mysql 5.6提高了安全性，默認安裝完之后，不允許空密碼登錄，而是在/root/.mysql_secret,記錄了密碼，所以首次登錄，必須用這個文件里面的密碼登錄

[root@nagios ~]# cat .mysql_secret

# The random password set for the root user at Mon Oct 28 17:24:41 2013 (local time): Zirbdc2P

[root@nagios ~]# mysql -p

Enter password:

Welcome to the MySQL monitor. Commands end with ; or \g.

Your MySQL connection id is 4

Server version: 5.6.13

mysql> use mysql;

ERROR 1820 (HY000): You must SET PASSWORD before executing this statement

mysql> set password=password('123456');

Query OK, 0 rows affected (0.10 sec)

必須強制你修改密碼，否則不讓操作，必須用set password命令修改，修改后

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

總結

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