Describe the request path from Ingress to pod. What components are involved?

The request path from Ingress to a pod in Kubernetes involves several key components:

1. Ingress Controller — accepts external HTTP/HTTPS requests, analyzes routing rules (Ingress Resource), and determines which service to direct the request to.

2. Service — an abstraction that provides a stable IP and DNS name for a group of pods. Ingress directs the request to the appropriate service.

3. Endpoint — a set of IP addresses of pods that serve the service.

4. kube-proxy — on each node, responsible for routing traffic to the correct pod using iptables or IPVS rules.

5. Pod — the final recipient of the request, where the application container runs.

Final path: Ingress Controller → Service → kube-proxy → Pod

For example, when an external request arrives at the Ingress Controller, it checks the rules, selects a service, the service directs to one of the pods, and the request is processed by the application inside the pod.