haproxy 1.5 config (lockup)

global
   ulimit-n 655570
   group haproxy
   user haproxy
   log 127.0.0.1 local1 emerg info
   maxconn 32768
   daemon
   nbproc 4

defaults
    mode http
    backlog 100000
    log global
    timeout client 10s
    timeout server 10s
    timeout queue  10s
    timeout connect 5s
    timeout http-request 5s
    option abortonclose

frontend frontend_http
    mode http
    bind 2.1.1.1:80
    default_backend backend_http
    maxconn 32768
    rate-limit sessions 100000
    option forwardfor

backend backend_http
    balance roundrobin
    option nolinger
    option httpchk GET /ready

    server serv-1 1.2.3.1:80 check weight 8 maxconn 5000
    server serv-2 1.2.3.2:80 check weight 8 maxconn 5000
    server serv-3 1.2.3.3:80 check weight 12 maxconn 5000
    server serv-4 1.2.3.4:80 check weight 12 maxconn 5000

listen admin
    mode http
    timeout connect 10s
    bind 1.2.3.5:8080
    stats enable
    stats realm Haproxy\ Statistics