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Hi @
It’s hard to troubleshoot it like that, quick searches have showed me similar issues which have been resolved like:
!includedir /etc/mysql/mysql.conf.d/Hello,
For MySQL and CentOS 7, I could suggest following the steps from this tutorial here:
https://bobbyiliev.com/blog/galera-cluster-mariadb-10-1-on-centos-7-server
However, as a side note, keep in mind that both MySQL 5.6 and CentOS 7 are both EOL, meaning that they are no longer officially supported and no security updates will be released. So if you are setting this up for a production system, I would advise going for a tech stack that is still supported.
For example, you could set up a Galera Cluster with MariaDB on Ubuntu 20.04 Server as described here:
Best,
Bobby