[Ddclient-forum] [ddclient - Developers] Running ddclient from inittab

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By: fest3er

Some years ago, I had trouble keeping ddclient running reliably. IIRC, ddclient
would 'hang' and stop updating the dyndns service. As a workaround, I wrote
the following shell script to be run via init(1). The basic idea is that init(1)
runs the script. The script runs ddclient, then sleeps for some minutes, to
give ddclient enough time to do its job. Then, regardless of the update's success,
ddclient is killed. When the script exits, init(1) restarts it.

I did this because ddclient, as a daemon, was hanging and not updating the DNS
entry. Ameritech's DSL system changes the IP address almost as often as humans
blink. Because I needed reliable remote access to the target system, I decided
to use init(1) to be sure that ddclient ran regularly. Since then, ddclient
has been more stable than bedrock (plate tectonics, you see...).

Five years now and it's been running without a hitch. So, in case this option
might be of use to the project or to others, here's the inittab entry and the
shell script:

inittab entry:
DD:23:respawn:/etc/ddclient.sh

shell script:
#! /bin/sh

# 4/10/02 Neal P. Murphy
# Donated to the ddclient project, 8/15/07
# ddclient shell script to run from init(1)
# run once, sleep 300 seconds and exit, letting init(1)
# restart it.


# Run ddclient in background and save PID
/usr/sbin/ddclient -pid "/var/run/ddclient.pid"&
PID=$!

# Give ddclient 5 minutes to do its magic, then murder it
sleep 300
kill -9 $PID `cat /var/run/ddclient.pid 2>/dev/null` >/dev/null 2>&1
rm -f /var/run/ddclient.pid >/dev/null 2>&1

# Now exit, and let init restart it
exit 0


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