The rancherOS is an operating system designed to run docker containers. It is actually designed as docker containers itself.
Though they have a raspberry pi version and is does work, there are not that many docker images for a raspberry pi.
The simple example of Linux-Dash used for testing your rancherOS on a RPi does not work for this reason.
It can be made to work with a few changes. Create a DockerFile:
FROM container4armhf/armhf-alpine LABEL architecture="ARMv7" RUN apk update && apk add unzip curl nodejs RUN curl -k -L -o master.zip https://github.com/afaqurk/linux-dash/archive/master.zip RUN unzip master.zip WORKDIR linux-dash-master RUN npm install ENTRYPOINT ["node", "server"]
Now build and run.