昨天將 mysql 跟 redis 都建置起來了，接著我們就要進行專案與 database 的串接，在這之前，我們最好也把我們的專案也使用容器包裝起來，然後讓所有的容器間能互相連接。

接著讓我們延續昨天的docker-compose.yaml，並把我們的專案添加進去，首先這邊我總共新增了三隻配置檔案(包含了昨天的docker-compose.yaml)。

1. docker-compose.yaml
   這次添加進去新的 web_server services，這邊有要注意的是兩個地方：

depends_on:
  - database_redis
  - database_mysql

第一個是 depends_on 的作用是，必須等 depends_on 底下的容器都啟動之後才啟動 web_server。
第二點是 利用 volumes

volumes:
   - './renco_microservices:/renco_microservices'

version: '3'
services:
    database_mysql:
        image: mysql:8.0.30
        container_name: database_mysql
        environment:
            MYSQL_ROOT_PASSWORD: ${DATABASE_PASSWORD}
            MYSQL_USER: ${DATABASE_USERNAME}
            MYSQL_PASSWORD: ${DATABASE_PASSWORD}
            MYSQL_DATABASE: ${DATABASE_NAME}
        ports:
            - 3306:3306
        volumes:
            - ./database/mysql/sqls:/docker-entrypoint-initdb.d
            - ./database/mysql/mysql.conf.d:/etc/mysql/mysql.conf.d
        networks:
            net:
                ipv4_address: 172.78.0.20
    database_redis:
        image: redis:7.0.4-alpine
        container_name: database_redis
        restart: always
        ports:
            - 6379:6379
        volumes:
            - ./database/redis/data:/data
            - ./database/redis/redis.conf:/usr/local/etc/redis/redis.conf
        command: redis-server /usr/local/etc/redis/redis.conf
        networks:
            net:
                ipv4_address: 172.78.0.21
    web_server:
        build:
          context: .
          dockerfile: ./renco_microservices/Dockerfile
        container_name: renco_microservices
        depends_on:
          - database_redis
          - database_mysql
        ports:
          - '3000:3000'
            environment:
              RENCO_MICROSERVICES: ${RENCO_MICROSERVICES}
              RENCO_DATACENTER_TOKEN: ${RENCO_DATACENTER_TOKEN}
              RENCO_BACKEND_URL: ${RENCO_BACKEND_URL}
              RENCO_DATACENTER_URL: ${RENCO_DATACENTER_URL}
            volumes:
              - './web_server:/web_server'
        networks:
            web_net:
                ipv4_address: 172.78.0.22
networks:
  web_net:
    ipam:
      driver: default
      config:
        - subnet: 172.78.0.0/16

2. dockerfile
   置於專案內的 Dockerfile 單純用於將 node 的容器拉下並依照裡面的步驟建置。

FROM node:14-alpine3.10

WORKDIR /web_server

RUN npm install pm2 -g

ENTRYPOINT ["sh", "./start.sh"]

3. start.sh
   這隻檔案是用於啟動專案使用的，後面這會再來講解pm2的用途。

npm install
pm2 start ./web_server.json
pm2 log

4. web_server.json
   用於啟動專案的 pm2 config 檔

[
  {
    "name": "web_server",
    "script": "./app.js",
    "exec_mode": "cluster",
    "instances": 4,
    "out_file": "./pm2/web_server-out.log",
    "pid_file": "./pm2/pid/web_server.pid",
    "args": "3000"
  }
]