Nginx reverse proxy with automatic https certificate generation from Letsencrypt https://letsencrypt.org/.

docker-compose.yml

proxy:
  image: jwilder/nginx-proxy
  volumes:
    - ./opt/certs:/etc/nginx/certs:ro 
    - /etc/nginx/vhost.d
    - /usr/share/nginx/html
    - /var/run/docker.sock:/tmp/docker.sock:ro
  ports:
    - "80:80"
    - "443:443"
  restart: always

le:
  image: jrcs/letsencrypt-nginx-proxy-companion
  volumes:
    - /var/run/docker.sock:/var/run/docker.sock:ro
    - ./opt/certs:/etc/nginx/certs:rw
  volumes_from:
    - proxy
  restart: always

Then start any containers you want to be proxied with a env var VIRTUAL_HOST=subdomain.youdomain.com. To use the Let's Encrypt service to automatically create a valid certificate for virtual host(s). Set the following environment variables to automatically create a valid certificate
LETSENCRYPT_HOST
LETSENCRYPT_EMAIL
The LETSENCRYPT_HOST variable most likely needs to be the same as the VIRTUAL_HOST variable and must be publicly reachable domains. Specify multiple hosts with a comma delimiter. The LETSENCRYPT_EMAIL variable must be a valid email address