前段时间一直在折腾docker数据挂载的问题

docker-compose不熟悉的同学可以先看看我上一篇和docker-compose相关的博客：docker-compose搭建个人博客

0x00 功能需求

• 能够使用docker-compose一键开启/停止，一键生成/删除
• 数据持久化，能够在宿主机中修改容器设置

0x01 设计思路

• 要完成一键式服务，就必须在docker-compose.yml中写完全部的配置信息
• 修改容器配置，需要给数据库配置文件 /etc/mysql/my.cnf 做映射（mysql8，低版本的mysql需要修改映射地址）

0x02 代码实现

创建docker-compose文件，并创建conf文件夹，在conf文件夹内创建my.cnf文件

./docker-compose.yml

version: '3'
services:
  mysql:
    restart: always
    image: mysql:latest
    # 选择镜像，这里用的是mysql8，低版本mysql需要修改配置文件映射地址
    container_name: my_mysql
    volumes:
      - ./mydir:/mydir
      # 文件挂载
      - ./datadir:/var/lib/mysql
      # 挂载目录
      - ./conf/my.cnf:/etc/mysql/my.cnf
      # 挂载 my.cnf 配置文件
      - ./docker/mysql/source:/docker-entrypoint-initdb.d
    environment:
      - "MYSQL_ROOT_PASSWORD=xxxx"
      # 设置密码
      - "MYSQL_DATABASE=mydb"
      # 设置默认数据库
      - "TZ=Asia/Shanghai"
      # 设置时区
    ports:
      - 3306:3306
    # 设置端口

./conf/my.cnf

# Copyright (c) 2017, Oracle and/or its affiliates. All rights reserved.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; version 2 of the License.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA

#
# The MySQL  Server configuration file.
#
# For explanations see
# http://dev.mysql.com/doc/mysql/en/server-system-variables.html

[mysqld]
pid-file        = /var/run/mysqld/mysqld.pid
socket          = /var/run/mysqld/mysqld.sock
datadir         = /var/lib/mysql
# skip-grant-tables
# 不使用密码
secure-file-priv=NULL
# 设置FILE权限

# Custom config should go here
!includedir /etc/mysql/conf.d/

0x03 运行方法

docker-compose up -d
# 创建容器
docker-compose down
# 删除容器
docker-compose start
# 开始运行
docker-compose stop
# 结束运行

直接修改宿主机中的my.cnf即可修改容器数据库的配置

查看运行结果：

进入容器：

docker exec -it my_mysql /bin/bash
# 这里的my_mysql是docker-compose里面设置的容器名

mysql -u root -p
# 输入密码进入mysql终端