Issue setting production port number - (RuntimeError) expected the PORT environment variable to be set

Question

I'm deploying on aws with edeliver. The deploys run fine, but when I try to access the site in the console with curl localhost:8888 , I get a connection refused error.

If I try to start the app with ./rel/bin/app_name console , I get a (RuntimeError) expected the PORT environment variable to be set . However my config/prod.exs looks like this.

use Mix.Config

config :elixir_deploy, ElixirDeployWeb.Endpoint,
  load_from_system_env: true,
  http: [port: 8888],
  ssl: false,
  url: [host: "example.com", port: 80],
  cache_static_manifest: "priv/static/cache_manifest.json"

config :logger, level: :info

import_config "prod.secret.exs"

What am I missing here? It works if I set a PORT=8888 before the manual start, but I'd rather start automatically with edeliver

Answer 1

You need to set load_from_system_env to false (or just remove that line). When it's true , Phoenix's default generated endpoint.ex will use the value of the PORT environment variable, and if it's not found, it'll raise an error.

if config[:load_from_system_env] do
  port = System.get_env("PORT") || raise "expected the PORT environment variable to be set"
  {:ok, Keyword.put(config, :http, [:inet6, port: port])}
else
  {:ok, config}
end

^Source