fixed permissions; moved masters to data

bind/config/named.conf

   any;
 };
 
-masters "masters-example.com-internal" {
-  10.10.0.1 key "key-internal";
-};
-
-masters "masters-example.com-external" {
-  10.10.0.1 key "key-external";
-};
+include "/etc/bind/config/masters.conf";
 
 options {
   directory "/var/cache/bind";

bind/config/named.conf.local

     any;
   };
   also-notify {
-    "masters-example.com-internal";
+    "masters-internal";
   };
   allow-transfer {
     key "key-internal";
     none;
   };
   also-notify {
-    "masters-example.com-external";
+    "masters-external";
   };
   allow-transfer {
     key "key-external";

data_example/bind/config/masters.conf

+masters "masters-internal" {
+  10.10.0.1 key "key-internal";
+};
+
+masters "masters-external" {
+  10.10.0.1 key "key-external";
+};

data_example/bind/config/named.conf.local.common

 zone "example.com" {
   type master;
-  file "/etc/bind/zones/common/db.example.com";
+  file "/etc/bind/config/common/db.example.com";
 };

data_example/bind/config/named.conf.local.external

 zone "site1.example.com" {
   type master;
-  file "/etc/bind/zones/external/db.site1.example.com";
+  file "/etc/bind/config/external/db.site1.example.com";
 };

data_example/bind/config/named.conf.local.internal

 zone "site1.example.com" {
   type master;
-  file "/etc/bind/zones/internal/db.site1.example.com";
+  file "/etc/bind/config/internal/db.site1.example.com";
 };
 zone "dhcp.site1.example.com" {
   type master;
-  file "/etc/bind/zones/internal/db.dhcp.site1.example.com";
+  file "/etc/bind/config/internal/db.dhcp.site1.example.com";
 };
 zone "100.15.10.in-addr.arpa" {
   type master;
-  file "/etc/bind/zones/internal/db.100.15.10.in-addr.arpa";
+  file "/etc/bind/config/internal/db.100.15.10.in-addr.arpa";
 };