# HG changeset patch
# User Ruslan Ermilov <ru@nginx.com>
# Date 1528918669 -10800
# Node ID faf14dc9ab4dfe17ab8732ea9bd86c6cf81399cd
# Parent  f37d8fb25de5e3c7590d51e8e7d66895d00daf7b
Resolver: require name servers.

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