init.d scripts for shutdown and reboot

[Tommy Trussell]

amendment -- don't do this at a console WINDOW -- go to a virtual
console by pressing Ctrl-Alt F1

On Thu, Dec 11, 2008 at 9:13 AM, Tommy Trussell
<tommy.trussell at gmail.com> wrote:
> On Thu, Dec 11, 2008 at 8:40 AM, Kailesh Mussai <kmussa at cs.mcgill.ca> wrote:
>> On Thu, Dec 11, 2008 at 12:28:22AM -0000, Cameron Hutchison wrote:
>>
>>> Kailesh Mussai <kmussa at cs.mcgill.ca> writes:
>>>
>>> >I am trying to understand how ubuntu does a shutdown.  From what I
>>> >understand in the rc0.d, here is a part of ls -l:
>>>
>>> >root at turkana:/etc/rc0.d# ls -l
>>>
>>> >lrwxrwxrwx 1 root root  13 2008-10-10 11:45 K01gdm -> ../init.d/gdm
>>> >---snip----
>>> >lrwxrwxrwx 1 root root  22 2008-10-10 11:45 S31umountnfs.sh -> ../init.d/umountnfs.sh
>>> >lrwxrwxrwx 1 root root  17 2008-10-14 10:30 S32portmap -> ../init.d/portmap
>>> >lrwxrwxrwx 1 root root  20 2008-10-10 11:45 S35networking -> ../init.d/networking
>>> >lrwxrwxrwx 1 root root  18 2008-10-10 11:45 S40umountfs -> ../init.d/umountfs
>>> >lrwxrwxrwx 1 root root  20 2008-10-10 11:45 S60umountroot -> ../init.d/umountroot
>>> >lrwxrwxrwx 1 root root  14 2008-10-10 11:45 S90halt -> ../init.d/halt
>>>
>>> >The init scripts umountnfs.sh, umountfs, umountroot do nothing when
>>> >started but only when stopped, an example is:
>>>
>>> >root at turkana:/etc/rc0.d# /etc/init.d/umountfs start # No-op
>>>
>>> >The reason I am asking is,
>>>
>>> I'm not sure what you're asking, as there is no question in your
>>> message.
>>>
>>> It may help you to know that in runlevels 0 and 6, the S* scripts are
>>> run with the "stop" argument. In the other runlevels, the S* scripts are
>>> run with the "start" argument. For all runlevels, K* scripts are run
>>> with the "stop" argument.
>>>
>>>
>>> --
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>>> ubuntu-users at lists.ubuntu.com
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>> +-------------------
>>
>> Thank you Cameron, that does help me understand why they would have the
>> init.d/umount* as S* scripts in runlevel 0 and 6.
>>
>> I am trying to understand the shutdown process, as our own custom setup
>> is failing to umount the local drive giving us "resource is busy" before
>> shutting down.
>>
>> Hence my question is how does the shutdown process works, especially the
>> part where the unmounting is concerned?
>>
>> Best,
>> Kailesh
>
> If you have a test or non-production system with the hardware you are
> looking at, how about opening a console window and playing around with
> it?
>
> You could add some diagnostic messages to some of the scripts if
> you're not sure they're being called, and watch for your messages to
> appear when you change runlevels.
>
> One way to change your runlevels is using the telinit command
>
> to go to runlevel 3
>
> # telinit 3
>
> or to go to runlevel 0
>
> # telinit 0
>
> BY THE WAY -- the # means a root prompt. You can get there by
> activating root OR by using any of the several sudo tricks to imitate
> it. (or you can prepend "sudo" to any of the lines above)
>