root用户删除后MYSQL重置密码

删除root用户

drop user root@'localhost';

停止Mysql

service mysql stop

进入安全模式

mysqld_safe --skip-grant-tables --skip-networking &

添加用户并修改密码

INSERT INTO user SET User='root',Host='localhost',ssl_cipher='',x509_issuer='',x509_subject='';
update user set password=password("654321") where user="root";
或
insert into user(user,host,password,ssl_type,ssl_cipher,x509_issuer,x509_subject) values('root','localhost',PASSWORD('123'),'','','','');

mysql重新启动

service mysql stop
service mysql start

忘记密码

5.6以前版本
update mysql.user set password=PASSWORD('123') where user='oldboy' and host='10.0.0.%';
flush privileges;

5.7版本
update mysql.user set authentication_string=PASSWORD('123') where user='oldboy' and host='10.0.0.%';