到官网https://dev.mysql.com/downloads/下载mysql

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wget https://repo.mysql.com//mysql80-community-release-el7-1.noarch.rpm
yum -y install mysql80-community-release-el7-1.noarch.rpm

安装MySQL服务器

yum -y install mysql-community-server

安装完成之后启动MySQL服务

systemctl start mysqld.service

查看状态

systemctl status mysqld.service

获取初始密码

grep "password" /var/log/mysqld.log

输入初始密码，此时不能做任何事情，因为MySQL默认必须修改密码之后才能操作数据库；但是，因为MySQL有密码设置的规范，密码设置太过简单会报错，具体是与validate_password_policy的值有关；然后不修改密码就不能修改validate_password_policy，所以我在这里先将密码修改，改成一个满足要求的密码，然后在进行validate_password_policy的修改。

mysql -uroot -p
ALTER USER 'root'@'localhost' IDENTIFIED BY 'Hadoop3!';

允许远程连接

CREATE USER 'admin'@'%' IDENTIFIED BY 'Hadoop3!';
grant all privileges on *.* to 'admin'@'%';
#mac下navicat连接不上，需要修改语句：
CREATE USER 'admin'@'%' IDENTIFIED WITH mysql_native_password BY 'Hadoop3!';
或者ALTER USER 'admin'@'%' IDENTIFIED WITH mysql_native_password BY 'Hadoop3!';
grant all privileges on *.* to 'admin'@'%';
flush privileges;