上一篇完成了通过docker部署nginx+tomcat的基础软件架构，但是距离一个真正可用的软件架构还差得很远。其中最重要的一点是缺少数据库这个角色的存在，那么本篇就来完善这一点。
废话少说，直接进入正题。
首先拉取mysql镜像：
docker pull mysql:5.7
创建本地mysql目录：
mkdir -p ~/mysql/data ~/mysql/conf ~/mysql/logs
chmod -R 777 ~/mysql/logs
在mysql/conf目录下创建配置文件my.cnf：
# For advice on how to change settings please see
# http://dev.mysql.com/doc/refman/5.7/en/server-configuration-defaults.html [mysqld]
#
# Remove leading # and set to the amount of RAM for the most important data
# cache in MySQL. Start at % of total RAM for dedicated server, else %.
# innodb_buffer_pool_size = 128M
#
# Remove leading # to turn on a very important data integrity option: logging
# changes to the binary log between backups.
# log_bin
#
# Remove leading # to set options mainly useful for reporting servers.
# The server defaults are faster for transactions and fast SELECTs.
# Adjust sizes as needed, experiment to find the optimal values.
# join_buffer_size = 128M
# sort_buffer_size = 2M
# read_rnd_buffer_size = 2M
datadir=/var/lib/mysql
socket=/var/lib/mysql/mysql.sock # Disabling symbolic-links is recommended to prevent assorted security risks
symbolic-links= log-error=/var/log/mysql/error.log
pid-file=/var/run/mysqld/mysqld.pid # disabling the password validation
#validate_password=off # set bind-address
#bind-address=0.0.0.0
启动mysql：
docker run -d -p : --name mysql -e MYSQL_ROOT_PASSWORD=admin -v ~/mysql/conf:/etc/mysql/conf.d -v ~/mysql/data:/var/lib/mysql -v ~/mysql/logs:/var/log/mysql mysql:5.7
登录mysql测试下（root密码已经已经设置成了admin）：
mysql -uroot -p -h 172.17.0.2
看上去没什么问题