anchor.diff: -FROM gliderlabs/alpine:latest
  +FROM alpine:3.3
   
   # Publish the typical syslinux and pxelinux files at tftp root.
   # We only need one subtree of files from syslinux, and
  
positive.code: #
  # NOTE: If you bump the syslinux version here,
  #       please also update the README.md.
  RUN apk-install --virtual sl_plus_deps syslinux=6.03-r0 && \
      cp -r /usr/share/syslinux /tftpboot && \
      find /tftpboot -type f -exec chmod 0444 {} + && \
      apk del sl_plus_deps
  
negative.code: VOLUME /tftpboot
  
  # http://forum.alpinelinux.org/apk/main/x86_64/tftp-hpa
  RUN apk add --no-cache tftp-hpa
  
  EXPOSE 69/udp
  
  