Docker Compose란 무엇인가?

홍태경·2021년 5월 27일
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server.js 에서 설정한 것들이 잘 실행 되려면 선행적으로 redis-server가 잘 실행되어야 한다.

1. 레디스 서버를 먼저 실행

2. 도커파일 이미지를 생성하여 이 이 어플리케이션에 관련된 컨테이너 생성

nodejs-docker-compose-app 디렉토리 생성 후

npm init 하여 엔터다발로 package.json을 만든다

package.json

{
  "name": "nodejs-docker-compose-app",
  "version": "1.0.0",
  "main": "index.js",
  "scripts": {
    "start":"node server.js",
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "dependencies":{
    "express":"4.17.1",
    "redis":"3.0.2"
  },
  "author": "",
  "license": "ISC",
  "description": ""
}

server.js

const express = require("express");
const redis = require("redis");
//레디스 클라이언트 생성
const client = redis.createClient({

    host:"redis-server",
    port: 6379
})

const app = express();

//숫자는 0부터 시작합니다.
client.set("number",0);
app.get('/', (req,res) => {
    client.get("number", (err,number) => {
        // 현재 숫자를 가져온 후에 1씩 올려줍니다.
        client.set("number",parseInt(number) + 1)
        res.send("숫자가 1씩 올라갑니다. 숫자:" + number)
    })
})
app.listen(8080)
console.log('server is running');

도커 파일 작성


FROM node:10

WORKDIR /usr/src/app

# ./ = package.json ./ =server.js
COPY ./ ./

# npm install = 종속성 다운 
RUN npm install

# 컨테이너가 시작될 때 실행할 커멘드
CMD ["node","server.js"]
  1. 레디스 서버를 먼저 실행
    (base) hongtae@user:~/바탕화면/nodejs-docker-compose-app$ sudo docker run redis

  2. 이미지 생성후 컨테이너 실행

sudo docker run gusxoqkqh1/docker-compose-app
server is running
events.js:174
throw er; // Unhandled 'error' event
^

레디스가 레디스 서버와 연결이 실패했다.

Error: Redis connection to redis-server:6379 failed - getaddrinfo ENOTFOUND redis-server redis-server:6379
at GetAddrInfoReqWrap.onlookup as oncomplete
Emitted 'error' event at:
at RedisClient.on_error (/usr/src/app/node_modules/redis/index.js:341:14)
at Socket. (/usr/src/app/node_modules/redis/index.js:222:14)
at Socket.emit (events.js:198:13)
at emitErrorNT (internal/streams/destroy.js:91:8)
at emitErrorAndCloseNT (internal/streams/destroy.js:59:3)
at process._tickCallback (internal/process/next_tick.js:63:19)
에러 이유는 무엇일까?

컨테이너 간에 접근을 가능하게 해주는 무언가가 필요하다
노트 앱+ 레디스 클라이언트가 레디스 서버로 접근을 시도해야 한다.

이떄 사용하는것이 docker compose이다

docker-compose-yml

version:"3"
services:
    redis-server:
        image: "redis"
    node-app:
        build: .
        ports:
            -"5000:8000"

도커가 설치 되어있는데 또 설치를 하라 한다..

(base) hongtae@user:~/바탕화면/nodejs-docker-compose-app$ docker-compose up

Command 'docker-compose' not found, but can be installed with:

sudo snap install docker # version 19.03.13, or
sudo apt install docker-compose # version 1.25.0-1

See 'snap info docker' for additional versions.
docker -v
Docker version 20.10.6, build 370c289

sudo apt install docker-compose

sudo docker-compose up
ERROR: yaml.scanner.ScannerError: mapping values are not allowed here
in "./docker-compose.yml", line 2, column 9

간격 잘 맞춰라

version: "3"
services:
  redis-server:
        image: "redis"
  node-app:
        build: .
        ports:
            - "5000:8080"

sudo docker-compose up
Starting nodejs-docker-compose-app_redis-server_1 ... done
Starting nodejs-docker-compose-app_node-app_1 ... done
Attaching to nodejs-docker-compose-app_node-app_1, nodejs-docker-compose-app_redis-server_1
redis-server_1 | 1:C 27 May 2021 07:47:51.513 # oO0OoO0OoO0Oo Redis is starting oO0OoO0OoO0Oo
redis-server_1 | 1:C 27 May 2021 07:47:51.513 # Redis version=6.2.3, bits=64, commit=00000000, modified=0, pid=1, just started
redis-server_1 | 1:C 27 May 2021 07:47:51.513 # Warning: no config file specified, using the default config. In order to specify a config file use redis-server /path/to/redis.conf
redis-server_1 | 1:M 27 May 2021 07:47:51.513 monotonic clock: POSIX clock_gettime
redis-server_1 | 1:M 27 May 2021 07:47:51.514
Running mode=standalone, port=6379.
redis-server_1 | 1:M 27 May 2021 07:47:51.514 # Server initialized
redis-server_1 | 1:M 27 May 2021 07:47:51.514 # WARNING overcommit_memory is set to 0! Background save may fail under low memory condition. To fix this issue add 'vm.overcommit_memory = 1' to /etc/sysctl.conf and then reboot or run the command 'sysctl vm.overcommit_memory=1' for this to take effect.
redis-server_1 | 1:M 27 May 2021 07:47:51.514 Loading RDB produced by version 6.2.3
redis-server_1 | 1:M 27 May 2021 07:47:51.514
RDB age 17 seconds
redis-server_1 | 1:M 27 May 2021 07:47:51.514 RDB memory usage when created 0.79 Mb
redis-server_1 | 1:M 27 May 2021 07:47:51.514
DB loaded from disk: 0.000 seconds
redis-server_1 | 1:M 27 May 2021 07:47:51.514 * Ready to accept connections
node-app_1 | server is running

결과는 ... 오타 ㅠ

server.js 에서 13 줄 client > client.get 으로 수정

두번째 부터는 --build를 한다

다시 sudo docker-compose up --build

docker compose로 컨테이너 한꺼번에 멈추기

docker compose down ( 반드시 yml파일이 있는 곳에서 해야한다.)

sudo docker-compose up -d (백그라운드 실행)
sudo docker-compose up -d --build

(base) hongtae@user:~/바탕화면/nodejs-docker-compose-app$ sudo docker-compose down
Stopping nodejs-docker-compose-app_node-app_1 ... done
Stopping nodejs-docker-compose-app_redis-server_1 ... done
Removing nodejs-docker-compose-app_node-app_1 ... done
Removing nodejs-docker-compose-app_redis-server_1 ... done
Removing network nodejs-docker-compose-app_default
(base) hongtae@user:~/바탕화면/nodejs-docker-compose-app$ sudo docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
f5917a9f29c3 redis "docker-entrypoint.s…" 51 minutes ago Up 51 minutes 6379/tcp elastic_diffie
df9c2edfb81c gusxoqkqh1/nodejs "docker-entrypoint.s…" 3 hours ago Up 3 hours 0.0.0.0:4000->8080/tcp, :::4000->8080/tcp frosty_shannon
1fe58523dd97 f1e8d1c19a48 "docker-entrypoint.s…" 5 hours ago Up 5 hours clever_davinci
374a124e4202 f1e8d1c19a48 "docker-entrypoint.s…" 5 hours ago Up 5 hours relaxed_wiles
(base) hongtae@user:~/바탕화면/nodejs-docker-compose-app$

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