/var/lib/docker/volumes/nextcloud_nextcloud/_data/data/user/files

MYSQL_ROOT_PASSWORD=***********************
MYSQL_DATABASE=nextcloud
MYSQL_USER=nextcloud
MYSQL_PASSWORD=************************************
MYSQL_HOST=db

NEXTCLOUD_VERSION=13.0
NEXTCLOUD_ADMIN_USER=example
NEXTCLOUD_ADMIN_PASSWORD=********************************
NEXTCLOUD_TABLE_PREFIX=nc_
NEXTCLOUD_DATA_DIR=/home/iamdocker/nextcloud/data/

version: '2'

volumes:
  nextcloud:
  db:

services:
  db:
    image: mariadb
    env_file:
      - .env
    restart: always
    volumes:
      - db:/var/lib/mysql
    environment:
      - MYSQL_ROOT_PASSWORD=${MYSQL_ROOT_PASSWORD}
      - MYSQL_DATABASE=${MYSQL_DATABASE}
      - MYSQL_USER=${MYSQL_USER}
      - MYSQL_PASSWORD=${MYSQL_PASSWORD}

  app:
    image: nextcloud:${NEXTCLOUD_VERSION}
    env_file:
      - .env
    ports:
      - 8081:80
    links:
      - db
    volumes:
      - nextcloud:/home/iamdocker/nextcloud/
    environment:
      - NEXTCLOUD_ADMIN_USER=${NEXTCLOUD_ADMIN_USER}
      - NEXTCLOUD_ADMIN_PASSWORD=${NEXTCLOUD_ADMIN_PASSWORD}
      - NEXTCLOUD_TABLE_PREFIX=${NEXTCLOUD_TABLE_PREFIX}
      - NEXTCLOUD_DATA_DIR=${NEXTCLOUD_DATA_DIR}
    restart: always