A. Because Ingress can expose ports or protocols, it is easier to access Ingress than Service.
B. If you need to use the Ingress function, you must first install the Ingress Controller on the Kubernetes cluster
C. You can set an external domain name in the Service, then access the Ingress through the domain name, and then access the backend service
D. Ingress is a containerized object that manages external access to services in the cluster. The typical access method is SS