June 2017
Intermediate to advanced
478 pages
13h 14m
English
Content preview from Mastering Embedded Linux Programming - Second Edition
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Units
The basic item of configuration is the unit file. Unit files are found in three different places:
- /etc/systemd/system: Local configuration
- /run/systemd/system: Runtime configuration
- /lib/systemd/system: Distribution-wide configuration
When looking for a unit, systemd searches the directories in that order, stopping as soon as it finds a match, and allowing you to override the behavior of a distribution-wide unit by placing a unit of the same name in /etc/systemd/system. You can disable a unit completely by creating a local file that is empty or linked to /dev/null.
All unit files begin with a section marked [Unit], which contains basic information and dependencies. As an example, here is the Unit section of the D-Bus service, /lib/systemd/system/dbus.service ...
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