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Re: Is monit deterministic?

From: Lutz Mader
Subject: Re: Is monit deterministic?
Date: Fri, 23 Dec 2022 00:33:41 +0100
User-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.10; rv:60.0) Gecko/20100101 Thunderbird/60.4.0

Hello Leonard Teng,
from my point of view monit is not the problem sometimes.

> I just wanted to inquire on whether monit is guaranteed to perform service
> restarts in high CPU/RAM usage situations? 

>From the monit point of view, monit can handle low free RAM or RAM
shortage, but restarts can not handle sometimes. I find "out of memory"
conditions on Linux and AIX systems with a RAM shortage all the time
monit try to start a command to try a restart or anything else.

> Wanted to know if I need to be
> conservative in setting thresholds for CPU/RAM usage for services.

You should use conservative thresholds.

But it depence to your systems,

On AIX systems I use cpu and memory threadholds up to 95%.

check system $HOST
  every 5 cycles
  if cpu usage > 95% for 10 cycles then alert
  if memory usage > 95% for 20 cycles then alert
  if swap usage > 50% for 20 cycles then alert
  if swap usage > 30% for 5 cycles then exec
"/usr/local/etc/monit/scripts/ 500"
     repeat every 20 cycles

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