Environment & Source Control
Heroku is an application platform in the cloud which takes care of managing servers, deployment, and scaling, allowing you to focus your attention solely on your application code. We love deploying code to Heroku because the whole system was built to be easy. There are just a few steps to get going.
Heroku authenticates using SSH keys.
If you’ve used RailsInstaller then it generated and saved SSH keys for you; there’s nothing to do!
MacOS and Linux
If you’re on MacOS or Linux there’s a decent chance you’ve already created a set of SSH keys. Look in
~/.ssh/ and if you see files like
id_rsa.pub then you’re good to go!
If those files aren’t present, generate new keys like this:
If you choose to use a passphrase, you’d better remember it. If you forget it then you can’t use your keys and you might not be able to access important resources like your code and server!
Once that setup completes you’re ready to continue.
Heroku has created a gem (https://github.com/heroku/heroku) that makes it ridiculously easy to interact with their service. If you use Heroku for all your projects, consider adding it to your global gemset (in
~/.rvm/gemsets/global.gems). Here’s how you use it:
$ $ $
Now you’re ready to submit your credentials to Heroku. Start by attempting to list your applications:
You’ll be prompted for your Heroku.com username and password. If you don’t have one, create one: http://www.heroku.com/signup
Once those credentials are entered, you should upload your SSH keys to allow password-less access in the future:
Once that upload completes, you can try
heroku list again and it should complete without asking for a username/password.
Here are some of the most common commands you’ll use on Heroku:
Within the root directory of a project you can use the following
For more information use
heroku help or
heroku help TOPIC (e.g.
heroku help config). You can also check out the full list on Cheat (http://cheat.errtheblog.com/s/heroku/) or install the Cheat gem (
gem install cheat) then display it with
Applications are deployed to Heroku through git. In order to push to Heroku, you’ll need to add it as a remote (repository):
If you don’t know what your "appname" is, you can find it easily:
Now when you’re ready to deploy, simply push to your
You can push any number of branches to Heroku:
This will create a new "remote" branch in your
heroku repository. The
my_topic_branch:my_topic_branch bit means "push my local branch named ‘the-branch-name -before-the-colon’ and name it ‘the-branch-name-after-the-colon’". Most often when you push remote branches those two names will be identical.
Importantly, only the
master branch on your
heroku remote triggers deployment. All other branches are essentially ignored by Heroku.