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<title>3. Service Discovery with Consul</title><link rel="stylesheet" type="text/css" href="css/manual-multipage.css"><meta name="generator" content="DocBook XSL Stylesheets V1.78.1"><link rel="home" href="multi_spring-cloud-consul.html" title="Spring Cloud Consul"><link rel="up" href="multi_spring-cloud-consul.html" title="Spring Cloud Consul"><link rel="prev" href="multi_spring-cloud-consul-agent.html" title="2. Consul Agent"><link rel="next" href="multi_spring-cloud-consul-config.html" title="4. Distributed Configuration with Consul"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">3. Service Discovery with Consul</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="multi_spring-cloud-consul-agent.html">Prev</a> </td><th width="60%" align="center"> </th><td width="20%" align="right"> <a accesskey="n" href="multi_spring-cloud-consul-config.html">Next</a></td></tr></table><hr></div><div class="chapter"><div class="titlepage"><div><div><h1 class="title"><a name="spring-cloud-consul-discovery" href="#spring-cloud-consul-discovery"></a>3. Service Discovery with Consul</h1></div></div></div><p>Service Discovery is one of the key tenets of a microservice based architecture. Trying to hand configure each client or some form of convention can be very difficult to do and can be very brittle. Consul provides Service Discovery services via an <a class="link" href="https://www.consul.io/docs/agent/http.html" target="_top">HTTP API</a> and <a class="link" href="https://www.consul.io/docs/agent/dns.html" target="_top">DNS</a>. Spring Cloud Consul leverages the HTTP API for service registration and discovery. This does not prevent non-Spring Cloud applications from leveraging the DNS interface. Consul Agents servers are run in a <a class="link" href="https://www.consul.io/docs/internals/architecture.html" target="_top">cluster</a> that communicates via a <a class="link" href="https://www.consul.io/docs/internals/gossip.html" target="_top">gossip protocol</a> and uses the <a class="link" href="https://www.consul.io/docs/internals/consensus.html" target="_top">Raft consensus protocol</a>.</p><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="_how_to_activate" href="#_how_to_activate"></a>3.1 How to activate</h2></div></div></div><p>To activate Consul Service Discovery use the starter with group <code class="literal">org.springframework.cloud</code> and artifact id <code class="literal">spring-cloud-starter-consul-discovery</code>. See the <a class="link" href="http://projects.spring.io/spring-cloud/" target="_top">Spring Cloud Project page</a> for details on setting up your build system with the current Spring Cloud Release Train.</p></div><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="_registering_with_consul" href="#_registering_with_consul"></a>3.2 Registering with Consul</h2></div></div></div><p>When a client registers with Consul, it provides meta-data about itself such as host and port, id, name and tags. An HTTP <a class="link" href="https://www.consul.io/docs/agent/checks.html" target="_top">Check</a> is created by default that Consul hits the <code class="literal">/health</code> endpoint every 10 seconds. If the health check fails, the service instance is marked as critical.</p><p>Example Consul client:</p><pre class="programlisting"><em><span class="hl-annotation" style="color: gray">@SpringBootApplication</span></em>
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<title>3. Service Discovery with Consul</title><link rel="stylesheet" type="text/css" href="css/manual-multipage.css"><meta name="generator" content="DocBook XSL Stylesheets V1.79.1"><link rel="home" href="multi_spring-cloud-consul.html" title="Spring Cloud Consul"><link rel="up" href="multi_spring-cloud-consul.html" title="Spring Cloud Consul"><link rel="prev" href="multi_spring-cloud-consul-agent.html" title="2. Consul Agent"><link rel="next" href="multi_spring-cloud-consul-config.html" title="4. Distributed Configuration with Consul"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">3. Service Discovery with Consul</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="multi_spring-cloud-consul-agent.html">Prev</a> </td><th width="60%" align="center"> </th><td width="20%" align="right"> <a accesskey="n" href="multi_spring-cloud-consul-config.html">Next</a></td></tr></table><hr></div><div class="chapter"><div class="titlepage"><div><div><h1 class="title"><a name="spring-cloud-consul-discovery" href="#spring-cloud-consul-discovery"></a>3. Service Discovery with Consul</h1></div></div></div><p>Service Discovery is one of the key tenets of a microservice based architecture. Trying to hand configure each client or some form of convention can be very difficult to do and can be very brittle. Consul provides Service Discovery services via an <a class="link" href="https://www.consul.io/docs/agent/http.html" target="_top">HTTP API</a> and <a class="link" href="https://www.consul.io/docs/agent/dns.html" target="_top">DNS</a>. Spring Cloud Consul leverages the HTTP API for service registration and discovery. This does not prevent non-Spring Cloud applications from leveraging the DNS interface. Consul Agents servers are run in a <a class="link" href="https://www.consul.io/docs/internals/architecture.html" target="_top">cluster</a> that communicates via a <a class="link" href="https://www.consul.io/docs/internals/gossip.html" target="_top">gossip protocol</a> and uses the <a class="link" href="https://www.consul.io/docs/internals/consensus.html" target="_top">Raft consensus protocol</a>.</p><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="_how_to_activate" href="#_how_to_activate"></a>3.1 How to activate</h2></div></div></div><p>To activate Consul Service Discovery use the starter with group <code class="literal">org.springframework.cloud</code> and artifact id <code class="literal">spring-cloud-starter-consul-discovery</code>. See the <a class="link" href="http://projects.spring.io/spring-cloud/" target="_top">Spring Cloud Project page</a> for details on setting up your build system with the current Spring Cloud Release Train.</p></div><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="_registering_with_consul" href="#_registering_with_consul"></a>3.2 Registering with Consul</h2></div></div></div><p>When a client registers with Consul, it provides meta-data about itself such as host and port, id, name and tags. An HTTP <a class="link" href="https://www.consul.io/docs/agent/checks.html" target="_top">Check</a> is created by default that Consul hits the <code class="literal">/health</code> endpoint every 10 seconds. If the health check fails, the service instance is marked as critical.</p><p>Example Consul client:</p><pre class="programlisting"><em><span class="hl-annotation" style="color: gray">@SpringBootApplication</span></em>
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<em><span class="hl-annotation" style="color: gray">@RestController</span></em>
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<span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">public</span> <span xmlns:d="http://docbook.org/ns/docbook" class="hl-keyword">class</span> Application {
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