CDN的理解-应不应该开启CDN是什么

对于我们站长来说,CDN是个很重要的东西,今天就讲一下我对CDN的一个理解(如果网友们发现有问题还请指出):

        官方词汇是叫《内容分发网络》,说白了就是加速,像我们打开一个网站,用户访问的时候会去下载一部分的资源文件,其中又包括HTML代码以及静态资源(css,js,图片等),而由于我们的服务器网络带宽普遍不是很高,一般都是1M的小水管,单台服务器下载速度就被限制在100KB左右。那么当多个用户访问时,服务器就要向多个设备发送这些资源文件,如果说被限制了,那相当于堵车,其他用户就无法获取到程序的资源文件,需要等别的用户下载完了,然后服务器才有额外的带宽来发送文件给剩下的用户。这在高并发的情况下是很影响用户体验的,特别是有的网站上放了很多很多的图片,这个时候我们服务器原本的带宽就不够用了,而升级带宽的费用又很高,那么在这种情况下,我们就可以使用CDN来对我们的这些资源文件进行存储,当用户访问我们的网站时,会优先去CDN上拿资源(有的CDN需要配置缓存规则),而CDN本身是由那些很大的CDN服务商提供的,他们的机房都是以G口来算的,而且没有网速限制,一秒几M或者十几M都很正常。相对于我们一般只有几百KB的网站资源来说,这绝对够用了。
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                说完带宽,又要提到一个东西,就是地域性。由于物理条件限制,不可能每个人都住在网站的服务器旁边,那么在访问时候,如果服务器地址离用户过远,那么也会影响速度。而我们服务器又只有一个,还不能挪动,这个时候CDN也能起到作用,它是一种分布式的结构,前面我们提到了,CDN会缓存我们的资源文件,在用户访问的时候就直接去CDN拿,这是它的缓存机制。还有一个就是多节点分布,CDN也是服务器,但它不止一个,可能有几百个或者几千个,那么当用户访问的时候就会去判断,优先选择离自己近的,然后再去请求资源文件,这在一定程度上又能提高网站速度。
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                最后总结一下,如果说大家的带宽不足,并且站内有很多的图片或者静态资源,那么博主推荐大家使用CDN。
                新手的话推荐使用百度云加速,速度还是很快的,并且还有SEO功能(死链提交,新站报道等),最主要是免费。本站的演示站点也是放在百度云加速上的,如果有配置方面的问题,欢迎在文章下留言,我看到了会回复的哦。


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作者:徐先森 文章名: 《CDN的理解-应不应该开启CDN是什么》
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