anchor.diff:  
   # https://docs.mongodb.com/manual/tutorial/install-mongodb-on-ubuntu/
   # RUN echo "deb [ arch=amd64,arm64 ] http://repo.mongodb.org/apt/ubuntu xenial/mongodb-org/3.4 multiverse" | sudo tee /etc/apt/sources.list.d/mongodb-org-3.4.list
  -
  -RUN echo "deb http://repo.mongodb.org/apt/ubuntu xenial/mongodb-org/$MONGO_MAJOR multiverse" > /etc/apt/sources.list.d/mongodb-org-$MONGO_MAJOR.list
  +RUN echo "deb http://repo.mongodb.org/apt/ubuntu xenial/mongodb-org/$MONGO_MAJOR multiverse" | sudo tee /etc/apt/sources.list.d/mongodb-org-$MONGO_MAJOR.list
   # RUN echo "deb http://repo.mongodb.org/apt/ubuntu trusty/mongodb-org/3.4 multiverse" | sudo tee /etc/apt/sources.list.d/mongodb-org-3.2.list
   
   RUN set -x \
   	&& apt-get update \
   	&& apt-get install -y \
  -## from mongodb repo dev version 3.5.13
  -##      --allow-unauthenticated\
  -##        mongodb-org-unstable \
  -## from mongodb repo production version 3.4.9
  -##      --allow-unauthenticated\
  -        mongodb-org \
  -# from ubuntu repo version 3.2.11
  -##      mongodb \
  +## from mongodb repo production version 3.6
  +##  --allow-unauthenticated\
  +    mongodb-org \
   #		${MONGO_PACKAGE}=$MONGO_VERSION \
   #		${MONGO_PACKAGE}-server=$MONGO_VERSION \
   #		${MONGO_PACKAGE}-shell=$MONGO_VERSION \
  
positive.code:   && rm -rf /var/lib/apt/lists/* \
  # && rm -rf /var/lib/mongodb
  	&& mv /etc/mongod.conf /etc/mongod.conf.orig
  ###  && echo kernel/mm/transparent_hugepage/enabled = never >> /etc/sysfs.conf \
  ##  && mkdir -p /data/db /data/configdb \
  ##	&& chown -R mongodb:mongodb /data/db /data/configdb
  
  
negative.code: 
  
  # add our user and group first to make sure their IDs get assigned consistently, regardless of whatever dependencies get added
  RUN groupadd -r mongodb && useradd -r -g mongodb mongodb
  
  ### RUN apt-get update \
  ### 	&& apt-get install -y \
  