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Quandary
Asked: 2010-11-14 10:26:35 +0800 CST

Send notification after powerloss resume?

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Question:

I've set the BIOS of my server to automagically resume the last state (running/switched off) after a powerloss.

Now, how can I send myself an E-Mail when the system has resumed after a powerloss ?

I know it is possible, since my Synology Diskstation can do it (which is how I got the idea in the first place). Sadly I'm not able to reverse-engineer how it does it.

linux power-supply-unit electrical-power

3 Answers

  1. Best Answer

    Add an RC script or equivalent. Have it touch a file on normal shutdown. On startup, have it check for the file, and send an email if the file is not there. E.g:

    #!/bin/bash

SHUTDOWNFILE=/etc/normalshutdown

if [ ${1} = "stop" ] then touch "${SHUTDOWNFILE}"
elif [ ${1} = "start" ] 
then 
    if [ ! -e "${SHUTDOWNFILE}" ] 
    then 
        mail -s "Power failure, recovered" [email protected]
    else
        rm "${SHUTDOWNFILE}"
    fi
fi

    (You'll probably have to debug it, and pay attention to security to avoid accidentally giving users access to create files to conflict with this one)

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  2. Just add something like this to /etc/rc.local:

    echo "Subject: `/bin/hostname` has booted @ `date '+%Y/%m/%d %H:%M:%S'`"|/usr/lib/sendmail -i [email protected]

    This will email every time it boots, not just after power loss. More logic will be required if you only want emails following power loss. Personally, I like to know whenever one of my servers reboot - especially if it wasn't an intentional reboot.

    • 0

  3. You need an Internal IPMI on the system hardware ( which can report failures of powerloss and hardware failure via email)

    Secondly and i think most importantly.. and external system which checks health of systems..

    Nagios & Cacti both offer these functions..
    Cacti actually being the simpler of the two ( Nagios can be quite complicated to maintain ) Using SNMP or simple pings.. ( can also be other services )

    Basically the tool allows you to poll every ( determined ) minutes.. for a response.. After (determined) failures, it sends you an email..

    This is a typical systems administrators set of tools for notifications.. :D

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