How do I run sshd on startup?

**cjackson0** · 12-11-2004, 07:00 PM

Hi. I'm new to the whole linux / Knoppix scene and wanted to know how I can automatically startup a ssh server after booting. I have already successfully installed to my Hard Drive. I'm using Knoppix 3.4 I think.

Thanks a bunch!
CJackson0

**Markus** · 12-11-2004, 09:28 PM

Code:

su
update-rc.d ssh defaults

You can remove it with:

Code:

update-rc.d -f ssh remove

**cjackson0** · 12-11-2004, 10:26 PM

It worked perfectly. Thanks a bunch!

So what did that do and why?

**Markus** · 12-11-2004, 10:49 PM

update-rc.d is the debian way of managing services and daemons started by the init scripts. defaults sets up services to start and stop at certain points when changing runlevels. For ssh update-rc.d ssh defaults is the same as typing: update-rc.d ssh start 20 2 3 4 5 . stop 20 0 1 6 .
man update-rc.d will give you a better explanation.
ls -l /etc/rc5.d shows you what services are started and stopped and in which order at the graphical runlevel.

**arkaine23** · 12-12-2004, 07:53 AM

You can also manually edit this stuff although update-rc.d is easier.

/etc/rc5.d is the run control directory for run level 5 (graphical boot)
There are shortcuts in there which link to startup scripts usually in /etc/init.d. They are anme beginning with a capitol S or K (s for start and k for kill) folowwed by a two-digit number. The number determines the order in which the scripts are executed, highes number goes last.

You can create new links in this folder with the ln -s command like this.

ln -s /etc/init.d/ssh /etc/rc5.d/S90ssh

other runlevels-

rc2.d is for text mode boot without networking
rc3.d is for text mode boot with networking
rc1.d is single user (maintenance) mode and generally not much is run at this run level
I think 6 is for shutdown, not too sure about 4.

**gnarvaja** · 12-12-2004, 08:05 AM

Originally Posted by arkaine23

rc2.d is for text mode boot without networking
rc3.d is for text mode boot with networking
rc1.d is single user (maintenance) mode and generally not much is run at this run level
I think 6 is for shutdown, not too sure about 4.

One of the things I always liked about Linux/Open Source is that it always is about learning. Check the /etc/inittab file for details on what each level does. It contains a lot more information. Check also the man page: man inittab, which will help you iinterpret each line.

If you are not sure what those levels are, just check the directories and a simple ls should reveal what services are started and which ones are stoped upon exit.

Once you learn to read the scripts, it is a very educating exercise.

--GN

**cjackson0** · 12-14-2004, 02:41 AM

Thanks for the help all! I might just be inquisitive enough to try and figure all this out. And then when I wreck it, I'll be re-installing but it'll be a fun ride.

**CrashedAgain** · 12-16-2004, 04:42 AM

Originally Posted by cjackson0

Thanks for the help all! I might just be inquisitive enough to try and figure all this out. And then when I wreck it, I'll be re-installing but it'll be a fun ride.

Been there, crashed that. For a good fundamental understanding of Linux, try rute: http://www.icon.co.za/~psheer/book/index.html.gz