UPS Guides for (Linux) Servers

There is a software for Linux called NUT https://networkupstools.org/https://networkupstools.org/. It works with quite a few UPS brands and models... Maybe you can get it going for your needs.

Look at ApC support download for powerchute which is their app..
1000VA USB cable is through .....

Check the server settings for behavior on restore of power.

If the power supply fails, the ups was not the cause.

@Scott Silva

Proceed as per the given comments from Scott/...

After reading your query I was thinking one more way (how ever it requires 3 systems => 1 windows an 2 Linux)

@ 1 windows system using batch file or cygwin:
obtain the value of BATTERY_PERCENTAGE_AVAILABLE using
C:\Windows\System32\wbem\wmic.exe Path Win32_Battery Get EstimatedChargeRemaining
Assume that the usage is:
EstimatedChargeRemaining
20

When this value is 20 send a signal to running application (example signal/sigaction using C/C++) which is waiting for signal at Linux system
Once receiving that signal make required action at Linux.


Just thought of sharing information which I am following from 2012
my personal HP laptop power battery has gone.
It made me to spend 4500.00 to buy new power battery.
Due to that started following using cygwin at windows:

%USERPROFILE%\AppData\Roaming\Microsoft\Windows\STARTM~1\Programs\Startup\LaptopBattery.vbs
LaptopBattery.vbs
invoking LaptopBattery.sh
LaptopBattery.sh using
/cygdrive/c/Windows/System32/wbem/WMIC.exe Path Win32_Battery Get EstimatedChargeRemaining
Assign that output to a variable
if the value of that variable is letss than or equal to 20 open
/cygdrive/c/Windows/system32/taskmgr.exe
OR
/cygdrive/c/PROGRA~2/Intern~1/iexplore.exe

Use taskmgr.exe if opening taskmgr.exe not having administration privileges.

After 2012 I never faced this issue yet.
Also started following this vbs .sh file in 2 personal laptops.

you can following same way and replace taskmgr.exe => otherapp.exe or script / batch at windows to send related signal to Linux.
Either signal to Linux
or
logon to Linux using ssh.exe (automation login ) at windows => to Linux and create a file at Linux system required directory.
At Linux system execute a script in a loop.
If a file being created, handle required action at Linux related to power/server/...

Let me know your comment if any ?

@Scott Silva

a)
Content of LaptopBattery.sh => We can change .sh to required .bat or .cmd also

#!/bin/bash
while [ 1 ]
do
        BATTERY_PERCENTAGE_AVAILABLE=$(/cygdrive/c/Windows/System32/wbem/WMIC.exe Path Win32_Battery Get EstimatedChargeRemaining |\
        /bin/grep -E "[0-9]" |\
        /usr/bin/tr -d "\r")
        if [ $BATTERY_PERCENTAGE_AVAILABLE -le 20 ]
        then
                /cygdrive/c/Windows/system32/taskmgr.exe >/dev/null 2>&1 &
        elif [ $BATTERY_PERCENTAGE_AVAILABLE -ge 98 ]
        then
                /cygdrive/c/Windows/system32/taskmgr.exe >/dev/null 2>&1 &
        fi
        /bin/sleep.exe 300
done

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b)
Content of LaptopBattery.vbs

Set WshShell = CreateObject("WScript.Shell" )
WshShell.Run chr(34) & "FullPath\LaptopBattery.CMD" & Chr(34), 0
Set WshShell = Nothing

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c)
content of LaptopBattery.CMD
either using .sh file
or .CMD file (contents of batch file)

@ECHO OFF
START /B Drive:\cygwin\bin\bash.exe "FULLPATH\LaptopBattery.sh"

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@MURUGESAN: laptop? laptopbattery? Windows? (you are the one that mentions it...?).....
This is about a linux server connected to a UPS... (which is quite a different setup).

Querying UPS's is quite something different. (if possible) some only indicate through the "modem control" lines in a serial cable:
on-line (aka power available) / off-line (no power available)   using fe. Carrier Detect signal
Battery sufficient / insufficient f.e. using CTS/RTS signals.
Those lines can be used to trigger interrupts to cause faster response in systems.  And could be used to trigger at a preset level so the system knew before the fatal point when to start shutdown.   On some models the actual power/ battery levels / read/write triggerpoint could be done using send/rcve wires.

Hey Scot, thanks for the recommendation. Seems good, I was only familiar with Apcupsd.

I will test the app.

@Arnold - I found the PowerChute software only works in a windows environment.

@Noci - turn off other server via SSH is a great idea. And even the PDU.

@ MURUGESAN, thanks for the scripts. Made me aware of another possibility.

@Gilberto Sanches

>> thanks for the scripts.
Most welcome.
I can understand your/noci comments.
I am not writing following comment to get points?

Need to know comments on any assisted solution or knowledge transfer ?

Hi experts, how would the script look like for the master server to turn off the slave(s) computers via SSH ?

A script that only shuts down it's slaved based on the UPS trigger.
So manually turning off the master server shouldn't automatically turn of the slave(s) servers.

Like below:

#!/bin/bash
ssh shutdownuser@remotehost shutdown -h now

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This assumes:
* there is anetwork path between the master & slaves
* you setup certificate logon from the UPS account to the remote shutdownuser account.
* On the remote host you make sure the shutdownuser account is allowed to start the shutdown command.

The above script needs to be setup in the ups shutdown actions.  so mention it in the upsmon config as part of the SHUTDOWNCMD setting.

With the NUT upsd you can also listen for another system to issue a signal.

Thank you very much Noci