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Using systemd-networkd vs ifupdown on Debian (kbin.social)

submitted 1 year ago by dr_robot@kbin.social to c/selfhosted@lemmy.world

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Does anybody have experience with both systems enough to compare them?

I'm currently using ifupdown on my Debian server as that's the default, but it seems that the modern way of managing the local network is via systemd-networkd so I'm contemplating putting the effort in to migrate.

Would those of you who have experience with it, recommend it?

In my short investigation, I have made the following observations:

using networkd means you can use networkctl to manually control the interfaces which is quite convenient
networkd aims to be fully declarative
networkd separates the creation of virtual interfaces (netdev files) from their configuration (network files)
networkd doesn't support all networking features (e.g. namespaces)
networkd is systemd, but surprisingly I can't find information on how to create other unit files that depend on the individual network files going up or down, other than networkd-dispatcher. I don't like dispatcher because just like ifupdown it triggers all the scripts and you need if tests to exclude all interfaces you don't need to be affected. I'd like to write unit files that can be targeted to activate and deactivate when a particular interface goes up or down.
networkd, other than via dispatcher, does not seem to support adding arbitrary commands to run like ifupdown supports via e.g. pre-down, post-up, etc.

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[–] TheInsane42@lemmy.world 1 points 1 year ago

If you apply what is written at https://www.freedesktop.org/wiki/Software/systemd/NetworkTarget/#cutthecraphowdoimakesurethatmyservicestartsafterthenetworkisreallyonline it will work.

Then I'll need to do a global rewrite of all distrubution delivered service files and replace network.target with network-online.target. Then I don't understand why maintainers all keep using network.target. For every service that needs some kund of netwirj active I alkready have iverrides to link then to the virtual or physical interfaces they actually use.

Systemd-networkd has a learning curve, once you learn it you’ll find it superior and more flexible than anything else.

I still find it a solution desperately looking for a problem to solve. Yes, you can control loads of dependencies, but you could already do that with the init scripts. The main selling point on introduction was 'it is faster'. Why would you want something faster when you use it once every kernel update? When you design your solutions correctly (redundant), you won't even notice a reboot of 1 system in the setup.