Install MySQL 5 on CentOS 8 / RHEL 8

CentOS 8 / RHEL 8 預設 MySQL 版本是 8
若要裝 MySQL 5，需將 8 的設定移除，再裝 5 的 repo

dnf remove @mysql
dnf module reset mysql
dnf module disable mysql
rpm -ivh https://repo.mysql.com/mysql57-community-release-el7-11.noarch.rpm
dnf -y install mysql-community-client mysql-community-common mysql-community-devel mysql-community-libs mysql-community-server
systemctl enable --now mysqld