7c7,9
< FROM tomcat:7
---
> # Change: Use the "-slim" variant of the Tomcat base image.
> # The slim version includes many fewer packages.
> FROM tomcat:7-slim
23a26,32
> 
> # Change: this is a path the Tomcat server requires to be writeable.
> VOLUME /usr/local/tomcat
> 
> # Change: Streamline the final image by removing apt itself
> RUN apt-get remove -y --allow-remove-essential apt \
>     && rm -rf /var/lib/apt