Shulou(Shulou.com)06/02 Report--

Brief introduction to centos7 system runlevel We know that in centos6 and previous versions, the system runlevel is set and controlled through the / etc/inittab file, but in centos7, the setting of this file will not affect the system runlevel, which is also a feature that has changed a lot in centos7.

Next, let's introduce the running level of the system.

1. Run-level correspondence

Init level systemctl target

0 shutdown.target

1 emergency.target

2 rescure.target

3 multi-user.target

4 none

5 graphical.target

6 none

two。 Run level settin

1) Syntax: systemctl [command] [unit.target]

2) commands and parameters:

Command part

Get-default: get the current target

Set-default: sets the default runlevel to the specified target

Isolate: switch to the specified run level.

Unit.target section: for the run level given in section 1 above

3. Common runlevel related commands

1) systemctl

Systemctl get-default: get the current runlevel

Systemctl set-default multi-user.target: set the default runlevel to mulit-user

Systemctl isolate multi-user.target: switch the runlevel to mulit-user without rebooting the system

Systemctl isolate graphical.target: switch the runlevel to graphical mode without rebooting the system.

2) other

Runlvel: in the returned result, the first number is the previous run level, and the second number is the current run level

Init 5: switches the current runlevel to 5 (graphical mode).

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