploy/helm/ai-spel-frontend/templates/deployment.yaml

@@ -7,6 +7,13 @@ metadata:
     app.kubernetes.io/instance: {{ .Release.Name }}
 spec:
   replicas: {{ .Values.replicaCount }}
+  minReadySeconds: {{ .Values.deployment.minReadySeconds }}
+  progressDeadlineSeconds: {{ .Values.deployment.progressDeadlineSeconds }}
+  strategy:
+    type: RollingUpdate
+    rollingUpdate:
+      maxUnavailable: {{ .Values.deployment.maxUnavailable }}
+      maxSurge: {{ .Values.deployment.maxSurge }}
   selector:
     matchLabels:
       app.kubernetes.io/instance: {{ .Release.Name }}
@@ -40,11 +47,15 @@ spec:
               port: http
             initialDelaySeconds: 2
             periodSeconds: 5
+            timeoutSeconds: 2
+            failureThreshold: 3
           livenessProbe:
             httpGet:
               path: /healthz
               port: http
             initialDelaySeconds: 5
             periodSeconds: 10
+            timeoutSeconds: 2
+            failureThreshold: 3
           resources:
             {{- toYaml .Values.resources | nindent 12 }}

deploy/helm/ai-spel-frontend/values.yaml

@@ -1,4 +1,10 @@
 replicaCount: 1
+deployment:
+  # Keep the old single replica available until its replacement passes readiness.
+  maxUnavailable: 0
+  maxSurge: 1
+  minReadySeconds: 5
+  progressDeadlineSeconds: 600
 image:
   repository: harbor.k3s.k0.nu/ai-spel/frontend
   pullPolicy: IfNotPresent