Linux › Section F · How user space starts › Topic F.4
System V runlevels and init
Before systemd, most Linux systems booted with System V init: numbered runlevels, a configuration file called inittab and directories of start and stop scripts. It is legacy now, but you will still meet it on old servers, embedded devices and in a lot of documentation.
In this topic
- Why study a legacy init
- Runlevels
- /etc/inittab
- Worked example: reading inittab lines
- rc scripts and the link farm
- Worked example: a runlevel 3 boot
- Managing services and runlevels
- run-parts
- SysV compatibility in systemd
- Common mistakes to avoid
- Key takeaways
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