When to HUP and when to restart?

[Morris, Patrick]

Jim Avery wrote:
> 2009/12/24 Jonathan Call <jcall at verio.net>:
>   
>> If you’re using the embedded Perl interpreter a restart is probably better since the interpreter leaks memory.
>>
>> If you have a very large solution (thousands of service checks) a restart will take a considerable amount of time so a HUP would probably be wise in that situation.
>>     
>
>
> Thank you - it will make a huge difference not to have to restart once
> or twice a day.  Thanks to 6000 or so service checks and the NDO
> back-end a restart takes a minute or two.
>   

It should probably be noted that even a reload can take a while if 
you've got NDO on the back end, because it still needs to do all the 
database voodoo that happens when you restart.  The upside to a SIGHUP, 
though, is that Nagios just stops doing anything during that period, but 
won't throw an error page like it does on a full restart.

FWIW, we use embedded Perl here and thousands of service checks, and 
rarely, if ever, need to issue a full restart.

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