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I'm searching for a way to create multiple loopbacks in my Docker Image.

On a "normal" Ubuntu I call

sudo ifconfig lo:1 10.53.0.2/16 up
sudo ifconfig lo:2 10.53.0.3/16 up
sudo ifconfig lo:3 10.53.1.1/16 up
sudo ifconfig lo:4 10.53.1.2/16 up
to setup my loopbacks, but Docker rejects the commands with this error message:
SIOCSIFADDR: Operation not permitted
SIOCSIFFLAGS: Operation not permitted
SIOCSIFFLAGS: Operation not permitted
SIOCSIFNETMASK: Operation not permitted
I also tried creating networks with
docker network create
but that didn't work either
I'm running Docker version 17.06.0-ce and my Base Image is Ubuntu 14.04.
Maybe someone can help?
Thanks,
Chris
By default, containers run with some limitations.
When start your container, use --cap-add to be able to add sub interfaces:
docker run --cap-add NET_ADMIN
        
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