Systemd Unit Files

[Trevor]

Systemd unit files exist in multiple directories.  Which of these
directories has precedence?

[TM]

According to man 5 systemd.unit, they are as below from hugher to lower precedence.

/etc/systemd/system.control
/run/systemd/system.control
/run/systemd/transient
/run/systemd/generator.early
/etc/systemd/system
/run/systemd/system
/run/systemd/generator
/usr/local/lib/systemd/system
/usr/lib/systemd/system
/run/systemd/generator.late

[Trevor]

There's no more definitive response than one from a manpage!!!

Great response TM!!!

[Chetan_Tiwary_]

The configuration files from the /etc/systemd/system/ configuration directories take precedence over unit files in /usr/lib/systemd/system/  and  the run time files at /run/systemd/system has a precedence higher than the /usr one but less than the /etc ones.

[Tracy_Baker · Accepted solution]

So the order of precedence is:

1. /etc/systemd/system/
2. /run/systemd/system
3. /usr/lib/systemd/system/

I remember them in this order becasue they're alphabetical. /etc, then /run, then /usr/lib

[Trevor]

Never thought about looking in an alphabetical order.
That's a big help!

Thanks Tracy!!!

[Trevor]

Loving this! 

Thanks Chetan!!!