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Enforce SSL with Heroku and DNSimple

Heroku and DNSimple simplify the SSL certificate setup process. The following steps should take about 15 minutes.

Buy the SSL certification from DNSimple

Buy a wildcard certificate from DNSimple. The wildcard (*) allows the same certificate to be used on any subdomains such as api or staging.

Prepare the SSL certificate

Follow the wildcard certificate instructions to get .pem, .crt, and .key files prepared.

Follow these instructions to complete .key preparation, provision the SSL addon from Heroku, and add the certificate to Heroku:

heroku certs:add server.crt server.key

Replace it with:

heroku certs:add *.{pem,crt,key}

Otherwise, we might see an error like:

Updating SSL Endpoint myapp.herokussl.com for [heroku-app]... failed
  !    Internal server error.

Get SSL endpoint from Heroku

Run:

heroku certs

This provides the correct endpoint for the SSL-enabled domain. This is a domain that looks like tokyo-2121.herokussl.com.

Add Heroku SSL endpoint to DNSimple

Next, go to the DNSimple dashboard. Update/add the CNAME record for the SSL-enabled domain to point to e.g. tokyo-2121.herokussl.com.

Prepare Rails app

Edit config/environments/production.rb:

config.force_ssl = true

Deploy that change.

Now, if a user types http://ourdomain.com, they should be redirected to https://www.ourdomain.com and their browser's URL bar should display its appropriate indicator (perhaps a green lock) declaring the SSL certificate is valid.