Use domain name for nextcloud and use postgres as database backend.

nextcloud/readme.md

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+# Nextcloud
+
+## Installation
+
+Installation of nextcloud is easy. Just pull the image and navigate with the browser to the new instance.
+Enter database connection and create a user.
+
+### Enable caching
+
+Options must be entered to nextcloud's configuration file.
+
+- Local cache APCu: `'memcache.local' => '\OC\Memcahe\APCu',`
+- Distributed cache Redis: `'memcache.distributed' => '\OC\Memcache\Redis',`
+- File locking Redis: `'memcache.locking' => '\OC\Memcache\Redis',`
+- Configuration for Redis:
+````
+  'redis' => array (
+  'host' => 'redis',
+  'port' => 6379,
+  ),
+````
+
+## Migration to new instance
+
+Create a new installation of nextcloud. Afterwards drop the database and create it from scratch.
+Dump in the data and copy user data to new instance.
+
+## Updating nextcloud
+
+Just update the image version in the compose file and do a ``docker compose pull``
+
+## Database migration
+
+Convert the database from mysql to pgsql:
+
+````
+docker exec -it -u www-data NEXTCLOUD_CONTAINER_NAME php occ db:convert-type --all-apps --password "YOUR_PASSWORD" pgsql DB_USER DB_HOST DB_NAME
+````