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Runlevel(s)

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Operating Systems Linux Runlevel(s)
# 1  
Old 09-14-2006
Error Runlevel(s)
Can some exsplain to to me what runlevel 1-9 do?

I need to know.
# 2  
Old 09-14-2006
I dunno Jimmy, can you use Google to find the answers to some of the easier questions?

The problem is that runlevels can be different depending on which unix you're looking at. Solaris for example. Run level 5 is a system power down. On Linux boxes, run level 5 brings you into the windowing system.

Some runlevels are consistent even if they're not really official standards. Run level 2 and 3 for example.

Plus some systems use rcn.d directories where others use rc scripts.

There are other run levels too.

S - Single user mode
0 - System Shutdown
1 - Single user mode
2 - Start most services
3 - Multi-user mode startup (apache, nfs server and snmp start here on solaris)
4 - ?
5 - X-Windows on linux, Powerdown on Sun
6 - ?
7 - ?
8 - ?
9 - ?

If you have a directory and have a specific need to start something extra, like a web server but you don't want it starting in 3, then you can put Apache in run level 4 for example, but not on Sun.

See in Linux, each rc directory stands on its own. init throws you right to the /etc/rc3.d directory. So all your startup scripts for run level 3 need to be in /etc/rc3.d. However on Sun systems, /etc/rc2.d is processed and then /etc/rc3.d and potentially /etc/rc4.d if you had something in there.

Did that help?

Carl
# 3  
Old 09-14-2006
Computer Helped
Quote:
Originally Posted by BOFH
I dunno Jimmy, can you use Google to find the answers to some of the easier questions?

The problem is that runlevels can be different depending on which unix you're looking at. Solaris for example. Run level 5 is a system power down. On Linux boxes, run level 5 brings you into the windowing system.

Some runlevels are consistent even if they're not really official standards. Run level 2 and 3 for example.

Plus some systems use rcn.d directories where others use rc scripts.

There are other run levels too. Smilie Smilie Smilie

S - Single user mode
0 - System Shutdown
1 - Single user mode
2 - Start most services
3 - Multi-user mode startup (apache, nfs server and snmp start here on solaris)
4 - ?
5 - X-Windows on linux, Powerdown on Sun
6 - ?
7 - ?
8 - ?
9 - ?

If you have a directory and have a specific need to start something extra, like a web server but you don't want it starting in 3, then you can put Apache in run level 4 for example, but not on Sun.

See in Linux, each rc directory stands on its own. init throws you right to the /etc/rc3.d directory. So all your startup scripts for run level 3 need to be in /etc/rc3.d. However on Sun systems, /etc/rc2.d is processed and then /etc/rc3.d and potentially /etc/rc4.d if you had something in there.

Did that help?

Carl
Yes, it did help. Thanks! Smilie
You type init (number) to change runlevel?
# 4  
Old 09-15-2006
Quote:
Originally Posted by Irish Jimmy
Yes, it did help. Thanks! Smilie
You type init (number) to change runlevel?
Yep. I think I mostly use init 5 on my sun boxes. Oh and init 6 is reboot Smilie

Carl
# 5  
Old 09-16-2006
It's not working...
How do I change the runlevel?
# 6  
Old 09-17-2006
Quote:
Originally Posted by Irish Jimmy
It's not working...
How do I change the runlevel?
You're really going to have to start being complete in your questions and responses. Let us know what you're trying to do and, if something we suggest isn't working for you, post what you did and the results. It's hard to troubleshoot when you just say "It's not working..."

Smilie

Carl
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