How to create /dev/pts

How to create /dev/pts

[jimbob palmer]

Hello,

I am running Ubuntu 8.04.1 in a container (openvz).

Ubuntu uses udev, and the /dev/pts device does not exist in the container.

I can cheat, and run
 cd /dev && /sbin/MAKEDEV pty && /sbin/MAKEDEV tty
manually with a chroot, but this is a hack.

RHEL has the makedev.d directory which solves my problem quite easily.

I wondered if there is a correct way of doing this with just udev?

Thanks,

Jim

Re: How to create /dev/pts

[Alan Jenkins]

jimbob palmer wrote:

> Hello,
> 
> I am running Ubuntu 8.04.1 in a container (openvz).
> 
> Ubuntu uses udev, and the /dev/pts device does not exist in the container.
> 
> I can cheat, and run
>  cd /dev && /sbin/MAKEDEV pty && /sbin/MAKEDEV tty
> manually with a chroot, but this is a hack.
> 
> RHEL has the makedev.d directory which solves my problem quite easily.
> 
> I wondered if there is a correct way of doing this with just udev?

Normally Ubuntu uses the devpts filesystem.  The ultimate solution is for
this to be container-ized as discussed recently on LKML.  (IIRC the result
was to avoid container-specific magic and just allow multiple independent
mounts of devpts).

So I think this is an OpenVZ issue and you need to find out how OpenVZ is
supposed to work here.  My guess is your "hack" is actually the correct
solution for the time being.  You just need to add the commands to an init
script somewhere.

Alan

Re: How to create /dev/pts

[Aras Vaichas]

jimbob palmer wrote:
> Hello,
>
> I am running Ubuntu 8.04.1 in a container (openvz).
>
> Ubuntu uses udev, and the /dev/pts device does not exist in the container.
>
> I can cheat, and run
> cd /dev && /sbin/MAKEDEV pty && /sbin/MAKEDEV tty
> manually with a chroot, but this is a hack.
>
> RHEL has the makedev.d directory which solves my problem quite easily.
>
> I wondered if there is a correct way of doing this with just udev?
>
If it will help, this is the top section of my init script. I create the
pts directory.

# essential system init
mount -t tmpfs mdev /dev
mkdir /dev/pts
mount -t devpts devpts /dev/pts
mount proc
mount sys

# copy over some necessary devices
cp -a /lib/udev/devices/* /dev

where:
# ll /lib/udev/devices/
drwxr-xr-x    3 root     root         4096 Sep  1  2008 ./
drwxr-xr-x    4 root     root         4096 Aug 29  2008 ../
lrwxrwxrwx    1 root     root           11 Jul  7  2008 core -> /proc/kcore@
lrwxrwxrwx    1 root     root           13 Jul  7  2008 fd -> /proc/self/fd/
crw-rw-rw-    1 root     root       1,   3 Aug 12  2008 null
crw-rw-r--    1 root     root     108,   0 Sep  1  2008 ppp
drwxrwxrwt    2 root     root         4096 Jan  9  2006 shm/
lrwxrwxrwx    1 root     root            4 Jul  7  2008 stderr -> fd/2
lrwxrwxrwx    1 root     root            4 Jul  7  2008 stdin -> fd/0
lrwxrwxrwx    1 root     root            4 Jul  7  2008 stdout -> fd/1
crw-r--r--    1 root     root       4,  64 Aug 27  2008 ttyS0

Some of those might be unnecessary, I'm currently in the middle of an
overhaul and update of our whole distribution.

Aras

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