When you work in a hosting company, DN is probably one of the services with you need to interact every week. With this script you can update automatically one or more of dns zone files : for the serial number : just let bash doing it for u.
Because most of time we are not alone in a hosting company, it’s important to verify that nobody is using the script in the same time. It’s also important to have a tractability of the modifications, so all modifications are archived.
PS : don’t forget to install gawk on your server before !
Now, place to the shell : just launch it like :
./sdu.sh /var/lib/named/master/myzone.com.hosts or
ls /var/lib/master/*.hosts |xargs -l ./sdu.sh for a massive updateYou can also use domains list like :
cat zonelist.txt |xargs -l ./sdu.sh[code]
<strong>You can also put it directly in your path</strong>
<span style="text-decoration: underline;"><strong>The script :</strong></span>
[code]
#!/bin/sh
# Serial DNS Updater by Christophe Casalegno (Brain 0verride)
# christophe.casalegno@digital-network.net
tmpdir="/tmp"
backupdir="/backupdns"
dirlock="/var/run"
datename=`date +"%d-%m-%y-%T"`
zonefile=$1
SCRIPTNAME=`basename $0`
# First verification, process already launched ?
export LOCKSYNC="$dirlock/$SCRIPTNAME.lock"
PID=$$
echo "["`date +"%Y/%m/%d %H:%M:%S"`"] Trying to launch script $0"
if [ -f "$LOCKSYNC" ]
then
echo "Wait : lockfile "$LOCKSYNC" is present. we must verify..."
PIDLOCK=`cat $LOCKSYNC`
if [ -f /proc/$PIDLOCK/exe ]
then
echo "The process is currently running. Launching $SCRIPTNAME aborted."
exit
else
echo "The process doesn't seems currently running anymore. Lauching $SCRIPTNAME"...
rm $LOCKSYNC
fi
fi
echo "Lockingfile creation... "$LOCKSYNC
echo $PID > $LOCKSYNC
# Second verification : backupdir exist ?
if [ -r "$backupdir" ]
then
echo "The backup directory already exist : it's cool, don't worry"
echo "Processing..."
else
echo "The backup directory doesn't exist : Creating backup directory..."
mkdir $backupdir
fixdate=$datename
mkdir $backupdir/$fixdate
fi
cat $zonefile > $backupdir/$fixdate/$zonefile
gawk 'BEGIN{ser=strftime("%Y%m%d",systime() )*100} /[0-9]{9,10}/{sub($1,$1 < ser ? ser : $1+1)}1' "$zonefile" > $tmpdir/$zonefile.tmp
cat $tmpdir/$zonefile.tmp > $zonefile
rm $tmpdir/$zonefile.tmp
You can also download the script from : sdu.sh
Christophe Casalegno
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