Let's say you are developing a new App and want to use your custom domain before actually routing it to fortrabbit. Just add the domain to fortrabbit, as you would do with any actually routed domain, then modify your local hosts file, which lets your local machine know ahead of time that the domain is to be served from your fortrabbit App.
The hosts file is a text file (without file type ending). It can be found here:
- MacOS & Linux:
Your local file contains many entries: do not edit those. Just add a new line with the IP of your App and the domain you want to see routed there like so:
# pattern (how it works) [your App's IP address] [your fully qualified domain name] # example (what it looks like) 18.104.22.168 mydomain.com www.mydomain.com
Please bear in mind that you'll only check the routing with the IP of the App not the actual CNAME routing here. CNAME entries are not allowed in the hosts file.
After your domain has been moved/propagated be sure to remove the entry from your hosts file.