Hi Duncan, On Wed, Sep 16, 2009 at 10:15:55PM +1000, Duncan wrote: > Hi All, > > Our load testing is bringing up intermittent 503 errors after about 15 > minutes of testing. It could be an issue with our application but I > thought I'd post a copy of my config in the hope that somebody could run > an eye over it as a bit of a sanity check. We are running on Linux > CentOS 5.3 using the stock CentOS 2.6.18-164.el5 kernel and haproxy 1.3.20 > > Any suggestions? Thanks in advance.
Do you see the servers go down on the stats page ? If so, it could mean that your health-checks are not tolerant enough and that you should increase their interval (or timeout) to grant the servers more time to respond. If you don't see the servers go down, it is possible that from time to time your machine is running out of source ports, or that it cannot connect outside due to a conntrack table full (check dmesg). Also, take a look at the logs which report a 503. The session termination flags will be of great help. For instance, it's possible that a server's queue is filling and that sessions are expired from it after the connect timeout, eventhough it's not very likely in your case due to your already large timeout. You should use "timeout queue" for the queue BTW. Hoping this helps, Willy
