What do you want to run on the second domain? If it’s Discourse, you’ll have to install a second instance (or use multisite), and have a second, similar configuration file. If it’s something different, the configuration will be different, of course 
What do you want to run on the second domain? If it’s Discourse, you’ll have to install a second instance (or use multisite), and have a second, similar configuration file. If it’s something different, the configuration will be different, of course