用mysqladmin修改密码(mysqladmin –u root password “mysql”)提示
mysqladmin:Can't turn off logging; error: 'Access denied; you need the SUPER privilege forthis operation'
解决办法：
修改mysql登录设置
vi /etc/my.cnf (我们发现etc下没有my.cnf文件)
通过查询知道，安装完MySQL 后，/etc/my.cnf 文件默认是不存在的，可以在/usr/share/doc/MySQL-servercommunity下找到my-huge.cnf 、my-innodb-heavy-4G.cnf 、my-large.cnf 、mymedium.cnf 、my-small.cnf 等文件，根据内存大小将其中合适你机器配置的文件拷贝到/etc/my.cnf（一般应用选mymedium.cnf即可）
编辑my.cnf文件
在[mysqld]段中加入 skip-grant-tables
保存之后重启mysql服务
/etc/rc.d/init.d/mysql restart
重启mysql服务之后修改mysql密码
[root@shiyue]# mysql
Welcome to the MySQL monitor. Commands endwith ; or \g.
Your MySQL connection id is 3 to server version: 3.23.56
Type 'help;' or '\h' for help. Type '\c' to clear the buffer.
mysql> use mysql ;
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A
Database changed
mysql> UPDATE user SET Password = password ( 'mysql' ) WHERE User = 'root' ;
Query OK, 0 rows affected (0.00 sec)
Rows matched: 2 Changed: 0 Warnings: 0
mysql> flush privileges ;
Query OK, 0 rows affected (0.01 sec)
mysql> quit
Bye
退出mysql之后把刚修改的配置文件改回来(vi /etc/my.cnf)
重启mysql服务
mysql-u root -p登录mysql
登陆成功！
再通过navicat连接mysql数据库，提示Can't get hostname for your address
解决方法还是修改my.cnf文件，在[mysqld] 下面添加一行：skip-name-resolve，保存重启mysql(/etc/init.d/mysql restart)
赋权：
Mysql –u root –p mysql
Show databases
Use mysql
grant all on *.* to 'root'@'192.168.1.254'identified by 'mysql';
quit
好重新用navicat进行连接，OK，测试通过！