An ingress resource is the core Kubernetes object that routes external HTTP and HTTPS traffic to services inside your cluster. It defines rules, hosts, and paths, and works with a load balancer to distribute requests efficiently. Together, ingress resources and load balancers control how your applications scale, how they stay reachable, and how they protect themselves against overload.
A load balancer takes incoming network traffic and spreads it across multiple backend pods. It keeps connections stable, removes bottlenecks, and ensures failover when one endpoint goes down. In Kubernetes, this can be implemented using cloud provider–managed load balancers or via bare-metal solutions. Pairing a robust load balancer with clear ingress rules is essential for high availability and predictable performance.
To configure an ingress resource, you define an Ingress YAML manifest with metadata, spec rules, and backend services. The ingress controller—NGINX, Traefik, HAProxy, or a cloud-native option—reads these rules and programs the load balancer accordingly. Proper annotations can enable TLS termination, custom timeouts, path rewriting, and advanced routing logic.