Please start with the official docker-compose file - this is doesn’t cover everything you want (e.g. no cron and redis) but it is good starting point…
version: '2'
volumes:
nextcloud:
db:
services:
db:
image: mariadb
restart: always
command: --transaction-isolation=READ-COMMITTED --binlog-format=ROW
volumes:
- db:/var/lib/mysql
environment:
- MYSQL_ROOT_PASSWORD=
- MYSQL_PASSWORD=
- MYSQL_DATABASE=nextcloud
- MYSQL_USER=nextcloud
app:
image: nextcloud
restart: always
ports:
- 8080:80
links:
- db
volumes:
- nextcloud:/var/www/html
environment:
- MYSQL_PASSWORD=
- MYSQL_DATABASE=nextcloud
- MYSQL_USER=nextcloud
- MYSQL_HOST=db
another more complex setup I posted here. But I strongly recommend to start with an easy example and add complexity once more simple setup works.