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

Gus Power gus at energizedwork.com
Tue Jun 14 14:44:15 UTC 2011 

Something has changed in the amd64 stage3 gentoo that breaks
lxc/lxc-gentoo. I reverted to an old stage3 (in /var/cache/lxc/gentoo)
on the host - stage3-amd64-20110428.tar.bz2 - and am able to create new
containers again.

If anyone could shed any light on what might have caused the breakage
that would be really useful!

G

On 14/06/11 15:30, panca sorin wrote:
> Same problem here, on at least two of my hardware nodes.
> 
> Both, the nodes and the containers, run Gentoo on x86_64. Versions: lxc-0.7.4.1-r1, kernel 2.6.38-gentoo-r4 (gentoo-sources).
> 
> 
> On the same hardware nodes there are other containers already started, which run just fine. The HN (hardware node) I just tried to start the container on has about 7 days of uptime during which the other container ran non-stop. (Unfortunatly, I can't restart the HN yet, but as soon as I do, I'll try to start my container and come back here with results.)
> 
> 
> host1 ~ # lxc-start -n container1
> lxc-start: No such file or directory - failed to mount 'none' on '/usr/lib/lxc/rootfs//dev/pts'
> lxc-start: failed to setup the mounts for 'container1'
> lxc-start: failed to setup the container
> lxc-start: invalid sequence number 1. expected 2
> lxc-start: failed to spawn 'container1'
> 
> host1 ~ # lxc-info -n container0
> 'container0' is RUNNING
> 
> 
> host1 ~ # ls -al /usr/lib/lxc/rootfs/
> total 4
> drwxr-xr-x 2 root root 120 May 10 04:41 .
> drwxr-xr-x 4 root root 128 May 10 04:41 ..
> -rw-r--r-- 1 root root   0 May 10 04:41 .keep_app-emulation_lxc-0
> -rw-r--r-- 1 root root 205 May 10 04:41 README
> 
> 
> container1.conf:
> 
> lxc.utsname = container1
> lxc.network.type = veth
> lxc.network.flags = up
> lxc.network.link = br0
> lxc.network.name = eth0
> lxc.network.hwaddress = ac:de:48:47:3d:6f
> lxc.network.vlan.id = 11
> lxc.mount = /etc/lxc/container1.fstab
> lxc.rootfs = /var/lib/lxc/container1
> lxc.tty = 10
> lxc.cgroup.cpuset.cpus = 0-23
> lxc.cgroup.cpu.shares = 512
> 
> container1.fstab:
> 
> none /local/var/lib/lxc/container1/dev/pts devpts defaults 0 0
> none /local/var/lib/lxc/container1/proc proc defaults 0 0
> none /local/var/lib/lxc/container1/sys sysfs defaults 0 0
> none /local/var/lib/lxc/container1/dev/shm tmpfs defaults 0 0
> 
> 
> Here's my strace: http://pastebin.com/Ng3BJy9f
> 
> Sorin.
> 
> 
> 
> ----- Original Message -----
> From: Gus Power <gus at energizedwork.com>
> To: Daniel Lezcano <daniel.lezcano at free.fr>
> Cc: lxc-users at lists.sourceforge.net
> Sent: Wednesday, June 8, 2011 10:26 AM
> Subject: Re: [Lxc-users] LXC: missing /dev/pts/nn
> 
> Hi Daniel,
> 
> Here's the strace -f output: http://pastebin.com/raw.php?i=jWbG14Hg
> 
> The config for this node is as follows:
> 
> lxc.utsname = somenode.com
> 
> lxc.network.type = veth
> lxc.network.flags = up
> lxc.network.link = br0
> 
> lxc.rootfs = /var/lxc/somenode.com
> 
> lxc.tty = 1
> lxc.pts= 128
> 
> lxc.cap.drop = sys_module mknod mac_override sys_boot
> 
> lxc.cgroup.devices.deny = a
> lxc.cgroup.devices.allow = c 1:3 rw
> lxc.cgroup.devices.allow = c 1:5 rw
> lxc.cgroup.devices.allow = c 1:9 rw
> lxc.cgroup.devices.allow = c 1:8 r
> lxc.cgroup.devices.allow = c 136:* rw
> lxc.cgroup.devices.allow = c 5:2 rw
> lxc.cgroup.devices.allow = c 4:1 rwm
> lxc.cgroup.devices.allow = c 4:0 rwm
> lxc.cgroup.devices.allow = c 5:0 rwm
> lxc.cgroup.devices.allow = c 5:1 rwm
> 
> Thanks!
> 
> Gus.
> 
> 
> On 07/06/11 19:51, Daniel Lezcano wrote:
>> On 06/07/2011 11:17 AM, Gus Power wrote:
>>> 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.
>>
>> this rootfs is a temporary directory for pivot_root the rootfs. It is
>> internally used by lxc and should not be specified in the configuration.
>>
>> By the way, can you give the configuration file of lxc ?
>>
>>>> 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).
>>
>> Can you give the output of strace -f ?
>>
>> Thanks
>>    -- Daniel
> 
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