Kubernetes Architecture and Components

Kubernetes is a powerful container orchestration platform that automates the deployment, scaling, and management of containerized applications.

At its core, Kubernetes follows a client-server architecture, consisting of the following primary components:

Master Node (Control Plane): Manages the cluster's state, including scheduling, scaling, and maintaining the desired state.

Worker Nodes: Machines that run containerized applications, managed by the control plane.

API Server

The front-end for the Kubernetes control plane, handling all administrative tasks.

etcd

A distributed key-value store for storing all cluster data, configuration, and state information.

Scheduler

Assigns pods to available worker nodes based on resource requirements.

Controller Manager

Runs controllers to ensure the cluster’s desired state matches the current state (e.g., maintaining the correct number of pod replicas).

Cloud Controller Manager

Integrates Kubernetes with cloud provider APIs for managing cloud resources like load balancers and storage.

Kubelet

An agent on each worker node that ensures containers are running and healthy.

Kube Proxy

Maintains network rules on each node, enabling communication between pods and services.

Pods

The smallest deployable units in Kubernetes, consisting of one or more containers sharing the same network namespace and storage.

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