Heroku App failed to bind to $PORT in 60 seconds

Phoenix Forum Questions / Help
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1

Hi all, I have a Elixir Umbrella with a Phoenix Web app that I am attempting to deploy to Heroku using Docker.

The Docker build and release succeeds; however, whenever I attempt to visit the running application I get the following error:

2019-01-16T18:11:28.595542+00:00 heroku[web.1]: Error R10 (Boot timeout) -> Web process failed to bind to $PORT within 60 seconds of launch

2019-01-16T18:11:28.595632+00:00 heroku[web.1]: Stopping process with SIGKILL

2019-01-16T18:11:28.685658+00:00 heroku[web.1]: Process exited with status 137

I am using Phoenix 1.4. I tried a few fixes, namely setting the http config variable correctly. My Phoenix configuration is as follows:

config :bazaar, BazaarWeb.Endpoint,
    load_from_system_env: true,
    http: [port: {:system, "PORT"}],
    url: [host: {:system, "HOST"}, port: 80],
    cache_static_manifest: "priv/static/cache_manifest.json"

The host environment variable is properly set inside the Heroku configuration. I’m not sure what else to try.

2

Is your docker image based on mix phx.server or are you using distillery to create an OTP release?

If your setup uses Distillery (which I strongly suggest), you are missing a few configuration like described in the guide:

  • server configures the endpoint to boot the Cowboy application http endpoint on start.
  • root configures the application root for serving static files.
  • version ensures that the asset cache will be busted on versioned application upgrades.

https://hexdocs.pm/distillery/guides/phoenix_walkthrough.html#distillery-configuration

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3

try with System.get_env("PORT") instead of {:system, “PORT”}

4

Is there a particular reason you’re not using this buildpack? https://github.com/HashNuke/heroku-buildpack-elixir/issues/141

That’s what we use for our umbrella app running on heroku, the main part of our phoenix (1.3) config looks like this for comparison:

config :web_interface, WebInterface.Endpoint,
  load_from_system_env: true,
  http: [port: {:system, "PORT"}],
  url: [scheme: "https", host: System.get_env("HOSTNAME"), port: 443],
  force_ssl: [rewrite_on: [:x_forwarded_proto]],
  secret_key_base: System.get_env("SECRET_KEY_BASE")
5

It is so simple to build an OTP release with Distillery, wrap it in a Docker image and deploy a container on Heroku; there are no reason to use the buildpack-based deployment anymore.

Furthermore, mix is a development tool, that will one day support building releases. It was never intended to run production code!

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