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Systemd: Hidden Gems for a Better Linux
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this post was submitted on 10 Aug 2023
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The dependency system takes a bit to understand but compared to like upstart it was a massive improvement.
Everybody gangsta until
A start job is running for ... (10s / 1min 30s)Or, even worse,
A start job is running for ... (10s / no limit)lol, that brought back memories
I don't see how exactly that is systemd's fault.
You are blaming it for having proper dependency handling?
I'm blaming it for making it a pain in the ass to debug dependency problems and for having the confusing, non-intuitive, overly verbose and redundant syntax that probably caused the problem in the first place.
Like, who the hell can memorize all the subtle differences in behavior between
After=,Requires=,Wants=,Requisite=,BindsTo=,PartOf=,UpHolds=and then all their "reverse" equivalents?You're right that the difference isn't overly obvious. However, for most services,
Wants=is enough. I think some of these (likeRequisite=) came from actual users' demands where they had to solve corner cases in their setup that systemd did not allow with the existing features. I think especiallyUpheldBy=is a smart addition; it adds restarting to a service only if that services is used as a dependency for the one it upholds.