diff --git a/jails/create.sh b/jails/create.sh
index 00914cc..3523fe4 100755
--- a/jails/create.sh
+++ b/jails/create.sh
@@ -166,6 +166,7 @@ fi
 if ! (($JAILSRC)); then
 	echo "removing /usr/src files ... Ignore failure of removing . and .."
 	iocage exec $JAIL "rm -rf /usr/src/* ; rm -f /usr/src/.*"
+    iocage fstab -a $JAIL /usr/src /usr/src nullfs ro 0 0
 	iocage exec $JAIL "[ -f /mnt/config/freebsd-update.conf ] && cp /mnt/config/freebsd-update.conf /etc/ || cp /mnt/common/freebsd-update.conf /etc/"
 fi
 
diff --git a/jails/update.sh b/jails/update.sh
index 7fa78c0..0a897bc 100755
--- a/jails/update.sh
+++ b/jails/update.sh
@@ -8,6 +8,8 @@
 #
 #
 
+SWREL="12.2-RELEASE"
+
 update_jail ()
 {
     echo "######## ## JAIL:::: $JAIL ##"
@@ -22,7 +24,7 @@ update_jail ()
     iocage exec $JAIL "freebsd-version"
 
     if [[ $1 == "upgrade" ]]; then
-        iocage upgrade -r 12.2-RELEASE $JAIL
+        iocage upgrade -r $SWREL $JAIL
         # pkgp.conf updated to new release after an upgrade
         iocage exec $JAIL "[ -f /mnt/config/pkgp.conf ] && cp /mnt/config/pkgp.conf /usr/local/etc/pkg/repos/ || cp /mnt/common/pkgp.conf /usr/local/etc/pkg/repos/"
         iocage exec $JAIL "pkg-static upgrade -f -y"
@@ -39,7 +41,7 @@ update_jail ()
 
 #    iocage exec $JAIL "rm -rf /var/tmp/temproot*"
 #    iocage exec $JAIL "mergemaster -a"
-    iocage exec $JAIL "etcupdate -t /mnt/common/current-src.bzip2"
+    iocage exec $JAIL "etcupdate -t /mnt/common/$SWREL.bzip2"
 
     iocage exec $JAIL "freebsd-version"
 
@@ -47,9 +49,9 @@ update_jail ()
     #read -p "continue, ctrl-c to abort? " RESP
 }
 
-iocage fetch -U -r 12.2-RELEASE
-etcupdate build current-src.bzip2
-mv current-src.bzip2 /root/FreeBSD/jails/configs/common/
+iocage fetch -U -r $SWREL
+etcupdate build $SWREL.bzip2
+mv $SWREL.bzip2 /root/FreeBSD/jails/configs/common/
 
 read -p "update pkgp packages first (y/N)? " RESP
 if [ ! -z $RESP ] && [ $RESP == "y" ]; then
@@ -76,7 +78,7 @@ fi
 
 echo "update base system by running:"
 echo "freebsd-update fetch"
-# echo "freebsd-update upgrade -r 13.0-RELEASE"
+# echo "freebsd-update upgrade -r $SWREL"
 echo "freebsd-update install"
 # echo "pkg bootstrap -f ; pkg update ; pkg upgrade"
 echo "cd /usr/src; svn update; make -j8 buildkernel KERNCONF=diyIT && make -j8 installkernel KERNCONF=diyIT"
@@ -84,6 +86,6 @@ echo "reboot"
 echo "pkg-static upgrade -f"
 #echo "rm -rf /var/tmp/temproot*"
 #echo "mergemaster -a"
-echo "etcupdate -t /mnt/common/current-src.bzip2"
+echo "etcupdate -t /mnt/common/$SWREL.bzip2"
 
 echo "/root/FreeBSD/scripts/zfs-prune-snapshots -vn -p 'ioc_update' 1d | grep removing"