diff --git a/manifests/blog-app/clusterIssuer.yaml b/manifests/blog-app/clusterIssuer.yaml
new file mode 100644
index 0000000..c0eb550
--- /dev/null
+++ b/manifests/blog-app/clusterIssuer.yaml
@@ -0,0 +1,15 @@
+apiVersion: cert-manager.io/v1
+kind: ClusterIssuer
+metadata:
+  name: letsencrypt-prod-cluster
+  namespace: istio-system
+spec:
+  acme:
+    email: tunacinsoy@gmail.com
+    server: https://acme-v02.api.letsencrypt.org/directory
+    privateKeySecretRef:
+      name: letsencrypt-prod-cluster
+    solvers:
+    - http01:
+        ingress:
+          class: istio
\ No newline at end of file