Running the server
Normally, we run our new rails websites in a terminal window. However, if rails
is running, we can't run other commands! If a terminal is running your server
with rails server, it won't accept any other commands. You should open a new
terminal tab to run the server, so you can continue to run commands in your
first terminal tab.
On the bottom of your editor is the console window. If you don't see the console
window, click View > Console from the top menu.
Click the small green (+) icon, and then click New Terminal.
Now you can run rails server here, and still issue commands in your first tab.
http://localhost:3000 doesn't work in Cloud9
Because Cloud9 is a cloud environment, the server is running on Amazon, not
your computer. Wherever you see instructions to visit http://localhost:3000,
you should instead visit your personal Cloud9 preview URL. Here's how:
First, make sure your server is running.
From the top menu, click Preview > Preview Running Application.
A small window will appear to the right of the console. Click the indicated icon
to pop out the preview to a new browser tab.
You can now click the small x next to the preview tab to close it. Switch
to your new browser tab.
You will now be at your personal preview URL, and it will have the form:
https://0881115cc5c34e93aba4a4cd03b99438.vfs.cloud9.us-east-1.amazonaws.com
Initially, it should look something like this:
Whenever instructed to go to a URL beginning with http://localhost:3000,
you should replace http://localhost:3000 with your personal preview URL.
Images from Michael Hartl's Ruby on Rails Tutorial.