1.查找初始密码

cat /var/log/mysqld.log | grep password

2.登录到mysql

3.修改密码

3-1 设置密码的检查机制

–修改策略

set global validate_password.policy=0;
set global validate_password.length=4;

修改密码

alter user 'root'@'loaclhost' identified by '1234';

授权远程登陆

create user 'root'@'%' identified by '1234';
grant all privileges on *.* to 'root'@'%' with grant option;
flush PRIVILEGES;