If you use virtual hosts and have had to test your site on a variety of devices you know it can be a pain. On a desktop or laptop you can edit your hosts file to route requests to the correct IP, but how can you do this on iPads, iPhones, etc.? Luckily 37signals has released a free DNS service called xip.io that makes this really easy.
The best way to show how xip.io works is by example. From the xip.io website:
10.0.0.1.xip.io resolves to 10.0.0.1 www.10.0.0.1.xip.io resolves to 10.0.0.1 mysite.10.0.0.1.xip.io resolves to 10.0.0.1 foo.bar.10.0.0.1.xip.io resolves to 10.0.0.1
So if you have a virtual host for "mysite", in apache you can add the following server alias to your virtual host configuration:
After restarting apache you can visit http://mysite.10.0.0.1.xip.io from any device and the IP should be resolved correctly to 10.0.0.1.
For more info on xip.io and a link to the github page visit http://xip.io/.
Hopefully this will make testing your concrete5 sites that use a virtual host easier!