大家好，又见面了，我是你们的朋友全栈君。

Docker 修改MySQL配置

作者：YoungJ

前言：大部分程序员在刚使用docker时，按照教程迅速的就装完了mysql，在使用的过程中出现各种问题：比如中文乱码、com.mysql.jdbc.PacketTooBigException: Packet for query is too large (1053 > 1024).等等，最简单的方式通过sql去设置，但每次重启又还原了，那么本文就是通过docker下MySQL的配置去解决该问题。

1. 从安装说起，获取镜像

   docker pull mysql:5.7.18
   

2. 查看镜像

   docker images
   

   

3. 运行docker容器

   docker run -d -p 3306:3306 --name mymysql -e MYSQL_ROOT_PASSWORD=123456 mysql:5.7.18
   

   (* 这里没有设置挂载外部的配置)

4. 查看容器是否启动成功

   docker ps
   

   

5. 进入容器

   docker exec -it 1383f2e49cb7 /bin/bash
   

   

6. 查看配置

   more /etc/mysql/mysql.conf.d/mysqld.cnf
   

   （* 如果你执行到这步提示没有该文件，别着急，往下看）

7. 编辑配置

   • 第一种方式：将配置从容器中copy到宿主机（之前文章讲到过，可以去看下，如果没有该文件，那这一步省略，稍后直接将我写好的配置放到容器中就好）

     docker cp mysql:/etc/mysql/mysql.conf.d/mysqld.cnf /root/mysqld.cnf
     

     mysqld.cnf脚本如下：

     # Copyright (c) 2014, 2016, 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
     #log-error = /var/log/mysql/error.log
     # By default we only accept connections from localhost
     #bind-address = 127.0.0.1
     # Disabling symbolic-links is recommended to prevent assorted security risks
     symbolic-links=0
     character_set_server=utf8
     init_connect='SET NAMES utf8'
     max_allowed_packet = 20M
     
     [mysql]
     default-character-set = utf8
     
     [mysql.server]
     default-character-set = utf8
     
     [mysqld_safe]
     default-character-set = utf8
     
     [client]
     default-character-set = utf8
     

     将修改后的配置copy到容器
     

     docker cp /root/mysqld.cnf mymysql:/etc/mysql/mysql.conf.d/
     

     (* mymysql是你容器的name,不清楚的可以通过docker ps看到)

   • 另一种方式，直接编辑
     在使用docker容器时，有时候里边没有安装vim，敲vim命令时提示说：vim: command not found，这个时候就需要安装vim，可是当你敲apt-get install vim命令时，提示：
     Reading package lists… Done
     Building dependency tree
     Reading state information… Done
     E: Unable to locate package vim
     这时候需要敲：

     apt-get update
     

     这个命令的作用是：同步 /etc/apt/sources.list 和 /etc/apt/sources.list.d 中列出的源的索引，这样才能获取到最新的软件包。
     等更新完毕以后再敲命令：

     apt-get install vim
     

     vim /etc/mysql/mysql.conf.d/mysqld.cnf
     

8. 接下来重启容器就可以了（可以参考之前的文章）

   docker restart 1383f2e49cb7 
   

   (* 1383f2e49cb7是容器的CONTAINER ID，可以通过docker ps看到 )

可以参考：

• https://blog.csdn.net/i_am_tomato/article/details/80530039
• https://www.jb51.net/article/141620.htm