[SOLVED] Proxmox crashes at boot (or reboots) with no reason

[stewie3112]

hi everyone, this evening I took off my Proxmox server to install an additional fan. once plugged back it started the boot process as usual and after 1 minute it was off again.
Connected ipmi remote screen and nothing seems strange, it just shuts down suddenly after the line "reading all physical volumes. this may take a while". Attached is a screen here (only once) it displayed 2 additional lines.

the storage is configured in zfs mirror with the standard settings

Desperately looking for help

 

[stewie3112]

update: trying to boot directly from one of the ssd I get some output. I can't see any error message, but while everything is starting up, suddenly all services begin to stop like if something is regularly triggering a system shutdown

I recently installed nut-client on the host, could this be a wrong configuration? Attached a snapshot of the moment when the services begin to shut off.

 

[apoc]

I recently installed nut-client on the host, could this be a wrong configuration? Attached a snapshot of the moment when the services begin to shut off.

Indeed it could.
I have had such a scenario with APCUPSD once. Selected the wrong cable (serial) type and the UPS sent an emergency-shutdown right away.
Boom. 70 TB data degraded. Hack that was a shock.
try booting into single-user mode / rescue shell and disable the service.

 

[stewie3112]

Indeed it could.
I have had such a scenario with APCUPSD once. Selected the wrong cable (serial) type and the UPS sent an emergency-shutdown right away.
Boom. 70 TB data degraded. Hack that was a shock.
try booting into single-user mode / rescue shell and disable the service.

thanks, I'm trying to find the right way to boot in single user / rescue without success, can you explain?

edit: found how to boot in single user mode, disabled that damn service and everything is back up running fine!!
any idea why th knut monitor service was sending the shutdown signal right at boot?

 

[apoc]

Usually you can open the grub menu on boot and get advanced features.
There is an option included to run into single user or rescue mode.
If that does not work: try boot from a live iso, mount the disk and correct your issue or even remove/rename the config file

 

[stewie3112]

Thanks everyone, I finally managed to understand why the system kept rebooting and discovered that the cause was the nut server itself, running on a Synology box.
Incredibly during the time the server was plugged off, I had a shortage at home and the ups went (and stayed) in FSD mode. This way, every time during boot the client correctly sent the shutdown signal!