docker-socket-proxy/haproxy.cfg

global
    log stdout format raw daemon "${LOG_LEVEL}"

    pidfile /run/haproxy.pid
    maxconn 4000

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

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 /usr/local/etc/haproxy/errors/400.http
    errorfile 403 /usr/local/etc/haproxy/errors/403.http
    errorfile 408 /usr/local/etc/haproxy/errors/408.http
    errorfile 500 /usr/local/etc/haproxy/errors/500.http
    errorfile 502 /usr/local/etc/haproxy/errors/502.http
    errorfile 503 /usr/local/etc/haproxy/errors/503.http
    errorfile 504 /usr/local/etc/haproxy/errors/504.http

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

frontend dockerfrontend
    bind :2375
    http-request deny unless METH_GET || METH_POST { env(POST) -m bool } || METH_DELETE { env(DELETE) -m bool }
    http-request allow if { path,url_dec -m reg -i ^(/v[\d\.]+)?/auth } { env(AUTH) -m bool }
    http-request allow if { path,url_dec -m reg -i ^(/v[\d\.]+)?/build } { env(BUILD) -m bool }
    http-request allow if { path,url_dec -m reg -i ^(/v[\d\.]+)?/commit } { env(COMMIT) -m bool }
    http-request allow if { path,url_dec -m reg -i ^(/v[\d\.]+)?/configs } { env(CONFIGS) -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\.]+)?/distribution } { env(DISTRIBUTION) -m bool }
    http-request allow if { path,url_dec -m reg -i ^(/v[\d\.]+)?/events } { env(EVENTS) -m bool }
    http-request allow if { path,url_dec -m reg -i ^(/v[\d\.]+)?/exec } { env(EXEC) -m bool }
    http-request allow if { path,url_dec -m reg -i ^(/v[\d\.]+)?/images } { env(IMAGES) -m bool }
    http-request allow if { path,url_dec -m reg -i ^(/v[\d\.]+)?/info } { env(INFO) -m bool }
    http-request allow if { path,url_dec -m reg -i ^(/v[\d\.]+)?/networks } { env(NETWORKS) -m bool }
    http-request allow if { path,url_dec -m reg -i ^(/v[\d\.]+)?/nodes } { env(NODES) -m bool }
    http-request allow if { path,url_dec -m reg -i ^(/v[\d\.]+)?/_ping } { env(PING) -m bool }
    http-request allow if { path,url_dec -m reg -i ^(/v[\d\.]+)?/plugins } { env(PLUGINS) -m bool }
    http-request allow if { path,url_dec -m reg -i ^(/v[\d\.]+)?/post } { env(POST) -m bool }
    http-request allow if { path,url_dec -m reg -i ^(/v[\d\.]+)?/secrets } { env(SECRETS) -m bool }
    http-request allow if { path,url_dec -m reg -i ^(/v[\d\.]+)?/services } { env(SERVICES) -m bool }
    http-request allow if { path,url_dec -m reg -i ^(/v[\d\.]+)?/session } { env(SESSION) -m bool }
    http-request allow if { path,url_dec -m reg -i ^(/v[\d\.]+)?/swarm } { env(SWARM) -m bool }
    http-request allow if { path,url_dec -m reg -i ^(/v[\d\.]+)?/system } { env(SYSTEM) -m bool }
    http-request allow if { path,url_dec -m reg -i ^(/v[\d\.]+)?/tasks } { env(TASKS) -m bool }
    http-request allow if { path,url_dec -m reg -i ^(/v[\d\.]+)?/version } { env(VERSION) -m bool }
    http-request allow if { path,url_dec -m reg -i ^(/v[\d\.]+)?/volumes } { env(VOLUMES) -m bool }
    # POST requests
