centos7+ 安装 mysq 5.7 https://www.linuxidc.com/Linux/2016-09/135288.htm

set global validate_password_policy=0;

set global validate_password_length=4;

再授权

GRANT ALL PRIVILEGES ON *.* TO 'root'@'%' IDENTIFIED BY 'root' WITH GRANT OPTION;

初次安装完使用后报：MySQL Packet for query is too large

解决办法：

1.首先在控制台查询一下：SHOW VARIABLES LIKE '%max_allowed_packet%';

2.set global max_allowed_packet = 5*1024*1024*10;

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