[SOLVED] first file which is executed when we reboot or shutdown Linux server

vikas027 · 08-17-2009, 11:36 AM

Hi All,

I am using RHEL 5.2. I wanted to know which file is executed at first when we shutdown or reboot Linux machine.

Actually, I have made a small script to start/stop an application.

To start it I can put start script into /etc/rc.d/rc.local

BUT I do not know where to put the stop script, so that it executes just in the starting of reboot or shutdown process.

Any idea, I have tried using K* scripts in /etc/rc0.d/ and /etc/rc6.d/ BUT I am looking for other options.

unSpawn · 08-17-2009, 12:16 PM

Quote:

Originally Posted by vikas027

I have tried using K* scripts in /etc/rc0.d/ and /etc/rc6.d/ BUT I am looking for other options.

Maybe explain what your script is all about and why symlinking in /etc/rc0.d/ and /etc/rc6.d/ won't do?

vikas027 · 08-17-2009, 12:41 PM

Quote:

Originally Posted by unSpawn

Maybe explain what your script is all about and why symlinking in /etc/rc0.d/ and /etc/rc6.d/ won't do?

Hi Unspawn,

Yes, symlinking scripts should work BUT I was following this url. Here, it is written

Quote:

# ln -s /etc/init.d/dbora /etc/rc.d/rc0.d/K01dbora
# ln -s /etc/init.d/dbora /etc/rc.d/rc3.d/S99dbora
# ln -s /etc/init.d/dbora /etc/rc.d/rc5.d/S99dbora

The commands themselves work, I can see the links created, but my Oracle instance never seems to startup or shutdown properly.

Thus, I was trying it to start/stop Oracle at startup/shutdown by two ways:-
1) Through chkconfig which eventually makes S* and K* are soft links only.
I have also posted this link in "Linux General" forum.
2) Also, I was looking for other way round like to put a script when machines is just about to go off. I am sure there must be a way.

Learning is my motive

. I want to learn it both ways, through chkconfig method as well as put a script/command in a system file which executes just in the starting of reboot or shutdown process.

unSpawn · 08-17-2009, 01:09 PM

That makes this thread half crosspost and half not. Wrt symlinks SysV init works like that so if you've got problems with your init scripts I suggest you fix those first before trying to find workarounds that conflict with doing things the RHEL way.

vikas027 · 08-17-2009, 01:20 PM

Quote:

Originally Posted by unSpawn

That makes this thread half crosspost and half not. Wrt symlinks SysV init works like that so if you've got problems with your init scripts I suggest you fix those first before trying to find workarounds that conflict with doing things the RHEL way.

No, I do not have problem with any of my /etc/rc*.d/S* or /etc/rc*.d/K* scripts. These are working perfectly. Please have a look on my other post
http://www.linuxquestions.org/questi...init.d-748056/

But, still just for sake of knowledge I looking for something similar to /etc/rc.d/rc.local for reboot & shutdown.

unSpawn · 08-17-2009, 04:09 PM

Quote:

Originally Posted by vikas027

But, still just for sake of knowledge I looking for something similar to /etc/rc.d/rc.local for reboot & shutdown.

OK. What application does 'shutdown' send a signal to on shutdown? Which configuration file does that other process use by default to handle runlevel changes? Would it be possible to add another line that could drive a process on entering runlevel 6?

vikas027 · 08-18-2009, 12:23 AM

Quote:

Originally Posted by unSpawn

OK. What application does 'shutdown' send a signal to on shutdown? Which configuration file does that other process use by default to handle runlevel changes? Would it be possible to add another line that could drive a process on entering runlevel 6?

hey, so many questions.

I did not knew my query would drive so many questions in turn !

vikas027 · 08-19-2009, 01:45 PM

Anybody can please help me out to find the first script (if exists) in shutdown or reboot process. I have googled a lot but could not find anything.

Pls Help !!

unSpawn · 08-19-2009, 01:54 PM

What application does 'shutdown' send a signal to on shutdown?
init of course.

Which configuration file does that other process use by default to handle runlevel changes?
/etc/inittab.

Would it be possible to add another line that could drive a process on entering runlevel 6?
Sure, why not?

vikas027 · 08-19-2009, 10:06 PM

Quote:

Originally Posted by unSpawn

What application does 'shutdown' send a signal to on shutdown?
init of course.

Which configuration file does that other process use by default to handle runlevel changes?
/etc/inittab.

Would it be possible to add another line that could drive a process on entering runlevel 6?
Sure, why not?

Thanks a ton unSpawn. I willl try it and get back to you. Sorry, this did not clicked on my mind. Will try it and update you with the results.

unSpawn · 08-20-2009, 06:18 AM

Quote:

Originally Posted by vikas027

this did not clicked on my mind. Will try it and update you with the results.

True, but it does make me wonder how you can have a RHCE and be a "linux administrator" without knowing the most basic of basics (or how to find out for for yourself for that matter)...

vikas027 · 08-21-2009, 09:25 AM

Quote:

Originally Posted by unSpawn

True, but it does make me wonder how you can have a RHCE and be a "linux administrator" without knowing the most basic of basics (or how to find out for for yourself for that matter)...

It is my fault. I did not read your questions properly. I should have been more attentive to them.

unSpawn · 08-21-2009, 09:43 AM

NP, happens to me too sometimes. Anyway, did you figure out how to make this work?

vikas027 · 08-22-2009, 06:14 AM

Quote:

Originally Posted by unSpawn

NP, happens to me too sometimes. Anyway, did you figure out how to make this work?

Thanks unSpawn,

Well I got some good learning too reviewing /etc/inittab. I must admit, I did not paid required attention this file needed. Rather, till now I did not felt the need.

This worked out for me. I can modify the below lines of /etc/rc.d/rc

Code:

# First, run the KILL scripts.
for i in /etc/rc$runlevel.d/K* ; do
        check_runlevel "$i" || continue

        # Check if the subsystem is already up.
        subsys=${i#/etc/rc$runlevel.d/K??}
        [ -f /var/lock/subsys/$subsys -o -f /var/lock/subsys/$subsys.init ] \
                || continue

        # Bring the subsystem down.
        if egrep -q "(killproc |action )" $i ; then
                $i stop
        else
                action $"Stopping $subsys: " $i stop
        fi
done

as here

Code:

# First, run the KILL scripts.
for i in /etc/rc$runlevel.d/K* ; do
        check_runlevel "$i" || continue

if [ $runlevel -eq 0 ] || [ $runlevel -eq 6 ]; 
then 
my script or my commands
fi

        # Check if the subsystem is already up.
        subsys=${i#/etc/rc$runlevel.d/K??}
        [ -f /var/lock/subsys/$subsys -o -f /var/lock/subsys/$subsys.init ] \
                || continue

        # Bring the subsystem down.
        if egrep -q "(killproc |action )" $i ; then
                $i stop
        else
                action $"Stopping $subsys: " $i stop
        fi
done

I believe this should work. Thanks a ton for your patience and time.