如果运行crontab如遇下面这样的错误: $ crontab -l You (zhangsan) are not allowed to access to (crontab) because of pam configuration. 原因可能是因为用户zhangsan密码过期了。当尝试以密码登录时,会报提示需要立即修改密码: $ 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集群,由于需要免密码登录,密码不能过期。 可以使用命名chage查看实际情况,比如(请以root用户运行): #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 从上可以看到:每90天需要修改一次密码,密码到期前7天会告警。 为了让密码永久有效,可这样设置一下: 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