https://www.learnitguide.net/2020/05/kubernetes-services-explained-examples.html
https://www.bmc.com/blogs/kubernetes-port-targetport-nodeport/#:~:text=Port%20configurations%20for%20Kubernetes%20Services&text=Port%20exposes%20the%20Kubernetes%20service,pod%20will%20be%20listening%20on.