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<!DOCTYPE HTML>
<html lang="zh-CN">
<head><meta name="generator" content="Hexo 3.9.0">
<meta charset="utf-8">
<meta name="keywords" content="Nacos, 记录">
<meta name="baidu-site-verification" content="fmlEuI34ir">
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<meta name="360-site-verification" content="b7c11a830ef90fd1464ad6206bb7b6e7">
<meta name="description" content="Nacos注册中心认识和安装NacosNacos是阿里巴巴的产品，现在是SpringCloud中的一个组件。相比Eureka功能更加丰富，在国内受欢迎程度较高。
安装NacosGitHub主页：https://github.com/ali">
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<title>Nacos | Ji`s Blog</title>
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</script></head>
<div id="loading-container">
<p class="loading-text"></p>
<div class="loading-image">
<div></div>
<div></div>
<div></div>
<div></div>
<div></div>
</div>
</div><body>
<header class="navbar-fixed">
<nav id="headNav" class="bg-color nav-transparent">
<div id="navContainer" class="nav-wrapper container">
<div class="brand-logo">
<a href="/" class="waves-effect waves-light">
<img src="/medias/logo.png" class="logo-img" alt="LOGO">
<span class="logo-span">Ji`s Blog</span>
</a>
</div>
<a href="#" data-target="mobile-nav" class="sidenav-trigger button-collapse"><i class="fa fa-navicon"></i></a>
<ul class="right">
<li class="hide-on-med-and-down">
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<span>首页</span>
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<li class="hide-on-med-and-down">
<a href="/tags" class="waves-effect waves-light">
<span>标签</span>
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<span>归档</span>
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<span>关于</span>
</a>
</li>
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<span>友情链接</span>
</a>
</li>
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<span>留言板</span>
</a>
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<i id="searchIcon" class="fa fa-search" title="搜索"></i>
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<h1 id="Nacos注册中心"><a href="#Nacos注册中心" class="headerlink" title="Nacos注册中心"></a>Nacos注册中心</h1><h2 id="认识和安装Nacos"><a href="#认识和安装Nacos" class="headerlink" title="认识和安装Nacos"></a>认识和安装Nacos</h2><p><a href="https://nacos.io/" target="_blank" rel="noopener">Nacos</a>是阿里巴巴的产品，现在是<a href="https://spring.io/projects/spring-cloud" target="_blank" rel="noopener">SpringCloud</a>中的一个组件。相比<a href="https://github.com/Netflix/eureka" target="_blank" rel="noopener">Eureka</a>功能更加丰富，在国内受欢迎程度较高。</p>
<p><img src="/nacos/image-20210713230444308.png" alt="image-20210713230444308"></p>
<h3 id="安装Nacos"><a href="#安装Nacos" class="headerlink" title="安装Nacos"></a>安装Nacos</h3><p>GitHub主页：<a href="https://github.com/alibaba/nacos" target="_blank" rel="noopener">https://github.com/alibaba/nacos</a></p>
<p>GitHub的Release下载页：<a href="https://github.com/alibaba/nacos/releases" target="_blank" rel="noopener">https://github.com/alibaba/nacos/releases</a></p>
<p>解压</p>
<p><img src="/nacos/image-20210402161843337.png" alt="image-20210402161843337"></p>
<p>目录说明：</p>
<ul>
<li>bin：启动脚本</li>
<li>conf：配置文件</li>
</ul>
<h4 id="端口配置"><a href="#端口配置" class="headerlink" title="端口配置"></a>端口配置</h4><p>Nacos的默认端口是8848，如果电脑上的其它进程占用了8848端口，请先尝试关闭该进程。</p>
<p><strong>如果无法关闭占用8848端口的进程</strong>，也可以进入nacos的conf目录，修改配置文件中的端口：</p>
<p><img src="/nacos/image-20210402162008280.png" alt="image-20210402162008280"></p>
<p>修改其中的内容：</p>
<p><img src="/nacos/image-20210402162251093.png" alt="image-20210402162251093"></p>
<h4 id="启动"><a href="#启动" class="headerlink" title="启动"></a>启动</h4><p>启动非常简单，进入bin目录，结构如下：</p>
<p><img src="/nacos/image-20210402162350977.png" alt="image-20210402162350977"></p>
<p>然后执行命令即可：</p>
<ul>
<li><p>windows命令：</p>
<pre><code>startup.cmd -m standalone</code></pre></li>
</ul>
<p>执行后的效果如图：</p>
