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Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).

Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.

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One single partition for Linux versus using a partition table? (slrpnk.net)

submitted 1 year ago by [email protected] to c/[email protected]

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Heya folks, some people online told me I was doing partitions wrong, but I’ve been doing it this way for years. Since I’ve been doing it for years, I could be doing it in an outdated way, so I thought I should ask.

I have separate partitions for EFI, /, swap, and /home. Am I doing it wrong? Here’s how my partition table looks like:

FAT32: EFI
BTRFS: /
Swap: Swap
Ext4: /home

I set it up this way so that if I need to reinstall Linux, I can just overwrite / while preserving /home and just keep working after a new install with very few hiccups. Someone told me there’s no reason to use multiple partitions, but several times I have needed to reinstall the OS (Linux Mint) while preserving /home so this advice makes zero sense for me. But maybe it was just explained to me wrong and I really am doing it in an outdated way. I’d like to read what you say about this though.

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[–] [email protected] 2 points 1 year ago (2 children)

It's not wrong, as such, but simply not right. Since you're using btrfs, having a separate partition for home makes little sense. I, personally, also prefer using a swapfile to a swap partition, but that's potato/potato.

[–] [email protected] 1 points 1 year ago (3 children)

Also, if I don’t indicate a swap partition during install, would the OS use swap files automatically?

[–] kalkulat 2 points 1 year ago* (last edited 1 year ago) (1 children)

I think the last time I installed Mint (21.2) it DID create a swapfile. Don't use it, so commented that out in /ETC/FSTAB.

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

Thanks!

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

I don't know, haven't used Mint in a decade. It's not difficult to set it up, though.

[–] [email protected] 1 points 1 year ago (1 children)

Alright, but actually I don’t think I’m maximizing my use of btrfs. I only use btrfs because of its compatibility with Linux Mint’s Timeshift tool. Would you be implying if I used btrfs for the whole partition, I can reinstall / without overwriting /home?

[–] [email protected] 4 points 1 year ago (1 children)

BTRFS has a concept called a subvolume. You are allowed to mount it just like any other device. This is an example /etc/fstab I've copied from somewhere some time ago.

UUID=49DD-6B6F                                  /efi            vfat    defaults        0 2
UUID=701c73d7-58b5-4f90-b205-0bb56a8f1d96       /               btrfs   subvol=@root    0 0
UUID=701c73d7-58b5-4f90-b205-0bb56a8f1d96       /home           btrfs   subvol=@home    0 0
UUID=701c73d7-58b5-4f90-b205-0bb56a8f1d96       /opt            btrfs   subvol=@opt     0 0
UUID=701c73d7-58b5-4f90-b205-0bb56a8f1d96       /srv            btrfs   subvol=@srv     0 0
UUID=701c73d7-58b5-4f90-b205-0bb56a8f1d96       /var            btrfs   subvol=@var     0 0

/efi (or /boot, or /boot/efi, whatever floats your boat) still has to be a separate vfat partition, but all the other mounts are, technically speaking, the same partition mounted many times with a different subvolume set as the target.

Obviously, you don't need to have all of them separated like this, but it allows you to fine tune the parts of system that do get snapshot.

[–] [email protected] 1 points 1 year ago (1 children)

How about when I need to reinstall the OS? Will overwriting / not touch /home like with my current set up?

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

I don't know how mint installer works, but ideally you're never really writing to / of the filesystem to begin with. You always do a subvolume and manipulate that.