Dear others,
using LXC at work in a server environment for years, this days I start to use
it at home. My goal here is to set up a Ubuntu Desktop Container running on the
existing vanilla PC acting as my home server. Up to now it was used as a server
(router, firewall, NAS, DLNA-server, ...); it was managed "nearly headless" via
ssh and on a simple VGA text mode console for emergencies. For the "Desktop
Container" project, i have added a simple 3D graphic card and attached an
WSXGA-display and a mouse, too.
On the host (running on Gentoo), i have installed LXC 1.0.7 and as the
container rootfs, I use a copy of one of my already established and
well-working Ubuntu 14.04 Desktop installations.
To do it step-by-step, i have first started with a "Ubuntu-Server" container.
With this, i do the basics like a proper network setup. Then, i just add a few
more lines to the configuration file an switch the rootfs to the Desktop clone.
# Template used to create this container:
/usr/share/lxc/templates/lxc-download
# Parameters passed to the template: --no-validate --dist ubuntu
--release trusty --arch amd64
# For additional config options, please look at lxc.container.conf(5)
# Distribution configuration
lxc.include = /usr/share/lxc/config/ubuntu.common.conf
[... usual basic and network setup ...]
# Desktop-Container: Allow direct access to video and input devices
lxc.mount.entry = /dev/dri dev/dri none
bind,optional,create=dir
lxc.mount.entry = /dev/input dev/input none
bind,optional,create=dir
lxc.cgroup.devices.allow = c 4:7 rwm # /dev/tty7 X Desktop
lxc.cgroup.devices.allow = c 4:8 rwm # /dev/tty8 X Desktop
lxc.cgroup.devices.allow = c 4:9 rwm # /dev/tty9 X Desktop
lxc.cgroup.devices.allow = c 29:0 rwm # /dev/fb0/* framebuffer device
lxc.cgroup.devices.allow = c 226:* rwm # /dev/dri/* video card devices
lxc.cgroup.devices.allow = c 13:* rwm # /dev/input/* input devices
After a a few tweaks, this already runs very well: I just disabled some
unnecessary services (avahi, bluetooth, cups, udev, ureadahead) in /etc/init/
because they produce a lot of "useless noise".
To get the keyboard and mouse working, before i have to install the package
xserver-xorg-input-kbd and have to add the file
/etc/X11/xorg.conf.d/10-input.conf containing
Section "ServerFlags"
Option "AutoAddDevices" "False"
EndSection
Section "ServerLayout"
Identifier "Desktop"
InputDevice "Mouse0" "CorePointer"
InputDevice "Keyboard0" "CoreKeyboard"
EndSection
Section "InputDevice"
Identifier "Keyboard0"
Driver "kbd"
Option "XkbLayout" "de"
EndSection
Section "InputDevice"
Identifier "Mouse0"
Driver "mouse"
Option "Protocol" "auto"
Option "Device" "/dev/input/mice"
Option "ZAxisMapping" "4 5 6 7"
EndSection
Then I was able to interact with the X server and even switch between the
containers X Desktop and the hosts textmode terminals out of the box.
But now I stuck at an issue concerning the GUI versions of software management:
The apt commandline tools work, but the GUI program update-manager shows the
error message "You are not allowed to perform this action" and fail to work.
However, if i start it with 'gksudo update-manager', there is no such message.
In the same way, the software-manager or other GUI methods to install/remove
software is not working. May anybody please have a hint what might be missing
in the container setup or have to be tweaked inside?
greetings
Guido
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