Hi,
I’m attempting to fire up a new Phoenix application in a Docker container, and I’m getting a crash on application start:
palate-web-phoenix-1 | application=phoenix [info] Running PalateWeb.Endpoint with cowboy 2.10.0 at :::8080 (http)
palate-web-phoenix-1 | application=phoenix [info] Access PalateWeb.Endpoint at http://localhost:8080
palate-web-phoenix-1 | [notice] Application palate exited: shutdown
palate-web-phoenix-1 | Kernel pid terminated (application_controller) ({application_terminated,palate,shutdown})
palate-web-phoenix-1 |
palate-web-phoenix-1 | Crash dump is being written to: erl_crash.dump...
palate-web-phoenix-1 | done
palate-web-phoenix-1 exited with code 1
I’m fine digging into find the problem on my own, but I can’t seem to find how to tell Phoenix/Elixir to print way more detailed logs than the above.
I’ve made the following changes to a completely default Phoenix 1.7.7 application:
diff --git a/README.md b/README.md
index 717ea8e..de82815 100644
--- a/README.md
+++ b/README.md
@@ -5,7 +5,7 @@ To start your Phoenix server:
* Run `mix setup` to install and setup dependencies
* Start Phoenix endpoint with `mix phx.server` or inside IEx with `iex -S mix phx.server`
-Now you can visit [`localhost:4000`](http://localhost:4000) from your browser.
+Now you can visit [`localhost:8080`](http://localhost:8080) from your browser.
Ready to run in production? Please [check our deployment guides](https://hexdocs.pm/phoenix/deployment.html).
diff --git a/config/dev.exs b/config/dev.exs
index 8acfcf2..b110e6d 100644
--- a/config/dev.exs
+++ b/config/dev.exs
@@ -2,13 +2,14 @@ import Config
# Configure your database
config :palate, Palate.Repo,
- username: "postgres",
- password: "postgres",
- hostname: "localhost",
- database: "palate_dev",
+ username: System.get_env("DATABASE_USER"),
+ password: System.get_env("DATABASE_PASS"),
+ database: System.get_env("DATABASE_NAME"),
+ hostname: System.get_env("DATABASE_HOST"),
+ pool_size: String.to_integer(System.get_env("POOL_SIZE") || "10"),
+ database_url: System.get_env("DATABASE_URL"),
stacktrace: true,
- show_sensitive_data_on_connection_error: true,
- pool_size: 10
+ show_sensitive_data_on_connection_error: true
# For development, we disable any cache and enable
# debugging and code reloading.
@@ -17,13 +18,15 @@ config :palate, Palate.Repo,
# watchers to your application. For example, we can use it
# to bundle .js and .css sources.
config :palate, PalateWeb.Endpoint,
- # Binding to loopback ipv4 address prevents access from other machines.
- # Change to `ip: {0, 0, 0, 0}` to allow access from other machines.
- http: [ip: {127, 0, 0, 1}, port: 4000],
+ http: [
+ ip: {0, 0, 0, 0, 0, 0, 0, 0},
+ port: String.to_integer(System.get_env("PORT") || "8080")
+ ],
+ net: [:inet6],
check_origin: false,
code_reloader: true,
debug_errors: true,
- secret_key_base: "3l+6f8V38k/DXx6oY3PQHqdNy8iybK1YtYHFopJDNEts/ikss/c+54cSRPuGVORz",
+ secret_key_base: System.get_env("SECRET_KEY_BASE"),
watchers: [
esbuild: {Esbuild, :install_and_run, [:default, ~w(--sourcemap=inline --watch)]},
tailwind: {Tailwind, :install_and_run, [:default, ~w(--watch)]}
@@ -66,7 +69,11 @@ config :palate, PalateWeb.Endpoint,
config :palate, dev_routes: true
# Do not include metadata nor timestamps in development logs
-config :logger, :console, format: "[$level] $message\n"
+config :logger, :console,
+ format: "$metadata[$level] $message\n",
+ metadata: [:application, :request_id]
+
+config :logger, level: :debug
# Set a higher stacktrace during development. Avoid configuring such
# in production as building large stacktraces may be expensive.
@@ -77,3 +84,5 @@ config :phoenix, :plug_init_mode, :runtime
# Disable swoosh api client as it is only required for production adapters.
config :swoosh, :api_client, false
+
+config :plug_cowboy, log_exceptions_with_status_code: [400..599]
diff --git a/config/runtime.exs b/config/runtime.exs
index cb80f04..794dafc 100644
--- a/config/runtime.exs
+++ b/config/runtime.exs
@@ -49,7 +49,7 @@ if config_env() == :prod do
"""
host = System.get_env("PHX_HOST") || "example.com"
- port = String.to_integer(System.get_env("PORT") || "4000")
+ port = String.to_integer(System.get_env("PORT") || "8080")
config :palate, PalateWeb.Endpoint,
url: [host: host, port: 443, scheme: "https"],
I started down the path of erl_crash.dump debugging, but it looks rather intense and I didn’t see an obvious way to just get a stacktrace. Maybe that’s the right path and I paused on it too soon.
What’s the best way to learn more about what’s happening in Phoenix or Elixir that’s causing the crash?
Thanks!
