How to change the run level from 6 in Centos 5.4

naveenjoshi19 · 03-26-2015, 06:11 AM

1 )How to change the run level from 6 to 3 or any run level in Centos 5.4 ?
2)I want to learn more about run level 4 (I know it is used to make changes in the boot time )?

linosaurusroot · 03-26-2015, 06:20 AM

If Centos 5.4 has /etc/inittab that's where I'd look first.

John VV · 03-26-2015, 06:02 PM

there is no 6

and 4 is used on Debian os's and NOT on redhat rpm os's

you make the change on old redhat systems the Same way you do on OLD debian systems

edit the old legacy grub.conf or inittab
or
the kernel line during early boot

Kustom42 · 03-26-2015, 06:37 PM

Quote:

Originally Posted by John VV

there is no 6

This is incorrect, runlevel 6 DOES exist but it is a reboot runlevel. Run init 6 as root and watch ur box reboot.

Quote:

Originally Posted by John VV

edit the old legacy grub.conf or inittab
or
the kernel line during early boot

This is correct, you would edit the /etc/inittab file for permanent runlevel changes. You can edit the boot menu via grub and pass the run level as a boot parameter. Hardcoding this into the grub.conf is not a good idea as your inittab would have a different value and thats where it should be.

Here is a default inittab:

Code:

# Default runlevel. The runlevels used are:
#   0 - halt (Do NOT set initdefault to this)
#   1 - Single user mode
#   2 - Multiuser, without NFS (The same as 3, if you do not have networking)
#   3 - Full multiuser mode
#   4 - unused
#   5 - X11
#   6 - reboot (Do NOT set initdefault to this)
#
id:3:initdefault:

Simply change the number after the first colon from 3 to whatever you want. 4 is the same as 3 by default and is a second runlevel used for advanced server configs if you need it.

naveenjoshi19 · 03-27-2015, 11:15 AM

Quote:

Originally Posted by naveenjoshi19

1 )How to change the run level from 6 to 3 or any run level in Centos 5.4 ?
2)I want to learn more about run level 4 (I know it is used to make changes in the boot time )?

Thank You for replying to my answer I got the answer