this post was submitted on 17 Jul 2023
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Grub-btrfs troubles (beehaw.org)
submitted 1 year ago by luckless@beehaw.org to c/linux@lemmy.ml
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Hello all, I'm having some network problems on my server (Ubuntu Lunar Lobster Server Edition), namely my plex port is no longer reachable from outside the network despite it being port forwarded and allowed through ufw. A few days ago I used airvpn's eddie gui program, and it completely wrecked my network. Caused it to be completely cut off from internet when disabled, even with the killswitch function off.

I rolled back to a snapshot I'd made earlier using snapper and grub-btrfs and thought the problem was solved. But while I regained the ability to access the internet, it still seems to have messed something up. I can't seem to get my kernel upgraded. I have 6.2.0-25 installed, but I can only boot into 6.2.0-24, even when I apt removed the older kernel. I believe this is what is causing my networking issues, though even if it's not I'd need a solution so as to be able to keep my kernel updated.

I'm at a bit of a loss at this point and am wondering if I've dug myself in too deep with grub-btrfs. I'm contemplating getting a fresh image on there and sticking to manual use of snapper.

Any help would be much appreciated, thanks.

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[–] slowbyrne@beehaw.org 1 points 1 year ago (2 children)

Only thing I can think of is the subvolumes left over might be causing an issue. I don't know how snapper performs a rollback and I've seen a couple ways to do it. Sometimes its modifying the default subvolume to the snapshot you want to rollback to. This is fine IF your kernel params are NOT specifying the subvol. That would look like this rootflags=subvol=subvolume_name.

Usually I just rename the subvols and make sure the snapshot I'm renaming to replace the current root subvol is not set to read only.

So rename current root to root.broken Then rename snapshot to root Then set readonly prop to false.

[–] luckless@beehaw.org 1 points 1 year ago

I think you've hit the nail on the head. The way grub-btrfs works is by changing the default root snapshot subvolume. I'm still not sure what I did wrong to get the rollback stuck to the particular kernel. But I'll give what you've written here a try. Thanks again.

[–] luckless@beehaw.org 1 points 1 year ago* (last edited 1 year ago) (1 children)

Well, I tried rolling back to another snapshot and checked my kernel params and its not in there. My port issue seems to be fixed but i still do not boot into the new kernel after updating and rebooting. Edit: I think I need to clean up my /boot directory somehow since it's partition is not btrfs. But I'm unsure how to do it, or where to read up on it.

[–] slowbyrne@beehaw.org 1 points 1 year ago (1 children)

Well as long as you take a snapshot of your data and move that snapshot to another drive, you're free to tinker without real worry. Arch Linux wiki should have lots of examples of what you're trying to fix or modify. There's always a fresh install as well, which isn't ideal most of the time but as long as the data is safe, then its an option. Best of luck, hope you're able to resolve the issue.

[–] luckless@beehaw.org 2 points 1 year ago

Thanks, it's looking like I'll be doing a reset. It looks like grub-btrfs creates its own entries and points towards the boot directory within the /.snapshot/ directory, completely ignoring my boot partitions current files.

Ubuntu was never my first choice but was necessary for using my arc380 with plex transcoding. Might as well take this opportunity to move back to debian with bookworm. Only trouble is I would prefer a 6.2 over 6.1 kernel distribution, and while I enjoy arch on my laptops, I'm not sure I'd want to update my server so frequently.