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mysql 不能改密码

刚安装的mysql 数据库 想把mysql的密码改为4892645  操作如下
#hostname
显示的主机名是yihao
# service  mysqld start

#/usr/bin/mysqladmin -u root -h yihao password  '4892645'
然后就报错 报错的内容是
/usr/bin/mysqladmin: connect to server at 'yihao' failed
error : 'unkonown MYsql server host 'yihao'(2)'
Check that mysqld is running on yihao and that the port is 3306
you can check this by doing 'telnet yihao 3306'
请问是什么原因