1、下载命令
wget https://dev.mysql.com/get/mysql57-community-release-el7-9.noarch.rpm
2、yun源安装命令
rpm -ivh mysql57-community-release-el7-9.noarch.rpm
3、使用yum命令安装mysql
yum -y install mysql-server
4、启动mysql
systemctl start mysqld
5、检查是否安装启动成功
systemctl status mysqld
6、查看默认密码
grep 'temporary password' /var/log/mysqld.log
7、登录修改密码
mysql -u root -p
8、修改密码
因为5.7及以上版本的数据库对密码做了强度要求，默认密码的要求必须是大小写字母数字特殊字母的组合且至少要8位长度
ALTER USER 'root'@'localhost' IDENTIFIED BY '新的密码';
alter user user() identified by "密码";
9、允许远程登录
GRANT ALL PRIVILEGES ON *.* TO 'root'@'%' IDENTIFIED BY '密码' WITH GRANT OPTION;
10、如仍然无法访问则需关闭防火墙或者开放3306端口访问权限
附：CentOS 7 关闭防火墙命令
systemctl stop firewalld.service
systemctl disable firewalld.service
11、查看端口号
show global variables like 'port';
12、查看防火墙状态：
systemctl status firewalld
13、开放端口放行：
firewall-cmd --zone=public --add-port=3306/tcp --permanent
加上--permanet参数永久生效，如果前面修改了端口号，此处的3306就应改成对应的端口号，然后使用命令重新读取防火墙规则：
firewall-cmd --reload
Centos7离线安装mysql8 https://www.cnblogs.com/quchunhui/p/11115339.html
https://www.cnblogs.com/blackmanzhang/p/11062817.html