[TriLUG] Shrinking docker images

[Todd Edwards via TriLUG]

I highly recommend checking out Alpine for use as your base image.

https://hub.docker.com/_/alpine/

On Mon, Oct 24, 2016 at 10:45 AM, Aaron Joyner via TriLUG <trilug at trilug.org
> wrote:

> You might want to investigate if there's a Unikernel (
> https://en.wikipedia.org/wiki/Unikernel) implementation for Mono.
> AtamanOs
> (https://github.com/atmanos/atmanos) is a highly experimental variation on
> that theme for Go.  The basic idea is "a library that allows your binary to
> be invoked by and communicate directly with the hypervisor" or "ditch
> *all* of
> that OS, you don't need any of it".
>
> Disclaimer: I don't have any first-hand experience which would recommend
> this for anything you want to be reliable.  The technology is still it its
> very early days.
>
> On Mon, Oct 24, 2016 at 9:53 AM, Greg Cox via TriLUG <trilug at trilug.org>
> wrote:
>
> > 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
> > >>>
> > >>
> > > --
> > > This message was sent to: glcox at pobox.com <glcox at pobox.com>
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> > --
> > This message was sent to: Aaron S. Joyner <aaron at joyner.ws>
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> that
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> >
> --
> This message was sent to: Todd Edwards <todd at mtn.cc>
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>