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phoenix-in-docker

adapted from: [source]

Goal: create a working development environment for examples in Programming Phoenix (April 2016).

before getting started, install docker

init your development environment via docker-compose

$ alias dc="docker-compose"
$ cp .env.example .env
$ nano .env  # configure psql database name, username, password
$ dc build
$ dc up

you will take down your environment and rebuild, as necessary

$ dc down
$ dc rm
$ dc build
$ dc up

create a new phoenix application

$ dc run app \
    mix phoenix.new # to get help text
$ dc run app \
    mix phoenix.new . --app hello
$ dc run app \
    mix ecto.create
$ sudo chown -R ${USER}:${USER} .  # fix permissions of generated files

initialize the application database

# config/dev.exs

config :hello, Hello.Repo,
  adapter: Ecto.Adapters.Postgres,
  url: System.get_env("DATABASE_URL"),
  pool_size: 10
$ dc up
$ dc run app \
    mix ecto.create

uncomment lines in Dockerfile.development, then dc down && dc build

boot it up!

$ dc up

visit http://localhost:4000/

see which files violate elixir formatting rules, remove --check-formatted to format source code

$ dc run app \
    mix format --check-formatted