Scripts/dynsupdate: Difference between revisions
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This script will update the A records for zones you host on your local Bind9 nameserver to your (external) dynamic IP. Make sure that nsupdate works with a key by testing it manually. | This script will update the A records for zones you host on your local Bind9 nameserver to your (external) dynamic IP. Make sure that nsupdate works with a key by testing it manually. | ||
I'm running this script after every reconnect of my VDSL link through ppp's ip-up scripts by putting it here: | |||
<pre> | |||
/etc/ppp/ip-up.d/dynsupdate | |||
</pre> | |||
'''Notice:''' The here-document lines (between EndOfCommands) have to be indented with tabs, or not indented at all - spaces will not work. | '''Notice:''' The here-document lines (between EndOfCommands) have to be indented with tabs, or not indented at all - spaces will not work. | ||
| Line 8: | Line 13: | ||
SERVER="192.168.0.XXX" | SERVER="192.168.0.XXX" | ||
KEY="/etc/bind/Knsupdate.key" | KEY="/etc/bind/Knsupdate.key" | ||
TTL="300" | |||
IP=`lynx -dump http://checkip.dyndns.org | awk '{print $4}'` | IP=`lynx -dump http://checkip.dyndns.org | awk '{print $4}'` | ||
| Line 22: | Line 28: | ||
COMMANDS="$COMMANDS | COMMANDS="$COMMANDS | ||
update delete ${RECORD}. A | update delete ${RECORD}. A | ||
update add ${RECORD}. | update add ${RECORD}. ${TTL} A ${IP} | ||
" | " | ||
echo "updating record: $RECORD" | echo "updating record: $RECORD" | ||
Latest revision as of 21:10, 26 August 2016
This script will update the A records for zones you host on your local Bind9 nameserver to your (external) dynamic IP. Make sure that nsupdate works with a key by testing it manually.
I'm running this script after every reconnect of my VDSL link through ppp's ip-up scripts by putting it here:
/etc/ppp/ip-up.d/dynsupdate
Notice: The here-document lines (between EndOfCommands) have to be indented with tabs, or not indented at all - spaces will not work.
#!/bin/bash
RECORDS=("example.com" "ns1.example.com" "ns2.example.com" "example.org" "example.net")
SERVER="192.168.0.XXX"
KEY="/etc/bind/Knsupdate.key"
TTL="300"
IP=`lynx -dump http://checkip.dyndns.org | awk '{print $4}'`
if [ -e "/tmp/nsup.IP" ]; then
read OLD_IP < "/tmp/nsup.IP"
else
OLD_IP="0.0.0.0"
fi
if [ "$IP" != "$OLD_IP" ]; then
echo "IP address changed from $OLD_IP to $IP"
for RECORD in ${RECORDS[@]}; do
COMMANDS="$COMMANDS
update delete ${RECORD}. A
update add ${RECORD}. ${TTL} A ${IP}
"
echo "updating record: $RECORD"
done
nsupdate -v -k ${KEY} <<-EndOfCommands
server ${SERVER}
${COMMANDS}
send
EndOfCommands
echo "$IP" > /tmp/nsup.IP
echo "IP updates done"
fi