Home/ Questions/Q 38083
In Process

The Archive Base Latest Questions

Editorial Team
  • 0
Asked: 2026-05-10T14:39:07+00:00

I’m in the process of maintaining a Ruby on Rails app and am looking

  • 0

I’m in the process of maintaining a Ruby on Rails app and am looking for an easy way to find the hostname or IP address of the box I’m on (since it’s a VM and new instances may have different hostnames or IP addresses). Is there a quick and easy way to do this in Ruby on Rails?

Edit: The answer below is correct but the clarification Craig provided is useful (see also provided link in answer):

The [below] code does NOT make a connection or send any packets (to 64.233.187.99 which is google). Since UDP is a stateless protocol connect() merely makes a system call which figures out how to route the packets based on the address and what interface (and therefore IP address) it should bind to. addr() returns an array containing the family (AF_INET), local port, and local address (which is what we want) of the socket.

Share

Leave an answer

You must login to add an answer.

Need An Account,

1 Answer

  1. From coderrr.wordpress.com:

    require 'socket'  def local_ip   orig, Socket.do_not_reverse_lookup = Socket.do_not_reverse_lookup, true  # turn off reverse DNS resolution temporarily    UDPSocket.open do |s|     s.connect '64.233.187.99', 1     s.addr.last   end ensure   Socket.do_not_reverse_lookup = orig end  # irb:0> local_ip # => '192.168.0.127'
    • 0