Testing with Kubernetes ConfigMaps, Secrets, Ingress, and cert-manager

With the preceding changes described, we are ready to test the system landscape with the Spring Cloud Config Server and the Spring Cloud Gateway replaced by Kubernetes ConfigMaps, Secrets, an Ingress object, and cert-manager. As before, when we used the Spring Cloud Gateway as the edge server, the external API will be protected by HTTPS. With this deployment, it will be the Ingress controller that uses the certificate provisioned by cert-manager to protect the external API with HTTPS. This is illustrated in the following diagram:

Figure 17.3: Protecting external access using HTTPS

The Ingress controller is exposed on the default HTTPS port, 443, on the Minikube instance. On the host, where we run the Minikube instance as a Docker container, we communicate with the Minikube instance via localhost. When the Minikube instance was created, port forwarding was configured from port 8443 on localhost to the...