Linux Bible by Christopher Negus & Christine Bresnahan
Author:Christopher Negus & Christine Bresnahan
Language: eng
Format: epub
Publisher: John Wiley & Sons
Published: 2012-08-28T16:00:00+00:00
To get more information on these configuration files and their options, enter man systemd.service, man systemd.target, and man systemd.unit at the command line.
For the Linux server using systemd init, the boot process will be easier to follow, now that you understand systemd target units. At boot, systemd activates the default.target unit. This unit is aliased to either multi-user.target or graphical.target. Thus, depending upon the alias set, the services targeted by the target unit are started. Figure 15.4 shows the systemd init's course of action in spawning the correct processes at system startup. If you are following along with the examples used in this section, the default.target is aliased to multi-user.target, as shown in Figure 15.4.
If you need more help on understanding systemd init, there is excellent documentation by its author at http://0pointer.de/blog/projects/systemd-docs.html. Also, you can enter man -k systemd at the command line to get a listing of the various systemd utilities' documentation in the man pages.
Figure 15.4 systemd init course of action at server boot
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