1.先删除之前安装的mysql

通过 rpm -qa | grep mariadb和rpm -qa | grep mysql 命令查看 mariadb 和mysql 的安装包
rpm -e 包名删除所有的安装包

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2.从官网获取下载链接

如图选择版本, 点击Download

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右键点击No thanks, 复制链接

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3. 下载mysql安装包

1.创建mysql目录 mkdir /usr/local/mysql
2.进入刚才创建的目录cd /usr/local/mysql
3.下载文件 wget https://dev.mysql.com/get/Downloads/MySQL-8.0/mysql-8.0.23-1.el7.x86_64.rpm-bundle.tar

4.安装mysql

1. tar -xvf mysql-8.0.23-1.el7.x86_64.rpm-bundle.tar解压tar包
   2.安装common, libs, client, server
   rpm -ivh mysql-community-common-8.0.23-1.el7.x86_64.rpm --nodeps --force
rpm -ivh mysql-community-libs-8.0.23-1.el7.x86_64.rpm --nodeps --force
rpm -ivh mysql-community-client-8.0.23-1.el7.x86_64.rpm --nodeps --force
rpm -ivh mysql-community-server-8.0.23-1.el7.x86_64.rpm --nodeps --force
   3.查看刚才安装的包rpm -qa | grep mysql
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   4.初始化数据库相关配置
   mysqld --initialize
chown mysql:mysql /var/lib/mysql -R
systemctl start mysqld.service
systemctl enable mysqld

5.查看随机生成的密码cat /var/log/mysqld.log | grep password

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6.修改密码

mysql -uroot -p进入数据库, 输入刚才看到的密码
ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY '密码'; 修改密码
exit退出mysql, 使用新密码重新登录

7. 设置数据库允许远程连接

mysql -u root -p
use mysql;
select host, user, authentication_string, plugin from user;
// 允许远程主机连接
update mysql.user set host='%' where user='root';
// 修改加密方式
ALTER USER 'root'@'%' IDENTIFIED WITH mysql_native_password BY '123456';
// 刷新权限
FLUSH PRIVILEGES;

// 开启系统防火墙
firewall-cmd --zone=public --add-port=3306/tcp --permanent
firewall-cmd --reload 

// 配置文件解决sql_mode 'only_full_group_by' 报错
[mysqld]
user=mysql
default-storage-engine=INNODB
character-set-server=utf8
default_authentication_plugin=mysql_native_password
sql_mode='STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_ENGINE_SUBSTITUTION'
[client]
default-character-set=utf8
[mysql]
default-character-set=utf8