Centos7 下Mysql更改密码

1.vim /etc/my.cnf
2.在[mysqld]中添加
skip-grant-tables

# read_rnd_buffer_size = 2M
skip-grant-tables
datadir=/var/lib/mysql
socket=/var/lib/mysql/mysql.sock

3.重启mysql
systemctl restart mysqld.service
4.用户无密码登录
mysql -uroot -p (直接点击回车，密码为空)
5.选择数据库
use mysql;
6.修改root密码
update mysql.user set authentication_string=password('新密码') where user='用户';
7.执行
flush privileges;
8.退出 mysql
quit
9.编辑 /etc/my.cnf
删除 skip-grant-tables 保存退出
10.重启mysql
systemctl restart mysqld.service