下载tar包 https://dev.mysql.com/get/Downloads/MySQL-8.0/mysql-8.0.15-1.el7.x86_64.rpm-bundle.tar

yum install -y lrzsz

在/usr/local目录下新建目录mysql
cd /usr/local
mkdir mysql

在/usr/local/mysql目录下使用rz -be命令上传mysql-8.0.15-1.el7.x86_64.rpm-bundle.tar

tar -xvf mysql-8.0.15-1.el7.x86_64.rpm-bundle.tar
得到文件如图：

rpm -qa | grep mariadb 命令查看 mariadb 的安装包

rpm -e mariadb-libs-5.5.60-1.el7_5.x86_64 --nodeps 卸载mariadb

再次执行6查看

rpm -ivh mysql-community-common-8.0.15-1.el7.x86_64.rpm --nodeps --force 命令安装 common

依次： libs,client,server

rpm -qa | grep mysql

初始化
mysqld --initialize;
[root@1234 mysql]# mysqld --initialize;
mysqld: error while loading shared libraries: libaio.so.1: cannot open shared object file: No such file or directory
yum install -y libaio安装依赖

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

cat /var/log/mysqld.log | grep password查看密码

登录后修改密码：
ALTER USER ‘root’@‘localhost’ IDENTIFIED WITH mysql_native_password BY ‘root’;

授权
create user ‘root’@’%’ identified with mysql_native_password by ‘root’;
grant all privileges on . to ‘root’@’%’ with grant option;
flush privileges;