在linux上安装mysql
因为版权的原因，linux7上面的mysql，已经用mariadb这个发行版本了。下面我们就安装 mariadb，不用担心兼容性问题，你就当他是mysql就可以了。
yum install mariadb mariadb-server
检查mariadb服务是否成功安装了
[ec2-user@ip-172-31-19-80 init.d]$ systemctl list-unit-files |grep maria
mariadb.service disabled
启动mysql
service mariadb start
进入mysql,看到如下的内容，就说明你的mysql已经配置好了。
[ec2-user@ip-172-31-19-80 booking-node]$ mysql
Welcome to the MariaDB monitor. Commands end with ; or \g.
Your MariaDB connection id is 7
Server version: 5.5.56-MariaDB MariaDB Server
Copyright (c) 2000, 2017, Oracle, MariaDB Corporation Ab and others.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
MariaDB [(none)]>
