Two different web app on docker-compose using haproxy

multiple_apps_on_docker_compose_with_haproxy

Hierarchy
src -firstApp(django)
        - Dockerfile
        - anyother necessaries
    -secondApp(hello-world)
        - Dockerfile
        - anyother necessaries
    -haprxy
        - Dockerfile
        - haproxy.cfg
    - docker-compose.yml



# docker-compose.yml

version: "3"

services:
    web1:
        build: ./Ass
        volumes:
            - ./Ass:/src
        container_name: django
#        ports:
#            - "81:8000" # only if you need to access directly.
    web2:
        image: dockercloud/hello-world  #image or build 
        container_name: web2
    haproxy:
        build: ./haproxy
        container_name: haproxy
        ports:
           - "80:80"

# haproxy.cfg

global

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

frontend http-in
    bind *:80

    acl has_web1 path_beg /web1
    acl has_web2 path_beg /web2

    use_backend web1 if has_web1
    use_backend web2 if has_web2

    default_backend web1
    
backend web1
    reqrep ^([^\ ]*\ /)web1[/]?(.*)   \1\2
    server web1 web1:8000 check  # web1:80 is the service name

backend web2
    reqrep ^([^\ ]*\ /)web2[/]?(.*)   \1\2
    server web2 web2:80 check
    
# haproxy Docerfile

FROM haproxy:1.7
COPY haproxy.cfg /usr/local/etc/haproxy/haproxy.cfg


# django Dockerfile

FROM python:3.5
ENV PYTHONBUFFERED 1
ADD /requirements.txt /config/
COPY start.sh /start.sh
RUN pip install -r /config/requirements.txt
EXPOSE 8000 # EXPOSE port 8000 to allow communication to/from server
COPY /static /static
RUN mkdir /src;
WORKDIR /src
CMD ["/start.sh"]


# requirements.txt

dependency==version
Django==1.11.2
...


# start.sh

echo Starting Gunicorn
python3 manage.py collectstatic #if you need to serve static files, you need to set nginx as well
exec gunicorn SiteName.wsgi:application \
    --bind 0.0.0.0:8000 \
    --workers 3