1.下载，进入mysql官网，查找需要的版本；
wget https://dev.mysql.com/get/Downloads/MySQL-5.7/mysql-community-server-5.7.29-1.el7.x86_64.rpm
2.安装mysql包
rpm -ivh mysql-community-server-5.7.29-1.el7.x86_64.rpm
报如下图错误，提示依赖mysql-community-client，mysql-community-common-5.7.29
wget下载这些包，rpm -ivh *.rpm （安装rpm包） #RPM软件包管理器，-i 安装rpm包，-vh显示安装进度；最终发现需要安装这4个；
3.开启mysql服务
systemctl start mysqld.service
查看mysql状态：systemctl status mysqld.service
4.查看mysql临时密码,grep "password" /var/log/mysqld.log;
修改密码：ALTER USER 'root'@'localhost' IDENTIFIED BY 'P@ssw0rd';
5.上述设置，无法使用navicat for mysql远程连接mysql,需设置host为%，具体步骤如下：
mysql -uroot -pP@ssw0rd
use mysql; #使用mysql数据库
update user set host='%'' where user='root' ;
flush privileges;