Tutorial updated to working 
Details are on the tutorial changelog
Github Issue details:
Latest working, testing, Docker deployment of LibreNMS (fresh install)
MariaDB
docker run \
-v /volume1/docker/mariadb:/var/lib/mysql \
-e MYSQL_ROOT_PASSWORD=root_password \
-e TZ=Asia/Singapore \
--name mariadb \
-d \
--restart always \
mariadb:latest \
--innodb_file_per_table=1 \
--lower_case_table_names=0
LibreNMS
docker run \
-p 8668:80 \
-e DB_HOST=libredb \
-e DB_NAME=librenms \
-e DB_USER=librenms \
-e DB_PASS=libre_password \
-e APP_KEY=base64:THE_GENERATED_KEY \
-e BASE_URL=http://YOUR_NAS_IP:8668 \
-e TZ=Asia/Singapore \
--link mariadb:libredb \
-v /volume1/docker/librenms/logs:/opt/librenms/logs \
-v /volume1/docker/librenms/rrd:/opt/librenms/rrd \
-v /volume1/docker/librenms/custom.config.php:/opt/librenms/conf.d/custom.config.php:ro \
--name librenms \
-d \
--restart always \
jarischaefer/docker-librenms:latest