deploy-elixir-on-heroku.md

Step 1

Run on terminal

heroku create --buildpack hashnuke/elixir

Step 2

Create file elixir_buildpack.config with content:

elixir_version=<VERSION>
erlang_version=<VERSION>

Step 3

Crete file Procfile with content:

web: MIX_ENV=prod mix phx.server

Step 4

Modify config/prod.exs

- url: [host: "example.com", port: 80],
+ http: [port: {:system, "PORT"}],
+ url: [scheme: "https", host: "example.herokuapp.com", port: 443],
+ force_ssl: [rewrite_on: [:x_forwarded_proto]],

Step 5

Modify config/prod.secret.exs

config :hello, Hello.Repo,
- # ssl: true,
+ ssl: true,
  url: database_url,
  pool_size: String.to_integer(System.get_env("POOL_SIZE") || "10")

Step 6

Modify lib/hello_web/endpoint.ex

defmodule HelloWeb.Endpoint do
  use Phoenix.Endpoint, otp_app: :hello

  socket "/socket", HelloWeb.UserSocket,
-   websocket: true,
+   websocket: [timeout: 45_000],
    longpoll: false

  ...
end

Step 7

Run on terminal

heroku addons:create heroku-postgresql:hobby-dev
heroku config:set POOL_SIZE=18
heroku config:set SECRET_KEY_BASE=$(mix phx.gen.secret)

Step 8

Run on terminal

MIX_ENV=prod mix ecto.migrate