Robert Heller wrote:
> At Fri, 1 Jul 2011 12:26:10 +0100 (BST) CentOS mailing list <centos@xxxxxxxxxx> wrote:
>
>> On Fri, 1 Jul 2011, Timothy Murphy wrote:
>>
>>> I have a CentOS-5.6 remote server in a house in Italy,
>>> where there are occasional thunder-storms.
>>>
>>> There was one yesterday, when the electricity
>>> went off 3 times, for a second or so on each occasion.
>> <snip>
>>
>> Just buy a really basic UPS. I don't know what the prices are like where you
>> are, but a crappy 500VA UPS can be had for about 25 uk pounds.
>>
>> I've only ever monitored APC UPSs which can be monitored easily from linux, so
>> check for linux compatibility before buying something obscure.
>
> With a non-Linux compatable UPS, you can use a old analog serial modem
> as a power sensor. If the machine has a serial port (RS-232), you can
> plug the modem into the wall outlet and connect it to the computer's
> serial port. When the power goes out, the modem goes off and powerd can
> sense the loss of Modem Ready and treat that as a 'power failure'
> signal. This trick works for cheap, obscure or basic *dumb* UPSs.
>
>> jh
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>>
>
Another solution could be cheap router with IP not pluged into UPS. If
server can not ping that IP, you would shut it down, via script.
Ljubomir
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