[Lxc-users] LXC: missing /dev/pts/nn

[Gus Power]

Hi Daniel,

The rootfs directory exists and seems identical to another host I have
which is running containers fine:

> ls -alh /usr/lib/lxc/rootfs
total 4.0K
drwxr-xr-x 2 root root 120 May 28 19:56 .
drwxr-xr-x 4 root root 128 May 28 19:56 ..
-rw-r--r-- 1 root root   0 May 28 19:56 .keep_app-emulation_lxc-0
-rw-r--r-- 1 root root 205 May 28 19:56 README

> cat /usr/lib/lxc/rootfs/README
This directory must exist, even though no contents are ever placed
here. It is used to temporary mount the rootfs of lxc in a private
mount namespace only visible by the processes running in the
container.

> ls -alh /dev/console
crw------- 1 root root 5, 1 Jun  1 16:03 /dev/console

Running lxc-start under strace I see the following /dev/pt* references:
open("/dev/ptmx", O_RDWR)               = 3
statfs("/dev/pts", {f_type="DEVPTS_SUPER_MAGIC", f_bsize=4096,
f_blocks=0, f_bfree=0, f_bavail=0, f_files=0, f_ffree=0, f_fsid={0, 0},
f_namelen=255, f_frsize=4096}) = 0
stat("/dev/pts/26", {st_mode=S_IFCHR|0620, st_rdev=makedev(136, 26),
...}) = 0
stat("/dev/pts/26", {st_mode=S_IFCHR|0620, st_rdev=makedev(136, 26),
...}) = 0
open("/dev/pts/26", O_RDWR|O_NOCTTY)    = 4
open("/dev/ptmx", O_RDWR)               = 5
stat("/dev/pts/27", {st_mode=S_IFCHR|0620, st_rdev=makedev(136, 27),
...}) = 0
stat("/dev/pts/27", {st_mode=S_IFCHR|0620, st_rdev=makedev(136, 27),
...}) = 0
open("/dev/pts/27", O_RDWR|O_NOCTTY)    = 6
read(10, lxc-start: No such file or directory - failed to mount a new
instance of '/dev/pts'

Any ideas where I can go from here? (I really don't want to bounce the
host).

Thanks,

Gus.


On 06/06/11 22:37, Daniel Lezcano wrote:
> On 06/06/2011 06:14 PM, Gus Power wrote:
>> Hi,
>>
>> I've got a box with 15 lxc containers running happily. However I tried
>> to setup another container today and met with some resistance:
>>
>>        lxc-start 1307376067.433 WARN     lxc_cgroup - using deprecated
>> ns_cgroup
>>        lxc-start 1307376067.567 WARN     lxc_conf - rootfs specified but
>> no console found at '/usr/lib/lxc/rootfs/dev/console'
> 
> Did you checked this error ?   ^^^^^^^^^^^^
> 
>>        lxc-start 1307376067.568 WARN     lxc_conf - failed to mount
>> '/dev/pts/26'->'/usr/lib/lxc/rootfs/dev/tty1'
>>        lxc-start 1307376067.572 ERROR    lxc_conf - No such file or
>> directory - failed to mount a new instance of '/dev/pts'
>>        lxc-start 1307376067.572 ERROR    lxc_conf - failed to setup the
>> new pts instance
>>        lxc-start 1307376067.572 ERROR    lxc_start - failed to setup the
>> container
>>        lxc-start 1307376067.572 ERROR    lxc_sync - invalid sequence
>> number 1. expected 2
>>
>>
>>> lxc-version
>> lxc version: 0.7.4.1
>>
>>> uname -a
>> Linux hn2 2.6.38-gentoo-r6 #4 SMP Wed Jun 1 09:55:02 BST 2011 x86_64
>> Quad-Core AMD Opteron(tm) Processor 8354 AuthenticAMD GNU/Linux
>>
>> Looking in /dev/pts I see that for some reason 26 is indeed missing:
>>> ls -alh /dev/pts/
>> ...
>>
>> crw-------  1 root    root 136,  2 Jun  2 14:53 2
>> crw-------  1 root    root 136, 20 Jun  3 13:11 20
>> crw-------  1 root    tty  136, 21 Jun  3 13:11 21
>> crw-------  1 root    root 136, 22 Jun  3 13:13 22
>> crw-------  1 root    tty  136, 23 Jun  3 13:13 23
>> crw-------  1 root    root 136, 24 Jun  3 14:31 24
>> crw-------  1 root    tty  136, 25 Jun  3 14:31 25
>> crw-------  1 root    root 136, 28 Jun  3 15:09 28
>> crw-------  1 root    tty  136, 29 Jun  3 15:09 29
>> crw-------  1 root    tty  136,  3 Jun  2 14:45 3
>>
>> ...
>>
>> I'm loathed to just try and make another device node and hope for the
>> best. Can anyone shed some light on what may or may not be happening
>> here?
>>
>> Thanks!
>>
>> Gus.
>>
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