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Old 01-31-2013, 10:02 PM   #1
charlie101
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Registered: Jun 2012
Posts: 10

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Outputting X display from inside an LXC Container


Hi

I'm trying to run lubuntu 12.04 from a LXC container hosted on Ubuntu 12.04.
I would like the lubuntu desktop to appear on my hosts VT9 display.
I've already done this for a text console on VT8 but would like to redirect the X output as well.

I'm suspecious it might be as simple as telling X to output to VT8 rather than VT7 which is occupied by the host. But I don't know where to find this setting in lubuntu 12.04?

I'm also concerned that running two Xservers might be a problem?

I've lost count of the number of articles I've read which mention this issue but skirt around it without answering it.

So any help would be greatly appreciated.

(Update) I tried using text console on this guest and they don't work either. It seems a more general issue then just X.
Guest is Ubuntu 12.04 same has Host.
Guest was created with the Ubuntu template.

Charlie101.

Last edited by charlie101; 02-02-2013 at 06:19 PM. Reason: update information
 
Old 02-04-2013, 10:41 PM   #2
charlie101
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Registered: Jun 2012
Posts: 10

Original Poster
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Update

Ok, so I managed to configure an Lubuntu 10.04 container's X display to pop up on a virtual terminal (F8) when the container is started. I never achieved it with 12.04. But in either case it seems to be necessary to grant all sorts of hardware access permissions to the container. Not a good idea as far as security and stability are concerned.

A better approach is to use the XDMCP protocol to remotely connect.
Once you've started the container you can simply issue the command:

Xorg -terminate -query (Container IP_ADDRESS/HOST_Name) :1

eg: Xorg -terminate -query 192.168.1.12 :1

Increment the :1 for each addition container you want to connect to a vt :2 :3 etc.
These will generally pop up as VT8, VT9, VT10 etc although they can also be assigned lower down the line as VT5 VT6 etc where they follow on from your containers reserved VT range set in the container's config file: lxc.tty = 4.

Alternatively you can edit the lightdm.conf files.

In the containers lightdm.conf file you need to add the lines:

[XDMCPServer]
enabled=true


In your hosts lightdm.conf file you need to add the lines:

[LightDM]

minimum-vt=7 #To control where the VTs start poping up on you F keys


[Seat:0] #Controls your host's X output
greeter-session=lightdm-gtk-greeter
user-session=Lubuntu
greeter-hide-users=true

[Seat:1] #Controls your first container's X output
xdmcp-manager=192.168.1.12
greeter-session=lightdm-gtk-greeter
user-session=Lubuntu

[Seat:2] #Controls your 2nd container's X output
xdmcp-manager=192.168.1.13
greeter-session=lightdm-gtk-greeter
user-session=Lubuntu

etc etc

Of course these connections could be between different physical machines across networks rather than containers on the same machine. Be aware that XDMCP is an un-encrypted protocol so has associated security risks.

Charlie101
 
  


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