I run nextcloud together with mariadb in a docker container. This kind of problem is often discussed with native nextcloud installations, but not with docker container.
My docker-compose.yml looks like this:
version: '2'
services:
nextcloud-db:
image: mariadb:latest
container_name: nextcloud-db
restart: always
hostname: nextcloud-db
environment:
MYSQL_ROOT_PASSWORD: s3cr3t_NCpw
MYSQL_DATABASE: ncdb
MYSQL_USER: nextcloud-dbuser
MYSQL_PASSWORD: s3cr3t_NCpw
volumes:
- /srv/docker-persist/MariaDB/nextcloud-sql:/var/lib/mysql
nextcloud:
image: nextcloud:stable
container_name: nextcloud
restart: unless-stopped
ports:
- 80:80
volumes:
- /srv/docker-persist/Nextcloud:/var/www/html
- /mnt/NC/containers/cloud/nextcloud/data:/var/www/html/data
depends_on:
- nextcloud-db
Obviously i want to use an external storage, which is mounted at /mnt/NC, as my data directory.
My /etc/fstab is this:
UUID=D24E7C0D4E7BE89D /mnt/NC/ ntfs-3g utf8,dmask=007,fmask=007,umask=007,noatime 0
A few weeks ago i run nextcloud native on my system WITHOUT docker, and this fstab works perfectly with nextcloud - sure, i had UID/GID www-data inside fstab, but this one is missing, cause nextcloud is running inside docker - i think here is the Problem.
So there is no www-data user/group on my system ONLY in my docker container.
I already changed the permission for /mnt/NC to 755.
drwxrwx--- 1 root root 4096 18. Jul 16:51 NC
Changing the user/group dont work - sure, because there is no www-data on my system:
chown -R www-data:www-data /mnt/NC
chown: invalid user: „www-data:www-data“
Inside my docker container, the permission looks like this:
...
-rw-r--r-- 1 www-data www-data 5048 Jul 18 14:44 cron.php
drwxr-xr-x 2 www-data www-data 4096 Jul 18 14:44 custom_apps
drwxrwx--- 1 root root 4096 Jul 18 14:21 data
-rw-r--r-- 1 www-data www-data 156 Jul 18 14:44 index.html
-rw-r--r-- 1 www-data www-data 2976 Jul 18 14:44 index.php
...
You can see, data is root:root. Changing the user/group to www-data has no effect:
chown -R www-data:www-data ./data/
Still:
drwxrwx--- 1 root root 4096 Jul 18 14:21 data
All in all, i’ll get the error message inside the web interface:
The data directory / var / www / html / data cannot be created or cannot be written to.
So… whats next?
