[TriLUG] Shrinking docker images

[J. S. Evans via TriLUG]

It's actually really simple, but mono has a lot of dependencies, whether 
they are actually needed or not, I don't know.

FROM ubuntu:latest
RUN apt-get update && apt-get install mono-runtime wget unzip mono-vbnc
RUN mkdir /yWriter6
RUN cd /yWriter6
RUN wget http://www.spacejock.com/files/yWriter6.zip
RUN unzip yWriter6.zip
CMD mono bin/yWriter6.exe


On 10/24/16 07:09, Greg Cox wrote:
> You might want to post a redacted Dockerfile for us to poke at.
>
>
> That said, I trim a bit off my images by my package-installer RUN being:
>
> RUN apt-get update && \
> apt-get --no-install-recommends --no-install-suggests -y install PKG1 PKG2 && \
> rm -rf /var/lib/apt/lists/*
>
>
>
>> On 23 Oct 2016, at 23:48, J. S. Evans via TriLUG <trilug at trilug.org> wrote:
>>
>> Is there an application that can delete non-essential parts of a docker image?  For example, I wrote a docker image to run a windows app with mono using the stock Ubuntu base image. The image works and the container that I create with it runs the app, but after the image was built, it was > 300MB. I would like to know if there is an easy way to determine what parts of the filesystem would be safe to delete.
>>
>> My guess would be to run ps while it is running and delete anything that's not needed such apt/dpkg or anything in /var, /usr/local, etc.  Does anyone know of an application that I could run that would do this for me without the headache?
>>
>> Jason