[lxc-users] LXD 2.12 - VXLAN configuration connected to eth1

[Stéphane Graber]

Hi,

VXLAN in multicast mode (as is used in your case), when no multicast
address is specified will be using 239.0.0.1.

This means that whatever route you have to reach "239.0.0.1" will be
used by the kernel for the VXLAN tunnel, or so would I expect.


Does:
 ip -4 route add 239.0.0.1 dev eth1

Cause the VXLAN traffic to now use eth1?

If it doesn't, then that'd suggest that the multicast VXLAN interface
does in fact get tied to a particular parent interface and we should
therefore add an option to LXD to let you choose that interface.

Stéphane

On Sun, Apr 23, 2017 at 04:04:03PM -0400, Ron Kelley wrote:
> Greetings all.
> 
> Following Stéphane’s excellent guide on using multicast VXLAN with LXD (https://stgraber.org/2016/10/27/network-management-with-lxd-2-3/).  In my lab, I have setup a few servers running Ubuntu 16.04 with LXD 2.12 and multiple interfaces (eth0, eth1, eth2).  My goal is to setup a multi-tenant computing solution using VXLAN to separate network traffic.  I want to dedicate eth0 as the mgmt-only interface and use eth1 (or other additional interfaces) as customer-only interfaces. I have read a number of guides but can’t find anything that clearly spells out how to create bridged interfaces using eth1, eth2, etc for LXD.
> 
> I can get everything working using a single “eth0” interface on my LXD hosts using the following commands:
> -----------------------------------------------------------
> lxc network create vxlan100 ipv4.address=none ipv6.address=none tunnel.vxlan100.protocol=vxlan tunnel.vxlan100.id=100
> lxc launch ubuntu: testvm01
> lxc network attach vxlan100 testvm01
> -----------------------------------------------------------
> 
> All good so far.  I created two test containers running on separate LXD servers using the above VXLAN ID and gave each a static IP Address (i.e.: 10.1.1.1/24 and 10.1.1.2/24).  Both can ping back and forth.  100% working.
> 
> The next step is to use eth1 instead of eth0 on my LXD servers,  but I can’t find a keyword in the online docs that specify which interface to bind (https://github.com/lxc/lxd/blob/master/doc/networks.md).
> 
> Any pointers/clues?
> 
> Thanks,
> 
> -Ron
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