Docker：MySQL[2002] 尝试设置 2 个数据库容器时

Question

嗨，我正在努力学习 Docker。

作为起点，我遵循了 DigitalOcean 的设置教程 Laravel here。

我已经成功启动了所有容器，甚至完成了我的 Laravel 应用程序的构建。现在我想设置第二个数据库进行测试。

我复制了 docker-compose 的 db 部分的设置，并更改了容器名称和端口。

所有容器设置都很好，但是每当我尝试在任何一个数据库容器中执行运行 docker exec 时，我都会收到 2002 错误，这是我只有 1 个数据库容器时没有遇到的运行宁：

ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (2)

Docker文件:

FROM php:7.2-fpm

# Copy composer.lock and composer.json
COPY composer.lock composer.json /var/www/

# Set working directory
WORKDIR /var/www

# Install dependencies
RUN apt-get update && apt-get install -y \
    build-essential \
    mysql-client \
    libpng-dev \
    libjpeg62-turbo-dev \
    libfreetype6-dev \
    locales \
    zip \
    jpegoptim optipng pngquant gifsicle \
    vim \
    unzip \
    git \
    curl

# Clear cache
RUN apt-get clean && rm -rf /var/lib/apt/lists/*

# Install extensions
RUN docker-php-ext-install pdo_mysql mbstring zip exif pcntl
RUN docker-php-ext-configure gd --with-gd --with-freetype-dir=/usr/include/ --with-jpeg-dir=/usr/include/ --with-png-dir=/usr/include/
RUN docker-php-ext-install gd

# Install composer
RUN curl -sS https://getcomposer.org/installer | php -- --install-dir=/usr/local/bin --filename=composer

# Add user for laravel application
RUN groupadd -g 1000 www
RUN useradd -u 1000 -ms /bin/bash -g www www

# Copy existing application directory contents
COPY . /var/www

# Copy existing application directory permissions
COPY --chown=www:www . /var/www

# Change current user to www
USER www

# Expose port 9000 and start php-fpm server
EXPOSE 9000
CMD ["php-fpm"]

docker-compose.yml:

version: '3'
services:

  #PHP Service
  app:
    build:
      context: .
      dockerfile: Dockerfile
    image: digitalocean.com/php
    container_name: todo_app
    restart: unless-stopped
    tty: true
    environment:
      SERVICE_NAME: app
      SERVICE_TAGS: dev
    working_dir: /var/www
    volumes:
      - ./:/var/www
      - ./php/local.ini:/usr/local/etc/php/conf.d/local.ini
    networks:
      - app-network

  #Nginx Service
  web:
    image: nginx:alpine
    container_name: todo_web
    restart: unless-stopped
    tty: true
    ports:
      - "80:80"
      - "443:443"
    volumes:
      - ./:/var/www
      - ./nginx/conf.d/:/etc/nginx/conf.d/
    networks:
      - app-network

  #MySQL Service
  db:
    image: mysql:5.7.22
    container_name: todo_db
    restart: unless-stopped
    tty: true
    ports:
      - "3306:3306"
    environment:
      MYSQL_DATABASE: todo
      MYSQL_ROOT_PASSWORD: ent3r1n
      SERVICE_TAGS: dev
      SERVICE_NAME: mysql
    volumes:
      - dbdata:/var/lib/mysql/
      - ./mysql/my.cnf:/etc/mysql/my.cnf
    networks:
      - app-network

  db_test:
    image: mysql:5.7.22
    container_name: todo_db_test
    restart: unless-stopped
    tty: true
    ports:
      - "3307:3306"
    environment:
      MYSQL_DATABASE: todo
      MYSQL_ROOT_PASSWORD: ent3r1n
      SERVICE_TAGS: dev
      SERVICE_NAME: mysql
    volumes:
      - dbdata:/var/lib/mysql/
      - ./mysql/my.cnf:/etc/mysql/my.cnf
    networks:
      - app-network

#Docker Networks
networks:
  app-network:
    driver: bridge
#Volumes
volumes:
  dbdata:
    driver: local

docker ps的输出：

CONTAINER ID        IMAGE                  COMMAND                  CREATED             STATUS              PORTS                                      NAMES
f5ccebc57f9d        digitalocean.com/php   "docker-php-entrypoi…"   15 seconds ago      Up 13 seconds       9000/tcp                                   todo_app
7cc53434d7d7        nginx:alpine           "nginx -g 'daemon of…"   15 seconds ago      Up 13 seconds       0.0.0.0:80->80/tcp, 0.0.0.0:443->443/tcp   todo_web
7aab5318e7af        mysql:5.7.22           "docker-entrypoint.s…"   15 seconds ago      Up 13 seconds       0.0.0.0:3307->3306/tcp                     todo_db_test
5b72306f63a4        mysql:5.7.22           "docker-entrypoint.s…"   15 seconds ago      Up 13 seconds       0.0.0.0:3306->3306/tcp                     todo_db

Answer 1

我遇到过这样的问题，因为你使用的图片：image: mysql:5.7.22 您应该使用：image: mysql/mysql-server:5.7。希望对你有帮助。

Docker：MySQL[2002] 尝试设置 2 个数据库容器时

Docker: MySQL[2002] when trying to setup 2 DB containers

mysql

docker

digital-ocean

laravel-5

docker-compose