Today I Learned

A Hashrocket project

Find and Open Port with Elixir

iex(1)> {:ok, port} = :gen_tcp.listen(0, []) #listen on an available port
{:ok, #Port<0.1465>}
iex(2)> {:ok, port_number} = :inet.port(port) #get the port number of that port
{:ok, 63470}
iex(3)> port_number #here is the port number!
63470
iex(4)> Port.close port #go ahead and close that port if you want
true

Useful for maybe automating the deployment of a plug app.

Looking for help? At Hashrocket, we 💜 Elixir! From our many Elixir client projects, to sponsoring the Chicago Elixir Meetup, to the source code for this application, we are invested in this community. Contact us today to talk about your Elixir project.