Hi, Stupid guestion: Are you sure that the backed is healthy from the LB's point of view when this 503 appears? I mean if the LB is struggling with the probe sometimes...
You could also try to change to lb-director in loadbalancer to something else (I guess you are using RR) and ensure that you have no stickyness in this backend farm configured. -hjp ________________________________________ From: [email protected] [[email protected]] On Behalf Of Bryan Stillwell [[email protected]] Sent: 31 October 2011 5:40 To: [email protected] Subject: Re: Sporadic 503 errors with 3.0.2 On Fri, Oct 28, 2011 at 12:41 AM, Tollef Fog Heen <[email protected]> wrote: > ]] Bryan Stillwell > > | It looks like backend_fail numbers line up with what I'm seeing. Any > | suggestions on figuring out what is failing? > > My first guess would be you hitting connect_timeout, try increasing that > and see if the rate changes? Thanks for the response, but unfortunately that setting didn't have any noticeable effect on the number of backend failures. However, it did get me re-evaluating whether or not the problem actually existed between varnish and the web servers. Out of the switches, networking cables, and load balancers, I decided to try removing the load balancers today (since I was planning on doing that anyways). Once I did, the number of backend failures and 503 responses dropped to zero! :-) Bryan _______________________________________________ varnish-misc mailing list [email protected] https://www.varnish-cache.org/lists/mailman/listinfo/varnish-misc _______________________________________________ varnish-misc mailing list [email protected] https://www.varnish-cache.org/lists/mailman/listinfo/varnish-misc
