Kubernetes: Intro

What is Kubernetes?

• Also known as k8s.
• an open-source project.
• orchestration technology for containers.

Container

• Most popular technology: Docker
• run each component in a separate container with its own libraries and dependencies.
• build docker configuration once
• isolated environments as if they can have their own process and services
• like virtual machine, sharing the same operating kernel.
  • Docker can run any flavor of OS on top if the machine’s OS
• Docker utilizes lxc containers.
• The main purpose is to containerize applications and to ship and run them

Operating Systems

• consist of OS kernel and a set of software
• kernel is responsible for interacting with the underlying hardware
• software may consistent of different UI drivers, etc.
• common Linux kernel shared across all operating systems.
• cannot run Windows-based container on a Docker host with Linux OS on it
  • require Docker on a Windows server

Containers vs VM

• VM requires ‘Hypervisor’ and each VM has its own Operating System
• This causes higher cost
• VM uses higher spaces
• Docker containers boot up faster
• Docker has less isolation, VM has complete isolation

Container vs Image

• container: running instance of images, isolated
• image: package or template, used to create one or more containers

Referenes

• Udemy: Kubernetes for the Absolute Beginners