有没有办法检查主机是否启动? [英] Is there a way to check if a host is up?

问题描述

我正在尝试用PHP做到这一点.我需要检查指定主机是否启动"

I'm trying to do this in PHP. I need to check if a specified host is "up"

我考虑过对指定的主机执行ping操作(尽管我不确定如何执行此操作，因为这将需要root用户.--help此处?)

I thought of pinging the specified host (though I'm not sure how I would, since that would require root. --help here?)

虽然我也使用fsockopen()尝试在指定的端口上进行连接，但是如果主机未在该端口上侦听连接，那也将失败.

I also though of using fsockopen() to try to connect on a specified port, but that would fail too, if the host wasn't listening for connections on that port.

另外，一些主机会阻止ping请求，那么我该如何解决呢?不过，这部分不是必需的，因此不必为此担心太多.我意识到这一点可能会很棘手.

Additionally, some hosts block ping requests, so how might I get around this? This part isn't a necessity, though, so don't worry about this too much. I realize this one might get tricky.

推荐答案

我通常为公共页面做一个简单的cURL，看看它是否返回200.如果得到500、404或除200响应之外的任何内容，知道有什么鱼腥了.

I typically do a simple cURL for a public page and see if it returns a 200. If you get a 500, 404, or anything besides a 200 response you know something fishy is up.

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