<p><img src="/nacos/image-20210402162526774.png" alt="image-20210402162526774"></p>
<h4 id="访问"><a href="#访问" class="headerlink" title="访问"></a>访问</h4><p>在浏览器输入地址：<a href="http://127.0.0.1:8848/nacos即可：" target="_blank" rel="noopener">http://127.0.0.1:8848/nacos即可：</a></p>
<p><img src="/nacos/image-20210402162630427.png" alt="image-20210402162630427"></p>
<p>默认的账号和密码都是nacos，进入后：</p>
<p><img src="/nacos/image-20210402162709515.png" alt="image-20210402162709515"></p>
<p>Linux和Windows差不多</p>
<p>就是下载安装包解压</p>
<p>Nacos依赖于JDK运行所以Linux上也需要安装JDK才行。</p>
<p>tar -xvf nacos-server-1.4.1.tar.gz</p>
<p><img src="/nacos/image-20210402164414827.png" alt="image-20210402164414827"></p>
<p>在nacos/bin目录中，输入命令启动Nacos：</p>
<pre class="line-numbers language-sh"><code class="language-sh">sh startup.sh -m standalone<span aria-hidden="true" class="line-numbers-rows"><span></span></span></code></pre>
<h2 id="Nacos的依赖"><a href="#Nacos的依赖" class="headerlink" title="Nacos的依赖"></a>Nacos的依赖</h2><p>父工程：</p>
<pre class="line-numbers language-xml"><code class="language-xml"><span class="token tag"><span class="token tag"><span class="token punctuation"><</span>dependency</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>groupId</span><span class="token punctuation">></span></span>com.alibaba.cloud<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>groupId</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>artifactId</span><span class="token punctuation">></span></span>spring-cloud-alibaba-dependencies<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>artifactId</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>version</span><span class="token punctuation">></span></span>2.2.5.RELEASE<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>version</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>type</span><span class="token punctuation">></span></span>pom<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>type</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>scope</span><span class="token punctuation">></span></span>import<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>scope</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>dependency</span><span class="token punctuation">></span></span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
<p>客户端：</p>
<pre class="line-numbers language-xml"><code class="language-xml"><span class="token comment" spellcheck="true"><!-- nacos客户端依赖包 --></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>dependency</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>groupId</span><span class="token punctuation">></span></span>com.alibaba.cloud<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>groupId</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>artifactId</span><span class="token punctuation">></span></span>spring-cloud-starter-alibaba-nacos-discovery<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>artifactId</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>dependency</span><span class="token punctuation">></span></span>
<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span></span></code></pre>
<h2 id="服务注册到nacos"><a href="#服务注册到nacos" class="headerlink" title="服务注册到nacos"></a>服务注册到nacos</h2><p>Nacos是SpringCloudAlibaba的组件，而SpringCloudAlibaba也遵循SpringCloud中定义的服务注册、服务发现规范。因此使用Nacos和使用Eureka对于微服务来说，并没有太大区别。</p>
<p>主要差异在于：</p>
<ul>
<li>依赖不同</li>
<li>服务地址不同</li>
</ul>
<h3 id="引入依赖"><a href="#引入依赖" class="headerlink" title="引入依赖"></a>引入依赖</h3><p>在cloud-demo父工程的pom文件中的<code><dependencyManagement></code>中引入SpringCloudAlibaba的依赖：</p>
