MySQL 5.7更改Root密碼和Host

MySQL5.7對用戶密碼管理對更爲嚴格。

爲測試方便，須要將root對權限擴大爲全部host。具體操做以下：

grep 'temporary password' /var/log/mysqld.log
2019-05-14T04:58:05.705428Z 1 [Note] A temporary password is generated for root@localhost: lXOe3R-jhV6W

mysql -uroot -plXOe3R-jhV6W

alter user 'root'@'localhost' identified by 'xxxxxxx'; 

uninstall plugin validate_password;

alter user 'root'@'localhost' identified by 'xxxx';

GRANT ALL ON *.* TO 'root'@'%' IDENTIFIED BY 'xxxx;

附CentOS7安裝MySQL5.7的命令：

yum localinstall https://dev.mysql.com/get/mysql57-community-release-el7-9.noarch.rpm

yum install mysql-community-server