$ docker build -t djample-base . Sending build context to Docker daemon 49.51MB Step 1/4 : FROM ubuntu:18.04 AS djample-base ---> 74f8760a2a8b Step 2/4 : RUN useradd www --create-home --shell /bin/bash ---> Using cache ---> 536f8417ec7c Step 3/4 : WORKDIR /home/www ---> Using cache ---> fc05ab643d75 Step 4/4 : RUN set -x; apt-get update -y && apt-get install -y cron && apt-get install -y python3.6