Re: Are /dev objects required for clean shutdown?

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Hi Pascal,

from my experience copying Linux (Debian) installations,
you statically need /dev/console and /dev/null, everything
else will be created automatically. The static device files
will canish when the devfs is mounted on /dev/ and recreated
as well. But they seem to be needed before that happens
or booting hangs.

For Debian, these can be generated with (after umounting the
dev-fs or from a resuce system):

   cd /dev 
   mknod -m 660 console c 5 1
   mknod -m 660 null c 1 3

Incidentally, cryptsetup should not need a clean shutdown,
but the filesystem in there may like one. Although Linux
filesystems are generally very tolerant of surprising
shutdowns. Probably an effect of PC hardware historically
not being very reliable.

Regards,
Arno

On Tue, Feb 06, 2018 at 16:48:06 CET, Pascal wrote:
> /dev on my CentOS 7 box took a 'rm -rf' yesterday, wiping out most of it.
> Easiest way to recover is to reboot (/dev is on a ramdrive and created from
> scratch during boot), but I'm worried about not getting a clean shutdown.
> Does cryptsetup need anything in /dev to shutdown cleanly?  If so, how do I
> recreate the devices?  The complete list of what is missing from /dev is
> huge, but the below all seem to be disk related and are all gone now:
> 
> /dev/dm-0
> /dev/dm-1
> /dev/dm-2
> /dev/sdb
> /dev/sdc
> /dev/sdd
> /dev/sg0
> /dev/sg1
> /dev/sg2
> /dev/mapper/luks-27bc6c3f-3479-4c65-b2f8-17d35081bbf4
> /dev/mapper/luks-2f41b83f-925d-42f0-aca2-b91b1c6265b0
> /dev/mapper/luks-68f22741-5399-41e5-b40b-81230cb51b27
> _______________________________________________
> dm-crypt mailing list
> dm-crypt@xxxxxxxx
> http://www.saout.de/mailman/listinfo/dm-crypt

-- 
Arno Wagner,     Dr. sc. techn., Dipl. Inform.,    Email: arno@xxxxxxxxxxx
GnuPG: ID: CB5D9718  FP: 12D6 C03B 1B30 33BB 13CF  B774 E35C 5FA1 CB5D 9718
----
A good decision is based on knowledge and not on numbers. -- Plato

If it's in the news, don't worry about it.  The very definition of 
"news" is "something that hardly ever happens." -- Bruce Schneier
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