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| <article class="page" itemscope itemtype="http://schema.org/CreativeWork"> |
| <meta itemprop="headline" content="Load Balance"> |
| <meta itemprop="description" content="Describe how to use the load balancing capabilities provided by mesher"> |
| |
| <meta itemprop="dateModified" content="August 08, 2019"> |
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| <div class="page__inner-wrap"> |
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| <header> |
| <h1 class="page__title" itemprop="headline">Load Balance |
| </h1> |
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| </header> |
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| <section class="page__content" itemprop="text"> |
| <ul> |
| <li>mesher supports flexible load balancing algorithms. This guide will show you how to use the load balancing capabilities provided by <strong>mesher</strong>.</li> |
| </ul> |
| |
| <h1 id="foreword">Foreword</h1> |
| |
| <ul> |
| <li>Walk through <a href="/docs/products/mesher/quick-start/">mesher-quick-start</a> and have <strong>mesher display programs</strong> running.</li> |
| </ul> |
| |
| <h1 id="enable">Enable</h1> |
| |
| <ul> |
| <li> |
| <p>You can start a new <strong>mesher_calculator</strong> and <strong>httpserver_calculator</strong> instance for load balancing testing by using the program in example directory <a href="https://github.com/apache/servicecomb-mesher/tree/master/examples/quick_start/test_balance">test_balance</a></p> |
| </li> |
| <li> |
| <p>1 Change the <strong>service name</strong> in file <strong>microservice.yaml</strong> to <strong>calculator</strong>. Change the listening address and port in file <strong>chassis.yaml</strong> to avoid conflicts.</p> |
| |
| <div class="language-bash highlighter-rouge"><div class="highlight"><pre class="highlight"><code>listenAddress: 127.0.0.1:40101 <span class="nt">-----</span>》 listenAddress: 192.168.88.64:40102 |
| listenAddress: 127.0.0.1:30101 <span class="nt">-----</span>》 listenAddress: 192.168.88.64:30108 |
| listenAddress: 127.0.0.1:30102 <span class="nt">-----</span>》 listenAddress: 192.168.88.64:30109 |
| </code></pre></div> </div> |
| </li> |
| <li> |
| <p>2 Start running mesher_calculator by cmd:</p> |
| |
| <div class="language-bash highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="nb">export </span><span class="nv">SPECIFIC_ADDR</span><span class="o">=</span>127.0.0.1:4537 |
| ./mesher |
| </code></pre></div> </div> |
| </li> |
| <li> |
| <p>3 The <strong>Roundbin</strong> load balancing algorithm is used by default and the Random, SessionStickiness load balancing algorithms are also supported. We configure the load balancing method <strong>Random</strong> by modifing configuration file chassis.yaml of <strong>mesher_webapp</strong>.</p> |
| |
| <div class="language-yaml highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="na">loadbalance</span><span class="pi">:</span> |
| <span class="na">strategy</span><span class="pi">:</span> |
| <span class="na">name</span><span class="pi">:</span> <span class="s">Random</span> |
| </code></pre></div> </div> |
| </li> |
| <li> |
| <p>4 Run a new services instance of <strong>httpserver_calculator</strong> which is listenning on port 4537.</p> |
| </li> |
| </ul> |
| |
| <h1 id="verification">Verification</h1> |
| |
| <ul> |
| <li> |
| <p>Multiple clicks the <em>Submit</em> button and we can see that the BMI Instance ID in the following two interfaces appear randomly.</p> |
| |
| <p><img src="/assets/images/mesher/mesher-testpythonhttp.png" alt="mesher-test-httppy1" /><br /></p> |
| |
| <p><img src="/assets/images/mesher/mesher-testpythonhttp2.png" alt="mesher-test-httppy2" /></p> |
| </li> |
| </ul> |
| |
| <h2 id="whats-next">What’s next</h2> |
| |
| <ul> |
| <li> |
| <p>See quick start for <a href="/docs/products/mesher/flow-control/">Flow Control</a></p> |
| </li> |
| <li> |
| <p>Learn more about <a href="/docs/users/service-configurations/#load-balancing-policy">Load Balance</a></p> |
| </li> |
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