[B.A.T.M.A.N.] Batman-adv + lxc

[B.A.T.M.A.N.] Batman-adv + lxc

[Christof Schulze]

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Hello,

This is my first post to this list. I would like to run batman-adv
inside an lxc-container just as described in [1]. I do not want to do it
to simulate a network having multiple nodes but to separate duties of
different "virtual machines" - linux containers in my case and to be
able to easily migrate the configuration to a differen machine lateron.

I started by loading batman-adv on the host and bridging it into the
container.  After adding the interfaces inside the container where
meshing should happen I cannot add a gateway because batctl complains
that /sys/class/net/bat0/mesh does not exist. Indeed, in the container
it does not exist.

How can batman-adv be used from an lxc-container?


Christof

[1] https://lists.open-mesh.org/pipermail/b.a.t.m.a.n/2011-September/005355.html
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Re: [B.A.T.M.A.N.] Batman-adv + lxc

[Linus Lüssing]

Hi Christof,

On Thu, Mar 20, 2014 at 07:59:16PM +0100, Christof Schulze wrote:
> Hello,
> 
> This is my first post to this list. I would like to run batman-adv
> inside an lxc-container just as described in [1]. I do not want to do it
> to simulate a network having multiple nodes but to separate duties of
> different "virtual machines" - linux containers in my case and to be
> able to easily migrate the configuration to a differen machine lateron.

lxc-container support has not been properly implemented in
batman-adv yet. So things are not always working "naturely" and can
even make your system crash (e.g. rebooting an lxc-container makes
your system crash [0]).

> 
> I started by loading batman-adv on the host and bridging it into the
> container.  After adding the interfaces inside the container where
> meshing should happen I cannot add a gateway because batctl complains
> that /sys/class/net/bat0/mesh does not exist. Indeed, in the container
> it does not exist.
> 
> How can batman-adv be used from an lxc-container?
> 

What I usually did was configuring batman-adv properly on the host
via batctl. And only in the end adding it to the lxc-container.
That seemed to work for me (except the reboot crash noted above).

Cheers, Linus

[0]: http://www.open-mesh.org/issues/179

Re: [B.A.T.M.A.N.] Batman-adv + lxc

[Antonio Quartulli]

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Hi Christof,

On 20/03/14 19:59, Christof Schulze wrote:
> How can batman-adv be used from an lxc-container?

I never used LXC, therefore I might say something terribly wrong:

what about bridging the real interface that you want to use for the mesh
in the container and then load batman-adv inside LXC ?

If I understood correctly after bridging you should have an interface
(inside LXC) that you can give to batman-adv (inside LXC).


Cheers,

-- 
Antonio Quartulli


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Re: [B.A.T.M.A.N.] Batman-adv + lxc

[Christof Schulze]

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Hi,

I only saw your replies in the mailing archives, I probably was not
signed up to the list correctly when you answered. The issue is resolved
now but that is why I am breaking my own thread.

> what about bridging the real interface that you want to use for the mesh
> in the container and then load batman-adv inside LXC ?
this is in fact what I tried first. But bridiging the interface causes
the batman-adv information in /sys/class/net to get lost. Maybe because
I have to do things in a different order or because veth is really not
the right interface type.

> > I started by loading batman-adv on the host and bridging it into the
> > container. After adding the interfaces inside the container where
> > meshing should happen I cannot add a gateway because batctl
> > complains that /sys/class/net/bat0/mesh does not exist. Indeed, in
> > the container it does not exist.
> > 
> > How can batman-adv be used from an lxc-container?

> What I usually did was configuring batman-adv properly on the host via
> batctl. And only in the end adding it to the lxc-container.  That
> seemed to work for me (except the reboot crash noted above).
what do you mean by "adding it to the lxc container"?  I tried bridging
the bat0 interface into the container as a separate nic. That did not
yield positive results.

Unfortunately if I risk crashing the host, this option is not viable for
me yet as I cannot simply restart the machine once it crashed.

Christof

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