haproxy.cfg

global
    log stdout format raw daemon info

    user root
    group root

    daemon

    pidfile /run/haproxy.pid
    maxconn 4000

    # Turn on stats unix socket
    server-state-file /var/lib/haproxy/server-state

    setenv POST 1
    setenv ALLOW_RESTARTS 1
    setenv CONTAINERS 1
    setenv VERSION 1

defaults
    mode http
    log global
    option httplog
    option dontlognull
    option http-server-close
    option redispatch
    retries 3
    timeout http-request 10s
    timeout queue 1m
    timeout connect 10s
    timeout client 10m
    timeout server 10m
    timeout http-keep-alive 10s
    timeout check 10s
    maxconn 3000

    # Allow seamless reloads
    load-server-state-from-file global

    # Use provided example error pages
    errorfile 400 /etc/haproxy/errors/400.http
    errorfile 403 /etc/haproxy/errors/403.http
    errorfile 408 /etc/haproxy/errors/408.http
    errorfile 500 /etc/haproxy/errors/500.http
    errorfile 502 /etc/haproxy/errors/502.http
    errorfile 503 /etc/haproxy/errors/503.http
    errorfile 504 /etc/haproxy/errors/504.http

backend dockerbackend
    server dockersocket /var/run/docker.sock

frontend dockerfrontend
    bind :38379
    http-request deny unless METH_GET || { env(POST) -m bool }
    http-request allow if { path,url_dec -m reg -i ^(/v[\d\.]+)?/containers/[a-zA-Z0-9_.-]+/((stop)|(restart)|(kill)) } { env(ALLOW_RESTARTS) -m bool }
    http-request allow if { path,url_dec -m reg -i ^(/v[\d\.]+)?/containers } { env(CONTAINERS) -m bool }
    http-request allow if { path,url_dec -m reg -i ^(/v[\d\.]+)?/version } { env(VERSION) -m bool }
    http-request deny
    default_backend dockerbackend