From 63e8a1d926251469b708c6248c3b1849bd018b40 Mon Sep 17 00:00:00 2001
From: Ruslan Ermilov <ru@nginx.com>
Date: Wed, 13 Jun 2018 22:37:49 +0300
Subject: [PATCH] Resolver: require name servers.

---
 src/core/ngx_resolver.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/core/ngx_resolver.c b/src/core/ngx_resolver.c
index 1e4b4110c..d96970434 100644
--- a/src/core/ngx_resolver.c
+++ b/src/core/ngx_resolver.c
@@ -275,6 +275,11 @@ ngx_resolver_create(ngx_conf_t *cf, ngx_str_t *names, ngx_uint_t n)
         }
     }
 
+    if (n && r->connections.nelts == 0) {
+        ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "no name servers defined");
+        return NULL;
+    }
+
     return r;
 }