You may mount them as well. I used a docker volumes for that.
So, the command would be like this:
docker run -it --rm -p 15003:15002 -v /mnt/storj/multinode/identity:/app/identity -v /mnt/storj/multinode/config:/app/config storjlabs/multinode:latest
However, the :latest is outdated… But you may specify the correct tag directly. You can take the latest one from the Docker Hub.