January 2018
Intermediate to advanced
456 pages
12h 49m
English
Content preview from Embedded Linux Development Using Yocto Project Cookbook - Second Edition
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Getting ready
systemd is based on the concepts of units, an abstraction of all elements that are relevant for system startup and maintenance, and targets, which group units and can be viewed as a runlevel equivalent. Some of the units systemd defines are:
- Services
- Sockets
- Devices
- Mount points
- Snapshots
- Timers
- Paths
The default targets and their runlevel equivalents are defined in the following table:
|
sysvinit |
Runlevel |
systemd target |
Notes |
|
0 |
runlevel0.target |
poweroff.target |
Halt the system. |
|
1, s, single |
runlevel1.target |
rescue.target |
Single user mode. |
|
2, 4 |
runlevel2.target, runlevel4.target |
multi-user.target |
User-defined/site-specific runlevels. By default, identical to 3. |
|
3 |
runlevel3.target ... |
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