设置nginx与上游哪吒面板grpc保持连接

docs/guide/q3.md

@@ -17,9 +17,15 @@ server {
     location / {
         grpc_read_timeout 300s;
         grpc_send_timeout 300s;
-        grpc_pass grpc://localhost:5555;
+        grpc_socket_keepalive on;
+        grpc_pass grpc://grpcservers;
     }
 }
+
+upstream grpcservers {
+    server localhost:5555;
+    keepalive 1024;
+}
 ```
 
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