I need to generate a SMS / Email alert when the server´s UPS is finishing its charge. We have a car battery connected to the motherboard that works as a UPS (http://www.mini-box.com/M2-ATX-160w-Intelligent-Automotive-DC-DC-Power-Supply) When this device detects that battery is lowering the voltage, its send an ON pulse to the motherboard. Somehow Ubuntu (i´m using version 11) detects this pulse and shows a screen telling that in 60 seconds ubuntu will shutdown. I need to execute a script to call a webservice to notify this situation. How can I trap that alert? I have also tried also using a script in rc0.d but it is not calling my WS (seems that network is down before it is executed). How can I alternatively execute something in runlevel 0 before network is down?
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There is maybe a cleaner way to achieve this, however the following works on my Ubuntu 12.04 (sorry, don't have 11 under hands).
Under /etc/rc0.d
you should find a file named S35networking
which is in fact a link to /etc/init.d/networking
.
In this file locate the stop)
for the case
statement and add your command line/script here, at first line. It will be executed before the NIC goes down.
e.g :
case "$1" in
start)
....
;;
stop)
send_sms_email
...
;;
....
esac
To summarize, i just suggest to modify the system init.d
networking script to add your command on stop
event.
It will work, but once again it is maybe not the cleanest way...it is a way...
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krisFR
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