Add dynamic DNS service updater

I'm going to be adding a VPN gateway to the fileserver so I can access it over the internet. I have an account at DynDNS that will map the WAN address of my router to my DynDNS domain name. I need a simple client on the LAN to update this account when the WAN address changes.

The simplest client recommened at DynDNS seems to be inadyn which I installed on the fileserver

fileserver:~# apt-get install inadyn

I generated the required config file automatically using the DynDNS tool and saved it on the fileserver at /etc/inadyn.conf.

fileserver:~# cat /etc/inadyn.conf
## inadyn configuration file
update_period_sec 600 # Check for a new IP every 600 seconds

# DynDNS username and password here
username xxxxxx
password xxxxxx

dyndns_system dyndns@dyndns.org

## Dynamic DNS hosts
alias flabby.is-a-geek.com

background

I tested the update process by running inadyn from the command line -

fileserver:~# inadyn
INADYN: Started 'INADYN version 1.96' - dynamic DNS updater.
I:INADYN: IP address for alias 'flabby.is-a-geek.com' needs update to '65.93.163.244'
I:INADYN: Alias 'flabby.is-a-geek.com' to IP '65.93.163.244' updated successful.

I added the line -

background

to the end of /etc/inadyn.conf which causes the process to run in the background and the output to be sent to syslog.

I then set up the required scripts to run inadyn correctly at boot time.

cp /etc/init.d/skeleton /etc/init.d/inadyn
chmod 755 /etc/init.d/inadyn

I changed only the line -

NAME=inadyn

and then tested with -

fileserver:~# /etc/init.d/inadyn start
fileserver:~# ps -ef | grep /etc/init.d/inadyn
root 3275 1 0 18:29 ? 00:00:00 /usr/sbin/inadyn
fileserver:~# tail -n 3 /var/log/syslog
Oct 20 18:29:21 fileserver INADYN[3275]: INADYN: Started 'INADYN version 1.96' - dynamic DNS updater.
Oct 20 18:29:22 fileserver INADYN[3275]: I:INADYN: IP address for alias 'flabby.is-a-geek.com' needs update to '65.93.163.244'
Oct 20 18:29:22 fileserver INADYN[3275]: I:INADYN: Alias 'flabby.is-a-geek.com' to IP '65.93.163.244' updated successful.

Then to make it permanent I did -

fileserver:# update-rc.d /etc/init.d/inadyn defaults
Adding system startup for /etc/init.d/inadyn...
/etc/rc0.d/K20inadyn -> ../init.d/inadyn
/etc/rc1.d/K20inadyn -> ../init.d/inadyn
/etc/rc6.d/K20inadyn -> ../init.d/inadyn
/etc/rc2.d/S20inadyn -> ../init.d/inadyn
/etc/rc3.d/S20inadyn -> ../init.d/inadyn
/etc/rc4.d/S20inadyn -> ../init.d/inadyn
/etc/rc5.d/S20inadyn -> ../init.d/inadyn

So it should run correctly on reboot now.