这个问题通常在laravel中表现为类似下边的异常：
local.ERROR: SQLSTATE[HY000] [2006] MySQL server has gone away {"exception":"[object] (PDOException(code: 2006): SQLSTATE[HY000] [2006] MySQL server has gone away at...
找到你的my.cnf,在[mysqld]下增加一行
1 default-authentication-plugin=mysql_native_password