[TriLUG] Shrinking docker images

[Greg Cox via TriLUG]

Tried it your way, got a 322M image.

=====
FROM ubuntu:latest
RUN apt-get update && apt-get --no-install-recommends --no-install-suggests
-y install mono-runtime curl unzip mono-vbnc && rm -rf /var/lib/apt/lists/*
WORKDIR /yWriter6
RUN curl -SL -o /tmp/yWriter.zip http://www.spacejock.com/files/yWriter6.zip
&& unzip -d /yWriter6 /tmp/yWriter.zip && rm -f /tmp/yWriter.zip
CMD mono bin/yWriter.exe
=====
^ 203M image.

Ubuntu:latest is 127M, and yWriter.zip is 4M unzipped.  Unless you can cut
some muscle, or use a super-stripped distro like Igor suggests, there's the
obvious fat I can see to cut.

On Mon, Oct 24, 2016 at 7:28 AM, J. S. Evans via TriLUG <trilug at trilug.org>
wrote:

> 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
>>>
>>
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