发现Exadata上的OS用户过期了，虽然知道Exadata上的OEL在用户密码上的要求进行了加强，但是發現OS用戶的密码的有效期只有90天，这样的话每90天就要修改一次密码，太麻煩了，就都改成了不收限制：
查看用户的密码有效期：
[root@dm01cel01 ~]# chage -l root
Last password change : Aug 09, 2012
Password expires : Nov 07, 2012
Password inactive : never
Account expires : never
Minimum number of days between password change : 1
Maximum number of days between password change : 90
Number of days of warning before password expires : 7
[root@dm01cel01 ~]# chage -l celladmin
Last password change : password must be changed
Password expires : never
Password inactive : never
Account expires : never
Minimum number of days between password change : 1
Maximum number of days between password change : 90
Number of days of warning before password expires : 7
[root@dm01cel01 ~]# chage -l cellmonitor
Last password change : May 10, 2012
Password expires : Aug 08, 2012
Password inactive : never
Account expires : never
Minimum number of days between password change : 1
Maximum number of days between password change : 90
Number of days of warning before password expires : 7
[root@dm01cel01 ~]# chage -l public
Last password change : Aug 02, 2012
Password expires : Oct 31, 2012
Password inactive : never
Account expires : never
Minimum number of days between password change : 1
Maximum number of days between password change : 90
Number of days of warning before password expires : 7
[root@dm01cel01 ~]#
注：上面的celladmin用户的Password expirs显示为never，并不是说该用户的用户密码永不过期，而是因为该用户的密码已经过期了Password must be changed
修改，99999表示永不过期Never：
chage -M 99999 root
chage -M 99999 celladmin
chage -M 99999 cellmonitor
chage -M 99999 public
[root@dm01cel01 ~]# chage -l root
Last password change : Aug 09, 2012
Password expires : never
Password inactive : never
Account expires : never
Minimum number of days between password change : 1
Maximum number of days between password change : 99999
Number of days of warning before password expires : 7
[root@dm01cel01 ~]# chage -l celladmin
Last password change : password must be changed
Password expires : never
Password inactive : never
Account expires : never
Minimum number of days between password change : 1
Maximum number of days between password change : 99999
Number of days of warning before password expires : 7
[root@dm01cel01 ~]# chage -l cellmonitor
Last password change : May 10, 2012
Password expires : never
Password inactive : never
Account expires : never
Minimum number of days between password change : 1
Maximum number of days between password change : 99999
Number of days of warning before password expires : 7
[root@dm01cel01 ~]# chage -l public
Last password change : Aug 02, 2012
Password expires : never
Password inactive : never
Account expires : never
Minimum number of days between password change : 1
Maximum number of days between password change : 99999
Number of days of warning before password expires : 7
其他节点上的用户使用同样操作即可。