Get hostname from Rails controller

I am trying to get the hostname of the machine which a rails application is running on from the controller.

What would be the best way to do this taking into account it should work on both windows and linux?

Solution 1:

All you have to do is look at the request object in your controller:

request.host_with_port

or if you don't want the port, just

request.host

Solution 2:

There's always:

require 'socket'
...
Socket.gethostname

I've got no Windows box handy with which to test this, but the docs make no mention of it being *nix specific.

Note: The require statement is not necessary for Rails 4, and probably other Rails versions as well. It is required if you are doing plain Ruby without Rails.

Solution 3:

Use backticks and the command hostname

current_host = `hostname`

This sends the command to the shell, and returns the hostname. Works on at least: Debian Linux, Windows, Solaris.

Solution 4:

If you need the full domain path from protocol to port, try:

full_domain_path = request.env['rack.url_scheme'] + '://' + request.host_with_port