1. 首先创建一个目录并在目录下创建一个Dockerfile，文件内容如下
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FROM centos:centos6
MAINTAINER Fanbin Kong "kongxx@hotmail.com"
RUN yum install -y mysql-server mysql
RUN /etc/init.d/mysqld start &&\
mysql -e "grant all privileges on *.* to 'root'@'%' identified by 'letmein';"&&\
mysql -e "grant all privileges on *.* to 'root'@'localhost' identified by 'letmein';"&&\
mysql -u root -pletmein -e "show databases;"
EXPOSE 3306
CMD ["/usr/bin/mysqld_safe"]
