[Lxc-users] Failed to access console after launching LXC through libvirt

[Sujay M]

Hey Qiu Yu,

I am a beginner to both lxc and openstack swift. Can you please clarify
some of my doubts related to openstack swift and lxc?


On 8 November 2012 21:39, unicell <unicell at gmail.com> wrote:

> Hi,
>
> I'm trying to manage LXC instances through OpenStack, which use libvirt as
> a virtualization driver layer. After launching LXC instance, I simply could
> not attach to the console.
>
> virsh # list
>  Id Name                 State
> ----------------------------------
> 14366 instance-00000078    running
>
> virsh # console 14366
> Connected to domain instance-00000078
> Escape character is ^]
>
>
> And it keeps stuck here.
>
> Initially I thought it could be a cgroup device config issue, and tried to
> "echo ‘c 5:1 rwm'
> >/cgroup/devices/libvirt/lxc/instance-00000078/devices.allow“, to add
> /dev/console access right to the container. But it does not work, console
> stilll not working.
>
> Before the cgroup tweaking, devices.list are as follows
>
> [root at localhost libvirt]# cat
> /cgroup/devices/libvirt/lxc/instance-0000007a/devices.list
>
> c 1:3 rwm
> c 1:5 rwm
> c 1:7 rwm
> c 1:8 rwm
> c 1:9 rwm
> c 5:0 rwm
> c 5:2 rwm
> c 136:* rwm
>
>
> I'm not quite sure what kind of issue could possibly cause this console
> access issue. Cause I'm now using two different guest OS templates on two
> different host OSes. Following are some symptoms I observed.
>
>
> * (g) for container guest OS
> * (h) for host OS
> * NOTE: Ubuntu guest os are generated by lxc-create -t ubuntu, which is an
> Ubuntu 12.04 based lxc template.
>              CentOS guest os are handcrafted by myself, taking reference
> of http://wiki.1tux.org/wiki/Lxc/Installation/Guest/Centos/6
>
>    1. Ubuntu (g) launched by lxc-start on Ubuntu 12.04 host, console works
>    2. Ubuntu (g) launched by OpenStack / libvirt on Ubuntu 12.04 host,
>    console works
>    3. Ubuntu (g) launched by OpenStack / libvirt on CentOS 6.3 host,
>    console NOT works
>    4. CentOS (g) launched by lxc-start on Ubuntu 12.04 host, console works
>    5. CentOS (g) launched by OpenStack / libvirt on Ubuntu12.04 host,
>    console NOT works
>    6. CentOS (g) launched by OpenStack / libvirt on CentOS 6.3 host,
>    console NOT works
>
> So somehow I feel it could be something related to LXC template rootfs,
> but Host OS do make a difference (2 vs. 3). lxc-start / libvirt also makes
> a difference (4 vs. 5), but that might be caused by cgroup setting.
>
> Could someone shed me some clues to further digging this issue? Thanks!
>
> --
> Qiu Yu
>
>
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>


-- 
Best Regards,

Sujay M
Final year B.Tech
Computer Engineering
NITK Surathkal

contact: +918971897571
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