🐳 Docker Compose 네트워크

## /path/our_app 경로
$ docker-compose up -d

Creating network "our_app_default" with the default driver
Creating our_app_db_1 ... done
Creating our_app_web_1 ... done

$ docker-compose down
Stopping our_app_web_1 ... done
Stopping our_app_db_1  ... done
Removing our_app_web_1 ... done
Removing our_app_db_1  ... done
Removing network our_app_default

$ docker-compose exec web ping db

PING db (192.168.48.2) 56(84) bytes of data.
64 bytes from our_app_db_1.our_app_default (192.168.48.2): icmp_seq=1 ttl=64 time=0.094 ms
64 bytes from our_app_db_1.our_app_default (192.168.48.2): icmp_seq=2 ttl=64 time=0.162 ms

services:
  web:
    build: .
    ports:
      - "8001:8000"

# 호스트 컴퓨터에서 web 서비스 컨테이너 접속
$ curl -I localhost:8001

HTTP/1.1 200 OK
Date: Fri, 05 Jun 2020 02:05:10 GMT
Server: WSGIServer/0.2 CPython/3.8.2
Content-Type: text/html
X-Frame-Options: DENY
Content-Length: 16351
X-Content-Type-Options: nosniff

# 같은 네트워크 내의 다른 컨테이너에서 web 서비스 컨테이너 접속
$ docker-compose exec alpine curl -I web:8000

HTTP/1.1 200 OK
Date: Fri, 05 Jun 2020 02:13:46 GMT
Server: WSGIServer/0.2 CPython/3.8.2
Content-Type: text/html
X-Frame-Options: DENY
Content-Length: 16351
X-Content-Type-Options: nosniff

$ docker-compose up -d
Creating network "our_app_default" with the default driver
Creating network "our_app_our_net" with driver "bridge"
...

$ our_app docker network ls
NETWORK ID          NAME                   DRIVER              SCOPE
f1859120a0c3        bridge                 bridge              local
95b00551745b        host                   host                local
1f7202baa40a        none                   null                local
2682634e6535        our_app_default        bridge              local
525403b38bbe        our_app_our_net        bridge              local

$ docker-compose down

Stopping our_app_web_1 ... done
Stopping our_app_db_1  ... done
Removing our_app_web_1 ... done
Removing our_app_db_1  ... done
Removing network our_app_default
Removing network our_app_our_net

$ docker network create our_net
6d791b927c8c151c45a10ac13c62f3571ecf38a90756fd2ca1c62b7d3de804e8

# 1번 방벙
version: '3.7'

services:
  web:
    build: .
    ports:
      - "8000:8000"
    networks:
      - our_net

networks:
  our_net:
    driver: bridge
    external: true