步骤如下：
vi /etc/sudoers
加上一句 apache ALL=(ALL) NOPASSWD: ALL
然后在php中加上sudo就可以执行任何命令了
exec("sudo reboot");
?>
如果系统运行sudo 反应速度非常慢
可以进行如下操作进行提升速度
用"hostname "命令查看当前主机的主机名称。例如，该命令返回"www.siteyun.com ".
再用vi打开"/etc/hosts"文件，并将"ddx.net"加入到 "127.0.0.1"这行中。
例如：
127.0.0.1 www.siteyun.com localhost.localdomain localhost
保存搞定。
本人用PHP来控制一些服务器重启，及些服务的重启等操作
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