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

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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/cron.allow，添加

rootmyuser

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。

## The PAM configuration file for the cron daemon### No PAM authentication called, auth modules not neededaccount    required   pam_access.soaccount    include    password-authsession    required   pam_loginuid.sosession    include    password-authauth       include    password-auth

最终解决办法：

重启crond服务

/etc/init.d/crond restart

参考：

https://www.centos.org/forums/viewtopic.php?t=61414
https://opensource4admin.wordpress.com/2014/07/31/failed-to-authorize-user-with-pam-module-is-unknown-solved/
http://bluemood.blog.51cto.com/1142811/953078/
http://www.linuxquestions.org/questions/linux-security-4/failed-to-authorize-user-with-pam-permission-denied-4175492110-print/

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