Le quintidi 25 germinal, an CCXXV, Greg Wooledge a écrit : > Some day there will be actual end-user-friendly systemd documentation > somewhere, consolidating all of these pieces of wisdom together. I hope.
Note: systemd is not for end-users, it is for system administrator and distribution authors. > 1) To override parts of a distribution's systemd unit locally, you MUST > use the foo.service.d/ method. You can't just put the override bits > into an /etc/systemd/system/foo.service file. That would be too easy. foo.service.d/*.conf is for overriding bits. /etc/systemd/system/foo.service is for overriding the whole file. I find that fairly natural. Otherwise, how would you override the whole file? > 2) The files inside foo.service.d/ MUST end with a .conf suffix. (Cf. > the wheezy->jessie apache2 upgrade, and having to rename every single > one of my virtual domain config files AND the symlinks to them.) After having been bitten by old *.conf~ backup files left by an editor, I must say I find that restriction quite useful. > 3) foo.service.d/ must use the CANONICAL service name of whatever it is > that you're trying to override. This may not be the same as the > Debian package name. For example, the nfs-kernel-server package > creates a systemd unit named nfs-server.service with an ALIAS of > nfs-kernel-server.service. If you try to create override files in > nfs-kernel-server.service.d/ it will not work correctly. They have > to be in nfs-server.service.d/ instead. > > Don't even get me started on sshd.service vs. ssh.service. Do you > have any idea how hard it is to notice that extra/missing "d", and > figure out why things Simply Do Not Work? On the other hand, if systemd were to read snippets of configuration with a subtly different name, someone else (or maybe be even yourself!) would have complained about wasted time because of a stale config snippet that should not have been read. I find that strict rules are usually more convenient in the long run. Note that you can use "systemctl edit" to have an editor started on the exact correct file. Regards, -- Nicolas George
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