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<h1 id="Envoy-使用"><a href="#Envoy-使用" class="headerlink" title="Envoy 使用"></a>Envoy 使用</h1><h2 id="Envoy的介绍"><a href="#Envoy的介绍" class="headerlink" title="Envoy的介绍"></a>Envoy的介绍</h2><p>Envoy诞生于云原生流行之时，当微服务开发架构成为主流，需要管理和维护的应用越来越多，服务与服务之间的相互通信越来越复杂。Envoy的出现，提供了一个通用的代理层，处理不同服务之间的网络通信，并且通过强大的控制平台来管理这些通信。</p>
<p>Envoy是一个面向大规模现代服务架构而设计的7层负载和消息总线。主要信念是认为网络对应用程序应该是透明的。当出现网络和应用问题时，应该能够轻松找到问题的原因。其实Envoy的本质是网络代理，它可以代理你的应用服务。它主要的功能涵盖：L3/L4/L7代理、HTTP/2的支持、HTTP/3目前处于alpha阶段、GRPC支持、服务发现和动态配置、健康检查、负载均衡、流量管理、边缘代理支持、可观测性。</p>
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<h1 id="容器网络-三层网络解决方案"><a href="#容器网络-三层网络解决方案" class="headerlink" title="容器网络 - 三层网络解决方案"></a>容器网络 - 三层网络解决方案</h1><p>前面两篇了解了kubernetes容器网络和CNI插件的主要工作原理。除了这种模式外，还有一种纯三层的网络方案，如Flannel的host-gw和Calico项目。</p>
<p>先看一下flannel的host-gw 示意图：</p>
<p><img src="/images/qiniu/image-20230629173437200.png" alt="image-20230629173437200"></p>
<p>你在主机上用<code>ip route</code>可以看到一个规则：</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">10.244.1.0/24 via 10.168.0.3 dev eth0</span><br></pre></td></tr></table></figure>
<p>这个规则的含义就是，ip地址属于10.244.1.0/24网段的ip包，应该通过本机的eth0设备发出去(dev eth0)，并且它的下一跳地址是10.168.0.3(via 10.168.0.3)。</p>
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<a class="post-title-link" href="/2023/04/15/kubernetes-container-network-2/" itemprop="url">容器网络 - CNI网络插件</a></h1>
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<h1 id="容器网络-CNI网络插件"><a href="#容器网络-CNI网络插件" class="headerlink" title="容器网络 - CNI网络插件"></a>容器网络 - CNI网络插件</h1><p>上一篇里面，我们讲了容器网络，跨主机网络通信(flannel的udp和vxlan)；这里我们再了解一下cni它是怎么实现的，然后再说一下另一种网络模型HostGW。</p>
<p>跨主机通信中，不管是udp模式，还是vxlan模式，他们都有一个相同点，用户的容器连在了docker0网桥上。网络插件在主机上创建一个特殊的设备(UDP模式创建的TUN设备，VXLAN模式创建VTEP设备)；docker0与这个设备配合，通过ip转发(路由表)协作。</p>
<p>网络插件真正要做的事情，是把不同主机上的特殊设备通过某种方法连通，达到容器跨主机网络通信的目的。kubernetes 通过 CNI 的接口，单独维护了一个网桥代替docker0，名字叫CNI网络，宿主机上的设备默认名称为cni0。</p>
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<a class="post-title-link" href="/2023/02/11/kubernetes-container-network/" itemprop="url">容器的网络基础</a></h1>
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<h1 id="容器的网络基础"><a href="#容器的网络基础" class="headerlink" title="容器的网络基础"></a>容器的网络基础</h1><p>容器的网络基础是主机的网络，在理解容器的网络前我们先来看一下主机的网络。</p>
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<p>想象一个场景，你在湖南，你的爱人在湖北，有一天，你们两觉得恋爱的时间差不多了，该结婚了。结婚之前是不是要先见一下家长。但是湖南和湖北之间隔着长江。那你现在要去湖北的话，怎么办呢？你会想，我有车，只需要开车过“长江大桥”去对方父母家就行。</p>
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<p>换一下，现在你有两台电脑，你想让两台电脑能够互相传递文件或者文本信息，那该怎么做呢？我想刚刚的例子中，你会想到，只要建一个桥就行了。那两台电脑直接的桥怎么建？首先你是需要将两台电脑用线”连”起来。正常来说，有了这条传输的线，两台机器之间互相通信的基础条件就具备了。然后再进一步，你家里又买了几台电脑，这几台电脑互相之间也需要通信，那电脑只有一个插口，总不能与谁通信的时候，就插谁的网线吧，这要是都在同一时间通信，那不就的乱了？所以家里一般会有个路由设备，大家都在路由设备插入，然后要发的消息就先发个路由器，路由器再转发。那路由器怎么分清是哪台电脑？所以是不是大家要有个唯一标识符号（mac地址）。你看OSI七层模型就出来了。具体的化大家可以参考一下这个(<a target="_blank" rel="noopener" href="https://www.lifewire.com/layers-of-the-osi-model-illustrated-818017)%EF%BC%8C%E6%88%91%E4%BB%AC%E4%B8%BB%E8%A6%81%E6%98%AF%E8%B0%88%E5%AE%B9%E5%99%A8%E7%BD%91%E7%BB%9C%E3%80%82">https://www.lifewire.com/layers-of-the-osi-model-illustrated-818017)，我们主要是谈容器网络。</a></p>
<p>前面这些铺垫，其实主要还是为了主题容器网络。</p>
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