Dockerfile for SSHD with Ubuntu on RPi2

Dockerfile_for_SSHD_with_Ubuntu_on_RPi2.dockerfile

# sshd
# VERSION: 0.0.2
# origin: 
#   MAINTAINER Sven Dowideit <SvenDowideit@docker.com>
#   https://docs.docker.com/examples/running_ssh_service/
#
# modified by: Wei Lin
# date: 2015/9/2

# Pull base image.
FROM armv7/armhf-ubuntu:14.04

MAINTAINER Wei Lin

ENV TERM linux

# Install SSH
RUN apt-get update && \
    apt-get install -y openssh-server && \
    mkdir /var/run/sshd

# root password and login permission / use user pi instead
# RUN echo 'root:raspberry' | chpasswd
# RUN sed -i 's/PermitRootLogin without-password/PermitRootLogin yes/' /etc/ssh/sshd_config

# Add user pi
RUN useradd -G adm,sudo,users -s /bin/bash -m pi && \
    echo 'pi:raspberry' | chpasswd

# SSH login fix. Otherwise user is kicked off after login
RUN sed 's@session\s*required\s*pam_loginuid.so@session optional pam_loginuid.so@g' -i /etc/pam.d/sshd

# Upgrade and clean up
RUN apt-get dist-upgrade -y && \
    apt-get autoremove -y && \
    apt-get autoclean -y && \
    apt-get clean -y && \
    rm -rf /var/lib/apt/lists/* 

# Environment variables
RUN echo " " >> /etc/profile && \
    echo "#_____________________" >> /etc/profile && \
    echo "force_color_prompt=yes" >> /etc/profile && \
    echo "alias cls='clear'" >> /etc/profile && \
    echo "export TERM=linux" >> /etc/profile 

# Expose port 22
EXPOSE 22

# Define default command.
CMD ["/usr/sbin/sshd", "-D"]