[Lxc-users] Alternative network protocols

[Joe Stringer]

On 17 July 2012 13:59, Stéphane Graber <stgraber at ubuntu.com> wrote:
> On 07/16/2012 09:24 PM, Joe Stringer wrote:
>> Hi there,
>>
>> I've come across an issue when trying to use SCTP with lxc, and I
>> wonder if anyone might have some insight into what's causing this.
>>
>> My set up has two lxc hosts connected to an instance of Open vSwitch,
>> vm0 and vm1. When I attempt to use the sctp_test utility that comes
>> with the debian package lksctp-tools from within either VM, it reports
>> back that the address family is not supported:-
>>
>>
>> root at vm0:~# sctp_test -H 0 -P 250 -l
>> local:addr=0.0.0.0, port=250, family=2
>> seed = 1342081047
>>
>> Starting tests...
>>         socket(SOCK_SEQPACKET, IPPROTO_SCTP)
>>
>>                *** socket: failed to create socket:  Address family
>> not supported by protocol ***
>>
>>
>> The interfaces appear to be set up fine, I can ping from one vm to the
>> other with no trouble. The host can successfully run the above command
>> as well.
>>
>> Is this because of socket using SOCK_SEQPACKET?
>>
>> Cheers,
>> Joe
>
> It's not easy to tell whether it's the case here, but some protocols
> require extra kernel modules to work properly.
> On a regular system these modules are loaded dynamically the first time
> you try to create a socket of that type, but in a container, it
> typically won't work.
>
> If that's the case, check on a regular system what the modules are and
> load them on your host, then try again from the container.
>
> --
> Stéphane Graber
> Ubuntu developer
> http://www.ubuntu.com
>
>

Hi Stéphane,

Thanks for the quick reply. You're right regarding the use of a kernel
module to support SCTP. I have loaded the 'sctp' module on the host,
but the container still throws up the same error with sctp_test. I
tried restarting the containers after loading the module, but this
doesn't make a difference.

Are there any configuration files I could post that might help to
identify the cause of this?

Cheers,
Joe