How to create a docker image with Ruby and Postgresql 9.5

[pjmuller]

Hi everyone,

I would love to use docker pipeline but my Ruby on Rails app needs Postgresql 9.5. When using 

FROM ruby:2.2.1
RUN apt-get update \
  && apt-get install -y postgresql postgresql-contrib \
  && apt-get install sudo \
  && apt-get clean \
  && rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*

I'm getting the 9.4 version and  adding apt-get to the 9.5 apt-get install -y gives me an error that the package is not found. I've read that adding packages to apt get can be done as 

RUN sudo sh -c 'echo "deb http://apt.postgresql.org/pub/repos/apt/ `lsb_release -cs`-pgdg main" >> /etc/apt/sources.list.d/pgdg.list'
RUN wget -q https://www.postgresql.org/media/keys/ACCC4CF8.asc -O - | sudo apt-key add -

but this doesn't work in the dockerfile

Please help

Greetings,

PJ

[Sten Pittet]

Hi PJ,

Try this and let me know if it works?

FROM ruby:2.2.1 
RUN sh -c 'echo "deb http://apt.postgresql.org/pub/repos/apt/ precise-pgdg main" >> /etc/apt/sources.list.d/pgdg.list' \
  && wget -q https://www.postgresql.org/media/keys/ACCC4CF8.asc -O - | apt-key add - \
  && apt-get update \
  && apt-get install -y postgresql-9.5 postgresql-contrib-9.5 \
  && apt-get install sudo \
  && apt-get clean \
  && rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*
# This Dockerfile doesn't need to have an entrypoint and a command
# as Bitbucket Pipelines will overwrite it with a bash script.

You are already root so you don't need to run commands with sudo. And I found a different way to update the sources from the Docker documentation.

Cheers,

Sten