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架构.html
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<!DOCTYPE html>
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<title>
架构 - 搁羽念风
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<h1 class="entry-title"><a href="15529898481691.html">架构之CDN相关</a></h1>
<p class="meta"><time datetime="2019-03-19T18:04:08+08:00"
pubdate data-updated="true">2019/3/19</time></p>
</header>
<div class="entry-content">
<h2 id="toc_0">介绍</h2>
<p>CDN使用背景，图片的分布式存储</p>
<p>CDN 网络原理概述</p>
<p>批量添加、切换 CDN 的步骤和注意事项</p>
<p>多 CDN 切换的步骤和注意事项</p>
<p>CDN 访问故障分析</p>
<h2 id="toc_1">常见用法</h2>
<h3 id="toc_2">图片和静态资源的缓存</h3>
<h3 id="toc_3">一些变化不频繁的api缓存</h3>
<h2 id="toc_4">原理</h2>
<blockquote>
<p><code>wget -S -O /dev/null https://wx2.sinaimg.cn/crop.0.0.2000.1125/005K1HRGly1fzfme5l6ltj31jk0v9wm4.jpg</code></p>
</blockquote>
<h3 id="toc_5">一) 请求dns解析,并cname到cdn厂商的域名</h3>
<p><img src="media/15529898481691/15529924669316.jpg" alt="" style="width:1272px;"/></p>
<h3 id="toc_6">二) 再次请求dns解析,并获取到cdn厂商的全局负载均衡ip列表</h3>
<p><img src="media/15529898481691/15529924844889.jpg" alt="" style="width:1277px;"/></p>
<h3 id="toc_7">三) 全局负载均衡 根据客户端的<code>ip</code>,<code>url</code> 等信息内部请求 <code>区域负载均衡系统</code></h3>
<ol>
<li> <code>区域负载均衡</code>根据信息,逐层查找,获取离客户端<code>最近&有资源</code>的<code>缓存服务器</code>地址,</li>
<li> 返回给<code>全局负载均衡</code>(回源发生在这个阶段)</li>
<li> <code>全局负载均衡</code> 返回给客户端 该<code>缓存服务器</code>地址</li>
</ol>
<h3 id="toc_8">客户端请求<code>缓存服务器</code>,拿到文件</h3>
<p><img src="media/15529898481691/15529924296541.jpg" alt="" style="width:960px;"/></p>
<h2 id="toc_9">关键字</h2>
<h3 id="toc_10">回源</h3>
<blockquote>
<p>回源的意思就是,回到源头服务器取资源, 因为cdn为多级缓存,当请求资源404时,将逐层向上级cdn缓存获取资源,直至到服务器源站查找资源</p>
</blockquote>
<h3 id="toc_11">资源获取方式</h3>
<h4 id="toc_12">pull</h4>
<blockquote>
<p>逐层查找,资源不存在,最终到源头服务器获取资源并缓存到各级cdn</p>
</blockquote>
<h4 id="toc_13">push</h4>
<blockquote>
<p>源头服务器主动上传资源到cdn缓存服务器</p>
</blockquote>
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