HAProxy configuration file for Plone instances

haproxy.cfg

# Configuration file for HAProxy
#
# This file must me symlinked to /etc/haproxy/haproxy.cfg

global
    log /dev/log syslog notice
    chroot /var/lib/haproxy
    stats socket /run/haproxy/admin.sock mode 660 level admin
    user haproxy
    group haproxy
    daemon
    maxconn 256

listen plone
    bind :8080
    mode http
    balance leastconn
    option forwardfor
    option httpclose

    timeout connect 10s
    timeout queue 1m
    timeout client 2m
    timeout server 2m

    retries 3
    option redispatch

    acl backend_down nbsrv lt 1
    monitor-uri /haproxy?monitor
    monitor fail if backend_down

    option tcp-check
    tcp-check send ok\r\n
    tcp-check expect string OK

    default-server maxconn 4 inter 2s slowstart 1m

    server instance1 127.0.0.1:8081 check port 8881
    server instance2 127.0.0.1:8082 check port 8882
    server instance3 127.0.0.1:8083 check port 8883

    log global
    option httplog
    option dontlognull

    stats enable
    stats uri /haproxy?stats
    stats refresh 10s