webpage check and load balancer weirdness

[Neil]

Hi Marc, 

So there's nothing we can do on our side? 

Thanks. 

Marc Powell writes: 

> Neil <mailto:neil-on-nagios at restricted.dyndns.org> wrote:
>> Hey guys, 
>> 
>> Just wondering about the alert I got this morning. I have 8
>> webservers behind 1 load balancer. One webserver was providing HTTP
>> internal error 500.  
>> I got the alert for that and is correct. But I also have another
>> check that checks the webpages on the load balancer. I was wondering
>> why nagios is also seeing the HTTP 500 error but Internet Explorer
>> gets the proper web pages from the remaining 7 webservers. Any ideas?
> 
> Depending on the configuration and capabilities of your LB, it may be
> using a hash to determine what web server you get sent to. Alteon AD3's
> do this if your metric is hash. Session persistence is another method.
> Your first request get's sent to the least utilized web server and all
> subsequent requests from you get sent to the same device. If your
> monitoring machine was directed to the bad box on a request then using
> either method would redirect you to the same box on subsequent requests.
> You should consult your load balancer's manual and configuration for
> specifics. 
> 
> --
> Marc
 


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