解决cron无法运行报错：FAILED

解决cron无法运行报错：FAILED to authorize user with PAM (Module is unknown)

查看cron运行日志
tail -f /var/log/cron
报如下错误：

May  8 10:14:01 localhost crond[9399]: (root) FAILED to authorize user with PAM (Module is unknown)
May  8 10:14:01 localhost crond[9400]: (root) FAILED to authorize user with PAM (Module is unknown)

网上有如下解决方法：
禁用SELinux,可以使用getenforce命令查看是否禁用。
修改/etc/pam.d/crond，把把所有required改成sufficient，这个可能对非root用户管用。

account    required   pam_access.so
account    include    password-auth
session    required   pam_loginuid.so
session    include    password-auth
auth       include    password-auth

最终解决办法：
重启crond服务

/etc/init.d/crond restart

参考文献：https://zhang.ge/5093.html