Small white production Linux boot flowchart

Small white production Linux boot flowchart (old driver do not spray, welcome to discuss and correct mistakes), thank you

References: Brother Bird's Linux private cuisine, Wikipedia.

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Note ①: Files for each run mode

[[Email protected] ~]# ll -d /usr/lib/systemd/system/runlevel*.target | cut  -c 28- May 4 17:52 /usr/lib/systemd/system/runlevel0.target ->  poweroff.target may 4 17:52 /usr/lib/systemd/system/runlevel1.target ->  rescue.target may 4 17:52 /usr/lib/systemd/system/runlevel2.target ->  multi-user.target may 4 17:52 /usr/lib/systemd/system/runlevel3.target ->  multi-user.target may 4 17:52 /usr/lib/systemd/system/runlevel4.target ->  multi-user.target may 4 17:52 /usr/lib/systemd/system/runlevel5.target ->  graphical.target may 4 17:52 /usr/lib/systemd/system/runlevel6.target ->  Reboot.target

Note ②:

[Email protected] ~]# Cat/usr/lib/systemd/system/graphical.target [Unit] Interfacedocumentation=man:systemd.special (7) Requires=multi-user.targetafter=multi-user.target Conflicts=rescue.targetwants=display-manager.service Allowisolate=yes[install]alias=default.target This means that Graphical.target must complete the multi-user.target before it can be done, and after the graphical.target, it is necessary to start display-manager.service the meaning of the line.

Note ③:

#看看系统预设要载入的unit有哪些? [[Email protected] ~]# ls /usr/lib/systemd/system/multi-user.target.wantsbrandbot.path  plymouth-quit.service systemd-logind.servicedbus.service plymouth-quit-wait.service  systemd-user-sessions.servicegetty.target systemd-ask-password-wall.path# user custom to load the unit and what? [[Email protected] ~]# ls /etc/systemd/system/multi-user.target.wantsabrt-ccpp.service  crond.service mdmonitor.service sshd.serviceabrtd.service hypervkvpd.service  Modemmanager.service sysstat.serviceabrt-oops.service hypervvssd.service networkmanager.service  tuned.serviceabrt-vmcore.service irqbalance.service postfix.service  Vmtoolsd.serviceabrt-xorg.service kdump.service remote-fs.target vsftpd2.serviceatd.service  ksm.service rngd.service vsftpd.serviceauditd.service ksmtuned.service  rsyslog.servicebackup2.timer libstoragemgmt.service Smartd.servicebackup.timer libvirtd.service sshd2.service 

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Small white production Linux boot flowchart