[Lxc-users] Networking issues with LXC
Daniel Lezcano
daniel.lezcano at free.fr
Wed Feb 10 21:21:36 UTC 2010
Daniel Lezcano wrote:
> Michael B. Trausch wrote:
>> Hello,
>>
>> I am running LXC version 0.6.5, with kernel 2.6.32.7. I am having some
>> pretty significant troubles getting networking to reliably work with the
>> containers. That is to say, the host name is doing just fine, and
>> answers network requests all the time. However, the containers
>> sometimes fail to respond to network for requests for several seconds
>> and several connection attempts. This isn't a problem in that it's
>> rejecting connections on the ports specifically; it's as if there is no
>> machine on my network with the IP address assigned to the container,
>> until it comes alive again and answers the network.
>>
>> If I work with a container after getting a connection, I can reach that
>> container for several minutes (usually---sometimes it will cut off a
>> connection, though, and then it is again as if that IP address doesn't
>> exist on my network).
>>
>> I'm out of options as far as getting this working: This network
>> configuration works with containers under OpenVZ or full virtual
>> machines in KVM, where the virtualized network cards are attached to the
>> bridge. The IP configuration is handed out by DHCP, (except for my
>> public IP addresses, which are manually assigned) and the IP addresses,
>> netmasks, default routes, gateways, broadcast addresses, and so forth
>> are all correct. Nonetheless, the networking is *extremely* unreliable.
>>
>> I don't know how to provide additional information to attempt to work
>> through a problem like this; any guidance in this area would be greatly
>> appreciated.
>>
> Mmh, hard to answer.
>
> Can you give the following information:
>
> * how many containers are running on the host ?
>
> For the host and the containers:
> * 'ip addr show'
> * ip neigh show
> * 'brctl show'
>
> And a tcpdump :
>
> tcpdump -i any dst or src <containerip>
>
> And then try to ping or connect to/from the container to make tcpdump
> show something.
>
Oh ! I forgot the container configurations too, please.
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