1. Get Docker image as tar archive and copy to router (currently there is no 'pull' command in RouterOS, so containers should be exported from a working Docker environment). Also note that container's architecture should match with the router's.
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$ docker pull docker/example-container
$ docker save docker/example-container > my-container.tar
2. Add veth interface for the container
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[admin@MikroTik] > /interface/veth/add name=veth1 address=
172.17.0.2/16 gateway=
172.17.0.1