<pre class="line-numbers language-xml"><code class="language-xml"><span class="token tag"><span class="token tag"><span class="token punctuation"><</span>dependency</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>groupId</span><span class="token punctuation">></span></span>com.alibaba.cloud<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>groupId</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>artifactId</span><span class="token punctuation">></span></span>spring-cloud-alibaba-dependencies<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>artifactId</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>version</span><span class="token punctuation">></span></span>2.2.6.RELEASE<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>version</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>type</span><span class="token punctuation">></span></span>pom<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>type</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>scope</span><span class="token punctuation">></span></span>import<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>scope</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>dependency</span><span class="token punctuation">></span></span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
<p>然后在user-service和order-service中的pom文件中引入nacos-discovery依赖：</p>
<pre class="line-numbers language-xml"><code class="language-xml"><span class="token tag"><span class="token tag"><span class="token punctuation"><</span>dependency</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>groupId</span><span class="token punctuation">></span></span>com.alibaba.cloud<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>groupId</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>artifactId</span><span class="token punctuation">></span></span>spring-cloud-starter-alibaba-nacos-discovery<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>artifactId</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>dependency</span><span class="token punctuation">></span></span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span></span></code></pre>
<p><strong>注意</strong>：不要忘了注释掉eureka的依赖。</p>
<h3 id="配置nacos地址"><a href="#配置nacos地址" class="headerlink" title="配置nacos地址"></a>配置nacos地址</h3><p>在user-service和order-service的application.yml中添加nacos地址：</p>
<pre class="line-numbers language-yaml"><code class="language-yaml"><span class="token key atrule">spring</span><span class="token punctuation">:</span>
<span class="token key atrule">cloud</span><span class="token punctuation">:</span>
<span class="token key atrule">nacos</span><span class="token punctuation">:</span>
<span class="token key atrule">server-addr</span><span class="token punctuation">:</span> localhost<span class="token punctuation">:</span><span class="token number">8848</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span></span></code></pre>
<blockquote>
<p><strong>注意</strong>：不要忘了注释掉eureka的地址</p>
</blockquote>
<h3 id="重启"><a href="#重启" class="headerlink" title="重启"></a>重启</h3><p>重启微服务后，登录nacos管理页面，可以看到微服务信息：</p>
<p><img src="/nacos/image-20210713231439607.png" alt="image-20210713231439607"></p>
<h2 id="服务分级存储模型"><a href="#服务分级存储模型" class="headerlink" title="服务分级存储模型"></a>服务分级存储模型</h2><p>一个<strong>服务</strong>可以有多个<strong>实例</strong>，例如我们的user-service，可以有:</p>
<ul>
<li>127.0.0.1:8081</li>
<li>127.0.0.1:8082</li>
<li>127.0.0.1:8083</li>
</ul>
<p>假如这些实例分布于全国各地的不同机房，例如：</p>
<ul>
<li>127.0.0.1:8081，在上海机房</li>
<li>127.0.0.1:8082，在上海机房</li>
<li>127.0.0.1:8083，在杭州机房</li>
</ul>
<p>Nacos就将同一机房内的实例 划分为一个<strong>集群</strong>。</p>
<p>也就是说，user-service是服务，一个服务可以包含多个集群，如杭州、上海，每个集群下可以有多个实例，形成分级模型，如图：</p>
<p><img src="/nacos/image-20210713232522531.png" alt="image-20210713232522531"></p>
<p>微服务互相访问时，应该尽可能访问同集群实例，因为本地访问速度更快。当本集群内不可用时，才访问其它集群。例如：</p>
<p><img src="/nacos/image-20210713232658928.png" alt="image-20210713232658928"></p>
<p>杭州机房内的order-service应该优先访问同机房的user-service。</p>
<h3 id="5-3-1-给user-service配置集群"><a href="#5-3-1-给user-service配置集群" class="headerlink" title="5.3.1.给user-service配置集群"></a>5.3.1.给user-service配置集群</h3><p>修改user-service的application.yml文件，添加集群配置：</p>
