1. service MysqLd stop

2. vi /etc/my.cnf

3.在[MysqLd]片段中开始新增skip-grant-tables，保存退出vi

4.service MysqLd start

5.MysqL -u root MysqL，进入MysqL

6.MysqL>use MysqL;

7.MysqL>update user set password=PASSWORD(’111111’) where user=’root’;

如果找不到password字段，是因为MysqL5.7版本password字段改成了authentication_string，用以下语句即可

MysqL>update user set authentication_string=password('111111') where user='root' ;

7.MysqL>flush privileges;

8.MysqL>quit;

9.vi /etc/my.cnf，删除skip-grant-tables，保存退出vi

10.service MysqLd start

11.MysqL -u root -p，此时输入密码即可。