Re: [monit] restart service if swap or real ram is below a thresgold

[Martin Pala]

Monit monitors just the physical memory usage (no swap).

When the system starts to swap heavily, it is bad for performance no  
matter how much swap you have. If you know that the memory shortage  
on you system can be solved by restarting one process, then you  
should probably check this particular process' memory usage, since  
there will be most probably relationship. If you are sure that the  
system wide check is the right solution, the you can use something  
like this:

--8<--
 check system myhost
    if memory usage > 95% then exec "/bin/pkill badguy"
--8<--

Or if the badguy is monitored by monit, then:

--8<--
 check system myhost
    if memory usage > 95% then exec "/bin/bash -c '/usr/bin/monit  
restart badguy'"

 check process badguy ...
  start ...
  stop ...
--8<--


Martin


On Nov 17, 2007, at 9:28 PM, David Campbell wrote:

> Martin Pala wrote:
> > I think this question is too general.
>
> Sorry, I didn't think it was.
>
> I want to restart a daemon when swap gets below 250Mb.
>
> > See monit manual for "check system ..." statement, which allows to  
> > monitor total system resources, including memory.
>
> I saw this but I couldn't see how to tie in the check system with  
> restarting a service.
>
> Dave
>
>
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