Linux 解決 crontab 拒絕存取：pam 配置導致密碼過期問題

Linux 解決 crontab 拒絕存取：pam 配置導致密碼過期問題

若執行 crontab -l 遇到錯誤：

You (zhangsan) are not allowed to access to (crontab) because of pam configuration.

原因可能是使用者 zhangsan 密碼過期。嘗試以密碼登入時會提示需立即修改密碼：

You are required to change your password immediately (password aged)
Changing password for zhangsan.
(current) UNIX password:

若為 Hadoop 叢集需免密碼登入，密碼不能過期。可用 chage 查看實際狀況 (需 root)：

# 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

顯示每 90 天需修改密碼，到期前 7 天警告。為讓密碼永久有效：

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

問題即可解決。