From 7cec1ff8b89cdb80e9a4ac1bd0ebfca0e9da01ac Mon Sep 17 00:00:00 2001
From: Shuwei Hao <shuwei.hsw@alibaba-inc.com>
Date: Wed, 29 May 2019 19:52:07 +0800
Subject: [PATCH] add custom DNS support and avoid overwriting

---
 ack-centos.json      |  3 ++-
 scripts/updateDNS.sh | 10 ++++++++++
 2 files changed, 12 insertions(+), 1 deletion(-)
 create mode 100755 scripts/updateDNS.sh

diff --git a/ack-centos.json b/ack-centos.json
index 49823e7..e1e9eb3 100644
--- a/ack-centos.json
+++ b/ack-centos.json
@@ -28,9 +28,10 @@
         "scripts/reboot.sh",
         "scripts/cleanUpKerneles.sh",
         "config/default.sh",
+        "scripts/updateDNS.sh",
         "scripts/verify.sh"
       ],
       "expect_disconnect": true
     }
   ]
-}
\ No newline at end of file
+}
diff --git a/scripts/updateDNS.sh b/scripts/updateDNS.sh
new file mode 100755
index 0000000..4d17825
--- /dev/null
+++ b/scripts/updateDNS.sh
@@ -0,0 +1,10 @@
+#!/bin/bash
+
+# unlock DNS file in case it was locked
+# chattr -i /etc/resolv.conf
+
+# Using your custom nameserver to replace xxx.xxx.xxx.xxx
+# echo "nameserver xxx.xxx.xxx.xxx\nnameserver xxx.xxx.xxx.xxx" > /etc/resolv.conf
+
+# Keep resolv locked to prevent overwriting by cloudinit/NetworkManager
+# chattr +i /etc/resolv.conf