Nextcloud docker compose with exposed port, works with jwilder/nginx-proxy and jrcs/letsencrypt-nginx-proxy-companion for SSL/TLS secure access.

nextcloud_docker-compose.yml

version: '2'

volumes:
  nextcloud:
  nextcloudDB:

services:
  db:
    image: mariadb
    restart: always
    volumes:
      - nextcloudDB:/var/lib/mysql
    environment:
      - MYSQL_ROOT_PASSWORD=<really secure pass>
      - MYSQL_PASSWORD=<database password>
      - MYSQL_DATABASE=nextcloud
      - MYSQL_USER=nextcloud
    network_mode: bridge

  app:
    image: nextcloud
    links:
      - db
    ports:
      - 8080:80
    volumes:
      - nextcloud:/var/www/html
    environment:
      - VIRTUAL_HOST=nextcloud.example.com
      - LETSENCRYPT_HOST=nextcloud.example.com
      - MYSQL_HOST=db
    depends_on:
      - db
    network_mode: bridge
    restart: always