R SIG Debian - Jun 2020 - Update on docker Python:3 and adding R:4.x

I want to build a couple of containers by function instead of replicating
even slim images for every single package. My current base image provides
an updated debian and python3 image.

Dave Lange
Kenmore, WA

On Wed, Jun 24, 2020 at 3:18 PM Sean Southard <sean.m.southard at
gmail.com>
wrote:
> Dave is there a specific reason you want to install both in one container?
>
> It is somewhat antithetical to the purpose of docker if you don't have
a
> direct need.
>
> Also, it sounds like you are making your own python base image when you
> probably want to use a lightweight python image instead and just add layers
> to the image.
>
> But I totally get it if your intent is to learn or you want to build one
> just for some specific application or for fun.
>
>
>
> On Wed, Jun 24, 2020 at 4:15 PM Dave Lange <umbrellahouse at
gmail.com>
> wrote:
>
>>  I continue to receive an error installing R via dockerfile on a buster
>> image python:3.
>> E: The value 'buster-cran40' is invalid for
APT::Default-Release as such a
>> release is not available in the sources
>>
>> My starting point is the debian buster based Python:3 image adding a
>> couple
>> of python specific configurations and then using the commands in the R
>> project documentation for installing R on Buster. I got slightly
different
>> answers when I used apt versus apt-get. There were warnings about
>> unverified sources solved by a reference to the certificate key.
>>
>> It turns out building the python container and commenting the R
commands
>> out allowed me to manually step through my dockerfile lines. Its
>> repeatable
>> that the R install fails with the error above when in the dockerfile.
>> Running the commands manually allows the installation to finish
>> successfully.  I sense that docker is multithreaded and hits the
"use
>> buster-cran40" before it defines buster-cran40. Manually stepping
through
>> the commands keeps the preferred order. At this point I'm happy
with a
>> repeatable process.
>>
>> It sounds like I have been re-inventing the wheel, which has been
>> educational for me. If someone wants to change my starting point to
>> something that already has stable/latest production for debian, Python3
>> and
>> R4 and will be updated for the future I would appreciate the head
start.
>>
>> Thanks for the volunteer support I have received here.
>> Dave Lange
>> Kenmore, WA
>>
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>>
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>> R-SIG-Debian at r-project.org
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>>
>
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