not allowed to access to crontab because of pam configuration
如果運行crontab如遇下面這樣的錯誤：
$ crontab -l
You (zhangsan) are not allowed to access to (crontab) because of pam configuration.
原因可能是因為使用者zhangsan密碼到期了。當嘗試以密碼登入時，會報提示需要立即修改密碼：
$ su - zhangsan
Password:
You are required to change your password immediately (password aged)
Changing password for zhangsan.
(current) UNIX password:
如果正好是hadoop叢集，由於需要免密碼登入，密碼不能到期。
可以使用命名chage查看實際情況，比如（請以root使用者運行）：
#chage -l zhangsan
Last password change : Nov 23, 2015
Password expires : Feb 21, 2016
Password inactive : never
Account expires : never
Minimum number of days between password change : 0
Maximum number of days between password change : 90
Number of days of warning before password expires : 7
從上可以看到：每90天需要修改一次密碼，密碼到期前7天會警示。
為了讓密碼永久有效，可這樣設定一下：
chage -M 99999 zhangsan
再次查看：
#chage -l zhangsan
Last password change : Nov 23, 2015
Password expires : never
Password inactive : never
Account expires : never
Minimum number of days between password change : 0
Maximum number of days between password change : 99999
Number of days of warning before password expires : 7
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