From d743b26b290a8bcd09f173c8fc6935773bf8b5aa Mon Sep 17 00:00:00 2001
From: Kilian Cavalotti <kilian@stanford.edu>
Date: Mon, 18 Dec 2017 17:15:01 -0800
Subject: [PATCH] mkresolvconf: avoid duplicate nameservers

---
 xCAT/postscripts/mkresolvconf | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/xCAT/postscripts/mkresolvconf b/xCAT/postscripts/mkresolvconf
index 65276b101..39cf9c06a 100755
--- a/xCAT/postscripts/mkresolvconf
+++ b/xCAT/postscripts/mkresolvconf
@@ -27,7 +27,8 @@ if [ -n "$master" ] && [ -n "$domain" ]; then
 	echo "search $domain" >$conf_file
     if [[ "$nameservers" != "" ]]; then
         for ns in ${nameservers//,/ }; do
-    	    echo "nameserver ${ns/<xcatmaster>/$master}" >>$conf_file
+    	    grep -q $ns $conf_file || \
+                echo "nameserver ${ns/<xcatmaster>/$master}" >>$conf_file
         done
     else
         echo "nameserver $master" >>$conf_file