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mysql - 使用 Docker-Compose 连接到 MariaDB 时出错，“连接丢失：服务器关闭了连接”

问题描述

我正在尝试使用命令 docker-compose up 将官方 MariaDB docker 映像连接到我的客户端应用程序的映像；它成功连接到服务器，但在尝试连接到 MariaDB 数据库时，大约一分钟后记录“错误：连接丢失：服务器关闭连接”。 启动服务器时我在本地连接到数据库没有问题，但是在尝试链接相同代码的 docker 图像时会引发错误。

我的 docker-compose.yml：

version: '3.1'
services:
  webapp:

    image: client
    ports:
      - "3306:3306"
    links: 
      - db
    depends_on:
      - db
    environment:
      DATABASE_URL: "mysql://root:root@db/yelp"
db:
  image: mariadb:latest
  restart: always
  environment:
    MYSQL_ROOT_PASSWORD: root
    MYSQL_DATABASE: yelp

adminer:
  image: adminer
  restart: always
  ports:
    - 3001:3001

Dockerfile：

FROM node:10

WORKDIR /cadenza/documents/SDC/leaveReview

COPY package*.json ./

RUN npm install

COPY . .

EXPOSE 3306

CMD ["npm", "start"]

mysql/MariaDB index.js 连接文件：

var mysql = require('mysql')
var connection = mysql.createConnection({
    host: '127.0.0.1',
    user: 'root',
    password: 'root',
    database: 'yelp'
});

connection.connect((err) => {
    if (err) {
        console.log('error when connecting to db', err);
    } else {
        console.log('connected to db')
    }
});

module.exports = connection;

