[Lxc-users] a newbie question, trying lxc on Debian :-

[Alex]

Thanks for that. The lwn.net article is very useful
-AK


On Sun, Sep 15, 2013 at 9:08 PM, Fajar A. Nugraha <list at fajar.net> wrote:

> On Sun, Sep 15, 2013 at 4:53 PM, Alex <equetts at gmail.com> wrote:
>
>> I'm after a simple example how to configure and run lxc from scratch on
>> Debian Wheezy (e.g. configuring a lxc container manually to run a single
>> process within a container, no networking, would be good).
>>
>>
> Good luck with that :)
>
>
>> All suggestions appreciated.
>>
>>
> It depends on what you need.
>
> A container is a combination of lots of things like chroot and various
> namespaces. I suggest you start by reading http://lwn.net/Articles/531114/ . For
> example, if you have a rogue program that binds to all iP addresses by
> default and would like to restrict it to only use one IP address, you might
> find network namespaces most useful.
>
> If you want the least-painful-way to learn about lxc, I'd  recommend using
> ubuntu as the host, create a container using the ubuntu template, and then
> install "lxc" package inside the container as well (since you need this to
> be able to run "lxc-execute").
>
> Something that "run a single process within a container" would be
> lxc-execute, but in my experience it doesn't behave the way you want it to.
> For example, if you have /usr/lib/x86_64-linux-gnu/lxc/lxc-init inside the
> container (i.e. you have "lxc" package installed inside the container as
> well), these commands somewhat work ("ffmpeg" is the name of my container):
>
> # lxc-execute -n ffmpeg -- ls
> lxc-init: failed to mount /dev/shm : No such file or directory
> bin  boot  core  data  dev  etc  home  lib  lib64  media  mnt  opt  proc
>  root run  sbin  selinux  srv  sys  tmp  usr var
>
> # lxc-execute -n ffmpeg -- ps -efa
> lxc-init: failed to mount /dev/shm : No such file or directory
> UID        PID  PPID  C STIME TTY          TIME CMD
> root         1     0  2 11:03 ?        00:00:00 /usr/lib/lxc/lxc-init --
> ps -efa
> root         2     1  0 11:03 ?        00:00:00 ps -efa
>
>
> ... while an interactive shell doesn't work the way I want it to
>
> # lxc-execute -n ffmpeg -- bash
> lxc-init: failed to mount /dev/shm : No such file or directory
> root at ffmpeg:/# root at ffmpeg:/# root at ffmpeg:/# lxc-execute: Input/output
> error - failed to read
> bin  boot  core  data  dev  etc  home  lib  lib64  media  mnt  opt  proc
>  root  run  sbin  selinux  srv  sys  tmp  usr  var
> root at ffmpeg:/# exit
>
> [1]+  Stopped                 lxc-execute -n ffmpeg -- bash
> A ~ # fg
> lxc-execute -n ffmpeg -- bash
>
> (note that I needed to run "fg" at the end to get lxc-execute to stop
> completely at the end).
>
> --
> Fajar
>
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