About Kubernetes Service discovery

Kubernetes Service Discovery has two ways of environment variables and DNS

The way of environment variables

In the way of environment variable, SVC must be started before RC, otherwise the cluster IP-related environment variables of this SVC will not be available in other pod.

How DNS is

DNS must be started, then the resolve.conf file in the container in the pod that is started will take Kube-dns as nameserver.

The way kubernetes exposes nodes

Configure the type = Nodeport setting in Svc.yaml

Configure the type = loadbalance setting in Svc.yaml