fix backend cm

kpl/cfg-kpl-nginx.yaml

@@ -16,6 +16,7 @@ data:
           proxy_pass http://kpl--frontend.kpl.svc.cluster.local:80$request_uri;
         }
         location ^~ /api/v1 {
+            resolver kube-dns.kube-system.svc.cluster.local valid=5s;
             proxy_pass http://kpl--backend.kpl.svc.cluster.local:8919$request_uri;
             proxy_set_header Host $host;
             proxy_connect_timeout 10s;