VM with Debian, reboots randomly..

[George Michalopoulos]

hello all,
i have several proxmox servers, in a specific one, i run a Debian 11 VM.
this VM reboots randomly..

reboot   system boot  5.10.0-19-amd64  Tue Oct 25 00:24   still running
reboot   system boot  5.10.0-19-amd64  Mon Oct 24 22:08 - 00:23  (02:15)
reboot   system boot  5.10.0-19-amd64  Mon Oct 24 18:58 - 22:07  (03:08)
reboot   system boot  5.10.0-19-amd64  Mon Oct 24 05:17 - 18:57  (13:39)
reboot   system boot  5.10.0-19-amd64  Sun Oct 23 21:30 - 05:16  (07:46)
reboot   system boot  5.10.0-19-amd64  Sun Oct 23 10:51 - 21:29  (10:38)
reboot   system boot  5.10.0-19-amd64  Sun Oct 23 05:59 - 10:50  (04:51)
reboot   system boot  5.10.0-19-amd64  Sat Oct 22 23:29 - 05:58  (06:28)
reboot   system boot  5.10.0-19-amd64  Sat Oct 22 16:54 - 23:28  (06:34)
reboot   system boot  5.10.0-19-amd64  Sat Oct 22 03:31 - 16:53  (13:21)
reboot   system boot  5.10.0-19-amd64  Sat Oct 22 02:19 - 03:30  (01:11)
reboot   system boot  5.10.0-19-amd64  Fri Oct 21 23:34 - 02:18  (02:43)
reboot   system boot  5.10.0-19-amd64  Fri Oct 21 20:30 - 23:33  (03:03)
reboot   system boot  5.10.0-19-amd64  Fri Oct 21 09:45 - 20:29  (10:43)
reboot   system boot  5.10.0-19-amd64  Thu Oct 20 22:52 - 09:44  (10:52)
reboot   system boot  5.10.0-19-amd64  Thu Oct 20 15:24 - 22:51  (07:27)
reboot   system boot  5.10.0-19-amd64  Thu Oct 20 10:12 - 15:23  (05:10)
reboot   system boot  5.10.0-19-amd64  Thu Oct 20 08:49 - 10:11  (01:21)
reboot   system boot  5.10.0-19-amd64  Thu Oct 20 08:31 - 08:49  (00:17)

i dont know how and where to start searching, any clue ?

 

[shanreich]

Can you provide the syslog for the time ranges in question for the VM? (located under /var/log/syslog)

 

[George Michalopoulos]

i finally found that it was trying to renew letsencrypt certificates, there was a false host name in apache conf and after failure, it was rebooting..
it had certbot installed both with apt and snap.
removed all, installed through snap and now its not rebooting.
thanks for pointing me to syslog.

 

[arxaios]

You are lucky it doesn't freeze your machine entirely ...like mine.!