Dockerfile

FROM debian:wheezy
MAINTAINER Mark Stillwell <mark@stillwell.me>

ENV DEBIAN_FRONTEND noninteractive
RUN sed -i 's/main/main contrib non-free/' /etc/apt/sources.list && \
    sed -i 's/httpredir.debian.org/ftp.debian.org/' /etc/apt/sources.list
RUN apt-get update && \
    apt-get -y --no-install-recommends install \
        curl \
        openssh-server \
        runit && \
    rm -rf /var/lib/apt/lists/* /var/cache/apt/*

RUN mkdir -p /etc/service/sshd && \
    echo '#!/bin/sh\nmkdir -p /var/run/sshd\nexec /usr/sbin/sshd -D' \
        > /etc/service/sshd/run && \
    chmod 0755 /etc/service/sshd/run

# init script to get ssh key from metadata service
ADD get-ssh-key.sh /etc/my_init.d/05-get-ssh-key
RUN chmod 0755 /etc/my_init.d/05-get-ssh-key

# add my_init.sh
ADD my_init.sh /sbin/my_init
RUN chmod 0755 /sbin/my_init

EXPOSE 22

CMD [ "/sbin/my_init" ]