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Kubernetes Introduction

Links: - 110 Kubernetes Index
- 111 KodeCloud Index

Introduction

  • Kubernetes is an open source container orchestration tool which was originally developed by google.
  • It helps us manage containerised applications in different deployment environments.
  • It also works on the concept of current state and the desired state just like docker-compose.
    • The state specified in some configuration yaml file is the desired state.
Kubernetes is also known as k8s

The reason being professionals are lazy and there are 8 letters between k & s in Kubernetes.

  • Since k8s deals with containerised applications it supports several runtimes such as docker, cri-o and containerd.
    • This also means that k8s can be utilised without docker as well since it supports other container runtimes.

Features of k8s

  • Automatic deployment of the containerised applications across different servers.
  • Distribution of the load across multiple servers.
  • Auto-scaling of the deployed applications.
  • Monitoring and health check of the containers.
  • Automatic replacement of the failed containers.

Basic Architecture

  • K8s basic architecture consists of master and the worker nodes.
  • We can have more than one master to have a more reliable setup.
  • Nodes are physical or virtual machines.

  • Architecture Diagram: ^351f54

    • attachments/Pasted image 20230515143826.jpg

  • Cloud controller manager which comes into play when you are using a k8s cluster hosted on a specific cloud provider.

The worker nodes need container runtime, kubelet and kube-proxy installed on them.
  • Some responsibilities of the master node
    • Entrypoint to K8S cluster
    • Keeps track of whats happening in the cluster
    • Ensures Pods placement
kube-apiserver is the entry point through which we talk to the cluster.

Last updated: 2023-05-15