<pre class="line-numbers language-yaml"><code class="language-yaml"><span class="token key atrule">spring</span><span class="token punctuation">:</span>
<span class="token key atrule">cloud</span><span class="token punctuation">:</span>
<span class="token key atrule">nacos</span><span class="token punctuation">:</span>
<span class="token key atrule">server-addr</span><span class="token punctuation">:</span> localhost<span class="token punctuation">:</span><span class="token number">8848</span>
<span class="token key atrule">discovery</span><span class="token punctuation">:</span>
<span class="token key atrule">cluster-name</span><span class="token punctuation">:</span> HZ <span class="token comment" spellcheck="true"># 集群名称</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
<p>重启两个user-service实例后，我们可以在nacos控制台看到下面结果：</p>
<p><img src="/nacos/image-20210713232916215.png" alt="image-20210713232916215"></p>
<p>我们再次复制一个user-service启动配置，添加属性：</p>
<pre class="line-numbers language-sh"><code class="language-sh">-Dserver.port=8083 -Dspring.cloud.nacos.discovery.cluster-name=SH<span aria-hidden="true" class="line-numbers-rows"><span></span></span></code></pre>
<p>配置如图所示：</p>
<p><img src="/nacos/image-20210713233528982.png" alt="image-20210713233528982"></p>
<p>启动UserApplication3后再次查看nacos控制台：</p>
<p><img src="/nacos/image-20210713233727923.png" alt="image-20210713233727923"></p>
<h3 id="同集群优先的负载均衡"><a href="#同集群优先的负载均衡" class="headerlink" title="同集群优先的负载均衡"></a>同集群优先的负载均衡</h3><p>默认的<code>ZoneAvoidanceRule</code>并不能实现根据同集群优先来实现负载均衡。</p>
<p>因此Nacos中提供了一个<code>NacosRule</code>的实现，可以优先从同集群中挑选实例。</p>
<p>1）给order-service配置集群信息</p>
<p>修改order-service的application.yml文件，添加集群配置：</p>
<pre class="line-numbers language-sh"><code class="language-sh">spring:
cloud:
nacos:
server-addr: localhost:8848
discovery:
cluster-name: HZ # 集群名称<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
<p>2）修改负载均衡规则</p>
<p>修改order-service的application.yml文件，修改负载均衡规则：</p>
<pre class="line-numbers language-yaml"><code class="language-yaml"><span class="token key atrule">userservice</span><span class="token punctuation">:</span>
<span class="token key atrule">ribbon</span><span class="token punctuation">:</span>
<span class="token key atrule">NFLoadBalancerRuleClassName</span><span class="token punctuation">:</span> com.alibaba.cloud.nacos.ribbon.NacosRule <span class="token comment" spellcheck="true"># 负载均衡规则 </span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span></span></code></pre>
<h2 id="权重配置"><a href="#权重配置" class="headerlink" title="权重配置"></a>权重配置</h2><p>实际部署中会出现这样的场景：</p>
<p>服务器设备性能有差异，部分实例所在机器性能较好，另一些较差，我们希望性能好的机器承担更多的用户请求。</p>
<p>但默认情况下NacosRule是同集群内随机挑选，不会考虑机器的性能问题。</p>
<p>因此，Nacos提供了权重配置来控制访问频率，权重越大则访问频率越高。</p>
<p>在nacos控制台，找到user-service的实例列表，点击编辑，即可修改权重：</p>
<p><img src="/nacos/image-20210713235133225.png" alt="image-20210713235133225"></p>
<p>在弹出的编辑窗口，修改权重：</p>
<p><img src="/nacos/image-20210713235235219.png" alt="image-20210713235235219"></p>
<blockquote>
<p><strong>注意</strong>：如果权重修改为0，则该实例永远不会被访问</p>
</blockquote>
<h2 id="环境隔离"><a href="#环境隔离" class="headerlink" title="环境隔离"></a>环境隔离</h2><p>Nacos提供了namespace来实现环境隔离功能。</p>
<ul>
<li>nacos中可以有多个namespace</li>
<li>namespace下可以有group、service等</li>
<li>不同namespace之间相互隔离，例如不同namespace的服务互相不可见</li>
</ul>
<p><img src="/nacos/image-20210714000101516.png" alt="image-20210714000101516"></p>
<h3 id="5-5-1-创建namespace"><a href="#5-5-1-创建namespace" class="headerlink" title="5.5.1.创建namespace"></a>5.5.1.创建namespace</h3><p>默认情况下，所有service、data、group都在同一个namespace，名为public：</p>
<p><img src="/nacos/image-20210714000414781.png" alt="image-20210714000414781"></p>
<p>我们可以点击页面新增按钮，添加一个namespace：</p>
<p><img src="/nacos/image-20210714000440143.png" alt="image-20210714000440143"></p>
<p>然后，填写表单：</p>
