mkdir /scale

cd /scale

vi docker-compose.yml

version: "3"
  
services:
 srv_a:
  image: nginx

 srv_b:
  image: redis

docker compose up -d

docker compose ps

docker-compose up --scale srv_a=3 -d

docker compose ps

docker-compose up --scale srv_a=1 -d

docker compose ps

다 실습 확인 해보고