[dm-crypt] Are /dev objects required for clean shutdown?

Sven Eschenberg sven at eschenberg.eu
Tue Feb 6 17:43:59 CET 2018


If you have /dev on a (dev)tmpfs and are using udev for inode creation, 
you could trigger udev to recreate all you inodes.
If you use some other tool, it might have a similiar function.

Regards

-Sven

P.S.: Many tools like lvm come with functions to (re)create inodes in 
absence of a /dev inode manager.

Am 06.02.2018 um 16:48 schrieb Pascal:
> /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
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