Added OPTIONS="-4 -u bind" for ubuntu /etc/default and OPTIONS="-4 -u named" for centos.

dns/files/bind9

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+# run resolvconf?
+RESOLVCONF=yes
+
+# startup options for the server
+OPTIONS="-4 -u bind"

dns/files/named

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+# BIND named process options
+# ~~~~~~~~~~~~~~~~~~~~~~~~~~
+# Currently, you can use the following options:
+#
+# ROOTDIR="/some/where"  --  will run named in a chroot environment.
+#                            you must set up the chroot environment 
+#                            (install the bind-chroot package) before
+#                            doing this.
+#
+# OPTIONS="whatever"     --  These additional options will be passed to named
+#                            at startup. Don't add -t here, use ROOTDIR instead.
+#
+# ENABLE_ZONE_WRITE=yes  --  If SELinux is disabled, then allow named to write
+#                            its zone files and create files in its $ROOTDIR/var/named
+#                            directory, necessary for DDNS and slave zone transfers.
+#                            Slave zones should reside in the $ROOTDIR/var/named/slaves
+#                            directory, in which case you would not need to enable zone
+#                            writes. If SELinux is enabled, you must use only the 
+#                            'named_write_master_zones' variable to enable zone writes.
+#
+# ENABLE_SDB=yes         --  This enables use of 'named_sdb', which has support
+#		         --  for the ldap, pgsql and dir zone database backends
+#		         --  compiled in, to be used instead of named.
+#
+# DISABLE_NAMED_DBUS=[1y]--  If NetworkManager is enabled in any runlevel, then 
+# 			     the initscript will by default enable named's D-BUS
+#			     support with the named -D option. This setting disables
+#			     this behavior.
+#
+# KEYTAB_FILE="/dir/file"    --  Specify named service keytab file (for GSS-TSIG)
+#
+# DISABLE_ZONE_CHECKING  --  By default, initscript calls named-checkzone
+# 			     utility for every zone to ensure all zones are
+# 			     valid before named starts. If you set this option
+# 			     to 'yes' then initscript doesn't perform those checks.
+#
+ROOTDIR=/var/named/chroot
+
+# startup options for the server
+OPTIONS="-4 -u named"