1.官网下载MySQL 8.0 社区版

2.进入/usr/local，创建mysql目录

cd /usr/local

mkdir mysql

3.用Xftp上传到/usr/local/mysql

4.卸载mariadb

rpm -qa | grep mariadb

rpm -e mariadb-libs-5.5.68-1.el7.x86_64 --nodeps

5.解压tar包

tar -xvf mysql-8.0.26-1.el7.x86_64.rpm-bundle.tar

6.安装  rpm -ivh xxxxxx.rpm

必须安装：

mysql-community-client-8.0.26-1.el7.x86_64.rpm

mysql-community-client-plugins-8.0.26-1.el7.x86_64.rpm

mysql-community-common-8.0.26-1.el7.x86_64.rpm

mysql-community-libs-8.0.26-1.el7.x86_64.rpm

mysql-community-server-8.0.26-1.el7.x86_64.rpm

不用安装：

mysql-community-devel-8.0.26-1.el7.x86_64.rpm

mysql-community-embedded-compat-8.0.26-1.el7.x86_64.rpm

mysql-community-libs-compat-8.0.26-1.el7.x86_64.rpm

mysql-community-test-8.0.26-1.el7.x86_64.rpm

7.安装时若缺少依赖（perl）

yum install perl.x86_64

8.初始化mysql

mysqld --initialize

9.启动mysql

service mysqld start

service mysqld status

10.启动报错，需给mysql用户分配权限

chown -R mysql:mysql /var/lib/mysql/

10.修改密码

mysql -u root -p

输入上面初始化生产密码：hDT5rr0KWd?_

ALTER USER 'root'@'localhost' IDENTIFIED BY 'new_password';

11.修改权限为所有机器可访问

show databases;

use mysql；

select host, user, authentication_string, plugin from user;

localhost为本机可访问，%为所有机器可访问

12.防火墙打开端口：

firewall-cmd --add-port=3306/tcp --zone=public --permanent

firewall-cmd --reload

参考文章：

CentOS7安装MySQL8.0图文教程_闰土的猹猹君的博客-CSDN博客_centos7安装mysql8.0

Centos7离线安装mysql8 - 大墨垂杨 - 博客园