Thank you for your support. I thought that MariaDB would be compatible. Never had problems with it before.
I have installed MySQL 5.6 from MySQL community repositories.
https://dev.mysql.com/downloads/repo/yum/
A few things needed to be fixed:
Got this error at first: "Error: Unknown database driver or data source name (DSN)"
The package mysql-connector-odbc creates files /usr/lib64/libmyodbc5a.so and /usr/lib64/libmyodbc5w.so the Server-Linux-x86_64.sh looks for /usr/lib64/libmyodbc5.so so I just created a dirty fix:
[root@era ~]# ln -s /usr/lib64/libmyodbc5w.so /usr/lib64/libmyodbc5.so
Also when installing I got "Error: It is not possible to store big blocks of data in the database. Please reconfigure the database server first."
This was an easy fix with one additional line in my.cnf.
max_allowed_packet=33M
innodb_log_files_in_group=10
After this the installation finished correctly and I could log into the Web Console. Adding computers worked and all the relevant info is working, dynamic groups and all that jazz.
Also the repository is updating and I can remotely install all ESET products.
Thanks for the support again.