socket.io load balancing with HAProxy on Docker

Load Balancing with HAProxy on Docker

Setup

HAProxy + Socket.io + Node

 

HAProxy Config 

haproxy.cfg

global
  maxconn 4096
 
defaults
  mode http
  balance roundrobin
  option redispatch
  option forwardfor
  timeout connect 5s
  timeout queue 5s
  timeout client 50s
  timeout server 50s
 
listen stats
  bind  *:1936
  mode  http
  stats enable
  stats uri /stats
  stats auth guest:guest
  stats refresh 5s
 
frontend http-in
  bind *:8000
 
  # check request ws acl 
  acl backend_ws path_beg /socket.io
  acl backend_ws hdr(Upgrade) -i webSocket
  acl backend_ws hdr_beg(Host) -i ws
 
  # if it is ws request , use websockets 
  use_backend websockets if is_websocket
  # if it is http request, use webservers
  default_backend servers 
 
backend servers # web server
  server server1 [address]:[port] check
  #example
  #server server1 172.17.0.10:8080 check
 
backend websockets # socket server
  balance source # if use balance to roundrobin, you have to use stick option 
  option http-server-close
  option forceclose
  server ws-server1 [address]:[port] maxconn 30000 weight 1 maxconn 1024 check
  
  #example
  #server ws-server1 172.17.0.1:80 maxconn 30000 weight 1 maxconn 1024 check
  #server ws-server2 172.17.0.2:80 maxconn 30000 weight 1 maxconn 1024 check
  #server ws-server3 172.17.0.3:80 maxconn 30000 weight 1 maxconn 1024 check