.env

HOST=localhost
DATABASE_URL=ecto://nevermind:nevermind@olivetree-db/olivetree_prod?pool_size=15
PORT=5000

POSTGRES_USER=nevermind
POSTGRES_PASSWORD=nevermind
POSTGRES_DB=olivetree_prod
POSTGRES_HOST=postgres

docker-compose.yml

version: "3"
services:
  db:
    image: postgres:10.4-alpine
    container_name: olivetree-db
    networks:
      - nginx-network
  admin:
    image: olivetree-release
    container_name: olivetree-admin
    build:
      context: .
      dockerfile: Dockerfile.run
    command: migrate
    networks:
      - nginx-network
    depends_on:
      - db
  server:
    image: olivetree-release
    container_name: olivetree-server
    expose:
      - "5000"
    command: foreground
    networks:
      - nginx-network
    depends_on:
      - db
      - admin
networks:
  nginx-network:
    external: true

prod.exs

use Mix.Config

# For production, we often load configuration from external
# sources, such as your system environment. For this reason,
# you won't find the :http configuration below, but set inside
# OlivetreeWeb.Endpoint.init/2 when load_from_system_env is
# true. Any dynamic configuration should be done there.
#
# Don't forget to configure the url host to something meaningful,
# Phoenix uses this information when generating URLs.
#
# Finally, we also include the path to a cache manifest
# containing the digested version of static files. This
# manifest is generated by the mix phx.digest task
# which you typically run after static files are built.
config :olivetree, OlivetreeWeb.Endpoint,
  http: [:inet6, port: {:system, "PORT"}],
  load_from_system_env: false,
  url: [host: {:system, "HOST"}, port: {:system, "PORT"}, compress: true],
  server: true,
  root: ".",
  version: Application.spec(:olivetree, :vsn),
  cache_static_manifest: "priv/static/cache_manifest.json"

# Do not print debug messages in production
config :logger, level: :info

# ## SSL Support
#
# To get SSL working, you will need to add the `https` key
# to the previous section and set your `:url` port to 443:
#
#     config :olivetree, OlivetreeWeb.Endpoint,
#       ...
#       url: [host: "example.com", port: 443],
#       https: [:inet6,
#               port: 443,
#               keyfile: System.get_env("SOME_APP_SSL_KEY_PATH"),
#               certfile: System.get_env("SOME_APP_SSL_CERT_PATH")]
#
# Where those two env variables return an absolute path to
# the key and cert in disk or a relative path inside priv,
# for example "priv/ssl/server.key".
#
# We also recommend setting `force_ssl`, ensuring no data is
# ever sent via http, always redirecting to https:
#
#     config :olivetree, OlivetreeWeb.Endpoint,
#       force_ssl: [hsts: true]
#
# Check `Plug.SSL` for all available options in `force_ssl`.

# ## Using releases
#
# If you are doing OTP releases, you need to instruct Phoenix
# to start the server for all endpoints:
#
#     config :phoenix, :serve_endpoints, true
#
# Alternatively, you can configure exactly which server to
# start per endpoint:
#
#     config :olivetree, OlivetreeWeb.Endpoint, server: true
#

config :olivetree, Olivetree.Mailer,
  adapter: Bamboo.MailgunAdapter,
  api_key: "nevermind",
  domain: "nevermind"

config :olivetree, OlivetreeWeb.Guardian,
  secret_key: "nevermind",
  issuer: "Olivetree",
  token_ttl: %{
    "magic" => {30, :minutes},
    "access" => {1, :days}
  }

# Finally import the config/prod.secret.exs
# which should be versioned separately.
import_config "prod.secret.exs"

prod.secret.exs

use Mix.Config

# In this file, we keep production configuration that
# you'll likely want to automate and keep away from
# your version control system.
#
# You should document the content of this
# file or create a script for recreating it, since it's
# kept out of version control and might be hard to recover
# or recreate for your teammates (or yourself later on).
config :olivetree, Olivetree.Endpoint,
  secret_key_base: "nevermind"

# Configure your database
config :olivetree, Olivetree.Repo,
  adapter: Ecto.Adapters.Postgres,
  username: "nevermind",
  password: "nevermind",
  hostname: "olivetree-db",
  database: "olivetree_prod",
  pool_size: 15

config :olivetree, Olivetree.Repo,
  url: System.get_env("DATABASE_URL")