Permission denied You (root) are not allowed to access to (crontab) because of pam configuration.
第一步，查看/etc/pam.d/crond有如下一句
account required pam_access.so
第二步，查看/etc/security/access.conf有如下一句
+ : root : cron crond :0 tty1 tty2 tty3 tty4 tty5 tty6
转载于:https://blog.51cto.com/junlinux/1395786