Shutdown/reboot options: is "init 6" acceptable?
Christopher D. Morgan
The correct method to shut down the system may depend on how you have your
start/stop scripts in /etc/init.d linked to /etc/rc?.d.
On my systems, my scripts are linked to /etc/rc3.d/S??scriptname and
/etc/rc2.d/K??scriptname. In this case, I need to execute init 2 first to
ensure that all the stop scripts are executed. Then I would issue an init
6 to perform the re-boot. Disk synching is never a bad idea ( I would
issue at least two sync commands) but the chain of events set in motion by
the init process should take care of that for you anyway.
If I were to execute an init 6, the /etc/rc2.d/K??* scripts would not be
executed and applications may therefore go down in a manor that was
unintended (think of Oracle dabases for example that typically follow a
predefined shutdown sequence as opposed to simply having their processes
terminated).
Hope this helps.
Chris
> Just a quick question about shutdown procedures. I usually do a
> manual sync;sync;sync of the disks, and then use halt to shut
> things down. Any ideas/suggestions about the various methods:
>
> 1. sync; halt
> 2. reboot
> 3. shutdown
> 4. init 6
>
> I'm particularly interested in "init 6", as the man page and FAQ don't
> shed light on whether the disks are sync'd before the OS is brought
> down. Any ideas?
>
> Thanks!
>
> Dave
> --
>
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> David S. Foster Univ. of California, San Diego
> Programmer/Analyst Brain Image Analysis Laboratory
> fos...@bial1.ucsd.edu Department of Psychiatry
> (619) 622-5892 8950 Via La Jolla Drive, Suite 2240
> La Jolla, CA 92037
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Ron Dilley
If you are at rl3, init 6 will back step you through all the previous
run levels (executing all K* scripts). The system will reboot and bring
you back to rl3.
Ron
> ------------------------------------------------------------------------
> Name: chris_morgan.vcf
> chris_morgan.vcf Type: VCard (text/x-vcard)
> Encoding: 7bit
> Description: Card for Christopher D. Morgan
--
+--------------------------------------------------------+
| Ron Dilley Sr. UNIX Network Administrator |
| ron.d...@ada.com Applied Digital Access |
+--------------------------------------------------------+
LeeNMI
>> > shed light on whether the disks are sync'd before the OS is brought
>> > down. Any ideas?
init 6 tells the system to go to the default run level as defined in
/etc/inittab. It will follow all the steps in /etc/inittab leading up to the
default which is usually run level 3. cat /etc/inittab to see what your default
is.
init 6 will sync your discs.
Anthony Mandic
>
> Christopher,
>
> If you are at rl3, init 6 will back step you through all the previous
> run levels (executing all K* scripts). The system will reboot and bring
> you back to rl3.
He may also want to be aware of the difference between run levels
2 and 3.
> "Christopher D. Morgan" wrote:
> >
> > The correct method to shut down the system may depend on how you have your
> > start/stop scripts in /etc/init.d linked to /etc/rc?.d.
> >
> > On my systems, my scripts are linked to /etc/rc3.d/S??scriptname and
> > /etc/rc2.d/K??scriptname. In this case, I need to execute init 2 first to
> > ensure that all the stop scripts are executed. Then I would issue an init
> > 6 to perform the re-boot. Disk synching is never a bad idea ( I would
> > issue at least two sync commands) but the chain of events set in motion by
> > the init process should take care of that for you anyway.
One sync is sufficent. And its done for you by the init routine.
(Watch the shutdown message sometime).
> > If I were to execute an init 6, the /etc/rc2.d/K??* scripts would not be
> > executed and applications may therefore go down in a manor that was
> > unintended (think of Oracle dabases for example that typically follow a
> > predefined shutdown sequence as opposed to simply having their processes
> > terminated).
Your Oracle start/stop scripts should be run at run level 3.
-am
mgo...@yahoo.com
Ron Dilley <ron.d...@ada.com> wrote:
> Christopher,
>
> If you are at rl3, init 6 will back step you through all the previous
> run levels (executing all K* scripts). The system will reboot and bring
> you back to rl3.
>
>
> "Christopher D. Morgan" wrote:
> >
> > David,
> >
> > start/stop scripts in /etc/init.d linked to /etc/rc?.d.
> >
> > On my systems, my scripts are linked to /etc/rc3.d/S??scriptname and
> > /etc/rc2.d/K??scriptname. In this case, I need to execute init 2 first to
> > ensure that all the stop scripts are executed. Then I would issue an init
> > 6 to perform the re-boot. Disk synching is never a bad idea ( I would
> > issue at least two sync commands) but the chain of events set in motion by
> > the init process should take care of that for you anyway.
> >
> > executed and applications may therefore go down in a manor that was
> > unintended (think of Oracle dabases for example that typically follow a
> > predefined shutdown sequence as opposed to simply having their processes
> > terminated).
> >
> >
> > Chris
> >
> > > Just a quick question about shutdown procedures. I usually do a
> > > manual sync;sync;sync of the disks, and then use halt to shut
> > > things down. Any ideas/suggestions about the various methods:
> > >
> > > 1. sync; halt
> > > 2. reboot
> > > 3. shutdown
> > > 4. init 6
> > >
> > > shed light on whether the disks are sync'd before the OS is brought
> > > down. Any ideas?
> > >
> > >
> > > Dave
> > > --
> > >
> > > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> > > David S. Foster Univ. of California, San Diego
> > > Programmer/Analyst Brain Image Analysis Laboratory
> > > fos...@bial1.ucsd.edu Department of Psychiatry
> > > (619) 622-5892 8950 Via La Jolla Drive, Suite 2240
> > > La Jolla, CA 92037
> > > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> >
> > ------------------------------------------------------------------------
> > Name: chris_morgan.vcf
> > chris_morgan.vcf Type: VCard (text/x-vcard)
> > Encoding: 7bit
> > Description: Card for Christopher D. Morgan
>
> --
> +--------------------------------------------------------+
> | Ron Dilley Sr. UNIX Network Administrator |
> | ron.d...@ada.com Applied Digital Access |
> +--------------------------------------------------------+
>
Mladen Gogala
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