Ingress in Kubernetes is an API object that manages external access to services within a cluster, typically HTTP and HTTPS. It acts as a reverse proxy, routing traffic from outside the cluster to the appropriate backend services based on rules defined in the Ingress resource. Ingress simplifies exposing multiple services through a single IP address and provides features like TLS termination, name-based virtual hosting, and path-based routing.
Here's a breakdown of the key concepts and how Ingress works:
Purpose of Ingress:
Centralized access point: Ingress provides a single entry point for external traffic, allowing you to manage access to multiple services through a single IP address or domain name.
Name-based virtual hosting: Ingress allows you to host multiple applications on the same IP address using different hostnames.
Path-based routing: Ingress allows you to route traffic to different services based on the URL path.
TLS termination: Ingress can handle TLS termination, offloading the encryption and decryption process from the backend services.
Load balancing: Ingress can distribute traffic across multiple backend Pods, providing load balancing and high availability.
Components of Ingress:
Ingress Controller: An Ingress controller is a specialized controller that watches for Ingress resources and configures a reverse proxy (e.g., Nginx, HAProxy, Traefik) to route traffic according to the Ingress rules. You need to deploy an Ingress controller in your cluster to use Ingress.
Ingress Resource: An Ingress resource defines the rules for routing traffic from outside the cluster to the backend services. It specifies the hostnames, paths, and backend services to use.
How Ingress works:
The client sends an HTTP or HTTPS request to the Ingress controller.
The Ingress controller inspects the request's hostname and path.
The Ingress controller matches the request against the rules defined in the Ingress resource.
The Ingress cont....
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