Deployment

Make sure your configuration works in the prod files including the url host and any .env variables are ready

# Initial setup
mix deps.get --only prod
MIX_ENV=prod mix compile

# Compile assets
npm run deploy --prefix ./assets
mix phx.digest #digest/cache manifest to quickly serve assets in prod

Running

PORT=4001 MIX_ENV=prod mix phx.server
#In detached mode:
PORT=4001 MIX_ENV=prod elixir --erl "-detached" -S mix phx.server

Releases

Can make a bundle with Elixir, Erlang VM, and code that you can drop on a prod machine/docker container and run.

Gen

mix phx.gen.release apparently needed for something like running migrations in the release idk its in the guide

# Initial setup
mix deps.get --only prod
MIX_ENV=prod mix compile

# Compile assets
npm install --prefix ./assets
npm run deploy --prefix ./assets
mix phx.digest

# Build the release and overwrite the existing release directory
MIX_ENV=prod mix release --overwrite

Then using this built release

# Running
_build/prod/rel/react_phoenix/bin/react_phoenix start

# All commands
_build/prod/rel/react_phoenix/bin/react_phoenix

# Accessing while running(after ssh?)
_build/prod/rel/react_phoenix/bin/react_phoenix remote

Heroku

Need 2 buildpacks, config the version of elixir and erlang, configure config.exs

heroku create --buildpack hashnuke/elixir #will return url to use in prod
heroku buildpacks:add https://github.com/gjaldon/heroku-buildpack-phoenix-static.git

config/prod.exs

config :react_phoenix, ReactPhoenixWeb.Endpoint,
  http: [port: {:system, "PORT"}],
  url: [scheme: "https", host: "mysterious-meadow-6277.herokuapp.com", port: 443],
  cache_static_manifest: "priv/static/cache_manifest.json"

elixir_buildpack.config

elixir_version=1.10.1

# available versions https://github.com/HashNuke/heroku-buildpack-elixir-otp-builds/blob/master/otp-versions
erlang_version=21.2.5

phoenix_static_buildpack.config

node_version=12.14.1

Can let phoneix handle http to https

Now you want to make sure elixir closes connections instead of heroku

endpoint.ex

  socket "/socket", ReactPhoenixWeb.UserSocket,
    websocket: [timeout: 45_000],
    longpoll: false

Finally, generate a new secret and set it in Herkou

mix phx.gen.secret

heroku config:set SECRET_KEY_BASE="xvafzY4y01jYuzLm3ecJqo008dVnU3CN4f+MamNd1Zue4pXvfvUjbiXT8akaIF53"

Limitations:

• Connections limits simultaneous connections

• Firewalls dynos so distributed channels/tasks need to backup on Redis instead of Elixir

• Inmemory states will be lost every 24 hours

• No observer