anchor.diff:  
   EXPOSE 80
   
  -VOLUME "/opt/nagios/var" "/opt/nagios/etc" "/opt/nagios/libexec" "/var/log/apache2" "/usr/share/snmp/mibs" "/opt/Custom-Nagios-Plugins" "/opt/nagiosgraph/var" "/opt/nagiosgraph/etc"
  +VOLUME "${NAGIOS_HOME}/var" "${NAGIOS_HOME}/etc" "${NAGIOS_HOME}/libexec" "/var/log/apache2" "/usr/share/snmp/mibs" "/opt/Custom-Nagios-Plugins" "/opt/nagiosgraph/var" "/opt/nagiosgraph/etc"
   
   CMD [ "/usr/local/bin/start_nagios" ]
  
positive.code: 
  ADD overlay /
  
  RUN echo "use_timezone=${NAGIOS_TIMEZONE}" >> /opt/nagios/etc/nagios.cfg
  
  # Copy example config in-case the user has started with empty var or etc
  
  RUN mkdir -p /orig/var && mkdir -p /orig/etc  && \
      cp -Rp /opt/nagios/var/* /orig/var/       && \
      cp -Rp /opt/nagios/etc/* /orig/etc/
  
  RUN a2enmod session         && \
      a2enmod session_cookie  && \
  
negative.code:     make install                                                                              && \
      make clean                                                                                && \
      mkdir -p /usr/lib/nagios/plugins                                                          && \
      ln -sf ${NAGIOS_HOME}/libexec/utils.pm /usr/lib/nagios/plugins
  
  RUN wget -O ${NAGIOS_HOME}/libexec/check_ncpa.py https://raw.githubusercontent.com/NagiosEnterprises/ncpa/v2.0.5/client/check_ncpa.py  && \
      chmod +x ${NAGIOS_HOME}/libexec/check_ncpa.py
  
  RUN cd /tmp                                                                  && \
      git clone https://github.com/NagiosEnterprises/nrpe.git -b $NRPE_BRANCH  && \
  