Dockerfile (minicase postgres)

# Minimal case to illustrate Docker+Postgres issue
#   i.e.: did not manage to make the Postgres data persistent when using volumes in docker-compose.
#   Derived from my normal Docker development image (itself modeled after Heroku's production environment for the stack.)
#
# Let's keep it minimal.

FROM ubuntu:16.04


# Avoid Dialog and other interactive features not suited to Dockerfiles
ENV DEBIAN_FRONTEND noninteractive


# Update and configure packages
# Installing apt-utils to avoid `debconf: delaying package configuration, since apt-utils is not installed` warning when installing programs (except for `apt-utils` itself.)
RUN apt-get update
RUN apt-get install -y --no-install-recommends apt-utils


# Install Postgres
# Should I install `postgresql-contrib` too? suffixed -9.6?
RUN apt-get install -y software-properties-common
RUN add-apt-repository -y "deb http://apt.postgresql.org/pub/repos/apt/ xenial-pgdg main"
RUN apt-get install -y wget
RUN wget --quiet -O - https://www.postgresql.org/media/keys/ACCC4CF8.asc | apt-key add
RUN apt-get update
RUN apt-get install -y postgresql-9.6
ENV PATH="${PATH}:/usr/lib/postgresql/9.6/bin"
RUN mkdir -p /var/run/postgresql/9.6-main.pg_stat_tmp && chown postgres.postgres /var/run/postgresql/9.6-main.pg_stat_tmp -R  # Prevents `could not open temporary statistics file` error
# VOLUME  ["/etc/postgresql", "/var/log/postgresql", "/var/lib/postgresql"] # I thought this might be needed, but it's not.


# Install supervisor
# (We add its config file much later, as it depends on the other installed programs and is likely to change.
# This way, we spare ourselves reinstalling things that didn't change when building the image.)
RUN apt-get install -y supervisor





# Entry point for when the image starts
ADD supervisord.conf /etc/
CMD ["/usr/bin/supervisord"]





## MEMO.
#
# BUILD THE IMAGE LIKE SO:
# cd /Users/fabien/Dropbox/DEV/Docker/images/minicase-postgres
# docker build -t fab/minicase-postgres .
# Use `--no-cache` if needed: `docker build --no-cache -t fab/minicase-postgres .`
#
# START THE IMAGE VIA DOCKER TO CHECK IT OUT:
# docker run --name myminicase -dit fab/minicase-postgres
# docker exec -it myminicase /bin/bash