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A Practical Guide to Kubernetes

Sequential Breakdown of the Process

Explore the step-by-step process of creating a Kubernetes Service and how it facilitates stable communication among Pods. Understand the roles of key components such as the API server, endpoint controller, kube-proxy, and kube-dns in managing Service objects, endpoints, and network traffic. This lesson helps you gain clarity on how Services expose Pods inside and outside the cluster using NodePort and selectors for effective deployment.

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The sequence

The processes that were initiated with the creation of the Service are as follows:

  1. Kubernetes client (kubectl) sent a request to the API server requesting the creation of the Service based on Pods created through the go-demo-2 ReplicaSet.

  2. The endpoint controller is watching the API server for new Service events. It detects that there is a new Service object.

  3. The endpoint controller creates endpoint objects with the same name as the Service, and it uses the Service selector to identify endpoints (in this case, the IP and the port of go-demo-2 Pods).

  4. The kube-proxy is watching for Service and endpoint objects. It detects that there is a new Service and a new endpoint ...