How to use a custom domain name with FP Haskell Center

As of March 2020, School of Haskell has been switched to read-only mode.

To use a custom hostname that is not a subdomain of (e.g.,, you are responsible for configuring the Internet's Domain Name System (DNS) to translate your domain name to the IP address of the server running your app. While a complete tutorial on DNS is beyond the scope, the requirements are:

  • Register your 2nd-level domain (e.g., name with a registrar for your top-level domain (e.g. .com).

  • Have a name server. Many registrars will include a name server with registration, or use a third-party DNS hosting service.

  • On your name server, create a resource record with fields:

    • Name: Your custom hostname (e.g.,
    • Type: CNAME (sometimes known as an alias)
    • Value: the host name of your app server as displayed on the deployment manager's server details page. To reach the server details page, visit the deployment manager and select your app server. The host name will look like (for shared app servers) or (for dedicated EC2 app servers), with different random numbers.

Then, enter your custom hostname (e.g., in the hostname field of the IDE's deployment configurations tab, and deploy your app.

Subdomains of

Using a custom hostname which is a subdomain of is simple: enter the hostname you want (e.g. in the hostname field of the IDE's deployment configurations tab, and it will work automatically after you deploy. Note that each customer is limited to five of these custom subdomains at a time per app server license.