rpm -qa|grep mariadb
rpm -e mariadb-libs --nodeps

cd /cd usr/localmkdir mysql

cd mysqlwget https://dev.mysql.com/get/Downloads/MySQL-8.0/mysql-8.0.16-2.el7.x86_64.rpm-bundle.tar

tar -xvf mysql-8.0.16-2.el7.x86_64.rpm-bundle.tar

rpm -ivh mysql-community-common-8.0.16-2.el7.x86_64.rpm --nodeps --forcerpm -ivh mysql-community-libs-8.0.16-2.el7.x86_64.rpm --nodeps --forcerpm -ivh mysql-community-client-8.0.16-2.el7.x86_64.rpm --nodeps --forcerpm -ivh mysql-community-server-8.0.16-2.el7.x86_64.rpm --nodeps --force

mysqld --initialize; chown mysql:mysql /var/lib/mysql -R;
systemctl start mysqld.service;systemctl enable mysqld;

cat /var/log/mysqld.log | grep password

mysql -uroot -p

 ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY 'xxxxx';

exit; mysql -uroot -p

create user 'root'@'%' identified with mysql_native_password by 'xxxxx';grant all privileges on *.* to 'root'@'%' with grant option;flush privileges;