Page 61 - RHEL8 BOOK

1. To display the current runlevel of your system
[root@rhel07a ~]# systemctl get-default
or
[root@rhel07a /]# ls -al /lib/systemd/system/runlevel*
[root@rhel07a /]# cat /etc/inittab

Runlevel Systemd Description

0 poweroff.target

1 rescue.target

2 multi-user.target

3 multi-user.target

4 multi-user.target

5 graphical.target

6 reboot.target

2. change the runlevel from "graphical.target" to "multi-user.target". (Runlevel 5 to Runlevel 3).
[root@rhel07a /]# rm /etc/systemd/system/default.target
rm: remove symbolic link ‘/etc/systemd/system/default.target’? y

[root@rhel07a /]# ln -s /lib/systemd/system/runlevel3.target /etc/systemd/system/default.target

[root@rhel07a /]# systemctl get-default
runlevel3.target

3. The runlevel target can be changed by using the systemctl isolate command:
[root@localhost ~]# systemctl isolate multi-user.target

4. To view what targets are available you can issue the list-units option with the type target
[root@localhost ~]# systemctl list-units --type=target

5. Run level 3 is emulated by multi-user.target. This is done by symbolic link and can be used
interchangeably
[root@localhost ~]# systemctl isolate multi-user.target
[root@localhost ~]# systemctl isolate runlevel3.target
[root@localhost ~]# ls -l /usr/lib/systemd/system/runlevel3.target
lrwxrwxrwx 1 root root 17 Oct 18 11:41 /usr/lib/systemd/system/runlevel3.target -> multi-user.target

6. Run level 5 is emulated by graphical.target. This is also done by symbolic link and can be used
interchangeably
[root@localhost ~]# systemctl isolate graphical.target
[root@localhost ~]# systemctl isolate runlevel5.target
# ls -l /usr/lib/systemd/system/runlevel5.target

lrwxrwxrwx 1 root root 16 Oct 18 11:41 /usr/lib/systemd/system/runlevel5.target -> graphical.target

S. Pradhan
(MCA, MBA-IT, BCA, CCNA, MCSA 2012, RHCE, ETHICAL HACKING)
Email Id:-spradhan.iiht@gmail.com
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