Docker

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✅ Docker

• Docker enables developers to package applications & system tools & dependencies into containers and this container makes it possible on different servers, machines.

• The main difference between VM(Virtual Machine) and Docker is whether it has its own OS or not.
• The most popular Container Engine is "Docker"

Docker file (Build) ==> Image ==> Container

✅ Building Containers

• Dockerfile / Image / Container

"Dockerfile" : How to make a "Container"

• copy files
• install dependencies
• set environment variables
• run setup scripts

"Image": It contains all of our executed application information. (kinda class in OOP)

"Container": It enables to run(execute) the image file in an isolated environment

✅ Public & Private

"Public"

• DockerHub
• RED HAT
• Github Packages

"Private"

• AWS
• Google Cloud
• Microsoft Azure

✅ Github vs Docker hub

• Github is a code repository
• Docker hub is a software repository

✅ Dockerfile vs Docker-compose

: Docker commands are focused on only one container(or image) at once while docker-compose manage several containers docker

✅ Docker-compose vs Docker swarm

• Docker-compose
  : Docker-compose is used for configuring and starting multiple Docker containers on the same host so you don't have to start each container separately
• Docker swarm
  : Docker swarm is a container orchestration tool that allows us to run and connect containers on multiple hosts

✅ Docker commands for me

• $docker build -t <"file-name"> .
• $docker images
• $docker run -p <"local server #">:<"db server $"> <"file-name">
• $docker-compose down/up
• $docker-compose up <"file-name"> --build
• $docker-compose up <"file-name"> -d

Image reference: 드림코드 엘리