Nextcloud

• Create folder /volume1/docker/nextcloud and create or update here the following:

  • An .env file with your data (e.g.):

    HOST_NAME=your.domain
    HOST_IP=192.168.1.1
    WEB_PORT=8080

  • Passwords for DB (random/strong) & SMTP server

    • db_password.txt

    • smtp_password.txt

  • The official suggested nginx.conf file

• Container Manager

• Create new project nextcloud on above folder with the content below

• Control Panel -> Login Portal -> Advanced -> Reverse Proxy

• Create a new proxy for Nextcloud, e.g. https://your.domain -> http://192.168.1.1:8080

• Enjoy Nextcloud

Assumptions

• You have installed Container Manager

• The folder /volume1/docker has been created

docker-compose.yml

version: '3'

volumes:
  cache:
  html:

services:
  redis:
    image: redis:alpine
    container_name: nextcloud-cache
    restart: unless-stopped
    volumes:
      - cache:/data
    healthcheck:
     test: redis-cli ping || exit 1

  db:
    image: mariadb:jammy
    container_name: nextcloud:alpine
    command: --transaction-isolation=READ-COMMITTED --binlog-format=ROW --innodb-read-only-compressed=OFF
    restart: unless-stopped
    security_opt:
      - no-new-privileges:true
    environment:
      - MYSQL_DATABASE=nextcloud
      - MYSQL_USER=nextcloud_usr
      - MYSQL_ROOT_PASSWORD_FILE=/run/secrets/db_password
      - MYSQL_PASSWORD_FILE=/run/secrets/db_password
    secrets:
      - db_password

  app:
    image: nextcloud:fpm-alpine
    container_name: nextcloud-app
    restart: unless-stopped
    volumes:
      - html:/var/www/html
    environment:
      - REDIS_HOST=redis
      - NC_default_phone_region=IT
      - MYSQL_HOST=db
      - MYSQL_PORT=3307
      - MYSQL_DATABASE=nextcloud
      - MYSQL_USER=nextcloud_usr
      - MYSQL_PASSWORD_FILE=/run/secrets/db_password
      - NEXTCLOUD_TRUSTED_DOMAINS=${HOST_NAME}
      - TRUSTED_PROXIES=${HOST_IP}
      - OVERWRITEHOST=${HOST_NAME}
      - OVERWRITEPROTOCOL=https
      - SMTP_HOST=your.smtp
      - SMTP_NAME=[e-mail]
      - SMTP_SECURE=ssl
      - SMTP_PASSWORD_FILE=/run/secrets/smtp_password
    secrets:
      - db_password
      - smtp_password
    depends_on:
      redis:
        condition: service_healthy
      db:
        condition: service_started
    healthcheck:
      test: su -p www-data -s /bin/sh -c "php /var/www/html/occ status" | grep productname || exit 1

  web:
    image: nginx:alpine
    container_name: nextcloud-web
    restart: unless-stopped
    ports:
      - ${WEB_PORT}:80
    links:
      - app
    volumes:
      - ./nginx.conf:/etc/nginx/nginx.conf:ro
    volumes_from:
      - app
    healthcheck:
      test: curl -f http://localhost:80/ || exit 1

  cron:
    image: nextcloud:fpm-alpine
    container_name: nextcloud-cron
    entrypoint: /cron.sh
    restart: unless-stopped
    volumes_from:
      - app
    depends_on:
      redis:
        condition: service_healthy
      db:
        condition: service_started

secrets:
  db_password:
    file: db_password.txt
  smtp_password:
    file: smtp_password.txt

Variant: MariaDB on DSM

You can use of course the regular Synology package for MariaDB.

In this case just remove the db service/section in the docker-compose.yml file above and set accordingly MYSQL_HOST variable.

Variant: Shared folder on DSM

You can use a regular folder on your NAS.

• Control Panel -> Shared Folders

• Create new nextcloud shared folder

• On tab General, check only "Hide this shared folder..."

• Set permissions for www-data user/group (ID 82 in alpine images) to that folder (e.g. /volume1/nextcloud/data)

  sudo chown 82:82 -R /volume1/nextcloud/data
  sudo chmod 0770 -R /volume1/nextcloud/data

• Add the proper mapping to the app service in docker-compose.yml

  app:
    image: nextcloud:fpm-alpine
    container_name: nextcloud-app
    restart: unless-stopped
    volumes:
      - html:/var/www/html
      - /volume1/nextcloud/data:/var/www/html/data:rw
    # etc ...

Migrate existing installation

The following instructions are based on official documentation referenced here below and some practical experience.

1. Prepare a brand new stack of Nextcloud (i.e. destination), by also adding the admin user

2. (opt?) Stop it

3. From the source stack of Nextcloud

   • Copy or move html/config/config.php

   • Copy or move html/data/, and make sure user www-data has 0770 permissions

   • Copy or move DB

4. Start the destination again

Backup and restore MariaDB

• Backup

  mysqldump -u root -p{yourpassword} nextcloud > {dumpfile}

• Restore

  mysql --user root --password nextcloud < {dumpfile}

• Running commands from DSM shell

  sudo /volume1/@appstore/MariaDB10/usr/local/mariadb10/bin/mysql...   

• Running commands from container

  sudo docker exec nextcloud-db sh -c "mysql..."   

Permissions on data folder

• Data folder: /var/www/html/data

• Owner: www-data/www-data

• Permissions: 0770

Depending of used architecture in containers, you should use www-data internal ID instead of user/group names.

• Apache: 33

• FPM/nginx: 82

How to

Recover data when seems lost

For some reason data could disappear but is still present on file system.

Try to rescan files using the command php occ files:scan --all.

Fix errors when configuring SMTP

• Double check the right settings (i.e. port 465); see https://support.google.com/mail/answer/7126229

• (Google) Generate an app password for Nextcloud

Clear all logs

• Set maintenance mode ON

• Delete data/nextcloud.log file

• Set maintenance OFF

Unblock a locked file

If you get an HTTP 423 (file locked) error, you could fix as documented.

• Set maintenance mode ON

• Clean the locks table oc_file_locks

  DELETE FROM oc_file_locks WHERE 1;

• Set maintenance OFF

References

• Docker image of Nextcloud
• Synology: How to Install Nextcloud Using Docker
• Migrating to a different server