Docker 개념

 

 

 

Name	Description
image	상태 저장파일
container	image 를 instance화 한것. (running state)

 

image 는 상태를 저장한 프로그램이고
container 는 image 를 실행시킨 프로세스와 같다.

 

 

대표 명령어를 보자

아래 명령어는 이미 설치된 image 파일의 이름으로부터 컨테이너를 실행시키는 것이다.

$ docker run [image-file-name] --name [container-name]

# docker: docker engine program
# run: This subcommand is used to create and run a docker container from 'image'

 

 

 

Dockerfile

텍스트 문서로 image 를 흉내내기 위해 쓰인다.

 

When to use Dockerfile?

도커 image 를 원하는 방식으로 빌드하고자 할 때

 

$ docker build -f [Dockerfile-path]

 

# FROM [image-name]

# FROM is used to set Base Image for the subsequent instructions.
# A valid Dockerfile must have FROM as its first instruction.

FROM redis



# RUN [command]
# This is used to execute any command of th current image
RUN /bin/bash -c 'source $HOME/.bashrc; echo $HOME'

# CMD ["arg1", "arg2", "arg3"...] 
# ⚠️ Only last one CMD will be executed.
CMD ["node", "index.js"]



# WORKDIR
# This is used to set the workig for any RUN, CMD, COPY instruction 
# that follows in the Dockerfile.

# If work directory doesn't exist, it weill be created by default.
# We can use WORKDIR multiple times in a Dockerfile.

WORKDIR /var/www/html

 

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🔗 Reference

Docker DockerFile - javatpoint