What is Docker Compose?

A tool for Docker applications that define and run multiple containers. Set up application services using YAML files. Mainly used in the following cases.

--When the $ docker run command gets longer --When starting multiple containers at once

Example of how to write a YAML file

An example YAML file when the docker command is as follows.

$ docker build .
$ docker run -it -v ~/Desktop/myapp:/myapp -p 3000:3000 <image> bash

The YAML file is as follows.

version: '3'

services:
  web:
    build: .
    ports:
      - '3000:3000'
    volumes:
      - '.:/myapp'
    tty: true
    stdin_open: true

Web naming is arbitrary, but web or app is often used. The correspondence between docker commands (run option) and YAML files is as follows.

docker command	YAML file
build	build:
-i	stdin_open: true
-t	tty: true
-v	volumes:
-p	ports:

Docker Compose command

The correspondence with the Docker command is as follows.

command	Dockercommand
docker-compose build	docker build
docker-compose up	docker run
docker-compose ps	docker ps
docker-compose exec <sevice> <command>	docker exec <container> <command>
docker-compose up --build	build and run
docker-compose down	stop and rm