到官網https://dev.mysql.com/downloads/下載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

安裝MySQL服務器

yum -y install mysql-community-server

安裝完成之后啟動MySQL服務

systemctl start mysqld.service

查看狀態

systemctl status mysqld.service

獲取初始密碼

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

輸入初始密碼，此時不能做任何事情，因為MySQL默認必須修改密碼之后才能操作數據庫；但是，因為MySQL有密碼設置的規范，密碼設置太過簡單會報錯，具體是與validate_password_policy的值有關；然后不修改密碼就不能修改validate_password_policy，所以我在這里先將密碼修改，改成一個滿足要求的密碼，然后在進行validate_password_policy的修改。

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

允許遠程連接

CREATE USER 'admin'@'%' IDENTIFIED BY 'Hadoop3!';
grant all privileges on *.* to 'admin'@'%';
#mac下navicat連接不上，需要修改語句：
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;