Reinstall Mariad-db/Mysql

What issues/errors you get now? Corruption depending on severity can be repaired usually without wiping your data.

Do you have any installed/imported MySQL database data already? Or nothing besides the initial Centmin Mod install? Sounds like you have MySQL data already installed?

This guide wipes all data and recreates MySQL system database only, your site databases would all be deleted MariaDB - Insight Guide - How to use mysql_install_db to reset your MySQL database directory

 

You may have accidentally uninstalled MariaDB server in the past? Even if you did, data would still be intact at /var/lib/mysql

Check your YUM history transactions to see if you accidentally removed MariaDB-* YUM packages, post output for these commands

Code (Text):

yum history list MariaDB*

and

Code (Text):

yum history list mariadb*

for posting code or output from commands to keep the formatting, you might want to use CODE tags for code How to use forum BBCODE code tags

Then you can drill down into specifics for each YUM transaction using the transaction id i.e. XX on left column of output

Code (Text):

yum history info XX

The idea is to see if any YUM transactions ended up removing/uninstalling MariaDB YUM packages. Cause if they did, you can easily reverse the YUM transaction via yum history undo commands How to Undo or Redo a Yum Install on CentOS and RHEL