"CentOS 7.1" boot operation mode run level

In most Linux distributions, there are typically 8 runlevel

Runlevel System State
0 Halt the system
1 Single user mode
2 Basic Multi user mode
3 Multi User mode
5 Multi User mode with GUI
6 Reboot The system
s, s single user mode

Can be viewed in file/etc/inittab

[Email protected] ~]# Cat/etc/inittab

-bash:cat/etc/inittab: No file or directory

[Email protected] ~]# Cat/etc/inittab

# Inittab is no longer used when using SYSTEMD.

#

# ADDING CONFIGURATION here'll has NO EFFECT on YOUR SYSTEM.

#

# Ctrl-alt-delete is handled By/usr/lib/systemd/system/ctrl-alt-del.target

#

# SYSTEMD uses ' targets ' instead of runlevels. By default, there is both main targets:

#

# Multi-user.target:analogous to RunLevel 3

# graphical.target:analogous to RunLevel 5

#

# to view current default target, run:

# Systemctl Get-default

#

# to set a default target, run:

# Systemctl Set-default Target.target

#

Get-default

[Email protected] ~]# Systemctl Get-default

Graphical.target

Set-default

[Email protected] ~]# Systemctl set-default multi-user.target

RM '/etc/systemd/system/default.target '

Ln-s '/usr/lib/systemd/system/multi-user.target '/etc/systemd/system/default.target '

[Email protected] ~]# Systemctl Get-default

Multi-user.target

[Email protected] ~]#

"CentOS 7.1" boot operation mode run level