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<time title="创建时间：2021-06-08 22:43:12 / 修改时间：22:45:10" itemprop="dateCreated datePublished" datetime="2021-06-08T22:43:12+08:00">2021-06-08</time>
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<h3 id="概念"><a href="#概念" class="headerlink" title="概念"></a>概念</h3><p>ELK是ElasticSearch、Logstash、kibana的组合。logstash部署在要收集日志的主机上，作为一个logagent，它将数据收集、处理、输出到es中，然后我们通过kibana可以将es的数据显示出来。</p>
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<h3 id="流量处理过程"><a href="#流量处理过程" class="headerlink" title="流量处理过程"></a>流量处理过程</h3><p><img src="/2021/06/08/Envoy-4-%E6%B5%81%E9%87%8F%E7%AE%A1%E7%90%86/%E6%B5%81%E5%85%A5%E8%BF%87%E7%A8%8B.png" alt="流入过程"></p>
<h3 id="连接管理"><a href="#连接管理" class="headerlink" title="连接管理"></a>连接管理</h3><p>Envoy通过内置的L4过滤器HTTP连接管理器将原始字节转换为HTTP应用层协议级别的消息和事件，例如接收到的标头和主体等，以及处理所有HTTP连接和请求共有的功能，包括访问日志、生成和跟踪请求ID， 请求/响应头处理、路由表管理和统计信息等；</p>
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<h3 id="集群管理器"><a href="#集群管理器" class="headerlink" title="集群管理器"></a>集群管理器</h3><p>Envoy支持同时配置任意数量的上游集群，并基于集群管理器（Cluster Manager）管理它们；Cluster Manager负责为集群管理上游主机的健康状态、负载均衡机制、连接类型及适用协议等，生成集群配置的方式由静态或动态（CDS）两种；</p>
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<h3 id="概述"><a href="#概述" class="headerlink" title="概述"></a>概述</h3><p>Envoy支持基于文件系统或通过查询一到多个管理服务器（Management Server） 来发现各种动态资源（配置信息），这些发现服务及其相应的API联合起来称为 xDS API。</p>
<p>Envoy可动态配置部分包括LDS、CDS、RDS、EDS、SDS、 HDS(Health Discovery Service)、RLS(Rate Limit Service)和MS（Metric Service）等；</p>
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<h3 id="微服务如何治理"><a href="#微服务如何治理" class="headerlink" title="微服务如何治理"></a>微服务如何治理</h3><p>服务治理就是对服务不断增长的复杂度的管控及管理，这里主要涉及到k8s和service mesh。</p>
<p>Kubernetes提供了强大的应用部署、升级和弹性伸缩等管理机制，并借助于Service 等实现了服务注册、发现以及负载均衡；它本质是应用的生命周期管理，为服务提供了可扩展、高弹性的部署和管理平台。</p>
<p>Service mesh（服务网格）提供应用间的流量管理，拦截微服务间的流量交由其控制平面来决定是否做额外的操作，它将流量控制从k8s中解耦。</p>
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<p>由于目前正式进入工作状态，且马上到3个月转正，因此耽搁许久的博客需要维护起来，后续的学习计划也需要安排一下。</p>
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