this post was submitted on 24 May 2024
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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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Updates have always been pretty painless for me. Most of my problems during updates have come from NVidia drivers (on a laptop), but a fix has always been available from the community.
Concerning you RAID, just make sure the installer doesn't touch it and mount it afterwards. You might have to do some kind of "restore" to give the files the needed SELinux metadata. The Discourse forum would probably be a good place to ask.
Now, a bit about DNF vs RPM-OSTree. Fedora with DNF is the standard distro much like most other distros. Use this if the next part doesn't sound useful to you.
RPM-OSTree is used in a new family of distro that work a bit like git for your OS.
Your system runs off an "atomic" image. Atomic means unsplittable in Greek. Everything you change on your system is applied to your atomic image, like a file is added or removed from a git repo.
This is nice because upgrading to the next major version becomes a simple matter of rebasing you changes on top of the new version, and likewise, rolling back (in case of issues) becomes a single command and a reboot.
Fedora IoT is the "Server" edition of the Atomic desktops. Fedora CoreOS is a more "immutable" approach.
Feel free to ask more questions if something doesn't make sense.
If you're interested in fedora atomic desktops, I would check out one of the uBlue projects (you can even switch back to plain old fedora atomic if you want)