backends, ACLs and persistence

From: Jeremy <>
Date: Mon, 27 Apr 2009 17:11:53 -0500

I'm trying to set up HAProxy to send all .php pages to a linux server, and all .aspx pages to a Windows server, for a single website. I've been trying this with Pound, nginx, etc just to try and chose a new load balancer software to go with. So far I'm really impressed with the depth of HAProxy's configuration options, and the httpchk health check is very cool compared to just a dumb connection check which Pound and Nginx are stuck with, but I'm having trouble figuring something out.

With the config below if I go to /test.php it sends it to the Linux server just fine. If I wait a while and go to /test.aspx it sends it to the Windows server just fine. But if I try both of them back to back, some sort of persistence is messing up the 2nd request... i.e. I go to /test.php and hit the Linux box, then if I go to /test.aspx immediately it still sends me to the Linux box instead of the Windows one.

I tried commenting out the defaults option persist and redispatch but that didn't help, maybe I need to do no persist / no redispatch I guess? I tried using separate cookie names instead of just using SERVERID in all the backends but that didn't really help.

The thing is I don't want to disable persistence completely, i.e. if this setup had 10 backend windows servers and 10 linux servers, I'd like each backend section to keep track of its own persistence separately... So if you hit /test.php and /test.aspx back to back repeatedly you'd keep going to the same Linux and Windows server.

I tried setting up the 'stats' option as well and it had similar issues. If I set up a stats backend, and hit /stats right off the bat they'd show up ok, but as soon as I went to another test page and got sent to a linux or windows server the /stats page would then break.

Thanks, and my apologies if this has been asked a million times!


        log   local0
        log   local1 notice
        maxconn 4096
        chroot /usr/share/haproxy
        user nobody
        group nobody

defaults log global mode http option httplog option dontlognull option persist option redispatch retries 3 maxconn 2000 contimeout 5000 clitimeout 50000 srvtimeout 50000 backend Site01-windows mode http balance leastconn cookie WINID insert indirect option httpchk HEAD /index.html HTTP/1.0 server TestWin01 cookie Win01 check fall 2 backend Site01-linux mode http balance leastconn cookie LINID insert indirect option httpchk HEAD /index.html HTTP/1.0 server TestLin01 cookie Lin01 check fall 2 backend Site01-both mode http balance roundrobin cookie SRVID insert indirect option httpchk HEAD /index.html HTTP/1.0 server TestWin01 check fall 2 server TestLin01 check fall 2 listen Site1HTTP mode http acl url_aspx path_end .aspx .asp .asmx acl url_php path_end .php .phps use_backend Site01-windows if url_aspx use_backend Site01-linux if url_php default_backend Site01-both
Received on 2009/04/28 00:11

This archive was generated by hypermail 2.2.0 : 2009/04/28 00:15 CEST