Docker development environment

Dockerfile.dev

@@ -0,0 +1,20 @@
+# Elixir + Phoenix
+
+FROM elixir:1.9.4
+
+# Install debian packages
+RUN apt-get update
+RUN apt-get install --yes build-essential inotify-tools postgresql-client
+
+# Install Phoenix packages
+RUN mix local.hex --force
+RUN mix local.rebar --force
+RUN mix archive.install --force https://github.com/phoenixframework/archives/raw/master/phx_new.ez
+
+# Install node
+RUN curl -sL https://deb.nodesource.com/setup_6.x -o nodesource_setup.sh
+RUN bash nodesource_setup.sh
+RUN apt-get install --yes nodejs npm
+
+WORKDIR /app
+EXPOSE 4000

config/dev.exs

@@ -3,8 +3,8 @@ import Config
 # Configure your database
 config :emoji, Emoji.Repo,
   username: "postgres",
-  password: "postgres",
-  hostname: "localhost",
+  password: System.get_env("DB_PASS", "postgres"),
+  hostname: System.get_env("DB_HOST", "localhost"),
   database: "emoji_dev",
   stacktrace: true,
   show_sensitive_data_on_connection_error: true,

config/test.exs

@@ -7,8 +7,8 @@ import Config
 # Run `mix help test` for more information.
 config :emoji, Emoji.Repo,
   username: "postgres",
-  password: "postgres",
-  hostname: "localhost",
+  password: System.get_env("DB_PASS", "postgres"),
+  hostname: System.get_env("DB_HOST", "localhost"),
   database: "emoji_test#{System.get_env("MIX_TEST_PARTITION")}",
   pool: Ecto.Adapters.SQL.Sandbox,
   pool_size: 10

dev.sh

@@ -0,0 +1,53 @@
+#!/bin/sh
+# Adapted from Alex Kleissner's post, Running a Phoenix 1.3 project with docker-compose
+# https://medium.com/@hex337/running-a-phoenix-1-3-project-with-docker-compose-d82ab55e43cf
+
+set -e
+
+
+# Ensure the app's dependencies are installed
+mix deps.get
+
+# Prepare Dialyzer if the project has Dialyxer set up
+if mix help dialyzer >/dev/null 2>&1
+then
+  echo "\nFound Dialyxer: Setting up PLT..."
+  mix do deps.compile, dialyzer --plt
+else
+  echo "\nNo Dialyxer config: Skipping setup..."
+fi
+
+# Install JS libraries
+# echo "\nInstalling JS..."
+# cd assets && npm install
+# cd ..
+
+# Wait for Postgres to become available.
+until psql -h db -U "postgres" -c '\q' 2>/dev/null; do
+  >&2 echo "Postgres is unavailable - sleeping"
+  sleep 1
+done
+
+echo "\nPostgres is available: continuing with database setup..."
+
+#Analysis style code
+# Prepare Credo if the project has Credo start code analyze
+if mix help credo >/dev/null 2>&1
+then
+  echo "\nFound Credo: analyzing..."
+  mix credo || true
+else
+  echo "\nNo Credo config: Skipping code analyze..."
+fi
+
+# Potentially Set up the database
+mix ecto.create
+mix ecto.migrate
+
+echo "\nTesting the installation..."
+# "Prove" that install was successful by running the tests
+mix test
+
+echo "\n Launching Phoenix web server..."
+# Start the phoenix web server
+mix phx.server

docker-compose.yml

@@ -0,0 +1,18 @@
+version: '3.8'
+services:
+  web:
+    build: .
+    command: "./dev.sh"
+    ports:
+      - "4000:4000"
+    volumes:
+      - .:/app
+    depends_on:
+      - db
+    environment:
+      - DB_PASS=
+      - DB_HOST=db
+      - MIX_ENV=dev
+
+  db:
+    image: postgres