update

kubespray/roles/kubernetes/preinstall/templates/dhclient_dnsupdate_rh.sh.j2

@@ -0,0 +1,17 @@
+#!/bin/sh
+#
+# Prepend resolver options to /etc/resolv.conf after dhclient`
+# regenerates the file. See man (5) resolver for more details.
+#
+zdnsupdate_config() {
+  if [ -n "$new_domain_search" -o -n "$new_domain_name_servers" ]; then
+    RESOLV_CONF=$(cat /etc/resolv.conf | sed -r '/^options (timeout|attempts|ndots).*$/d')
+    OPTIONS="options timeout:{{ dns_timeout|default('2') }} attempts:{{ dns_attempts|default('2') }} ndots:{{ ndots }}"
+
+    echo -e "$RESOLV_CONF\n$OPTIONS" > /etc/resolv.conf
+  fi
+}
+
+zdnsupdate_restore() {
+  :
+}