![]() Within a cluster, Kubernetes uses IP proxy techniques to ensure that traffic intended for a Service is routed to one of the concerned Pod container instances. To solve this, Kubernetes created the “Service” abstraction: a Service is the external interface to a logical set of Pods. So, this leads to a problem: if one set of Pods (imagine a frontend Pod) needs to communicate with another set of Pods (image a backend Pod), how do the frontends find out and keep track of which IP address to connect to as container instances come and go? ![]() So, the set of Pod container instances running at one moment in time can be different in the next moment. Pods are also dynamic: they are created and destroyed to reflect the state of the cluster and workload requirements. Pods are the smallest unit of application computing in Kubernetes: they represent a small, highly cohesive unit of an application. Why Kubernetes Ingress was created: The routing problem explained Kubernetes Ingress was created to make this easy: it is a Kubernetes API object that maps an application to a stable, externally addressable HTTP or HTTPS URL. However, external clients that reside outside the cluster need a stable and routable IP endpoint to communicate with the service. Ingress was created to solve a routing problem in Kubernetes: an application service runs within a cluster on one or more container instances, which use virtual IP addresses for “cluster internal” communication. Kubernetes Ingress is an API object that describes the routing rules for traffic (typically HTTP or HTTPS) into an application running within a Kubernetes cluster. Using Kubernetes Ingress to route traffic to multiple hostnames at same IP.Using Kubernetes Ingress to terminate SSL / TLS. ![]() Using Kubernetes Ingress to load balance traffic.Using Kubernetes Ingress to expose Services via externally reachable URLs.Differences between Kubernetes Ingress, NodePort and Load Balancers.
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