Mix release not working on Phoenix live view demo app


I am toying with Phoenix LiveView and I have setup an app with mix phx.new demo --live --no-ecto.

My primary objective is to create a release of this app, so then I can adapt it to what I need, but I am having trouble.


In order to create a release for my demo app I followed the Deploying with releases tutorial and changed all the necessary files.

Added the following to my mix.exs:

  def project do
      app: :demo,
      version: "0.1.0",
      elixir: "~> 1.7",
      elixirc_paths: elixirc_paths(Mix.env()),
      compilers: [:phoenix, :gettext] ++ Mix.compilers(),
      start_permanent: Mix.env() == :prod,
      aliases: aliases(),
      deps: deps(),
      releases: releases()

  defp releases, do:
      demo: [
        applications: [demo: :permanent]

And changed the files listed in Runtime Configurations properly as well:

However, when I execute _build/prod/rel/my_app/bin/demo start nothing happens. If I execute _build/prod/rel/my_app/bin/demo start_iex I get the following output:

$ _build/prod/rel/demo/bin/demo start_iex
Erlang/OTP 22 [erts-10.6.4] [source] [64-bit] [smp:12:12] [ds:12:12:10] [async-threads:1] [hipe]

*** ERROR: Shell process terminated! (^G to start new job) ***
Erlang/OTP 22 [erts-10.6.4] [source] [64-bit] [smp:12:12] [ds:12:12:10] [async-threads:1] [hipe]

Interactive Elixir (1.11.3) - press Ctrl+C to exit (type h() ENTER for help)

Which leads me to believe something crashed.

When I visit localhost:4000 it says the server is down.


What am I doing wrong?

Is your code on GitHub or anywhere I could see it? Without it I’m just guessing here, but it looks like maybe Phoenix isn’t actually serving your app.

Is this line in your config?

config :demo, DemoWeb.Endpoint, server: true

You guessed right :smiley: