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：

• 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 needed
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