BSD monitoring

Usul

Usul

I run FreeBSD 13 on a VM and occasionally CPU maxes out and never goes back to something useful. This started after my upgrade to 13.2 from 13.1. I know that CPU maxes out from my VM provider. When cpu is high, I can't ssh to the box and figure out what is causing the issue. Eg I'm completely in the dark wrt what is causing the CPU spikes.
I thought about installing bsdsar but that's not available anymore, what are my option to
- have something that looks regularly at what is consuming cpu and records that on disk
- let's me see said data after a reboot (whihc is my current solution).

Ludo
 
As a light solution I am aware of top but I don't think you can use it in a script, otherwise it's the big tools like those in the following link:
forums.freebsd.org

Solved - Complete server monitoring tool

Hello folks, I'm currently looking for a solution to monitor my FreeBSD servers/hosts. I'd like to have a utility that allows me to monitor multiple FreeBSD hosts remotely (eg. via a web interface). I've searched the interwebs and it appears that there are plenty of utilities available for...
forums.freebsd.org forums.freebsd.org
 
Just use cron
Run every few minutes and save somewhere the output of required tools (top, gstat, netstat, etc.).

Example:
Code: 
top -n > /tmp/top-`date "+%Y%m%d-%H%M"`

You will have a chance to review a lot of text files with all required info.
 
Usul said:
I know that CPU maxes out from my VM provider.
Click to expand...
Are in those logs timestamps recorded, if yes, check out if this high CPU usages take place at the same time (assuming the high usages is temporary)?

Could be something from /etc/periodic/daily/.

Usul said:
When cpu is high, I can't ssh to the box and figure out what is causing the issue.
Click to expand...
Do you mean the system is totally frozen or just sluggish? If the system is frozen, and the file system can't be accessed to write on, that would make logging not very likely.

Does the high CPU usage dissipate in time or does it stay indefinitely?
Usul said:
I thought about installing bsdsar but that's not available anymore, what are my option to
- have something that looks regularly at what is consuming cpu and records that on disk
Click to expand...
You could create an crontab(5) to run top(1) in "batch" mode (-b , also, besides other options, -q could be of use) at certain intervals and redirect (append) the output to a log file.


How is the VM configured, RAM, number of CPU's,
 
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