mariadb docker separate confing / data

 1. 

https://peihsinsu.gitbooks.io/docker-note-book/content/common-docker-mysql.html

2.

https://www.796t.com/article.php?id=8113

3. move data

https://www.digitalocean.com/community/tutorials/how-to-change-a-mariadb-data-directory-to-a-new-location-on-centos-7