[Docker 배우기] Section 1. Introduction

Docker for the Absolute Beginner - Hands On - DevOps | Udemy

Docker Overview

Docker allows to run each service with its dependencies in separate containers.

Containers: a completely independent environment that runs on OS kernels

• ex) Linux kernel: allows to run CentOS, Fedora, etc
• Cannot run Windows container on Linux kernel

VM vs Containers

 

VM	Container
Uses Hypervisor	Uses container engine
Multiple OS	Single OS
Heavy Utilization and Size	Light in size and utilization
Slow Booting	Fast Booting
Resources are independent	Resources can be shared

 

 

Containers and VMs can be used together to use the good side of both.

 

 

Docker image: template of container

• Like a class in programming
• Can be pushed to the Docker Hub for public availability
• Guarantees the environment runs in the same way everywhere

Docker container: instances of image

• Like objects in programming

Docker can be installed by following the instructions below.

Install Docker Engine | Docker Docs