Kubernetes has four Service types, and they differ in how clients reach the Service:
- ClusterIP, the default, gives the Service an internal IP that works only inside the cluster.
- NodePort also opens a static port on every node's IP, from
30000-32767by default, for clients outside the cluster. - LoadBalancer also provisions the cloud provider's load balancer in front of the Service.
- ExternalName makes cluster DNS return a CNAME for an external hostname, with no proxying.
Setting clusterIP: None makes a headless Service. DNS then returns the Pod IPs instead of one virtual IP, and StatefulSets use it to give each Pod its own DNS name.
# NodePort Service
apiVersion: v1
kind: Service
metadata:
name: my-service
spec:
type: NodePort
selector:
app: myapp
ports:
- port: 80
targetPort: 8080
nodePort: 30007
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