メインドメインにインストールできません。どうしたのでしょうか？

[awesomerobot (Kris)]

このガイドを見ましたか？要するに、すべてのDNSプロバイダーがDiscourseをルートドメインでホストできるわけではないということです。

Configure your hosted Discourse site to run at the root or apex domain (e.g. example.com)

Most hosted discourse instances are on a subdomain: forum.example.com talk.example.com www.example.com This is our general recommendation in almost all cases, and it works great. However, if you wish to use a root domain or apex domain for your hosted discourse, like so example.com this turns out to be surprisingly difficult in a hosting scenario, due to the vagaries of how DNS works. It is possible, however, you must use a DNS provider that specifically supports it! DNS pro…