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A journey of writing my own Kubernetes
- The author of this article outlines their journey of creating their own Kubernetes and shares some key points and flow they met during development.
- They explain that to truly understand how a program works, you need to learn how it is built and try to write it yourself.
- They share some prerequisites and a disclaimer before sharing code and demonstrating a running node with kubelet and three pods with a node port service on it.
- They explain how a watcher-listener action is implemented in Kubernetes and point to the source code for more details on the pods and watcher-listener creations.
- The author then spends more time detailing the creation of the iptables chain of services, with the creation of a ClusterIP service and then a NodePort service.
- They explain the creation of endpoints that “point” to a pod and how the kube-proxy listens to new services and endpoint creations, creating a new IPTables chain that masquerades and loads the requests to the pods based on a service selector for load balancing.
- They also mention that the kube-proxy has another listener that matches existing endpoints to actions like when an existing pod fails or is deleted and deletes the address in the endpoint.
- The author advises readers to go into more detail by exploring the source code under pkg/kube-proxy section.
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