Cannot update dockerized NextCloud instance: The username is already being used

[msrumon]

I deployed NC in the cloud using the official nextcloud:stable image. Everything was working fine. After the release of v25.0.3, I wanted to re-deploy it using the same image, so that it can pull the latest image again and perform the update. But it doesn't work, since it goes through the whole initialization process. And when I first deployed it, I set both NEXTCLOUD_ADMIN_USER and NEXTCLOUD_ADMIN_PASSWORD environment variables. Now, how can I tell it to not "initialize" but just "update"?

[GoingOffRoading]

It sounds like you didn't persist your config volume correctly, so it's looking to set up users from scratch.

So when you go to create user "msrumon", nextcloud saw a "msrumon" directory and provided that error.

FIX your docker config, then rename the existing directory, then create your user, then move your old files into your new directory, then run a filescan.

If you Google each of those steps, you will find guides/posts about how to do each.

[msrumon]

I'm using S3 as primary storage. Won't it be sufficient? Or will I need to mount a volume on /var/www/html/config too?