Example of how to start a container with multiple network interfaces using docker

Adding a network interface to the container

1 Run a container with default network mode

# docker run --name tst_add_inf -it tst_img /bin/bash

In this way, we create a container named tst_add_inf through the image tst_img on the host machine. This container has created a network interface eth0 by default.

2 Get the PID of the container

# docker inspect -f '{{.State.Pid}}' tst_add_inf

The PID of the container obtained above is the process PID of container process 1 in the host machine namespace.

3 Add network interface eth1 to the container

(1) Create a pair of veth peer devices

# ip link add veth0 type veth peer name veth1 

After creation, you can see the two newly created devices through "ip link list".

(2) Add the veth end to the bridge

# brctl addif docker0 veth0
# ip link set veth0 up 

(3) Associate the other end of veth with the container

# ln -s /proc/$pid/ns/net /var/run/netns/$container_id
# ip link set veth1 netns $pid

(4) Configure the newly added network interface of the container

Rename the new interface to eth1 and change its IP address.

# ip netns exec $pid ip link set dev veth1 name eth1
# ip netns exec $pid lp link set eth1 up

After the container is up you can do it with "docker network connect", but that means the process is already running and might miss new ones.

This question is a search on docker and multiple network interfaces. Although not the required version I leave some information here:

With Docker 1.12, it is possible to add multiple network interfaces to a docker container, but you first need to create the container, then attach the second (and subsequent) network NICs before starting the container:

$docker create --network=network1 --name container_name containerimage:latest
$docker network connect network2 container_name
$docker start container_name

You need to create a network first:

$docker network create --driver=bridge network1 --subnet=172.19.0.0/24
$docker network create --driver=bridge network2 --subnet=172.19.1.0/24

Additionally, you can start a container with the Dockerhost network interface by using the --network=host parameter in docker run:

$docker run --net=host containerimage:latest

Translated from: http://stackoverflow.com/questions/34110416/start-container-with-multiple-network-interfaces

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