HAProxy

    # Simple configuration for an HTTP proxy listening on port 80 on all
    # interfaces and forwarding requests to a single backend "servers" with a
    # single server "server1" listening on 127.0.0.1:8000
    global
        daemon
        maxconn 256

    defaults
        mode http
        timeout connect 5000ms
        timeout client 50000ms
        timeout server 50000ms

    frontend http-in
        bind *:12345
        default_backend servers

    backend servers
        server server1 192.168.1.161:80 maxconn 32
        server server2 192.168.1.82:80 maxconn 32

CONTAINER=haproxy
IMAGE=haproxy:1.9.4

DIR=`pwd -P`

docker stop $CONTAINER
docker rm $CONTAINER

docker run -d \
--net host \
--restart=always \
-v $DIR/conf:/usr/local/etc/haproxy:ro \
--name $CONTAINER \
$IMAGE

docker logs -f $CONTAINER