anchor.diff:      mkdir -p /srv/nginx/logs && \
       ln -s /usr/local/openresty/nginx/sbin/nginx /usr/local/bin && \
       ln -sf /dev/stdout /srv/nginx/logs/access.log && \
  -    ln -sf /dev/stderr /srv/nginx/logs/error.log
  +    ln -sf /dev/stderr /srv/nginx/logs/error.log && \
  +    rm -rf /var/lib/apt/lists/*
   
   WORKDIR /srv
   
  
positive.code: FROM ubuntu:xenial
  
  ENV OPENRESTY_VERSION 1.11.2.1
  ENV PATH $PATH:/opt/stapxx-master:/opt/stapxx-master/samples:/opt/FlameGraph-master
  ENV DEBIAN_FRONTEND noniteractive
  
  RUN apt-get update && \
  
negative.code:         build-essential && \
      curl -OL https://github.com/openresty/stapxx/archive/master.zip && \
      curl -o FlameGraph.zip -L https://github.com/brendangregg/FlameGraph/archive/master.zip && \
      curl -o openresty-systemtap-toolkit.zip -L https://github.com/openresty/openresty-systemtap-toolkit/archive/master.zip && \
      unzip master.zip -d /opt && \
      unzip FlameGraph.zip -d /opt && \
      unzip openresty-systemtap-toolkit.zip -d /opt && \
      rm master.zip && \
      curl -O https://openresty.org/download/openresty-${OPENRESTY_VERSION}.tar.gz && \
      curl -O https://openresty.org/download/openresty-${OPENRESTY_VERSION}.tar.gz.asc && \
  