Service Port

Here's the most important attributes:

1. name - string

   • The name of this port within the service, must be a DNS_LABEL. All ports within a ServiceSpec must have unique names.
   • Optional if only one ServicePort is defined.

2. nodePort - integer

   • The port on each node on which this service is exposed when type is NodePort or LoadBalancer. Usually assigned by the system.
   • If specified, the value must be in-range and not in use, otherwise the operation will fail.
   • If not specified, a port will be allocated if required.
   • This field is cleared when updating a Service to no longer need it (e.g., changing type from NodePort to ClusterIP).

3. port - integer

   • The port that will be exposed by this service.

4. targetPort - integer | string

   • The port number or name to access on the pods targeted by the service. Number must be in the range 1 to 65535.
   • Name must be an IANA_SVC_NAME. If specified as a string, it will be looked up as a named port in the target Pod's container ports.
   • If not specified, the value of the port field is used.
   • This field is ignored for services with clusterIP=None, and should be omitted or set equal to the port field.