Someone please convince me why I should hate systemd because I still don’t understand why all the hate exists.
The idea as far as I can tell is that it’s responsible for too many things and gives a massive point of failure.
The very existence of a defined kernel is an insult to the Linux philosophy
In some ways I think the filesystem is philosophically the exact opposite of systemd — I can boot my system with an ext4 root, with a btrfs /home…or vice versa. Or add some ZFS, or whatever. The filesystem is (with the exception of some special backup schemes) largely independent of the rest of the system, despite being of core importance.
On the other hand, I can’t change my init system (i.e., systemd) without serious, serious work.
It’s also “infectious” software. The way systemd positions itself on the system, it can make it more difficult for software to be written in an agnostic way. This isn’t all software, and is often more of a complaint by lower level software, like desktop environments.
https://catfox.life/2024/01/05/systemd-through-the-eyes-of-a-musl-distribution-maintainer/
This isn’t a terrible summary of some of the aspects of it.
Another aspect is that when it was first developed, the lead on the project was exceptionally hostile to anyone who didn’t immediately agree that systemd definitely should take over most of the system, often criticizing people who pointed out bugs or questionable design decisions as being afraid of change or relics of the past.
It’s more of a social reason, but if people feel like the developer of a tool they’re forced to use doesn’t even respect their concerns, they’re going to start rejecting the tool.
What do you expect from an init system? It’s like saying my cpu is infectious because my computer depends on it
the develope receive a fuck ton of hate too, and he keep the project going, against every one unix-way haters
Indeed, the Unix philosophy was do one thing and do it well. ls just list directory’s and files it’s not a network manager too. Systemd crams a lot of extra shit into an init.d/rc.
I still prefer the old system-v/openRC setup or BSD’s setup. It’s simple does 1 job and does it well. But I can work with systemd just fine in creating scripts these days and it does have some nice features like user startup scripts baked into it and podman integrates very nicely with it.
My understanding is that some people are die hards to the software philosophy of “do one thing really well”. systemd at the very least does many different things. These people would prefer to chain a bunch of smaller programs together to replicate the same functionality of systemd since every program in the chain fits the philosophy of “does one thing really well”.
For me it’s 3 things
- Do one thing and do it well
- Everything is a file in Linux
- human readable logs
Systemd breaks all three of though by being monolithic and binary. It actually makes you have to jump through more hoops to do things in certain cases. I understand it’s a mindset shift but it really starts making it feel more like Windows with how it works and the registry and event log.
People don’t like it because it’s declarative. It felt cool to be able to just put bash files into certain directories to have them executed on startup. That was elegant, in the sense of “everything’s a file”.
systemd is more of an api than a framework, so it’s a different design paradigm.
I hated systemd until I printed out the docs, for some coffee, and sat in a comfy chair to read them front to back. Then I loved it.
Mostly I hated it because I didn’t know how to do things with it.
Also, “journalctl” is kind of an ugly command. But really, who gives a fuck. It’s a well-designed system.
And if a person absolutely must execute their own arbitrary code they can just declare a command to execute their script file as the startup operation on a unit.
Your comment summarizes my entire programming career.
These steps:
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Be taught that there’s a specific way to do something because the other ways have major issues
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Find something that goes against that specific way and hate it
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After a lot of familiarity, end up understanding it
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Have a mix emotion of both loving it because it functions so well and hating it because it doesn’t align with the rules you’ve set up
Developer cognition is the most expensive resource on any programming project. It is entirely rational to stick to tried and true ways of doing things. A developer’s mind is generally at capacity, and putting some of that capacity into learning new tricks comes at the cost of all the other things that developer can be doing.
And it’s not just a matter of time. Generally speaking, a developer can only do so much mental processing between sleep cycles.
That’s not to say it’s always bad to learn new things. In fact one has to in order to keep the system working in a changing world.
But throwing shade at developers who hesitate to learn new things is foolish. I’d recommend every developer do shamatha and vipassana meditation so that they can more accurately monitor the state of their own mental resources. Those mental resources are the most valuable and most expensive resources on the project.
Good that you’ve enjoyed it. But a fundamentally wrong thing about systemd is that it is actively harming the best thing about Linux – freedom. Some programs won’t work on a non-systemd distro because how tightly coupled and vendor non-agnostic anything that becomes dependent on might become at times. Of course it’s not as bad as glib(loat)c, but still if something can be done without any degradation of functionality via standard POSIX facilities, WHY either incur additional maintenance overhead for non-systemd implementations or punish people for their computing choices if there’s no one to maintain it?
I don’t hate systemd. However:
Units and service files are confusing, and the documentation could be a lot better.
That said, when systemd came out the traditional init stack was largely abandoned. Thanks to systemd (and the hatred of it) there are now a couple of traditional-style init systems in active development.
I don’t hate it now, though I did when it first came out, as it borked my system on several occasions. I’m still not a fan, but it works so eh.
One borkage was that the behavior of fstab changed, so if there was e.g. a USB drive in fstab which was not connected at startup, the system would refuse to boot without some (previously not required) flags in fstab. This is not a big deal for a personal laptop, but for my headless server, was a real pain. The systemd behavior is arguably the right one, but it broke systems in the process. Which is somewhat antithetical to, say, Linus Torvalds’ approach to kernel development (“do not break user space”).
It also changed the default behavior of halt — now, it changed it to the “correct” behavior, but again…it broke/adversely affected existing usage patterns, even if it was ultimately in the right.
In addition to all of this, binary logs are very un-UNIXy, and the monolithic/do-everything model feels more like Windows than *NIX.
systemd tries to unify a Wild West situation where everyone, their crazy uncle, and their shotgun-dual-wielding Grandma has a different set of boot-time scripts. Instead of custom 200-line shell scripts now you have a standard simple syntax that takes 5 minutes to learn.
Downside is now certain complicated stuff that was 1 line need multiple files worth of workarounds to work. Additionally, any custom scripts need to be rewritten as a systemd service (assuming you don’t use the compat mode).
People are angry that it’s not the same as before and they need to rewrite any custom tweaks they have. It’s like learning to drive manual for years, wonder why the heck there is a need for auto, then realizing nobody is producing manual cars anymore.
There is also the argument that it’s more complicated under the hood and harder to troubleshoot, particularly because of it’s inherent parallelism and dependency-tree design, whereas initv was inherently serial. It was much more straightforward to pick the order in which services started and shut down on an initv system.
For example, say I write a service and I want it to always be the first service stopped during a shutdown, and I want all other services to wait for it to stop before shutting down. That was trivial to do on an initv system, it’s basically impossible on systemd.
For those wondering, yes I did run into this situation. My solution was clobbering the shutdown, poweroff, and restart binaries with scripts earlier in path search that stop my service, verify that they’re stopped, and then hook back to systemd to do the power event.
I had numerous situations where systemd didn’t let me abort a hanging service startup during boot or stop during shutdown.
So what do I do now, systemd? Wait till infinity??
That never happened while using other init systems. Because they simply fail properly (“sorry I did my best to stop this, I needed a SIGKILL finally”). Or simply let me log in: “sorry, some services failed to start and now it’s a huge mess, but at least you can log in and fix it.”.
