How to add a network interface in lxc?

LXD
1

When i create a lxc ,there is only one interface named eth0 ， and I can see it as vethEKIFDFD in host server . I wanna add a interface named eth1, and can be see in host server ,too.
How to do it .

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2

If it’s LXD, then you’ll want something like:

lxc config device add CONTAINER-NAME eth1 nic name=eth1 nictype=bridged parent=lxdbr0

If it’s LXC, then edit /var/lib/lxc/CONTAINER-NAME/config and duplicate the existing set of lxc.network entries for your second network interface (changed the device name and possibly the bridge).

5 Likes
3

It works ！ thank you very much！

4

thank you very much ,but I have a new question.
if I create a container for the first time in host server ,there will be lxcbr0 and lxdbr0 bridge appear in host server ,and vet***1 will bridge in lxdbr0 auto.

if I create a new container ,there is no new bridge appear in the same time ,and the new vetch**2 will also bridge to lxdbr0 .

I want a new bridge will be created auto when I create a new container .

if I create a bridge by myself , is does not work rightly.

I need your help.

5

You’ll need to do something like:

  • lxc network create br-c1
  • lxc init ubuntu:16.04 c1
  • lxc config device add c1 eth0 nic nictype=bridged parent=br-c1 name=eth0
  • lxc start c1

So for every container you create, first create a new bridge, then create the container without starting it, then add its network device and then start it.

6

I do this and then got this
bridge name bridge id STP enabled interfaces
br-c1 8000.febe816a54d4 no vethXDTRTD

but there is no " lxc network create " in my lxc version .
so I use
brctl addbr br-c1
then I create a vxlan and bridge to br-c1
so,br-c1 have 2 member vxlan and vethXDTRTD( eth0 of lxc )

then i config a address of eth0 in lxc (1.1.1.1)
its remote peer vxlan also config as this one . remote address of lxc eth0 is 1.1.1.2
but I can not ping 1.1.1.2.

if I change the bridge both side to lxdbr0 .
and then I can ping 1.1.1.2 .

so ,I think maybe something wrong when I use bridge create by brctl.
it is not same with
lxc network create br-c1

but when I input lxc network create
there is no this command and give out help information
version is :
root@i-fhnacejl:~# lxc version
2.0.2

so …I still need your help

-------------------update 8.24 2017---------------
its version problem .when i got 2.16 lxc network create c1 works

thank you very much

7

Why doesn’t lxc config device add c1 eth0 add the network interface to /etc/network/interfaces inside container c1? What lxc command will do this?

8

LXD doesn’t alter files inside the container. It does however provide ways to expose that information to an agent in the container (like cloud-init) but that’s typically just for initial configuration and requires user involvement.

lxc config device add adds a device to a container, just like you’d get on a virtual machine or by adding a physical network card in a server. LXD doesn’t know (nor wants to) about the 50 different ways to then configure networking depending on the Linux distribution you’re running and what network management tool you prefer.

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