Sample HA Proxy Config for Tornado/Socket.io Backends

sample.config

global
    maxconn     10000 # Total Max Connections. This is dependent on ulimit
    nbproc      2

defaults
    mode        http
    option      redispatch
    maxconn     2000
    contimeout  5000
    clitimeout  50000
    srvtimeout  50000
    option      httpclose

frontend all 0.0.0.0:80
    timeout client 86400000
    acl is_websocket hdr(Upgrade) -i WebSocket
    acl is_websocket hdr_beg(Host) -i ws 

    use_backend socket_backend if is_websocket # Filter for Websockets
    default_backend www_backend

backend www_backend
    balance roundrobin
    cookie SERVERID insert indirect # Match requests to same machines, if possible
    option forwardfor # This sets X-Forwarded-For
    timeout server 30000
    timeout connect 4000
    server server1 localhost:8001 weight 1 maxconn 5000 cookie FE1 check 
    server server2 localhost:8002 weight 1 maxconn 5000 cookie FE2 check

backend socket_backend
    balance roundrobin
    cookie SOCKETID insert indirect # Match socket requests to same machines, if possible
    option forwardfor # This sets X-Forwarded-For
    no option httpclose # To match the `Connection` header for the websocket protocol rev. 76
    option http-server-close
    option http-pretend-keepalive
    timeout queue 5000
    timeout server 86400000
    timeout connect 86400000
    server server1 localhost:8001 weight 1 maxconn 5000 cookie SCKT1 check
    server server2 localhost:8002 weight 1 maxconn 5000 cookie SCKT2 check