2015-02-08



Another productive day. :-)

Since dyndns.org stopped their gratis service (or rather made  it
so annoying that it was equal to stopping it), I wanted to have a
replacement. I didn't want to switch to some other free provider,
as  this wouldn't have changed the situation, instead I wanted to
run my own service for myself and possibly for some friends  that
don't  have  the technical requirements to run it themselves. To-
day, finally, I managed to implement it. :-)

I followed roughly these two tutorials:  [0] [1]

The file /etc/bind/named.conf.local includes this section:

     zone "ddns.example.org" {
         type master;
         file "/etc/bind/zone.ddns.example.org";
         update-policy {
             grant ddns-key.ddns.example.org subdomain ddns.example.org. A;
         };
     };

And /etc/bind/zone.ddns.example.org was created  with  this  con-
tent:

     $ORIGIN .
     $TTL 60 ; 1 minute
     ddns.example.org  IN SOA  example.org. hostmaster.example.org. (
                     2015020801 ; serial
                     3600       ; refresh (1 hour)
                     1800       ; retry (30 minutes)
                     2419200    ; expire (4 weeks)
                     1800       ; minimum (30 minutes)
     )
                     NS      example.org.
                     MX      10 mail.example.org.
     $ORIGIN ddns.example.org.

The zone file and the directory it is located must  be  writeable
for named. (It creates zone.ddns.example.org.jnl when updates are
received, and writes them into the original file  every  now  and
then.)

To update the A records (which are appended to the zone file),  I
wrote  a  script  named  `ddns-update'  that  resides on the name
server:

     #!/bin/sh

     if [ $# -ne 2 ] ; then
             echo "Usage: ddns-update NAME IP" >&2
             exit 1
     fi

     nsupdate -k /home/meillo/ddns-key.ddns.example.org <<!
     zone ddns.example.org
     update delete $1.ddns.example.org
     update add $1.ddns.example.org 5 A $2
     send
     !

From the local client (which has a dynamic IP address), I  invoke
the `ddns-submit' script in regular intervals:

     #!/bin/sh

     name="`hostname`"
     ip="`curl -s http://tmp.marmaro.de/ip.php`"

     ssh example.org "ddns-update \"$name\" \"$ip\""

Now I have remote access to my home server again.


Friends who want to use my ddns service are welcome to ask. ;-)

[0]  https://emanuelduss.ch/2013/07/eigener-dynamischer-dns-
ddns-service-betreiben-eigenes-dyndns/
[1]  http://feitel.indeedgeek.de/2012/8/dyndns_selbstgebacken/


http://marmaro.de/lue/        markus schnalke <meillo@marmaro.de>