[Lxc-users] /dev/pts vs. ptmx - symlink?

[Daniel Lezcano]

On 10/17/2010 08:19 AM, Toens Bueker wrote:
> Hi *,
>
> I just recently stumbled upon lxc and wanted to give it a go. My
> testplatform is a maverick. As various posts on the list show, there
> is an issue with /dev/pts or /dev/ptmx:
>
> root at sokka:~# lxc-start -n testlxc
> lxc-start: No such file or directory - failed to mount a new instance of '/dev/pts'
> lxc-start: failed to setup the new pts instance
> lxc-start: failed to setup the container
> lxc-start: invalid sequence number 1. expected 2
> lxc-start: failed to spawn 'testlxc'
> lxc-start: Device or resource busy - failed to remove cgroup '/cgroup/testlxc'
>
> In order to use severeal instances of /dev/pts it was suggested that
> /dev/ptmx should be a symlink to /dev/pts/ptmx. Obviously I tried that
> - but to no avail.
>
> Here are the respective directories on host and guest (still unlinked
> on the host although I have tried that already and I didn't work):
>
> root at sokka:~# ls -la /dev/pts
> drwxr-xr-x  2 root     root      0 2009-04-09 02:33 .
> drwxr-xr-x 19 root     root   3680 2010-10-16 08:34 ..
> crw--w----  1 adtadmin tty  136, 0 2010-10-17 08:09 0
> crw-------  1 adtadmin tty  136, 1 2010-10-17 08:09 1
> c---------  1 root     root   5, 2 2010-10-16 08:34 ptmx
> root at sokka:~# ls -la /dev/ptmx
> crw-rw-rw- 1 root tty 5, 2 2010-10-17 08:10 /dev/ptmx
>
> root at sokka:/var/lib/lxc/testlxc/rootfs# ls -la dev/pts/
> drwxr-xr-x 2 root root 4096 2010-10-16 08:16 .
> drwxr-xr-x 4 root root 4096 2010-10-16 08:16 ..
> crw-rw-rw- 1 root root 5, 2 2010-10-16 08:03 ptmx
> root at sokka:/var/lib/lxc/testlxc/rootfs# ls -la dev/ptmx
> lrwxrwxrwx 1 root root 8 2010-10-16 08:16 dev/ptmx ->  pts/ptmx
>
> Could somebody please post his or her solution? How should the link
> (permissions, etc.) look like? Should it be on host or guest or both?
>
> Any hint is appreciated.
>    

What is the lxc configuration file ? and the lxc version ?
Can you give a try with lxc-checkconfig and look if the "Multiple 
/dev/pts instances" is enabled ?

Thanks
   -- Daniel