Install MySQL 5.7 on CentOS 8

yum repolist all | grep mysql
  147  sudo dnf remove @mysql
  148  sudo dnf module reset mysql
  149  sudo dnf module disable mysql
  150  sudo vi /etc/yum.repos.d/mysql-community.repo

[mysql57-community]
name=MySQL 5.7 Community Server
baseurl=http://repo.mysql.com/yum/mysql-5.7-community/el/7/$basearch/
enabled=1
gpgcheck=0

[mysql-connectors-community]
name=MySQL Connectors Community
baseurl=http://repo.mysql.com/yum/mysql-connectors-community/el/7/$basearch/
enabled=1
gpgcheck=0

[mysql-tools-community]
name=MySQL Tools Community
baseurl=http://repo.mysql.com/yum/mysql-tools-community/el/7/$basearch/
enabled=1
gpgcheck=0


  151  sudo dnf config-manager --disable mysql80-community
  152  sudo dnf config-manager --enable mysql57-community
  153  sudo dnf install mysql-community-server
  154  rpm -qi mysql-community-server 
  155  sudo systemctl enable --now mysqld.service
  156  sudo grep 'A temporary password' /var/log/mysqld.log |tail -1
  157   sudo mysql_secure_installation


#lib 
wget 'https://dev.mysql.com/get/mysql57-community-release-el7-11.noarch.rpm'
  rpm -ivh mysql57-community-release-el7-11.noarch.rpm
 sudo dnf install -y mysql-community-devel

https://computingforgeeks.com/install-mysql-5-7-on-centos-rhel-linux/

Centos8 yum镜像安装&阿里云安装Mysql 5.7