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How I accidentally wiped my server by having a typo in my Nextcloud docker config (feddit.it)

submitted 1 year ago* (last edited 1 year ago) by [email protected] to c/[email protected]

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So, I moved my nextcloud directory from a local SATA drive to a NFS mount from a nvme array on a 10G network

"I just need to change /docker/nextcloud to /mnt/nfs/nextcloud in the docker-compose.yml, what's the issue, i do it live" - i tell myself

So i stop the container, copy /docker/nextcloud to /mnt/nfs/nextcloud, then edit the docker-compose.yml... and.... because I'm doing it during a phone call without paying too much attention i change the main directory to /docker

I rebuild the container and I immediately hear a flood of telegram notifications from my uptime-kuma bot.... oh oh...

Looks like the nextcloud docker image has an initialization script that if it doesn't find the files in the directory, it will delete everything and install a fresh copy of nextcloud... so it deleted everything on my server

Luckily i had a very recent full borg backup and i'm restoring it (i kinda love-hate borg, i always forget the restore commands when in panic and the docs are a bit cryptic for me)

Lessons learned:

always double check everything
offsite backups are a must (if i accidentally wrote / as path, i would have lost also the borg backups!)
offsite backups should not be permanently mounted, otherwise they would have been wiped as well
learn how to use and schedule filesystem snapshots, so the recovery wouldn't take ages like it's taking right now (2+ hours and i'm not even half way...)

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[–] [email protected] 4 points 1 year ago

Using snapshots on a copy-on-write filesystem such as zfs or btrfs is actually a very good idea. There exist auto-snapshot services that are quite easy to set up and take snapshots with different granularity and maximum number of kept snapshots e.g. every 15m, hour, day, week.

Please note that even snapshots and RAID never replace an off-site backup. When setting up Nextcloud I was even so paranoid and configured the backups to be pulled by the remote machine where they will be stored (and the Nextcloud machine does not even have credentials to access it).