Linux › Section F · How user space starts › Topic F.2
systemd units and unit files
systemd describes everything it manages, from daemons to mounted filesystems, as a unit defined in a short text file. Learn to read and write those files and you can understand, change and extend how a modern Linux system starts.
In this topic
- Everything is a unit
- Where unit files live
- The anatomy of a unit file
- Worked example: a service for a small web app
- Service types and readiness
- Commands, variables and the environment
- Template units and specifiers
- Worked example: one template, many instances
- Drop-ins: changing a unit without editing it
- Common mistakes to avoid
- Key takeaways
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