I have an application that is internal and exposed only to other application on the cluster by a service with cluster IP. Other services are accessing this application via it's DNS (serviceName-namespace.svc.cluster.local). This application handles sensitive data, so although all the communication is inside the cluster I would like to use TLS to secure the communications to this application.
My question is - how can I enable TLS on a service? Is there something already exist or should I handle it on the application code? Also, is there already a CA I can use on the cluster that can sign certificates for .svc.cluster.local?
To clarify, I know I can use ingress for this purpose. The only problem is keeping this service internal only - so only services inside the cluster will be able to access it.
Thanks, Omer
I just found that Kubernetes API can be used to generate a certificate that will be trusted by all the pods running on the cluster. This option might be simpler than the alternatives. You can find the documentation here, including full flow of generating a certificate and using it.