Teaching How to Generate Wildcard SSL Certificates for your LBaaS

Security is super important, but also annoying. From a backend developer mindset, all I want is to build great services exposed as APIs that the world can consume with ease. The problem is that in most cases, consumption of my endpoints will be blocked by browsers and other tools/client unless they are exposed as HTTPS with valid SSL certificates.

In this blog, I am going to show you how to use Let’s Encrypt to create your own “Wildcard SSL Certificate” for your existing domain, for example: *.mydomain.com – Then I am going to show you how to assign this certificate to your Oracle LBaaS Listener endpoint.

For these steps, I am using an Ubuntu VM. Feel free to adapt the instructions if you are using a different OS.

  • First, let’s Setup pre-requisites:
    sudo apt-get update
    sudo apt-get install python-minimal
    python –version
      • I got: Python 2.7.6
  • Setup Certbot:
    mkdir $HOME/mycerts && cd $HOME/mycerts
    git clone https://github.com/certbot/certbot.git
    cd certbot && ./certbot-auto
  • Genereate the wildcard SSL certificate
./certbot-auto certonly \
--manual \
--preferred-challenges=dns \
--email YOUREMAIL \
--server https://acme-v02.api.letsencrypt.org/directory \
--agree-tos \
  • You have to add a TXT domain record into your domain for verification purposes. Go to your DNS service and create a DNS TXT record under the name:

    For example:

    _acme-challenge.YOUR_DOMAIN with the provided value.

  • Once you have created the TXT record, give it some time to let root DNS servers refresh and then click Enter to continue.
  • Congratulations, your certificate is ready:

  • Verify them:

    cd $HOME/mycerts/certbot

    ./certbot-auto certificates

  • Now, let’s add our certificate to our Oracle LBaaS endpoint.
  • Go to LBaaS and add your certificate:

  • Give it a name. Then copy from your just generated certificates and paste the full chain into Certificate and also paste your private key into Private key. Click Add certificate when done.


  • Adding full chain certificate and private key to LBaaS:

  • Your certificate should be enabled:

  • Now, let’s enable the certificate into the Listeners. In the left menu, under Resources, click on Listeners

  • Select the listener that you want to enable SSL on. In my case it is my listener on port 80. Hove over the three dots on the right and select Edit Listener

  • Select “Use SSL” and make sure you point to the Certificate that you previously created. When done, click Submit.

  • Make sure your request is accepted and then proceeds to Succeeded.

  • Try any of your URL endpoints under the domain that you cert-authenticated (i.e. *.yourdomain.com) in the browser.

    They will now be available as HTTPS valid certificates!!!! How cool is that?

Congratulations!!! Your REST APIs are now exposed as SSL with valid certificates.

I hope you found this blog useful. If you have any question or comment, feel free to contact me directly at https://www.linkedin.com/in/citurria/

Huge thanks to Saurabh Palande, for providing insight into how to use Let’s Encrypt to generate the valid SSL certificate. Feel free to read his blog here.

Thanks for your time.


Author: Carlos Rodriguez Iturria

I am extremely passionate about people, technology and the most effective ways to connect the two by sharing my knowledge and experience. Working collaboratively with customers and partners inspires and excites me, especially when the outcome is noticeable valuable to a business and results in true innovation. I enjoy learning and teaching, as I recognise that this is a critical aspect of remaining at the forefront of technology in the modern era. Over the past 10+ years, I have developed and defined solutions that are reliable, secure and scalable, working closely with a diverse range of stakeholders. I enjoy leading engagements and am very active in the technical communities – both internal and external. I have stood out as a noticeable mentor running technology events across major cities in Australia and New Zealand, including various technology areas such as, Enterprise Integrations, API Management, Cloud Integration, IaaS and PaaS adoption, DevOps, Continuous Integration, Continuous Automation among others. In recent years, I have shaped my role and directed my capabilities towards educating and architecting benefits for customers using Oracle and AWS Cloud technologies. I get especially excited when I am able to position both as a way to exceed my customers’ expectations. I hold a bachelor degree in Computer Science and certifications in Oracle and AWS Solutions Architecture.

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