I'm seeing an very odd and consistent 10 second time to negotiate a
websocket connection when using HAproxy, but only when I have more than
one server in the rotation.
Going directly to the server from the browser, I connect immediately.
With only one server in the haproxy backend, I connect immediately in
the browser.
When I have two servers in the backend haproxy makes connections to both
websocket backends and exactly 10 seconds after the client had
negotiated the connection to haproxy the client considers itself
connected to socket.io application. I added a stick-table based on src
thinking it might help which didn't change the behavior.
I tested in haproxy 1.4 (whatever the latest 12.04 LTS is shipping) and
the June 1st snapshot of 1.5. Same behavior in both cases. haproxy
server is a 64bit m1.small instance on EC2.
I suspect that there is something off if in my cobbled together config
from various blogs and serverfault answers. I can also get some proper
tcpdump later tonight too.
Ramin
# PUPPETHEADER: This file is owned by Puppet.
# vim:syntax=haproxy
#---------------------------------------------------------------------
# global settings, start
global
daemon
gid 0
maxconn 4000
pidfile /var/run/haproxy.pid
stats socket /var/lib/haproxy/stats
uid 0
ulimit-n 8192
log 127.0.0.1 local0 notice
# global settings, end
#---------------------------------------------------------------------
#---------------------------------------------------------------------
# default settings, start
defaults
mode http
log global
option httplog
option http-server-close
option dontlognull
option redispatch
option contstats
retries 3
backlog 10000
timeout client 25s
timeout connect 5s
timeout server 25s
# timeout tunnel available in ALOHA 5.5 or HAProxy 1.5-dev10 and higher
# timeout tunnel 3600s
timeout http-keep-alive 1s
timeout http-request 15s
timeout queue 30s
timeout tarpit 60s
default-server inter 3s rise 2 fall 3
option forwardfor
# default settings, end
#---------------------------------------------------------------------
#---------------------------------------------------------------------
# frontend settings, start of ws
frontend ws
bind *:80
default_backend ws
# frontend settings, end of ws
#---------------------------------------------------------------------
#---------------------------------------------------------------------
# backend settings, start of ws
backend ws
balance roundrobin
stick store-request src
stick-table type ip size 200k expire 20m
server fe01 fe01.stage.usw2.example.com:8000 maxconn 1000 check
server fe03 fe03.stage.usw2.example.com:8000 maxconn 1000 check
# backend settings, end of ws
#---------------------------------------------------------------------
