Kubernetes networking is an essential aspect of Kubernetes architecture and enables communication between the various components of a Kubernetes cluster. It provides a way for containers running on different nodes to communicate, for services to discover and communicate with each other, and for external traffic to be routed to services running within the cluster.
Kubernetes networking provides a highly scalable and reliable network infrastructure that enables the communication between pods, services, and external traffic in your product engineering efforts.
This blog will discuss how to configure services and ingress in Kubernetes.
Kubernetes is an open-source container orchestration platform designed to automate containerized applications’ deployment, scaling, and management.
It lets developers package their applications and dependencies into containers, which can be easily deployed and run on any Kubernetes-compatible infrastructure.
A Kubernetes service can be defined as a group of pods. It is defined as an abstraction on the top of the pod which provides a stable IP address and DNS name by which pods can be accessed.
It helps pods scale significantly, and the load balancer is easy. It allows clients to access the pods without knowing their IP addresses. Services can be defined in Kubernetes using the YAML or JSON format.
To create a service in Kubernetes, you need to define the following fields:
Example of configuring a service:
In this example, we are creating a service named my-service that will route traffic to pods labeled with the app: my-app. The Service exposes port 80 and routes traffic to container port 8080.
Kubernetes supports four types of services:
Kubernetes provides built-in service discovery using DNS. Each Service is assigned a DNS name based on the service name and namespace. Clients can access the Service using the DNS name.
Ingress is a Kubernetes resource that provides a way to route traffic from external sources to the applications running in the Kubernetes cluster. Using ingress, We can maintain the DNS routing configurations. The ingress controller does the routing by reading the routing rules from the ingress resource.
We must understand the two concepts here:
We can map the external DNS traffic to the internal Kubernetes service endpoints. It requires an ingress controller for routing the rules specified in the ingress object.
Example of creating an Ingress:
The above declaration means that all calls to test.apps.example.com should hit the Service named hello-service residing in the dev namespace.
In Kubernetes, services, and ingress allow you to expose and route traffic to your application running in containers.