Question

我正在尝试使用docker运行Ruby on Rails项目，我不明白如何使这些东西工作可能是因为我不熟悉docker。
我从现在开始使用Ubuntu 16.04：

我已经安装了docker
我已经安装了docker-compose
我已成功运行docker-compose build
但是docker-compose run --rm web bin/setup因为不能停止而停止连接到mysql服务器

我得到的错误是：

#<Mysql2::Error: Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (2)>
Couldn't create database for {"adapter"=>"mysql2", "host"=>"localhost", "username"=>"root", "password"=>"root", "pool"=>5, "timeout"=>5000,  "database"=>"project"}, {}
Created database 'project'
rails aborted!
Mysql2::Error: Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (2)

在这里看看stackoverflow很多人说我必须确保mysql服务器正在运行。我怎样才能做到这一点？ docker ps的结果如下（省略了COMMAND ans CREATED列）

CONTAINER ID        IMAGE        STATUS              PORTS                              NAMES
9f03056e2b54        project_web  Up About an hour    0.0.0.0:3035->3035/tcp             project_webpack
465cfbac7cbd        mysql        Up About an hour    3306/tcp                           project_mysql

我的database.yml：

# SQLite version 3.x
#   gem install sqlite3
#
#   Ensure the SQLite 3 gem is defined in your Gemfile
#   gem 'sqlite3'
#
default: &default
  adapter: mysql2
  host: localhost
  username: root
  password: root
  pool: 5
  timeout: 5000

development:
  <<: *default
  database: project_local

# Warning: The database defined as "test" will be erased and
# re-generated from your development database when you run "rake".
# Do not set this db to the same as development or production.
test: &test
  <<: *default
  database: project_test

production:
  <<: *default
  database: db/production.sqlite3

staging:
  adapter: mysql2
  host: <MY HOST>
  database: project_dev
  username: root
  password: password
  pool: 5
  timeout: 5000
cucumber:
  <<: *test

我的docker-compose.yml：

version: '3.5'
services:
  web:
    build: .
    image: project_web
    container_name: project_web
    # restart: always
    command: >
      ./wait-for-it.sh db:3306 -- bash -c "
        rails server -p 3000 -b 0.0.0.0 --pid /app/tmp/pids/server.pid
        "
    ports: ["3000:3000"]
    volumes:
      - .:/app
      - ~/tmp:/host_tmp
      - bundle_cache:/bundle
    depends_on:
      - db
    environment:
      - DB_HOST=db
      - DB_USERNAME=root
      - DB_PASSWORD=root
  db:
    container_name: project_mysql
    image: mysql
    environment:
      - MYSQL_ROOT_PASSWORD=root
    volumes:
      - ./db-data:/var/lib/mysql
    restart: always
volumes:
  bundle_cache:
  # Mount volume with default driver

Answer 1

尝试将您的数据库.yml主机更改为0.0.0.0，这解决了我的问题。

在服务器的上下文中，0.0.0.0表示本地计算机上的所有IPv4地址。如果主机有两个IP地址192.168.1.1和10.1.2.1，并且主机上运行的服务器侦听0.0.0.0，则这两个IP都可以访问。

Answer 2

在运行docker-compose之前尝试运行容器本身：

docker run --rm -it mysql-server:latest bash

这应该会在容器内部为您提供正常的shell环境。从那里你可以尝试mysql，配置你的服务器，启动或停止它，然后你可以在“普通”的Linux上做。

ps：如果你需要mor工具，请尝试apt-get update，然后安装你需要的东西。

Answer 3

使用类似的docker-compose.yml，我的解决方案是删除db服务中定义的命名卷：

$ docker volume ls # confirm the named volume is present
DRIVER      VOLUME_NAME
local       db-data

$ docker-compose down # stop/remove your containers for this project

$ docker volume rm db-data # remove the (possibly) problematic volume

$ docker-compose up # start the project in the foreground and hopefully not see the socket connection error in the logs

无法通过套接字'/var/run/mysqld/mysqld.sock连接到本地MySQL服务器

3 个答案: