Today I Learned

A Hashrocket project

Specifying The Phoenix Server Port

Running mix phx.server for a Phoenix project with the default settings will attach the server to port 4000.

If you'd like to use a different port in development, you can change it in config/dev.exs.

config :my_app, MyApp.Web.Endpoint,
  http: [port: 4444],

Alternatively, you can allow it to be configurable from the command line with an environment variable and a fallback port.

config :my_app, MyApp.Web.Endpoint,
  http: [port: System.get_env("PORT") || 4000],


$ PORT=4444 mix phx.server

will launch the server on port 4444.

Looking for help? Elixir is quickly gaining momentum for web applications that need concurrency, performance, and the ability to connect to many different clients. The developers at Hashrocket are learning along with the rest of the development community that Elixir and Phoenix are viable Rails alternatives for the right application. Contact us if you need help with your Elixir project.