docker compose 使用节点 js 和 mysql - 无法与 mysql 连接

Question

我正在尝试使用 docker 部署我的节点 js 应用程序，但是当我运行 docker compose 时，它​​最后会出现错误。我尝试了一些解决方案，例如使用 wait-for-it.sh 文件，但问题仍然存在。

docker-compose.yml

version: '3'
services:
  db:
    build:
      context: .
      dockerfile: ./docker/Dockerfile-mysql
    environment:
      - MYSQL_ALLOW_EMPTY_PASSWORD=yes
      - MYSQL_DATABASE=dbautokab
      - MYSQL_USER=root
      - MYSQL_PASSWORD=
    networks:
      - helicopter-network
    healthcheck:
      test: "exit 0"

  helicopter-api:
    build:
      context: .
      dockerfile: ./docker/Dockerfile-api
    depends_on:
      - db
    networks: ['helicopter-network']
    environment:
        - PORT=3000
        - DATABASE_HOST=db
        - DATABASE_PASSWORD=
        - EGG_SERVER_ENV=local
        - NODE_ENV=development
    ports:
      - "3000:3000"
networks:
  helicopter-network:
    driver: bridge

Dockerfile-api

FROM node:10-slim

USER node

RUN mkdir -p /home/node/app

WORKDIR /home/node/app

COPY --chown=node package*.json ./

RUN npm install

COPY --chown=node . .

COPY wait-for-it.sh /

ENV HOST=0.0.0.0 PORT=3000

EXPOSE ${PORT}

# Run when the container launches
#CMD [ "node", "." ]
CMD /wait-for-it.sh db:3306 -- npm start

Dockerfile-mysql

FROM mysql 

COPY ./docker/init_db.sql /docker-entrypoint-initdb.d/

init_db.sql

CREATE DATABASE IF NOT EXISTS dbautokab;
GRANT ALL PRIVILEGES on dbautokab.*
TO 'root'@'%'
WITH GRANT OPTION;

db.js

var mysql = require('mysql');

var db_config = {
host     : '127.0.0.1', // Your host - either local or cloud  
user     : 'root', // your username
password : '', // your password
database : 'dbautokab' // database name
};

var connection;

function handleDisconnect() {
connection = mysql.createConnection(db_config); // Recreate the     connection, since
                                                // the old one cannot be reused.

connection.connect(function(err) {              // The server is either down
    if(err) {                                     // or restarting (takes a while sometimes).
        console.log('error when connecting to db:', err);
        setTimeout(handleDisconnect, 2000); // We introduce a delay before attempting to reconnect,
    }

                                 // to avoid a hot loop, and to allow our node script to
});                                     // process asynchronous requests in the meantime.
                                        // If you're also serving http, display a 503 error.
connection.on('error', function(err) {
    console.log('db error', err);
    if(err.code === 'PROTOCOL_CONNECTION_LOST') { // Connection to the MySQL server is usually
        handleDisconnect();                         // lost due to either server restart, or a
    } else {                                      // connnection idle timeout (the wait_timeout
        throw err;                                  // server variable configures this)
    }
});
}

handleDisconnect();

module.exports = connection;

错误：

直升机-api_1 |服务器已启动 3000
直升机-api_1 |连接到 db 时出错：{ 错误：连接 ECONNREFUSED 127.0.0.1:3306
直升机-api_1 |在 TCPConnectWrap.afterConnect [as oncomplete] (net.js:1106:14)
直升机-api_1 | --------------------
直升机-api_1 |在 Protocol._enqueue (/home/node/app/node_modules/mysql/lib/protocol/Protocol.js:144:48)
直升机-api_1 |在 Protocol.handshake (/home/node/app/node_modules/mysql/lib/protocol/Protocol.js:51:23)
直升机-api_1 |在 Connection.connect (/home/node/app/node_modules/mysql/lib/Connection.js:119:18)
直升机-api_1 |在 handleDisconnect (/home/node/app/db.js:16:16)
直升机-api_1 |在对象。 (/home/node/app/db.js:35:1)
直升机-api_1 |在 Module._compile (internal/modules/cjs/loader.js:776:30)
直升机-api_1 |在 Object.Module._extensions..js (internal/modules/cjs/loader.js:787:10)
直升机-api_1 |在 Module.load (internal/modules/cjs/loader.js:653:32)
直升机-api_1 |在 tryModuleLoad (internal/modules/cjs/loader.js:593:12)
直升机-api_1 |在 Function.Module._load (internal/modules/cjs/loader.js:585:3)
直升机-api_1 |错误号：'ECONNREFUSED'，
直升机-api_1 |代码：'ECONNREFUSED'，
直升机-api_1 |系统调用：“连接”，
直升机-api_1 |地址：'127.0.0.1',
直升机-api_1 |端口：3306，
直升机-api_1 |致命：真 }
db_1 |
db_1 | /usr/local/bin/docker-entrypoint.sh：运行 /docker-entrypoint-initdb.d/init_db.sql
db_1 |
db_1 |

Answer 1

您的nodejs app 和db 不在同一个容器中，因此db.js 无法访问带有ip 127.0.0.1 的数据库。

将container_name: mydb 添加到您的数据库服务中，如下所示：

services:
  db:
    build:
      context: .
      dockerfile: ./docker/Dockerfile-mysql
    container_name: mydb

然后，在db.js使用容器名访问db：

var db_config = {
 host     : 'mydb', // Your host - either local or cloud  
 user     : 'root', // your username
 password : '', // your password
 database : 'dbautokab' // database name
};