If your domain name is registered with Gandi, please start by checking that:
@ 10800 IN A [IP address of your server]
* 10800 IN A [IP address of your server]
On the right-hand side of the domain name's control panel, you will see “Gandi Cloud VPS Hosting”. Click on “Manage”:
On the following screen, you will be able to specify the Gandi Cloud VPS server that you want the domain to point to. Select the server that you want to connect your domain or subdomain to (by default the subdomain “www” is added, so remember that if your virtualhost on your server is just the domain you must leave it empty).
You will then see a confirmation page, where you can “Submit” or add/edit subdomains to point to the server.