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Tech Document Sep 25, 2018

How to Install Certificates on Heroku Server

This article will go into detail on how to install certificates on Heroku Server.

SSL Installation Heroku

All we need to have is the certificate and private key for SSL installation.

SSL configuration on Heroku depends slightly on where you are deploying your application.

Create the addon

It is required only if you app in common Runtime. Else you can skip this step.

$ heroku addons:create ssl:endpoint

Adding Certificate, Intermediate and Private key

We need to combine the certificate and the bundle to a single .crt file.

cat domain_com.crt > server.crt

Add your certificate, any intermediate certificates, and private key to the endpoint with the certs:add command.

Heroku automatically strips out unnecessary parts of the certificate chain as part of the certs:add command. In some scenarios, this may not be desired.

$ heroku certs:add server.crt server.keyAdding SSL Endpoint to example... done

The endpoint URL assigned to your app will be listed in the output, in this example. Visiting this URL will result in a "no such app" message – this is expected. Read further for proper verification steps.

For apps in the Common Runtime, the endpoint domain name will vary depending on region. The US region will have a name in the form of Apps in the EU region will have the same domain name as your app’s herokuapp domain, e.g. Apps in Private Spaces will have a name in the form of In all cases, the output of the certs:add command will accurately reflect this.

To Verify the Configuration

$ heroku certs

For obtaining detailed information about Certificate use certs:info

$ heroku certs:info

DNS and Domain Configuration

Once the SSL endpoint is provisioned and your certificate is confirmed, you must route requests for your secure domain through the endpoint URL. Unless you’ve already done so, add the domain specified when generating the CSR to your app with.

$ heroku domains:add

Added to example... done

To do an installation check

Use a command line utility like curl to test that everything is configured correctly for your secure domain.

curl -kvI

You can update a certificate using the certs:update command with the new certificate and the new or an existing private key:

$ heroku certs:update server.crt server.key Updating SSL Endpoint endpoint for example... done


If, for some reason, the new certificate is not working properly and traffic to your app is being disrupted, you can roll back to the previous certificate:

$ heroku certs:rollback
Rolling back SSL Endpoint endpoint on example... done

Remove Certificate

You can remove a certificate using the certs:remove command:

$ heroku certs:remove Removing SSL Endpoint endpoint on example... done

Removing a certificate will remove the SSL endpoint so any domain names pointing to it will stop working.