运行 docker-compose up 时的日志：

    docker-compose up
Starting leavereview_db_1      ... done
Starting leavereview_adminer_1 ... done
Starting leavereview_webapp_1  ... done
Attaching to leavereview_adminer_1, leavereview_db_1, leavereview_webapp_1
adminer_1  | PHP 7.2.7 Development Server started at Tue Jul  3 02:34:03 2018
webapp_1   |
webapp_1   | > yelp-reviews@1.0.0 start /cadenza/documents/SDC/leaveReview
webapp_1   | > nodemon server/index.js
webapp_1   |
db_1       | 2018-07-03  2:34:04 0 [Note] mysqld (mysqld 10.3.7-MariaDB-1:10.3.7+maria~jessie) starting as process 1 ...
db_1       | 2018-07-03  2:34:04 0 [Note] InnoDB: Using Linux native AIO
db_1       | 2018-07-03  2:34:04 0 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins
db_1       | 2018-07-03  2:34:04 0 [Note] InnoDB: Uses event mutexes
db_1       | 2018-07-03  2:34:04 0 [Note] InnoDB: Compressed tables use zlib 1.2.8
db_1       | 2018-07-03  2:34:04 0 [Note] InnoDB: Number of pools: 1
db_1       | 2018-07-03  2:34:04 0 [Note] InnoDB: Using SSE2 crc32 instructions
db_1       | 2018-07-03  2:34:04 0 [Note] InnoDB: Initializing buffer pool, total size = 256M, instances = 1, chunk size = 128M
db_1       | 2018-07-03  2:34:04 0 [Note] InnoDB: Completed initialization of buffer pool
db_1       | 2018-07-03  2:34:04 0 [Note] InnoDB: If the mysqld execution user is authorized, page cleaner thread priority can be changed. See the man page of setpriority().
db_1       | 2018-07-03  2:34:04 0 [Note] InnoDB: Starting crash recovery from checkpoint LSN=1630896
db_1       | 2018-07-03  2:34:04 0 [Note] InnoDB: 128 out of 128 rollback segments are active.
db_1       | 2018-07-03  2:34:04 0 [Note] InnoDB: Removed temporary tablespace data file: "ibtmp1"
db_1       | 2018-07-03  2:34:04 0 [Note] InnoDB: Creating shared tablespace for temporary tables
db_1       | 2018-07-03  2:34:04 0 [Note] InnoDB: Setting file './ibtmp1' size to 12 MB. Physically writing the file full; Please wait ...
db_1       | 2018-07-03  2:34:04 0 [Note] InnoDB: File './ibtmp1' size is now 12 MB.
db_1       | 2018-07-03  2:34:04 0 [Note] InnoDB: Waiting for purge to start
webapp_1   | [nodemon] 1.17.5
webapp_1   | [nodemon] to restart at any time, enter `rs`
webapp_1   | [nodemon] watching: *.*
webapp_1   | [nodemon] starting `node server/index.js`
db_1       | 2018-07-03  2:34:04 0 [Note] InnoDB: 10.3.7 started; log sequence number 1630905; transaction id 21
db_1       | 2018-07-03  2:34:04 0 [Note] InnoDB: Loading buffer pool(s) from /var/lib/mysql/ib_buffer_pool
db_1       | 2018-07-03  2:34:04 0 [Note] Plugin 'FEEDBACK' is disabled.
db_1       | 2018-07-03  2:34:04 0 [Note] Recovering after a crash using tc.log
db_1       | 2018-07-03  2:34:04 0 [Note] Starting crash recovery...
db_1       | 2018-07-03  2:34:04 0 [Note] Crash recovery finished.
db_1       | 2018-07-03  2:34:04 0 [Note] Server socket created on IP: '::'.
db_1       | 2018-07-03  2:34:04 0 [Note] InnoDB: Buffer pool(s) load completed at 180703  2:34:04
db_1       | 2018-07-03  2:34:04 0 [Warning] 'proxies_priv' entry '@% root@a1a244ac54cf' ignored in --skip-name-resolve mode.
db_1       | 2018-07-03  2:34:04 0 [Note] Reading of all Master_info entries succeded
db_1       | 2018-07-03  2:34:04 0 [Note] Added new Master_info '' to hash table
db_1       | 2018-07-03  2:34:04 0 [Note] mysqld: ready for connections.
db_1       | Version: '10.3.7-MariaDB-1:10.3.7+maria~jessie'  socket: '/var/run/mysqld/mysqld.sock'  port: 3306  mariadb.org binary distribution
webapp_1   | Listening on port  3306
webapp_1   | error when connecting to db { Error: Connection lost: The server closed the connection.
webapp_1   |     at Protocol.end (/cadenza/documents/SDC/leaveReview/node_modules/mysql/lib/protocol/Protocol.js:113:13)
webapp_1   |     at Socket.<anonymous> (/cadenza/documents/SDC/leaveReview/node_modules/mysql/lib/Connection.js:109:28)
webapp_1   |     at Socket.emit (events.js:187:15)
webapp_1   |     at endReadableNT (_stream_readable.js:1081:12)
webapp_1   |     at process._tickCallback (internal/process/next_tick.js:63:19)
webapp_1   |     --------------------
webapp_1   |     at Protocol._enqueue (/cadenza/documents/SDC/leaveReview/node_modules/mysql/lib/protocol/Protocol.js:145:48)
webapp_1   |     at Protocol.handshake (/cadenza/documents/SDC/leaveReview/node_modules/mysql/lib/protocol/Protocol.js:52:23)
webapp_1   |     at Connection.connect (/cadenza/documents/SDC/leaveReview/node_modules/mysql/lib/Connection.js:130:18)
webapp_1   |     at Object.<anonymous> (/cadenza/documents/SDC/leaveReview/database/index.js:9:12)
webapp_1   |     at Module._compile (internal/modules/cjs/loader.js:702:30)
webapp_1   |     at Object.Module._extensions..js (internal/modules/cjs/loader.js:713:10)
webapp_1   |     at Module.load (internal/modules/cjs/loader.js:612:32)
webapp_1   |     at tryModuleLoad (internal/modules/cjs/loader.js:551:12)
webapp_1   |     at Function.Module._load (internal/modules/cjs/loader.js:543:3)
webapp_1   |     at Module.require (internal/modules/cjs/loader.js:650:17) fatal: true, code: 'PROTOCOL_CONNECTION_LOST' }
webapp_1   | (node:29) [DEP0096] DeprecationWarning: timers.unenroll() is deprecated. Please use clearTimeout instead.

它应该记录“连接到数据库”。我还尝试了人们建议的解决方案，用于处理由于空闲等原因导致的服务器断开连接，但它甚至没有首先连接到数据库。

标签： mysqlnode.jsdockerdocker-composemariadb

解决方案

因此，在我将数据库连接 index.js 文件中的主机从“127.0.0.1”更改为：

var connection = mysql.createConnection({
host: 'db',
user: 'root',
password: 'root',
database: 'yelp'
});

其中“db”指的是我的 docker-compose.yml 文件中的“db”图像。

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