    http-request allow if { path,url_dec -m reg -i ^(/v[\d\.]+)?/containers/create } { env(CONTAINERS_CREATE) -m bool }
    http-request allow if { path,url_dec -m reg -i ^(/v[\d\.]+)?/containers/prune } { env(CONTAINERS_PRUNE) -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/[a-zA-Z0-9_.-]+/resize } { env(CONTAINERS_RESIZE) -m bool }
    http-request allow if { path,url_dec -m reg -i ^(/v[\d\.]+)?/containers/[a-zA-Z0-9_.-]+/start } { env(CONTAINERS_START) -m bool }
    http-request allow if { path,url_dec -m reg -i ^(/v[\d\.]+)?/containers/[a-zA-Z0-9_.-]+/update } { env(CONTAINERS_UPDATE) -m bool }
    http-request allow if { path,url_dec -m reg -i ^(/v[\d\.]+)?/containers/[a-zA-Z0-9_.-]+/rename } { env(CONTAINERS_RENAME) -m bool }
    http-request allow if { path,url_dec -m reg -i ^(/v[\d\.]+)?/containers/[a-zA-Z0-9_.-]+/pause } { env(CONTAINERS_PAUSE) -m bool }
    http-request allow if { path,url_dec -m reg -i ^(/v[\d\.]+)?/containers/[a-zA-Z0-9_.-]+/unpause } { env(CONTAINERS_UNPAUSE) -m bool }
    http-request allow if { path,url_dec -m reg -i ^(/v[\d\.]+)?/containers/[a-zA-Z0-9_.-]+/attach } { env(CONTAINERS_ATTACH) -m bool }
    http-request allow if { path,url_dec -m reg -i ^(/v[\d\.]+)?/containers/[a-zA-Z0-9_.-]+/wait } { env(CONTAINERS_WAIT) -m bool }
    http-request allow if { path,url_dec -m reg -i ^(/v[\d\.]+)?/containers/[a-zA-Z0-9_.-]+/exec } { env(CONTAINERS_EXEC) -m bool }
    http-request allow if { path,url_dec -m reg -i ^(/v[\d\.]+)?/volumes/create } { env(VOLUMES_CREATE) -m bool }
    http-request allow if { path,url_dec -m reg -i ^(/v[\d\.]+)?/volumes/prune } { env(VOLUMES_PRUNE) -m bool }
    http-request allow if { path,url_dec -m reg -i ^(/v[\d\.]+)?/networks/create } { env(NETWORKS_CREATE) -m bool }
    http-request allow if { path,url_dec -m reg -i ^(/v[\d\.]+)?/networks/prune } { env(NETWORKS_PRUNE) -m bool }
    http-request allow if { path,url_dec -m reg -i ^(/v[\d\.]+)?/images/create } { env(IMAGES_CREATE) -m bool }
    http-request allow if { path,url_dec -m reg -i ^(/v[\d\.]+)?/images/prune } { env(IMAGES_PRUNE) -m bool }
    http-request allow if { path,url_dec -m reg -i ^(/v[\d\.]+)?/networks/[a-zA-Z0-9_.-]+/connect } { env(NETWORKS_CONNECT) -m bool } 
    http-request allow if { path,url_dec -m reg -i ^(/v[\d\.]+)?/networks/[a-zA-Z0-9_.-]+/disconnect } { env(NETWORKS_DISCONNECT) -m bool } 
    
    # DELETE requests
    http-request allow if METH_DELETE { path,url_dec -m reg -i ^(/v[\d\.]+)?/networks/[a-zA-Z0-9_.-]+ } { env(NETWORKS_DELETE) -m bool }
    http-request allow if METH_DELETE { path,url_dec -m reg -i ^(/v[\d\.]+)?/containers/[a-zA-Z0-9_.-]+ } { env(CONTAINERS_DELETE) -m bool }
    http-request allow if METH_DELETE { path,url_dec -m reg -i ^(/v[\d\.]+)?/images/[a-zA-Z0-9_.-]+ } { env(IMAGES_DELETE) -m bool }
    http-request allow if METH_DELETE { path,url_dec -m reg -i ^(/v[\d\.]+)?/volumes/[a-zA-Z0-9_.-]+ } { env(VOLUMES_DELETE) -m bool }

    http-request deny
    default_backend dockerbackend