问题
I created a rails app and have successfully deployed it to DigitalOcean. Every time I make a deployment, the port changes. First question, how do I get it to stop, and how do I get my application to respond to port 80 so I can hit it from the outside world without specifying the port number? Part of me wants to go back to heroku and just pay more because I don't get these headaches...
回答1:
Unless you configure Dokku to use your domain name, it will serve the app at a random port.
Put your root domain name in the file /home/dokku/VHOST From the Dokku docs:
If this file still is not present when you push your app, dokku will publish the app with a port number (i.e. http://example.com:49154)
回答2:
I had to enable VHOSTS for my app:
domains:enable <app>
See http://dokku.viewdocs.io/dokku/configuration/domains/#domain-configuration
来源：https://stackoverflow.com/questions/27497928/rails-dokku-deployments-to-digitalocean-receives-random-ports