Kubernetes ports

There are three kinds of ports widely used in kubernetes resource management, for example:
port is the port exposed within the cluster. so other nodes/pods from same cluster can access it through service:port
targetPort is the port exposed from within the pod.
nodePort is the port exposed to outside world. so on public network, it could be accessed as public-ip:nodePort

kind: Service
apiVersion: v1
app: nginx
name: nginx
- port: 443
targetPort: 443
- nodePort: 31234
app: nginx

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