Hi Everyone,
Today we will be going through Kubernetes’ in-depth architecture.
The first question one should ask is: What is Kubernetes and why did we even need it?
What is Kubernetes ?#
Kubernetes is a container orchestration platform that helps manage containers.
It is a distributed system that enables containers to automatically scale, self-heal, and manage the full lifecycle of production applications.
Why did we even need it ?#
Before Kubernetes deploying and managing application in container at scale was very difficult task.
Advantages of using kubernetes:
- High Availablity & Scalability: Application scale up/down automatically based on cpu/memory or custom metrics.
- Declarative Infrastructure: Define how many instance of application should be deploy via yaml files.
- Vendor Agnostic: Can be deployed on any public cloud or private cloud, means no vendor lock-in.
- Service Discovery & Load Balancing: Comes with internal dns for service discovery. In public cloud can deploy loadbalancer for traffic management.
- Open Source Ecosystem: Kubernetes is opensource which comes with many other opensource tools for enhancing lifecycle of applications.
K8S is mainly divided into two parts: Control Plane and Data Plane
Control Plane: It is a brain of k8s, where all main components like api-server, scheduler, controller-manager etc are deployed.
Data Plane: It is where all the application workloads are running, it consists of worker nodes which runs pods.
