I deployed a kubernetes loadbalancer on google cloud.
$kubectl expose deployments nginx --port 80 --type LoadBalancer
$kubectl get services
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
kubernetes ClusterIP 10.31.240.1 <none> 443/TCP 9m
nginx LoadBalancer 10.31.253.32 35.188.14.5 80:30787/TCP 1mNotice the nginx port has 80 and 30787. What does these two ports mean?
Notice the nginx port has 80 and 30787. What does these two ports mean?
A kubectl describe service nginx would likely be more explanatory, but the tl;dr is that 80 is the port from inside the cluster, and 30787 is the NodePort pointing to port 80 of that Service. The NodePort is required because in order for whatever load balancer is running on 35.188.14.5 to connect into the cluster, it needs a TCP/IP port that it can use, since it (hopefully!) cannot use 10.31.253.32:80 to otherwise communicate with that Service the way things inside the CNI boundary do.