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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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ELI5: What is an immutable OS, in practical terms? (feddit.de)

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

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I've heard of immutable OS's like Fedora Silverblue. As far as I understand it, this means that "system files" are read-only, and that this is more secure.

What I struggle to understand is, what does that mean in practical terms? How does installing packages or configuring software work, if system files can't be changed?

Another thing I don't really understand is what the benefits as an end user? What kinds of things can I do (or can be done by malware or someone else) to my Arch system that couldn't be done on an immutable system? I get that there's a security benefit just in that malware can't change system files -- but that is achieved by proper permission management on traditional systems too.

And I understand the benefit of something declarative like NixOS or Guix, which are also immutable. But a lot of OS's seem to be immutable but not purely declarative. I'm struggling to understand why that's useful.

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[–] [email protected] 6 points 1 year ago

This is, IMO, the biggest yet least obvious advantage of immutable systems. A traditional Linux environment is "just as safe" as the immutable setups, if only the user/administrator is perfect, never makes a mistake, and always makes the right decisions for now and the future.

Given reality tends to differ from the above, having a system that, at a bare minimum, provides you the "oh shit go back" button to system-level changes, and at best provides a clear, reproducible, trail of actions, is a huge advantage for long-term stability for all users, experienced or not. I've been through the school of hard knocks far too many times maintaining everything from server setups to gaming desktops the traditional way, and have committed to "early adopting" immutable distros for pretty much everything except the gaming setup (given the whole suite of proprietary and out-of-date/out-of-touch applications that are basically necessary in that space and not-fully-compatible with the sandboxes and abstraction layers necessary).