SystemD unit customization

What is the best, most correct way to customize SystemD unit files that come from packages?

Packages will leave their files in /usr/lib/systemd/system . I used to just copy those files into /etc/systemd/system and edit them as needed. But is this the best way?

Yes! You can create override files! If you create a directory like /etc/systemd/system/some-unit.service.d and create files named *.conf in there they will also be ready by SystemD (after a systemctl daemon-reload)

One trick is that to override some things like ExecStart= you need to first declare an empty one to reset it if the Type= isn’t oneshot.

[Service]
ExecStart=
ExecStart=/usr/sbin/httpd $OPTIONS -DFOREGROUND

You can also use systemctl edit some-unit.service to create and edit the file in one go. This will create override.conf for you, so that’s probably a best bet for naming any override files you might create.

I learned this from this excellent answer on AskUbuntu.

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