Kubernetes Services: ClusterIP, NodePort & LoadBalancer

In this video, we will break down three key Kubernetes service types: ClusterIP, NodePort, and LoadBalancer, and explain how they help route traffic to your applications within and outside the cluster.

ClusterIP (Internal Service):

- ClusterIP creates a private, internal-only IP address for services within the Kubernetes cluster. It is ideal for backend services and databases that should not be externally exposed. We will explore how kube-proxy uses iptables or IPVS to manage internal routing between Pods.

LoadBalancer (External Service with Cloud Provider):

- LoadBalancer integrates with your cloud provider (like AWS or GCP) to expose your services externally via a cloud load balancer. We will cover how traffic flows from the load balancer to a NodePort, and from there, how kube-proxy forwards requests to the right Pods.

NodePort (Expose Port on Each Node):

- NodePort opens a static port on each node in your cluster, allowing external traffic to hit any node and be forwarded to the service and Pods. We will explain how NAT rules work with kube-proxy, and where NodePort fits in scenarios like on-premise setups.