<p><img src="/nacos/image-20210714000505928.png" alt="image-20210714000505928"></p>
<p>就能在页面看到一个新的namespace：</p>
<p><img src="/nacos/image-20210714000522913.png" alt="image-20210714000522913"></p>
<h3 id="给微服务配置namespace"><a href="#给微服务配置namespace" class="headerlink" title="给微服务配置namespace"></a>给微服务配置namespace</h3><p>给微服务配置namespace只能通过修改配置来实现。</p>
<p>例如，修改order-service的application.yml文件：</p>
<pre class="line-numbers language-yaml"><code class="language-yaml"><span class="token key atrule">spring</span><span class="token punctuation">:</span>
<span class="token key atrule">cloud</span><span class="token punctuation">:</span>
<span class="token key atrule">nacos</span><span class="token punctuation">:</span>
<span class="token key atrule">server-addr</span><span class="token punctuation">:</span> localhost<span class="token punctuation">:</span><span class="token number">8848</span>
<span class="token key atrule">discovery</span><span class="token punctuation">:</span>
<span class="token key atrule">cluster-name</span><span class="token punctuation">:</span> HZ
<span class="token key atrule">namespace</span><span class="token punctuation">:</span> 492a7d5d<span class="token punctuation">-</span>237b<span class="token punctuation">-</span>46a1<span class="token punctuation">-</span>a99a<span class="token punctuation">-</span>fa8e98e4b0f9 <span class="token comment" spellcheck="true"># 命名空间，填ID</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
<p>重启order-service后，访问控制台，可以看到下面的结果：</p>
<p><img src="/nacos/image-20210714000830703.png" alt="image-20210714000830703"></p>
<p><img src="/nacos/image-20210714000837140.png" alt="image-20210714000837140"></p>
<p>此时访问order-service，因为namespace不同，会导致找不到userservice，控制台会报错：</p>
<p><img src="/nacos/image-20210714000941256.png" alt="image-20210714000941256"></p>
<h2 id="Nacos与Eureka的区别"><a href="#Nacos与Eureka的区别" class="headerlink" title="Nacos与Eureka的区别"></a>Nacos与Eureka的区别</h2><p>Nacos的服务实例分为两种l类型：</p>
<ul>
<li><p>临时实例：如果实例宕机超过一定时间，会从服务列表剔除，默认的类型。</p>
</li>
<li><p>非临时实例：如果实例宕机，不会从服务列表剔除，也可以叫永久实例。</p>
</li>
</ul>
<p>配置一个服务实例为永久实例：</p>
<pre class="line-numbers language-yaml"><code class="language-yaml"><span class="token key atrule">spring</span><span class="token punctuation">:</span>
<span class="token key atrule">cloud</span><span class="token punctuation">:</span>
<span class="token key atrule">nacos</span><span class="token punctuation">:</span>
<span class="token key atrule">discovery</span><span class="token punctuation">:</span>
<span class="token key atrule">ephemeral</span><span class="token punctuation">:</span> <span class="token boolean important">false </span><span class="token comment" spellcheck="true"># 设置为非临时实例</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span></span></code></pre>
<p>Nacos和Eureka整体结构类似，服务注册、服务拉取、心跳等待，但是也存在一些差异：</p>
<p><img src="/nacos/image-20210714001728017.png" alt="image-20210714001728017"></p>
<ul>
<li><p>Nacos与eureka的共同点</p>
<ul>
<li>都支持服务注册和服务拉取</li>
<li>都支持服务提供者心跳方式做健康检测</li>
</ul>
</li>
<li><p>Nacos与Eureka的区别</p>
<ul>
<li>Nacos支持服务端主动检测提供者状态：临时实例采用心跳模式，非临时实例采用主动检测模式</li>
<li>临时实例心跳不正常会被剔除，非临时实例则不会被剔除</li>
<li>Nacos支持服务列表变更的消息推送模式，服务列表更新更及时</li>
<li>Nacos集群默认采用AP方式，当集群中存在非临时实例时，采用CP模式；Eureka采用AP方式</li>
</ul>
</li>
</ul>
<h2 id="Nacos的服务注册表结构"><a href="#Nacos的服务注册表结构" class="headerlink" title="Nacos的服务注册表结构"></a>Nacos的服务注册表结构</h2><p>Nacos采用了数据的分级存储模型，最外层是Namespace，用来隔离环境。然后是Group，用来对服务分组。接下来就是服务（Service）了，一个服务包含多个实例，但是可能处于不同机房，因此Service下有多个集群（Cluster），Cluster下是不同的实例（Instance）。</p>
<p>对应到Java代码中，Nacos采用了一个多层的Map来表示。结构为Map<String, Map<String, Service>>，其中最外层Map的key就是namespaceId，值是一个Map。内层Map的key是group拼接serviceName，值是Service对象。Service对象内部又是一个Map，key是集群名称，值是Cluster对象。而Cluster对象内部维护了Instance的集合。</p>
<p><img src="/nacos/image-20210925215305446.png" alt="image-20210925215305446"></p>