Better Docker config: Use entrypoint to setup the environment, run in production mode by default, defaults for all config values

Dockerfile

@@ -17,9 +17,11 @@ COPY . /app/
 COPY config/database.docker.yml /app/config/database.yml
 COPY config/site.docker.yml /app/config/site.yml
 
-COPY docker-startserver.sh /
+RUN RAILS_ENV=production bundle exec rake assets:precompile
+
+COPY docker-entrypoint.sh /
+ENTRYPOINT ["./docker-entrypoint.sh"]
 
 EXPOSE 3000
 
-#CMD ["rails", "server", "-e", "production", "-b", "0.0.0.0"]
+CMD ["rails", "server", "-b", "0.0.0.0"]
-CMD ["./docker-startserver.sh"]

config/database.docker.yml

@@ -1,44 +1,24 @@
-#development:
+test:
-#  adapter: mysql2
-#  database: tracks_dev
-#  # set this if you are storing utf8 in your mysql database to handle strings
-#  # like "Réné". Not needed for sqlite. For PostgreSQL use encoding: unicode
-#  # encoding: utf8
-#  host: docker
-#  port: 3307
-#  username: tracks_dev
-#  password: FqUKMWPz5mh8UPhypZvq
-
-#development:
-#  adapter: postgresql
-#  database: tracks_dev
-#  # set this if you are storing utf8 in your mysql database to handle strings
-#  # like "Réné". Not needed for sqlite. For PostgreSQL use encoding: unicode
-#  # encoding: utf8
-#  host: docker
-#  port: 5432
-#  username: tracks_dev
-#  password: password
-
-#development:
-#  adapter: sqlite3
-#  database: db.sqlite
-
-#test:
-#  adapter: mysql2
-#  database: tracks_test
-#  # set this if you are storing utf8 in your mysql database to handle strings
-#  # like "Réné". Not needed for sqlite. For PostgreSQL use encoding: unicode
-#  # encoding: utf8
-#  host: docker
-#  port: 3307
-#  username: tracks_tst
-#  password: 9rMNV4y6RVcqmJTo2QoR
-
-# Production config is disabled by default
-#
-development:
   adapter: <%= ENV.fetch('DATABASE_TYPE') %>
+  encoding: <%= ENV.fetch('DATABASE_ENCODING') %>
+  database: <%= ENV.fetch('DATABASE_NAME') %>
+  host: <%= ENV.fetch('DATABASE_HOST') %>
+  port: <%= ENV.fetch('DATABASE_PORT') %>
+  username: <%= ENV.fetch('DATABASE_USERNAME') %>
+  password: <%= ENV.fetch('DATABASE_PASSWORD') %>
+
+development:
+  adapter: <%= ENV.fetch('DATABASE_TYPE') %>
+  encoding: <%= ENV.fetch('DATABASE_ENCODING') %>
+  database: <%= ENV.fetch('DATABASE_NAME') %>
+  host: <%= ENV.fetch('DATABASE_HOST') %>
+  port: <%= ENV.fetch('DATABASE_PORT') %>
+  username: <%= ENV.fetch('DATABASE_USERNAME') %>
+  password: <%= ENV.fetch('DATABASE_PASSWORD') %>
+
+production:
+  adapter: <%= ENV.fetch('DATABASE_TYPE') %>
+  encoding: <%= ENV.fetch('DATABASE_ENCODING') %>
   database: <%= ENV.fetch('DATABASE_NAME') %>
   host: <%= ENV.fetch('DATABASE_HOST') %>
   port: <%= ENV.fetch('DATABASE_PORT') %>

config/site.docker.yml

@@ -25,12 +25,6 @@ secret_token: "secret"
 # Set to true when your application is running with https
 force_ssl: false
 
-# Configure how static assets (images, stylesheets, etc.) will be served.
-# The best practice is to have a proxying web server such as Apache or Nginx
-# serve static assets (images, stylesheets, javascript) for you. Change
-# this to 'true' if you want Rails to be responsible for serving the static assets
-# serve_static_assets: false
-
 # Uncomment if you want to dispatch todos that come from email based on the To: 
 # address rather than the From: address.
 # email_dispatch: 'to'

config/site.yml.tmpl

@@ -28,12 +28,6 @@ secret_token: "change-me"
 # Set to true when your application is running with https
 force_ssl: false
 
-# Configure how static assets (images, stylesheets, etc.) will be served.
-# The best practice is to have a proxying web server such as Apache or Nginx
-# serve static assets (images, stylesheets, javascript) for you. Change
-# this to 'true' if you want Rails to be responsible for serving the static assets
-# serve_static_assets: false
-
 # Uncomment if you want to dispatch todos that come from email based on the To: 
 # address rather than the From: address.
 # email_dispatch: 'to'

docker-entrypoint.sh

@@ -0,0 +1,17 @@
+#!/bin/bash
+
+export RAILS_ENV=${RAILS_ENV:-production}
+export DATABASE_NAME=${DATABASE_NAME:-tracks}
+export DATABASE_HOST=${DATABASE_HOST:-db}
+export DATABASE_PORT=${DATABASE_PORT:-3306}
+export DATABASE_USERNAME=${DATABASE_USERNAME:-tracks}
+export DATABASE_PASSWORD=${DATABASE_PASSWORD:-password}
+export DATABASE_TYPE=${DATABASE_TYPE:-mysql2}
+export DATABASE_ENCODING=${DATABASE_ENCODING:-utf8}
+
+export RAILS_SERVE_STATIC_FILES=TRUE
+export RAILS_LOG_TO_STDOUT=TRUE
+
+rails db:migrate
+
+exec "$@"

docker-startserver.sh

@@ -1,4 +0,0 @@
-#!/bin/sh
-
-rails db:migrate
-rails server -b 0.0.0.0