Get hostname from Rails controller

Question

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?

score 99 · Answer 1 · answered Jun 22 '10 at 23:03

99

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

answered Jun 22 '10 at 23:03

Wilhelm

6,506
5
30
26

1

this is helpful for if you are trying to parse URL's and such, but I think this particular question pertains to the actual name of that machine or OS. – taelor Sep 22 '11 at 18:11
this wont help you if you want to get the internal name of the host – phoet Nov 01 '11 at 09:30

Wayne Conrad · Accepted Answer · 2018-03-23T19:27:15.230

31

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.

edited Mar 23 '18 at 19:27

answered Feb 05 '10 at 17:26

Wayne Conrad

103,207
26
155
191

1

It doesn't look like the first line is needed any more on Rails 4. – ohaleck Mar 23 '18 at 14:48
@ohaleck Thank you for pointing that out. I've amended the answer. – Wayne Conrad Mar 23 '18 at 19:27

score 9 · Answer 3 · answered Feb 06 '10 at 03:46

9

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.

answered Feb 06 '10 at 03:46

btelles

5,390
7
46
78

8

If you're going to do this I'd recommend caching the value via an initializer, and not doing a fork() for each request. – George Armhold Jun 14 '12 at 02:30
Works on Mac OS as well. – calasyr Sep 16 '16 at 20:54
Shelling out when you don't need to in general is considered bad practice. – Meredith Oct 06 '19 at 22:28

webaholik · Answer 4 · 2018-10-26T16:18:06.553

2

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

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

edited Oct 26 '18 at 16:18

answered Oct 26 '18 at 16:12

webaholik

1,619
1
19
30

Get hostname from Rails controller

4 Answers4

Linked