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<article class="page" itemscope itemtype="http://schema.org/CreativeWork">
<meta itemprop="headline" content="服务治理">
<meta itemprop="description" content="介绍如何在体质指数应用中使用ServiceComb提供的服务治理能力">
<meta itemprop="dateModified" content="August 08, 2019">
<div class="page__inner-wrap">
<header>
<h1 class="page__title" itemprop="headline">服务治理
</h1>
</header>
<section class="page__content" itemprop="text">
<ul>
<li>服务治理主要用于对分布式系统中大量微服务进行有效控制管理。本指南将会展示如何使用 <strong>mesher</strong> 提供的服务治理能力。</li>
</ul>
<h1 id="前言">前言</h1>
<ul>
<li>在您进一步阅读之前,请确保您已阅读了<a href="/cn/docs/products/mesher/quick-start/">mesher快速入门</a><a href="/cn/docs/products/mesher/load-balance/">mesher负载均衡</a>,并已成功运行mesher用例服务。</li>
</ul>
<h1 id="灰度发布">灰度发布</h1>
<h2 id="配置">配置</h2>
<ul>
<li>
<p>1、更新版本号: 分别更改两个<strong>mesher_calculator</strong>实例的配置文件<strong>microservice.yaml</strong>,更新<strong>version</strong>字段分别为<strong>1.1.1</strong><strong>1.1.2</strong>,重启mesher服务,可以看到服务版本号发生了变更。如图中所示:</p>
<p><img src="/assets/images/mesher/mesher-ser-manage-ver.png" alt="灰度发布版本图" /></p>
</li>
<li>
<p>2、配置路由信息,更改mesher_webapp的配置文件router.yaml,按实例版本更新权重信息,并重启服务:</p>
<div class="language-yaml highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="na">routeRule</span><span class="pi">:</span>
<span class="na">calculator</span><span class="pi">:</span> <span class="c1">#service name</span>
<span class="pi">-</span> <span class="na">precedence</span><span class="pi">:</span> <span class="m">2</span> <span class="c1">#precedence of route rule</span>
<span class="na">route</span><span class="pi">:</span> <span class="c1">#route rule list</span>
<span class="pi">-</span> <span class="na">tags</span><span class="pi">:</span>
<span class="na">version</span><span class="pi">:</span> <span class="s">1.1.1</span>
<span class="na">weight</span><span class="pi">:</span> <span class="m">70</span> <span class="c1">#weight of 20%</span>
<span class="pi">-</span> <span class="na">tags</span><span class="pi">:</span>
<span class="na">version</span><span class="pi">:</span> <span class="s">1.1.2</span>
<span class="na">weight</span><span class="pi">:</span> <span class="m">30</span> <span class="c1">#weight of 20%</span>
</code></pre></div> </div>
</li>
</ul>
<h2 id="验证">验证</h2>
<ul>
<li>此时大量点击 <em>Submit</em> 按钮就可以看到BMI Instance ID按配置的比例交替出现。</li>
</ul>
<h1 id="服务熔断及恢复">服务熔断及恢复</h1>
<h2 id="配置-1">配置</h2>
<ul>
<li>
<p>1、 更改断流器配置,更改mesher_webapp的配置文件chassis.yaml,设置其中的断流器配置为:</p>
<div class="language-yaml highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="na">isolation</span><span class="pi">:</span>
<span class="na">Consumer</span><span class="pi">:</span>
<span class="na">timeout</span><span class="pi">:</span>
<span class="na">enabled</span><span class="pi">:</span> <span class="no">true</span>
<span class="na">timeoutInMilliseconds</span><span class="pi">:</span> <span class="m">1000</span> <span class="c1">#超时时间</span>
<span class="na">maxConcurrentRequests</span><span class="pi">:</span> <span class="m">1</span>
<span class="na">circuitBreaker</span><span class="pi">:</span>
<span class="na">Consumer</span><span class="pi">:</span>
<span class="na">enabled</span><span class="pi">:</span> <span class="no">true</span>
<span class="na">forceOpen</span><span class="pi">:</span> <span class="no">false</span>
<span class="na">forceClosed</span><span class="pi">:</span> <span class="no">false</span>
<span class="na">sleepWindowInMilliseconds</span><span class="pi">:</span> <span class="m">10000</span> <span class="c1">#熔断恢复时间10秒</span>
<span class="na">requestVolumeThreshold</span><span class="pi">:</span> <span class="m">1</span> <span class="c1">#请求量限制</span>
<span class="na">errorThresholdPercentage</span><span class="pi">:</span> <span class="m">1</span>
<span class="na">fallback</span><span class="pi">:</span>
<span class="na">Consumer</span><span class="pi">:</span>
<span class="na">enabled</span><span class="pi">:</span> <span class="no">true</span>
<span class="na">maxConcurrentRequests</span><span class="pi">:</span> <span class="m">1</span>
<span class="na">fallbackpolicy</span><span class="pi">:</span>
<span class="na">Consumer</span><span class="pi">:</span>
<span class="na">policy</span><span class="pi">:</span> <span class="s">returnnull</span>
</code></pre></div> </div>
</li>
<li>
<p>2、 关闭test_balance目录下的服务实例;</p>
</li>
</ul>
<h2 id="验证-1">验证</h2>
<ul>
<li>
<p>1、传入负数参数,响应超时,mesher_webapp断流器生效,下图一是mesher_webapp日志截图,表明断流器启用,下图二是传入负数参数触发断流器时的返回值,下图三表示断流器生效后对所有请求都按配置返回nil;</p>
<p><img src="/assets/images/mesher/mesher-circuitbreaker.png" alt="断流器生效日志图" /></p>
<p><img src="/assets/images/mesher/mesher-circuitbreaker-ret.png" alt="断流器生效日志图" /></p>
<p><img src="/assets/images/mesher/mesher-circuitbreaker-ret-nil.png" alt="断流器生效日志图" /></p>
</li>
<li>
<p>2、根据配置参数sleepWindowInMilliseconds,过10秒后服务自动恢复</p>
</li>
</ul>
<h1 id="下一步">下一步</h1>
<ul>
<li>
<p>阅读<a href="/cn/docs/products/mesher/distributed-tracing/">分布式追踪快速入门指南</a></p>
</li>
<li>
<p>了解更多<a href="/cn/docs/users/service-configurations/">服务治理</a>的使用方式</p>
</li>
</ul>
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