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/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