diff --git a/docker/serverless/Dockerfile.with_config b/docker/serverless/Dockerfile.with_config
new file mode 100644
index 000000000..0b933f575
--- /dev/null
+++ b/docker/serverless/Dockerfile.with_config
@@ -0,0 +1,7 @@
+# Serverless ESP docker image with build-in service config
+FROM _SERVERLESS_IMAGE
+
+ENV ENDPOINTS_SERVICE_PATH /etc/nginx/service.json
+COPY service.json ${ENDPOINTS_SERVICE_PATH}
+
+ENTRYPOINT ["/env-start-esp.py"]
diff --git a/docker/serverless/env-start-esp.py b/docker/serverless/env-start-esp.py
index 61ec06343..f64a37311 100755
--- a/docker/serverless/env-start-esp.py
+++ b/docker/serverless/env-start-esp.py
@@ -68,21 +68,29 @@ def main():
     assert_env_var("PORT")
     ARGS.append("--http_port={}".format(os.environ["PORT"]))
 
-    try:
-        assert_env_var("ENDPOINTS_SERVICE_NAME")
-    except KeyError as error:
-        serve_error_msg(error.message)
-    ARGS.append("--service={}".format(os.environ["ENDPOINTS_SERVICE_NAME"]))
-
-    if "ENDPOINTS_SERVICE_VERSION" in os.environ:
+    if "ENDPOINTS_SERVICE_PATH" in os.environ:
         ARGS.extend(
             [
                 "--rollout_strategy=fixed",
-                "--version={}".format(os.environ["ENDPOINTS_SERVICE_VERSION"]),
+                "--service_json_path={}".format(os.environ["ENDPOINTS_SERVICE_PATH"]),
             ]
         )
     else:
-        ARGS.append("--rollout_strategy=managed")
+        try:
+            assert_env_var("ENDPOINTS_SERVICE_NAME")
+        except KeyError as error:
+            serve_error_msg(error.message)
+        ARGS.append("--service={}".format(os.environ["ENDPOINTS_SERVICE_NAME"]))
+
+        if "ENDPOINTS_SERVICE_VERSION" in os.environ:
+            ARGS.extend(
+                [
+                    "--rollout_strategy=fixed",
+                    "--version={}".format(os.environ["ENDPOINTS_SERVICE_VERSION"]),
+                ]
+             )
+        else:
+            ARGS.append("--rollout_strategy=managed")
 
     if "CORS_PRESET" in os.environ:
         ARGS.append("--cors_preset={}".format(os.environ["CORS_PRESET"]))
diff --git a/start_esp/start_esp.py b/start_esp/start_esp.py
index fab43d9e0..2fda9d6bc 100755
--- a/start_esp/start_esp.py
+++ b/start_esp/start_esp.py
@@ -968,8 +968,6 @@ def enforce_conflict_args(args):
             return "Flag --enable_backend_routing cannot be used together with --service_control_url_override."
         if args.metadata != METADATA_ADDRESS:
             return "Flag --enable_backend_routing cannot be used together with --metadata."
-        if args.service_json_path:
-            return "Flag --enable_backend_routing cannot be used together with --service_json_path."
         if args.worker_processes != DEFAULT_WORKER_PROCESSES:
             return "Flag --enable_backend_routing cannot be used together with --worker_processes."
         if args.rewrite: