Restore Nextcloud docker instance

For some reason my Nextcloud Docker image was not listed anymore in the "running" section.

1. So I did a backup of the the "sharedfolders/AppData" and "sharedfolders/Nextcloud" folders.
2. Started the Nextcloud docker again, with the according config, data and port parameters.

Now, when I'm trying to access Nextcloud via https://192.168.0.11:444, I get following:

Digging deeper into the nginx logs it looks like it cannot connect to the DB. Probably because the IP of the DB has changed:

[error] 330#330: *2 FastCGI sent in stderr: "PHP message: PHP Fatal error:  Uncaught Doctrine\DBAL\DBALException: Failed to connect to the database: An exception occurred in driver: SQLSTATE[HY000] [2002] No such file or directory in /config/www/nextcloud/lib/private/DB/Connection.php:64

How and where do I have to update the Nextcloud config, when I don't get the "Nextcloud Installer GUI" served?

Thanks in advance.

I thought so too, but I could only find a "config.sample.php" there.

So maybe the best is to do a fresh re-install. Luckily I didn't have much modification done on the previous Nextcloud installation yet.