[Lxc-users] Can not start containers using latest tools from the git

Fri Jan 22 15:26:20 UTC 2010

John Drescher wrote:
> On Fri, Jan 22, 2010 at 8:59 AM, Daniel Lezcano <daniel.lezcano at free.fr> wrote:
>   
>> John Drescher wrote:
>>     
>>>> Gah ! ok, the last request : can you launch the container with the
>>>> following
>>>> command line ?
>>>>
>>>>  lxc-start -n guest_1 -l DEBUG -o $(tty)
>>>> and give the output.
>>>>
>>>>         
>> Thanks for sending the output.
>>
>> [ ... ]
>>
>>     
>>>> Is it possible the /dev/shm was mounted at the boot time on the initrd
>>>> disk
>>>> ?
>>>>         
>>> On the host yes that is possible. I believe it would be easy to remove
>>> the initrd on this machine since it's pretty scaled down being that it
>>> runs inside of virtualbox.
>>>       
>> A did a change and commited it in the git tree. I think you should be able
>> to start the container now. If it's the case I would be interested to see
>> the log output with the fix.
>>
>>     
>
> Still did not start. BTW, I disabled the initrd on the host however I
> did see a line during the host boot
> mounting /dev/shm it is possible that openrc (new gentoo init system)
> is mounting /dev/shm in the guest
> as well. I can probably disable this after I find out what entry is
> causing that.
>
> localhost ~ #   lxc-start -n guest_1 -l DEBUG -o $(tty)
>       lxc-start 1264151162.397 INFO     lxc_conf - tty's configured
>       lxc-start 1264151162.397 DEBUG    lxc_start - sigchild handler set
>       lxc-start 1264151162.397 INFO     lxc_start - 'guest_1' is initialized
>       lxc-start 1264151162.400 DEBUG    lxc_conf - instanciated veth
> 'vethSCsXtA/vethuC7t3w', index is '10'
>       lxc-start 1264151162.447 DEBUG    lxc_cgroup - using cgroup
> mounted at '/cgroup'
>       lxc-start 1264151162.448 DEBUG    lxc_cgroup - '/cgroup/8422'
> renamed to '/cgroup/guest_1'
>       lxc-start 1264151162.503 DEBUG    lxc_conf - move 'br0' to '8422'
>       lxc-start 1264151162.503 INFO     lxc_conf - 'guest_1' hostname
> has been setup
>       lxc-start 1264151162.506 DEBUG    lxc_conf - 'veth0' has been setup
>       lxc-start 1264151162.506 INFO     lxc_conf - network has been setup
>       lxc-start 1264151162.506 DEBUG    lxc_cgroup - using cgroup
> mounted at '/cgroup'
>       lxc-start 1264151162.507 DEBUG    lxc_conf - cgroup
> 'devices.deny' set to 'a # Deny all access to devices'
>       lxc-start 1264151162.507 DEBUG    lxc_conf - cgroup
> 'devices.allow' set to 'c 1:3 rwm # dev/null'
>       lxc-start 1264151162.507 DEBUG    lxc_conf - cgroup
> 'devices.allow' set to 'c 1:5 rwm # dev/zero'
>       lxc-start 1264151162.507 DEBUG    lxc_conf - cgroup
> 'devices.allow' set to 'c 5:1 rwm # dev/console'
>       lxc-start 1264151162.507 DEBUG    lxc_conf - cgroup
> 'devices.allow' set to 'c 5:0 rwm # dev/tty'
>       lxc-start 1264151162.507 DEBUG    lxc_conf - cgroup
> 'devices.allow' set to 'c 4:0 rwm # dev/tty0'
>       lxc-start 1264151162.507 DEBUG    lxc_conf - cgroup
> 'devices.allow' set to 'c 4:1 rwm # dev/tty1'
>       lxc-start 1264151162.507 DEBUG    lxc_conf - cgroup
> 'devices.allow' set to 'c 4:2 rwm # dev/tty2'
>       lxc-start 1264151162.507 DEBUG    lxc_conf - cgroup
> 'devices.allow' set to 'c 1:9 rwm # dev/urandon'
>       lxc-start 1264151162.507 DEBUG    lxc_conf - cgroup
> 'devices.allow' set to 'c 1:8 rwm # dev/random'
>       lxc-start 1264151162.507 DEBUG    lxc_conf - cgroup
> 'devices.allow' set to 'c 136:* rwm # dev/pts/*'
>       lxc-start 1264151162.507 DEBUG    lxc_conf - cgroup
> 'devices.allow' set to 'c 5:2 rwm # dev/pts/ptmx'
>       lxc-start 1264151162.507 DEBUG    lxc_conf - cgroup
> 'devices.allow' set to 'c 254:0 rwm'
>       lxc-start 1264151162.507 INFO     lxc_conf - cgroup has been setup
>       lxc-start 1264151162.507 DEBUG    lxc_conf - mounted none on
> /lxc/guest_1/dev/pts, type devpts
>       lxc-start 1264151162.507 DEBUG    lxc_conf - mounted none on
> /lxc/guest_1/dev/shm, type tmpfs
>   
The container mounts /dev/shm ...

