this post was submitted on 26 Mar 2024
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Linux
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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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in systemd runlevels are basically just targets (it still sets rc?.d symlinks in /etc akaik) which have services they want and are wanted by, it's the basis for dependency handling plus you get cool security features like syscall filtering, capability limits, user switching, etc
Well in Void (using runit) each runlevel is just a directory with symlinks to the services.
I didn't realize systemd had these security features (except for user/group switching, which is pretty standard). You can get those with other init systems, but it's probably easier on systemd so I assume more people actually do it. I wonder if average distros take the time to harden their unit files.