How to switch from one run level to other runleve
 

Hi Team,

I have a situation where to change the runlevel from 3 to 5 without reboot or downtime.

Earlier I heard like there is some command to switch from one runlevel to other runlevel without downtime/reboot.

Thanks in Advance.

see man init, especially "changing runlevels"

Yeah using init we can change run levels. By giving below way we can change runlevel

init 0 - > will shutdown
init 1 -> single usermode
init 3 -> textmode Run level 3
init 5 -> runlevel 5, where you get GUI
init 6 - > reboot

By using above to switch from runlevel 3 to runlevel 5 we need downtime/reboot. But in my case I cannot reboot as it is critical server.

So I am looking for command that will switch run level without downtime.

I've always used to change the runlevel (typically 3 to 5 or 5 to 3 in Fedora; doesn't do much for me when running Ubuntu).

With systemd in debian the inittab is removed so the runlevel is changed by another file, although I haven't figured out which.

To switch runlevel on the fly:
systemctl isolate multi-user.target # the equivalent of init 3
systemctl isolate graphical.target # the equivalent of init 5

To change the default runlevel:
systemctl set-default multi-user.target
systemctl set-default graphical.target

Thank you suicidaleggroll that's good to know, I haven't seen any good documentation on systemd yet. It took me 4 years to get where I am with linux & 1 update to have to relearn it

I take it the version talked about is Jessie or above? Has systemd been implemented yet in Debian?
'init 1' no longer works?

Fred.

I run both wheezy and jessie. wheezy uses sysVinit. jessie uses systemd.

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Steve Stites

Yes you are correct but the statement is relavent because the OP hasn't stated which OS he/she is using.