Varnish w/hardware loadbalancing woes

[Copper, Candace L]

Michael, had the ARP disabled on the VIP and then the site wouldn't load at all with the VIP and still saw the Unable to connect errors. We re-enabled ARP and then our site still wouldn't load, and we couldn't kill any httpd processes and had to reboot. 

Just weird stuff happened with that.

Candace Copper 


-----Original Message-----
From: varnish-misc-bounces at varnish-cache.org [mailto:varnish-misc-bounces at varnish-cache.org] On Behalf Of Michael Loftis
Sent: Thursday, September 23, 2010 10:57 AM
To: 'varnish-misc at varnish-cache.org'
Subject: Re: Varnish w/hardware loadbalancing woes

Sounds more like a load balancer setup problem than a varnish issue.  Under 
Linux atleast with DR setups you must disable ARP for the VIP, unless 
you're using a tunnel setup or a setup where your VIPs are completely 
separate VLAN/LAN.

It sounds like this is what's happening, that the real servers are 
receiving the traffic sometimes and the load balancer at others because of 
the ARP issue.

--On Thursday, September 23, 2010 9:21 AM -0700 "Copper, Candace L" 
<Candace.Copper at goAAA.com> wrote:

>
>
> I've looked all over for information on how to configure varnish to use
> a VIP and have not been able to find much – so I'm hoping someone
> here can assist.
>
>
>
> Our setup goes like this: Hardware Loadbalancer (sticky sessions enabled)
> with one VIP(perf-drupal.domain.com) directs to three Apache identical
> webservers (each running Varnish – (perf-drupal1.domain.com,
> perf-drupal2.domain.com & perf-drupal3.domain.com)). With the VCL that we
> currently have, it works like a charm on each individual server, but when
> we try to use the VIP we get errors (50% of the time) when trying to
> access the site, stating that it is not available.
>
>
>
> I've tried:
>
>
>
> backend newsite {
>
>     .host = "localhost";
>
>     .port = "8080";
>
> }
>
> set req.http.host = "perf-drupal.domain.com";
>
> set req.backend = newsite;
>
>
>
> and using the default backend:
>
>
>
> backend default {
>
>   .host = "127.0.0.1";
>
>   .port = "8080";
>
> }
>
>
>
> I've read about the DNS Director, but that's not available in the
> version I have installed - 2.1.3. But since we are only running one site,
> I don't know if it will help. I don't have access to any additional
> hardware, so I cannot split out Varnish from the Apache web server.
>
>
>
> Any assistance would be greatly appreciated!  J
>
>
>
> Candace Copper
>
>
>





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