>       lxc-start 1264151162.507 DEBUG    lxc_conf - mounted
> /usr/portage on /lxc/guest_1/usr/portage, type none
>       lxc-start 1264151162.507 INFO     lxc_conf - mount points have been setup
>       lxc-start 1264151162.507 INFO     lxc_conf - mount points have been setup
>       lxc-start 1264151162.507 INFO     lxc_conf - console
> '/dev/pts/0' mounted to '/lxc/guest_1/dev/console'
>       lxc-start 1264151162.507 INFO     lxc_conf - 4 tty(s) has been setup
>       lxc-start 1264151162.508 DEBUG    lxc_conf - temporary
> mountpoint for old rootfs is './lxc-oldrootfs-WIzwQn'
>       lxc-start 1264151162.508 DEBUG    lxc_conf - pivot_root syscall
> to '/lxc-oldrootfs-WIzwQn' successful
>       lxc-start 1264151162.508 DEBUG    lxc_conf - umounted
> '/lxc-oldrootfs-WIzwQn/proc/bus/usb'
>       lxc-start 1264151162.508 DEBUG    lxc_conf - umounted
> '/lxc-oldrootfs-WIzwQn/lib64/rc/init.d'
>       lxc-start 1264151162.508 DEBUG    lxc_conf - umounted
> '/lxc-oldrootfs-WIzwQn/dev/pts'
>       lxc-start 1264151162.508 DEBUG    lxc_conf - umounted
> '/lxc-oldrootfs-WIzwQn/sys'
>       lxc-start 1264151162.508 DEBUG    lxc_conf - umounted
> '/lxc-oldrootfs-WIzwQn/dev'
>       lxc-start 1264151162.508 DEBUG    lxc_conf - umounted
> '/lxc-oldrootfs-WIzwQn/cgroup'
>       lxc-start 1264151162.508 DEBUG    lxc_conf - umounted
> '/lxc-oldrootfs-WIzwQn/lxc/guest_1/dev/pts'
>       lxc-start 1264151162.508 DEBUG    lxc_conf - umounted
> '/lxc-oldrootfs-WIzwQn/lxc/guest_1/dev/shm'
>   
... and umounts it. The algo seems bogus.
>       lxc-start 1264151162.508 DEBUG    lxc_conf - umounted
> '/lxc-oldrootfs-WIzwQn/lxc/guest_1/usr/portage'
>       lxc-start 1264151162.508 DEBUG    lxc_conf - umounted
> '/lxc-oldrootfs-WIzwQn/lxc/guest_1/dev/console'
>       lxc-start 1264151162.508 DEBUG    lxc_conf - umounted
> '/lxc-oldrootfs-WIzwQn/lxc/guest_1/dev/tty1'
>       lxc-start 1264151162.508 DEBUG    lxc_conf - umounted
> '/lxc-oldrootfs-WIzwQn/lxc/guest_1/dev/tty2'
>       lxc-start 1264151162.508 DEBUG    lxc_conf - umounted
> '/lxc-oldrootfs-WIzwQn/lxc/guest_1/dev/tty3'
>       lxc-start 1264151162.508 DEBUG    lxc_conf - umounted
> '/lxc-oldrootfs-WIzwQn/lxc/guest_1/dev/tty4'
>       lxc-start 1264151162.508 DEBUG    lxc_conf - umounted
> '/lxc-oldrootfs-WIzwQn/proc'
>       lxc-start 1264151162.508 DEBUG    lxc_conf - umounted
> '/lxc-oldrootfs-WIzwQn/dev/shm'
>       lxc-start 1264151162.508 ERROR    lxc_conf - Device or resource
> busy - could not unmount old rootfs
> lxc-start: Device or resource busy - could not unmount old rootfs
>       lxc-start 1264151162.508 ERROR    lxc_conf - failed to
> pivot_root to '/lxc/guest_1'
> lxc-start: failed to pivot_root to '/lxc/guest_1'
>       lxc-start 1264151162.508 ERROR    lxc_conf - failed to set
> rootfs for 'guest_1'
> lxc-start: failed to set rootfs for 'guest_1'
>       lxc-start 1264151162.509 ERROR    lxc_start - failed to setup
> the container
> lxc-start: failed to setup the container
>       lxc-start 1264151162.509 NOTICE   lxc_start - '/sbin/init'
> started with pid '8422'
>       lxc-start 1264151162.509 DEBUG    lxc_utils - closing fd '1'
>       lxc-start 1264151162.509 DEBUG    lxc_utils - closing fd '0'
>       lxc-start 1264151162.509 DEBUG    lxc_utils - closed all
> inherited file descriptors
>       lxc-start 1264151162.565 DEBUG    lxc_start - child exited
>       lxc-start 1264151162.565 INFO     lxc_error - child <8422> ended
> on error (255)
>       lxc-start 1264151162.565 DEBUG    lxc_cgroup - using cgroup
> mounted at '/cgroup'
>       lxc-start 1264151162.645 DEBUG    lxc_cgroup - '/cgroup/guest_1' unlinked
>
>   

Ok, finally I reproduced it.
Can you remove the mount option in the container configuration file 
(devpts and shm) ?