libvirt users - Mar 2013 - How to give access to /dev/tty

Hello,

  First I apologize because I sent this email on the lxc-users mailing 
by error. So sorry for the double message.

  I'm trying to run an X server inside a container. I was able to 
achieve this with lxc-tools (and that is why I mixed myself between the 
2 lists) by setting the option lxc.tty = 4 that allows access to 4 tty. 
Now I want to use libvirt because my final goal is to create a 
container with GPU capabilities from Openstack (that uses libvirt).

  When I start an X server with "startx -- :1" in a container I have
the error:

  Fatal server error:
  xf86OpenConsole: Cannot open /dev/tty0 (No such file or directory)

  I also tried with :2 and :3 but I still have the same error (except 
that the name of the log file changed between Xorg.{1,2,3}.log. I 
copied the xml file of my container at the end of the email.

  Thus my question is how can I give an access to /dev/tty0 to the 
container? Or maybe it is not the right way to start an X server in the 
container. Best regards,
Guillaume

<domain type='lxc' id='28247'>
  <name>lxcvm1</name>
  <uuid>d4014dfc-f4db-5791-c0d2-817547921ce1</uuid>
  <memory unit='KiB'>1048576</memory>
  <currentMemory unit='KiB'>1048576</currentMemory>
  <vcpu placement='static'>1</vcpu>
  <os>
    <type arch='x86_64'>exe</type>
    <init>/sbin/init</init>
  </os>
  <clock offset='utc'/>
  <on_poweroff>destroy</on_poweroff>
  <on_reboot>restart</on_reboot>
  <on_crash>restart</on_crash>
  <devices>
    <emulator>/usr/lib/libvirt/libvirt_lxc</emulator>
    <filesystem type='mount' accessmode='passthrough'>
      <source
dir='/home/thouveng/virtualization/lxc/lxcvm1/rootfs'/>
      <target dir='/'/>
    </filesystem>
    <interface type='network'>
      <mac address='00:16:3e:3e:06:4d'/>
      <source network='default'/>
      <target dev='veth0'/>
    </interface>
    <console type='pty' tty='/dev/pts/2'>
      <source path='/dev/pts/2'/>
      <target type='lxc' port='0'/>
      <alias name='console0'/>
    </console>
    <console type='pty'>
      <source path='/dev/pts/6'/>
      <target type='lxc' port='1'/>
      <alias name='console1'/>
    </console>
    <console type='pty'>
      <source path='/dev/pts/7'/>
      <target type='lxc' port='2'/>
      <alias name='console2'/>
    </console>
  </devices>
  <seclabel type='none'/>
</domain>

I made some others tests. To start the X server in the container I'm 
now using the command:

$ xinit  -- /usr/bin/X vt1

In my xorg.conf file I put the minimum to run the X server headless. I 
copied it at the end of this email. In the xml file of the container I 
have:

    <console type='pty'>
      <target type='lxc' port='0'/>
    </console>
    <console type='pty'>
      <target type='lxc' port='1'/>
    </console>

So the error now is:

Fatal server error:
xf86OpenConsole: VT_ACTIVATE failed: Invalid argument


This error occurs because the X server tried to do an ioctl(/dev/tty1, 
VT_ACTIVATE) on /dev/tty1 that is not a tty, it's a link to /dev/pts/0.


I tried to reply type='lxc' by type='serial' but I got the same
error.
I think that if I can provide an access to the real /dev/tty1 I will be 
able to run the X server in the container...


Can someone confirm me if it is possible to do it (I mean give an 
access to /dev/tty1 to the container) or if I'm going in the wrong 
direction to achieve my goal (that is to start a X server in the 
container (headless or not)?


Thanks for your help,
Regards,

Guillaume