S3とCloudfront - セットアップが機能しない

[Arkshine]

@zogstrip

Discourse configuration

Now that you’ve properly set up S3, the final step is to configure your Discourse forum. These instructions should work, but the preferred method is to use environment variables and a CDN as described in Configure an S3 compatible object storage provider for uploads .

I believe you can get an overview of what environment variables you need here:
Configure an S3 compatible object storage provider for uploads

EDIT: In the context of a rake command, see the answer below