After following the instructions you should be able to call in your browser:

site1.org     -> Routed to site1 container
site1.org/sub/ -> Routed to site1sub container
site2.org     -> Routed to site2 container

A overlay network has to be created first using the following command:

docker network create --driver overlay --scope swarm proxy

docker stack deploy -c proxy\docker-compose.treafik.yml proxy

docker stack deploy -c viz\docker-compose.viz.yml viz

docker stack deploy -c site1\docker-compose.web.yml site1

docker stack deploy -c site2\docker-compose.web.yml site2

docker stack deploy -c site1sub\docker-compose.web.yml site1sub

Add the host site1.org and site2.org to your hosts file.

On windows 10 the hosts files is under: C:\Windows\System32\drivers\etc

On a mac the hosts file is under: /private/etc

Add the following lines.

127.0.0.1       site1.org
127.0.0.1       site2.org
127.0.0.1       viz.org

Traefik offers a nice stats page. Open your browser and navigate to localhost/dashboard.

It is now possible to scale your webservice to as many containers as needed. Traefik will take care of load balancing all of them.

docker service scale site1_site1=2
docker service scale site2_site2=3
docker service scale site1sub_site1sub=5

This repo is based on this HAProxy-Docker-Sample but uses Traefik.