anchor.diff:          python-docopt \
           python-pip \
           python-pyasn1 \
  +        python-netaddr \
  +# Required by calico-felix, eventually should be removed.
  +        python-zmq \
           python-gevent && \
       apt-get clean && \
       rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/* \
  
positive.code: #    echo "Pin: origin binaries.projectcalico.org" >> /etc/apt/preferences && \
  #    echo "Pin-Priority: 1001" >> /etc/apt/preferences
  
  # Install dependencies shared with the master node.  If we can keep this
  # in sync then we'll share an FS layer with the master to speed downloads.
  RUN apt-get update && \
      apt-get install -qy \
  #        calico-felix \
          ipset \
          iptables \
          libffi-dev \
  
negative.code: # Confd
  RUN curl -L https://github.com/kelseyhightower/confd/releases/download/v0.7.1/confd-0.7.1-linux-amd64 -o confd && \
      chmod +x confd
  
  # Powerstrip
  RUN curl -L https://github.com/ClusterHQ/powerstrip/archive/v0.0.1.tar.gz \
  