为什么80%的码农都做不了架构师？>>> 
#1 安装docker mysql镜像。
这个简单，原来用过直截在docker-compose.yml文件中添加mysql一节，
mysql:
16 image: mysql
17 ports:
18 - "3306:3306"
19 volumes:
20 - ./data:/var/lib/mysql
21 environment:
22 - MYSQL_DATABASE=*****
23 - MYSQL_ROOT_PASSWORD=******************
然后直截，进行构建，下载mysql镜像
docker-compose build
#2 起动数据库
启动docker项目
docker-compose up
数据库已经运行起来了，下一步就是创建数据库了，可是mysql的默认字符集还没有修改，查看默认字符集的设置：
mysql> show variables like 'character%';
+--------------------------+----------------------------+
| Variable_name | Value |
+--------------------------+----------------------------+
| character_set_client | latin1 |
| character_set_connection | latin1 |
| character_set_database | latin1 |
| character_set_filesystem | binary |
| character_set_results | latin1 |
| character_set_server | latin1 |
| character_set_system | utf8 |
| character_sets_dir | /usr/share/mysql/charsets/ |
+--------------------------+----------------------------+
8 rows in set (0.00 sec)
这样可不行，得改成utf8才能支持中文。
#3 查找my.cnf
mysql的官方镜像中，my.cnf文件放在/etc/mysql/中。
root@8fd3e5751f88:/etc/mysql# ls -al
total 24
drwxr-xr-x 8 root root 4096 Mar 28 08:29 .
drwxr-xr-x 61 root root 4096 Mar 28 08:08 ..
drwxr-xr-x 2 root root 4096 Mar 28 08:28 conf.d
lrwxrwxrwx 1 root root 24 Mar 21 21:53 my.cnf -> /etc/alternatives/my.cnf
-rw-r--r-- 1 root root 1050 Nov 28 19:25 my.cnf.fallback
-rw-r--r-- 1 root root 797 Mar 28 08:23 mysql.cnf
drwxr-xr-x 2 root root 4096 Mar 28 08:32 mysql.conf.d
root@8fd3e5751f88:/etc/mysql#
经查看验证，my.cnf 中，除了指定 包含conf.d 和mysql.conf.d目录之外，什么内容都没有。 要找mysqld和client节，都找不到，那只发在这两个目录中找了。 终于在 /etc/mysql/mysql.conf.d/mysql.cnf中找到一些配置，最起码是有[mysqld]节内容的。
#4 修改配置
在原有的基础上，参照网上的说法添加
[client]
default-character-set=utf8
在[mysqld]节后面添加如下内容：
#changed by janl at 20170328
default-storage-engine=INNODB
character-set-server=utf8
collation-server=utf8_general_ci
#5 验证配置结果
然后，重启docker，看看默认字符集变过来了没有
mysql> show variables like 'character%';
+--------------------------+----------------------------+
| Variable_name | Value |
+--------------------------+----------------------------+
| character_set_client | utf8 |
| character_set_connection | utf8 |
| character_set_database | utf8 |
| character_set_filesystem | binary |
| character_set_results | utf8 |
| character_set_server | utf8 |
| character_set_system | utf8 |
| character_sets_dir | /usr/share/mysql/charsets/ |
+--------------------------+----------------------------+
8 rows in set (0.01 sec)
mysql>
#6 设备root密码
先设置root密码。
mysql> set password for root@localhost = password('***********');
Query OK, 0 rows affected, 1 warning (0.00 sec)
重新登录验证
root@8fd3e5751f88:/# mysql
ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: NO)
加密码登录
root@8fd3e5751f88:/# mysql -u root -p
Enter password:
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 7
Server version: 5.7.17 MySQL Community Server (GPL)
Copyright (c) 2000, 2016, Oracle and/or its affiliates. All rights reserved.
Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
mysql>
OK了，这回可以开始工作了。