Systemd Target và Init command trên CentOS

CHI TIẾT BÀI VIẾT

16/12/2021 5:14:46 PM | Xem: lần

1. Linux Booting Process

Power ON/Restart

🡪 BIOS/System Start

🡪 MBR Loading

🡪 GRUB Boot Loader

🡪 Kernel (Linux OS)

🡪 INIT Process (Run Levels)

🡪 User Prompt (User Commands)

2. Systemd targets in CentOS

//List target (runlevel) on your system (liệt kê các target/runlevel trên CentOS 7)

[root@itstar-centos7 Desktop]# ls /lib/systemd/system/runlevel*target –l

Run Level (CentOS 6/RHEL 6): /etc/inittab Target (CentOS 7/8 - RHEL 7/8): /etc/systemd/system/default.target
Run Level (RHEL 6)	Target (RHEL 7/8)	INIT Command	Mô tả
0	poweroff.target	init 0	Shut down system
1	rescue.target	init 1	Start in Single User Mode (for Troubleshooting/Administration Tasks)
2	multi-user.target	init 2	Multiuser Mode but without networking.
3	multi-user.target	init 3	Multiuser Mode with networking.
4	multi-user.target	init 4	Reserved/User-definable
5	graphical.target	init 5	With Graphical User Mode (GUI) as runlevel 3 + display manager.
6	reboot.target	init 6	Reboots the system