this post was submitted on 30 Aug 2023
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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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systemd manages cgroups, a very well standardized kernel interface for process management, which I would say is something init should be able to do. The gap between that, and a container is mostly semantic.
Personally I'd like my container/vm/chroot handled by something detached from pid 1. I get that much of the overal systemd project is separate blocks of code but it's the fact they are bound together that it becomes an issue. I would have loved for the systemd team yo first publish a set of APIs that all their components would us and allow the same integration while being completely different projects.
Yeah the preference is yours, at the end of the day, I don't think it matters what tools you use as long as it works.
Worth noting is that a process not managed by pid 1 isn't really a thing you want generally. If you use systemd to start the docker daemon, which then starts your container, its still managed by pid 1 eventually. Perhaps you prefer the tooling and interface of docker more than machinectl, or maybe podman just isnt working for you, they're all just tools to interact with kernel namespaces and cgroups. For doing a little dabbling in another distro, installing docker is pretty heavy vs what the article is talking about.
That would be true if other systems and services depend on them. Would have been nice to come out with a standard and designed systemd around that standard. Then you pick the tool you want that follows the standard rather than be tied into systemd.
I would disagree. A compromised Docker doesn't mean i have access to things managed by PID1. The entire control model is based around moving your publicly available services further away from something with the highest level of access. Be it users or processes.