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<meta property="og:description" content="rabbitmq 介绍接触了一下rabbitmq，原来在选型的时候是在rabbitmq跟kafka之间做选择，网上搜了一下之后发现kafka的优势在于吞吐量，而rabbitmq相对注重可靠性，因为应用在im上，需要保证消息不能丢失所以就暂时选定rabbitmq，Message Queue的需求由来已久，80年代最早在金融交易中，高盛等公司采用Teknekron公司的产品，当时的Message qu">
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<h2 id="rabbitmq-介绍"><a href="#rabbitmq-介绍" class="headerlink" title="rabbitmq 介绍"></a>rabbitmq 介绍</h2><p>接触了一下rabbitmq，原来在选型的时候是在rabbitmq跟kafka之间做选择，网上搜了一下之后发现kafka的优势在于吞吐量，而rabbitmq相对注重可靠性，因为应用在im上，需要保证消息不能丢失所以就暂时选定rabbitmq，<br>Message Queue的需求由来已久，80年代最早在金融交易中，高盛等公司采用Teknekron公司的产品，当时的Message queuing软件叫做：the information bus（TIB）。 TIB被电信和通讯公司采用，路透社收购了Teknekron公司。之后，IBM开发了MQSeries，微软开发了Microsoft Message Queue（MSMQ）。这些商业MQ供应商的问题是厂商锁定，价格高昂。2001年，Java Message queuing试图解决锁定和交互性的问题，但对应用来说反而更加麻烦了。<br>RabbitMQ采用Erlang语言开发。Erlang语言由Ericson设计，专门为开发concurrent和distribution系统的一种语言，在电信领域使用广泛。OTP（Open Telecom Platform）作为Erlang语言的一部分，包含了很多基于Erlang开发的中间件／库／工具，如mnesia／SASL，极大方便了Erlang应用的开发。OTP就类似于Python语言中众多的module，用户借助这些module可以很方便的开发应用。<br>于是2004年，摩根大通和iMatrix开始着手<a href="https://en.wikipedia.org/wiki/Advanced_Message_Queuing_Protocol" target="_blank" rel="noopener">Advanced Message Queuing Protocol （AMQP）</a>开放标准的开发。2006年，AMQP规范发布。2007年，Rabbit技术公司基于AMQP标准开发的RabbitMQ 1.0 发布。所有主要的编程语言均有与代理接口通讯的客户端库。</p>
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<h2 id="简单的使用经验"><a href="#简单的使用经验" class="headerlink" title="简单的使用经验"></a>简单的使用经验</h2><h3 id="通俗的理解"><a href="#通俗的理解" class="headerlink" title="通俗的理解"></a>通俗的理解</h3><p>这里介绍下其中的一些概念，connection表示和队列服务器的连接，一般情况下是tcp连接， channel表示通道，可以在一个连接上建立多个通道，这里主要是节省了tcp连接握手的成本，exchange可以理解成一个路由器，将消息推送给对应的队列queue，其实是像一个订阅的模式。</p>
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<h3 id="集群经验"><a href="#集群经验" class="headerlink" title="集群经验"></a>集群经验</h3><p><code>rabbitmqctl stop</code>这个是关闭rabbitmq，在搭建集群时候先关闭服务，然后使用<code>rabbitmq-server -detached</code>静默启动，这时候使用<code>rabbitmqctl cluster_status</code>查看集群状态，因为还没将节点加入集群，所以只能看到类似</p>
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<figure class="highlight shell"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line">Cluster status of node rabbit@rabbit1 ...</span><br><span class="line">[{nodes,[{disc,[rabbit@rabbit1,rabbit@rabbit2,rabbit@rabbit3]}]},</span><br><span class="line"> {running_nodes,[rabbit@rabbit2,rabbit@rabbit1]}]</span><br><span class="line">...done.</span><br></pre></td></tr></table></figure>
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<p>然后就可以把当前节点加入集群，</p>
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<figure class="highlight shell"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">rabbit2$</span><span class="bash"> rabbitmqctl stop_app <span class="comment">#这个stop_app与stop的区别是前者停的是rabbitmq应用，保留erlang节点，</span></span></span><br><span class="line"> #后者是停止了rabbitmq和erlang节点</span><br><span class="line">Stopping node rabbit@rabbit2 ...done.</span><br><span class="line"><span class="meta">rabbit2$</span><span class="bash"> rabbitmqctl join_cluster rabbit@rabbit1 <span class="comment">#这里可以用--ram指定将当前节点作为内存节点加入集群</span></span></span><br><span class="line">Clustering node rabbit@rabbit2 with [rabbit@rabbit1] ...done.</span><br><span class="line"><span class="meta">rabbit2$</span><span class="bash"> rabbitmqctl start_app</span></span><br><span class="line">Starting node rabbit@rabbit2 ...done.</span><br></pre></td></tr></table></figure>
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<p>其他可以参考<a href="http://www.rabbitmq.com/clustering.html" target="_blank" rel="noopener">官方文档</a></p>
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