CONTAINERS / A CONCEPT NOTE
Kubernetes Ingress
routing external traffic to services inside your cluster
Overview · mechanism
pitfall · examples
01 / THE SHORT VERSION
The idea in a few sentences.
An Ingress is a Kubernetes resource that exposes HTTP/HTTPS routes from outside the cluster to services inside. Instead of creating a LoadBalancer for every service, you create one Ingress that routes requests based on hostnames (api.example.com) and paths (/users, /orders) to different backend services.
02 / FOLLOW THE MECHANISM
How an ingress routes traffic
External client
sends
GET https://api.example.com/usersto the Ingress controller's IP.Ingress controller
terminates TLS, examines the
Hostheader and path.Controller
matches against Ingress rules —
Host: api.example.com+ path/users→service: user-svc, port: 8080.Service
forwards the request to an available pod matching the service's selector labels.
04 / COMMAND NOTES
Read the command, then the result.
Inspect the flags and arguments before trying an example. Snippets can need local setup, replacement values, or resources in your own environment.
list all ingress resources
kubectl get ingress -Ashow routing rules and TLS config
kubectl describe ingress my-ingress05 / CHECK YOURSELF
Could you explain Kubernetes Ingress to a teammate?
Try it out loud in two sentences: what it is, and the one detail that changes the picture. If you stall, the gap is the part to reread.
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