now maintainance mode
 now maintainance mode2-1

 : mariadb sample2

 : mariadb sample1

https://qiita.com/Ki4mTaria/items/778ff9186bb4958bb667

 : install mariadb

https://qiita.com/tamo_breaker/items/869fe672a22a52331042

m https://qiita.com/Ki4mTaria/items/778ff9186bb4958bb667

 : MariaDB

https://qiita.com/Ki4mTaria/items/ca21a96ad9d92622b2ba

 : insqll mysql

https://qiita.com/Ki4mTaria/items/778ff9186bb4958bb667