Greetings, We recently deployed HAProxy in a virtualized environment. I am having some problems with occasional socket accept errors. We are seeing the problems primarily on the pure TCP load balancing portion of our configuration. The load balancer is running in the Rackspace Cloud under Xen. Basically what I am seeing is that sockets never get nailed up, even though I am 110% sure all the back-end servers are operating fine. We have secondary monitoring processes which are constantly setting up and tearing down sockets directly (bypassing HAProxy) to ensure that the servers are up and running. I have provided our config and some other information below. If anyone can point me in the right direction for figuring out this issue, i would greatly appreciate it.
Thanks! uname -a Linux globallb1 2.6.18-164.el5xen #1 SMP Thu Sep 3 04:41:04 EDT 2009 x86_64 x86_64 x86_64 GNU/Linux HA-Proxy version 1.4.2 2010/03/17 Copyright 2000-2010 Willy Tarreau <[email protected]> Build options : TARGET = linux26 CPU = generic CC = gcc CFLAGS = -O2 -g OPTIONS = USE_REGPARM=1 USE_PCRE=1 USE_STATIC_PCRE=1 Default settings : maxconn = 2000, bufsize = 16384, maxrewrite = 8192, maxpollevents = 200 Encrypted password support via crypt(3): yes Available polling systems : sepoll : pref=400, test result OK epoll : pref=300, test result OK poll : pref=200, test result OK select : pref=150, test result OK Total: 4 (4 usable), will use sepoll. /etc/haproxy.cfg global maxconn 4096 # Total Max Connections. This is dependent on ulimit daemon nbproc 4 # Number of processing cores. Dual Dual-core Opteron is 4 cores for example. log 127.0.0.1 local0 debug defaults mode http clitimeout 300000 srvtimeout 300000 contimeout 4000 log global #option tcplog #option httplog #option httpclose # Disable Keepalive listen http_proxy 100.200.300.131:80 mode http balance roundrobin # Load Balancing algorithm option httpchk option httpclose ## Define your servers to balance server rs-webserver1 100.200.300.217:80 server rs-webserver2 100.200.300.216:80 server rs-webserver3 100.200.300.136:80 server rs-webserver4 100.200.300.220:80 server rs-webserver5 100.200.300.126:80 listen services 100.200.300.131:1312 mode tcp balance roundrobin # Load Balancing algorithm option tcpka retries 3 ## Define your servers to balance server rs-webserver1 100.200.300.217:1312 server rs-webserver2 100.200.300.216:1312 server rs-webserver3 100.200.300.136:1312 server rs-webserver4 100.200.300.220:1312 server rs-webserver5 100.200.300.126:1312 listen stats :8080 mode http stats uri /
