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Creating and sharing virtualCAN network interface between docker containers


(Wahabshah) #1

My questions has two parts:-

  1. Is it possible to create a virtual CAN interface as a network device or driver on host, like a bridge
  2. After creating then sharing this virtual CAN b/w two docker containers so that they can send/receive the data on the same interface?

It is even possible to do it now by doing the following steps:-

  1. On host run the following commands to bring up virtual CAN via iproute2 ip utility:

$ sudo modprobe vcan
$ sudo ip link add dev vcan0 type vcan
$ sudo ip link set up vcan0

  1. Running the first container via:-

$ docker run --rm -it --network=host debian:stretch
root@deb123:/# apt update && apt install can-utils
root@deb123:/# candump vcan0

  1. Running the second container in another command window via:-

$ docker run --rm -it --network=host debian:stretch
root@deb123:/# apt update && apt install can-utils
root@deb123:/# cansend vcan0 180#01000000

  1. In the first container, we get the CAN message from second container:-

root@deb123:/# candump vcan0
vcan0 180 [4] 01 00 00 00

The only problem is there is no network isolation b/w docker host and containers anymore. Is there a way to achieve the above but without sharing the host network