Understanding Kubernetes: Part 13 -Services

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Last updated 4 months ago

Understanding Kubernetes: Part 13 -Services

If you’ve been following our Kubernetes series 2025, welcome back! For new readers, check out Part 3:

What is a Service in Kubernetes?

A Kubernetes Service is a way to expose a group of Pods and provide a stable IP and DNS name for accessing them. It enables communication within your application or with the outside world.

For example:

If you have a backend service and need a reliable way for the frontend to communicate with it, a Service ensures that the backend Pods can be accessed via a stable IP or DNS name, even if individual Pods are recreated or fail.

Service Capabilities:

Stable Network Identity: Provides a fixed IP and DNS name to a group of Pods.
Load Balancing: Distributes traffic evenly across the Pods it manages.
Pod Discovery: Automatically discovers and routes to Pods that match its selector labels.

Types of Services:

ClusterIP: Exposes the Service internally within the cluster.
NodePort: Exposes the Service on each node’s IP at a static port.
LoadBalancer: Exposes the Service externally using a cloud provider’s load balancer.
ExternalName: Maps the Service to an external DNS name.

In my previous role:

As a Senior DevOps Engineer, I used Services to expose a set of microservices for an e-commerce platform. For instance, I deployed a frontend application that communicated with multiple backend APIs through ClusterIP Services. These Services handled internal traffic routing and ensured seamless communication, even when backend Pods scaled or restarted. Additionally, I utilized ExternalName Services to enable secure connections to external third-party APIs, simplifying configuration and improving system reliability.

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