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Re: /dev/pty always gone [message #26217 is a reply to message #26193]

Thu, 17 January 2008 13:21

maratrus
Messages: 1495
Registered: August 2007
Location: Moscow

Senior Member

Hi,

As far as I understand the matter is in the following:

When your VPS booting, one of the init scripts inside VE calls /sbin/start_udev which mounts /dev directory on tmpfs

mount -n -o mode=0755 -t tmpfs none "$udev_root"

So the directory /vz/private/<VE_ID>/dev and /vz/root/<VE_ID>/dev becomes different.
Then start_udev creates additional nodes.
When you create necessary devices like ptmx or ptyp0 (with MAKEDEV) they of course appear in /dev but start_udev mounts /dev on tmpfs so on reboot we lost this files.

P.S. In your case I suppose that after update udev package was installed and it becomes the reason of the problem.
P.S.S. You can conduct such experiment. After your VPS was started enter it. We already see that "mount" command shows such strings

Quote:

# mount
simfs on / type simfs (rw)
/proc on /proc type proc (rw)
/sys on /sys type sysfs (rw)
none on /dev type tmpfs (rw)
none on /dev/pts type devpts (rw)

Let's try to umount /dev/

umount -l /dev

. Then I suppose in /dev we can observe the same like in /vz/private/<VE_ID>/dev/. Then we can try to go out from VE and enter it again. If you create something in /dev it will be persistent and you can find it after reboot and after umount /dev.

By the way you have mentioned that sometimes ptmx sometimes ptyp0 were failed. What does it mean? Sometimes ptmx was in /dev sometimes there was not such file in /dev?

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[Message index]

		/dev/pty always gone By: Thomasd on Tue, 15 January 2008 00:46
		Re: /dev/pty always gone By: vaverin on Tue, 15 January 2008 05:36
		Re: /dev/pty always gone By: Thomasd on Tue, 15 January 2008 19:22
		Re: /dev/pty always gone By: maratrus on Wed, 16 January 2008 07:34
		Re: /dev/pty always gone By: Thomasd on Wed, 16 January 2008 08:13
		Re: /dev/pty always gone By: maratrus on Wed, 16 January 2008 12:15
		Re: /dev/pty always gone By: Thomasd on Wed, 16 January 2008 18:39
		Re: /dev/pty always gone By: maratrus on Wed, 16 January 2008 21:09
		Re: /dev/pty always gone By: Thomasd on Wed, 16 January 2008 23:55
		Re: /dev/pty always gone By: maratrus on Thu, 17 January 2008 13:21
		Re: /dev/pty always gone By: Thomasd on Thu, 17 January 2008 19:39
		Re: /dev/pty always gone By: maratrus on Fri, 18 January 2008 10:31
		Re: /dev/pty always gone By: Thomasd on Fri, 18 January 2008 19:04
		Re: /dev/pty always gone [SOLUTION] By: asstronaut on Mon, 28 January 2008 00:09
		Re: /dev/pty always gone [SOLUTION] By: maratrus on Mon, 28 January 2008 16:22

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