Remotely (re)starting my system via a smart power switch?

[Bo Berglund]

On Tue, 12 Jul 2022 23:50:43 +0200, Bo Berglund <bo.berglund at gmail.com> wrote:

>On Sat, 02 Jul 2022 11:19:06 +0200, Bo Berglund <bo.berglund at gmail.com> wrote:
>
>UPDATE:
>-------
>
>>On Thu, 30 Jun 2022 00:10:06 +0200, Bo Berglund <bo.berglund at gmail.com> wrote:
>>
>>Now back from the trip home and I can report that the real problem was *not*
>>overheating as I suspected (that has happened before).
>>Instead one of my 8-way NetGear Gigabit switches had given up so I had to rush
>>out and buy a replacement (TP-Link 8X Gigabit this time).
>>
>>Then the missing computers came on line again...
>>
>>But while I was there I checked the WOL setting in the laptop BIOS and it turns
>>out it is enabled already (but not named WOL of course).
>>So if an overheat shutdown happens in the future I will try the WOL trick.
>>
>
>Today one of my 2 laptops running Ubuntu suddenly shut down (I had a PuTTY
>session up and PuTTY gave an alarm sound when it lost connection).
>
>So now I could test the etherwake command to restart the laptop:
>
>IT WORKED!
>
>Took a bit longer than a normal reboot before it was on line but after a couple
>of minutes it was running again and responding to PuTTY!
>

Not a full solution yet!

3 days ago the same Ubuntu laptop disappeared from view, probably because of the
same overtemp shutdown or similar.
But this time it does not respond to an etherwake call, still off-line.

I will go back home tomorrow so I can check what is wrong with the device, this
time around....

I will then probably add a cron job to log the temperature of the CPU every
minute or so such that I can view it after the laptop has shut down.
(Logging to a network drive).

Is there a simple command I can use in the log script to remove lines older than
say an hour from the log file when I add a new entry?
Or keep only the last 60 lines or so in the file.


-- 
Bo Berglund
Developer in Sweden