webpage check and load balancer weirdness
Marc Powell
marc at ena.com
Wed Jun 30 22:55:44 CEST 2004
Neil <mailto:neil-on-nagios at restricted.dyndns.org> wrote:
> Hi Marc,
>
> So there's nothing we can do on our side?
Sure, investigate the configuration on your load balancing device and
change the load balancing method if you find it lacking.
--
Marc
>
> 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
-------------------------------------------------------
This SF.Net email sponsored by Black Hat Briefings & Training.
Attend Black Hat Briefings & Training, Las Vegas July 24-29 -
digital self defense, top technical experts, no vendor pitches,
unmatched networking opportunities. Visit www.blackhat.com
_______________________________________________
Nagios-users mailing list
Nagios-users at lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/nagios-users
::: Please include Nagios version, plugin version (-v) and OS when reporting any issue.
::: Messages without supporting info will risk being sent to /dev/null
More information about the Users
mailing list