我尝试dockerlized我自己的节点应用程序，但无法连接mysql容器。我的代码：

docker-compose.yml公司

version: '3.2'
  services:
    node:
      build: ./
      ports:
        - "8787:8787"
      depends_on:
        - db
      networks:
        - docker_xxx
      environment:
        - PORT=8787
        - DATABASE_HOST=db
        - DATABASE_PASSWORD=xxx
        - EGG_SERVER_ENV=local
        - NODE_ENV=development
      # command: ["./wait-for-it.sh", "db:3306", "--", "npm run docker"]
    db:
      build: ./db
      networks:
        - docker_xxx
      environment:
        - MYSQL_ROOT_PASSWORD=xxx
        - MYSQL_DATABASE=database
        - MYSQL_USER=user
        - MYSQL_PASSWORD=passwd

  networks:
    docker_xxx:
      driver: bridge

./dockerfile（用于节点）

FROM node:8.9.4-alpine

  RUN mkdir -p /usr/src/app

  WORKDIR /usr/src/app

  COPY package.json /usr/src/app/

  RUN npm install --production

  COPY . /usr/src/app
  # COPY wait-for-it.sh /usr/src/app

  EXPOSE 8787

  CMD npm run docker

db/dockerfile（用于mysql）

FROM mysql:5.6

  ADD honggang.sql /docker-entrypoint-initdb.d

配置/config.default.js

config.mysql = {
    // mysql settings
    client: {
      // host
      host: process.env.DATABASE_HOST || '127.0.0.1',
      // port
      port: '3306',
      // username
      user: 'root',
      // password
      password: 'xxx',
      database: 'xxx',
      charset: 'utf8',
      dialectOptions: {
        collate: 'utf8_general_ci',
      },
    },
    app: true,
    agent: false,
  };

我跑了 docker-compose up -d ，只有 db 跑步。
我跑了 docker logs hash 要查找错误，它将显示以下信息：

2018-04-30 14:43:51,334 ERROR 54 nodejs.ECONNREFUSEDError: connect ECONNREFUSED 172.19.0.2:3306
            at Object._errnoException (util.js:1022:11)
            at _exceptionWithHostPort (util.js:1044:20)
            at TCPConnectWrap.afterConnect [as oncomplete] (net.js:1182:14)
            --------------------
            at Protocol._enqueue (/usr/src/app/node_modules/mysql/lib/protocol/Protocol.js:145:48)
            at Protocol.handshake (/usr/src/app/node_modules/mysql/lib/protocol/Protocol.js:52:23)
            at PoolConnection.connect (/usr/src/app/node_modules/mysql/lib/Connection.js:130:18)
            at Pool.getConnection (/usr/src/app/node_modules/mysql/lib/Pool.js:48:16)
            at /usr/src/app/node_modules/ali-rds/node_modules/pify/index.js:29:7
            at new Promise (<anonymous>)
            at Pool.<anonymous> (/usr/src/app/node_modules/ali-rds/node_modules/pify/index.js:12:10)
            at Pool.ret [as getConnection] (/usr/src/app/node_modules/ali-rds/node_modules/pify/index.js:56:34)
            at Pool.query (/usr/src/app/node_modules/mysql/lib/Pool.js:202:8)
            at /usr/src/app/node_modules/ali-rds/node_modules/pify/index.js:29:7
            sql: select now() as currentTime;
        code: 'ECONNREFUSED'
        errno: 'ECONNREFUSED'
        syscall: 'connect'
        address: '172.19.0.2'
        port: 3306
        fatal: true
        name: 'ECONNREFUSEDError'
        pid: 54
        hostname: d9cd95667a5d

我补充道 CMD ping db ，它回应道。
我试着用 wait-for-it.sh （代码刚刚注解掉），但得到了错误信息：

env: can't execute 'bash': No such file or directory