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| <li><a href="#registration-and-discovery-process" id="markdown-toc-registration-and-discovery-process">Registration and discovery process</a></li> |
| <li><a href="#first-used-of-registration-and-discovery" id="markdown-toc-first-used-of-registration-and-discovery">First used of registration and discovery</a></li> |
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| <h2 id="registrationdiscovery">Registration&Discovery</h2> |
| <p>In a microservices architecture, an application consists of a set of services with a single responsibility, and each service is dynamically deployed to a different node. How should we manage the dependencies between this set of services? |
| <img src="/assets/images/docs/service-center/service-center-why.png" alt="1" /> <br /> |
| The service registry has solved this problem. It allows the service of provider to register its information to the service-center; the service of consumer can discover the provider information from the service-center. |
| The service registry has several advantages:</p> |
| <ul> |
| <li>1 Decouple the provider and the consumer, the service consumer does not need to know the provider address;</li> |
| <li>2 Service dynamic discovery and scalability, dynamic changes of the instance of provider will be pushed to the consumer with the service-center;</li> |
| <li>3 You can monitor the quality of service operations and service dependencies dynamically, and provide governance capabilities for services.</li> |
| </ul> |
| |
| <h2 id="registration-and-discovery-process">Registration and discovery process</h2> |
| <p><img src="/assets/images/docs/service-center/registration&discovery.png" alt="1" /><br /> |
| The service registration and discovery process in Service-Center has the following steps:</p> |
| <ul> |
| <li>1 Registration the provider service to Service-Center.</li> |
| <li>2 The provider sends a heartbeat to maintain the “UP” state in Service-Center.</li> |
| <li>3 Registration the consumer service to Service-Center.</li> |
| <li>4 The Consumer discover the provider information from Service-Center.</li> |
| <li>5 The consumer request the provider and get results.</li> |
| </ul> |
| |
| <p>The Service-Center registration and discovery interface is implemented based on the RESTful standard. It is not restricted by the development language. For the interface definition, please refer to <a href="https://rawcdn.githack.com/ServiceComb/service-center/master/docs/api-docs.html">API Document</a></p> |
| |
| <h2 id="first-used-of-registration-and-discovery">First used of registration and discovery</h2> |
| <p>This chapter is about how to implement the feature of micro-service discovery with ServiceCenter.</p> |
| <ol> |
| <li>Registration the provider service |
| <div class="language-bash highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="nv">$ </span>curl <span class="nt">-X</span> POST <span class="se">\</span> |
| http://127.0.0.1:30100/registry/v3/microservices <span class="se">\</span> |
| <span class="nt">-H</span> <span class="s1">'content-type: application/json'</span> <span class="se">\</span> |
| <span class="nt">-H</span> <span class="s1">'x-domain-name: default'</span> <span class="se">\</span> |
| <span class="nt">-d</span> <span class="s1">'{ |
| "service": |
| { |
| "appId": "default", |
| "serviceName": "ProviderDemoService", |
| "version":"1.0.0" |
| } |
| }'</span> |
| </code></pre></div> </div> |
| <p>And then you can get the ‘ProviderDemoService’ ID like below:</p> |
| <div class="language-bash highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="o">{</span><span class="s2">"serviceId"</span>:<span class="s2">"fa82132706a6b75a13393d8cf48800f9689b2603"</span><span class="o">}</span> |
| </code></pre></div> </div> |
| </li> |
| <li>Registration the provider instance<br /> |
| Mark down the micro-service ID and call the instance registration API, according to the ServiceCenter definition: One process should be registered as one instance. |
| <div class="language-bash highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="nv">$ </span>curl <span class="nt">-X</span> POST <span class="se">\</span> |
| http://127.0.0.1:30100/registry/v3/microservices/fa82132706a6b75a13393d8cf48800f9689b2603/instances <span class="se">\</span> |
| <span class="nt">-H</span> <span class="s1">'content-type: application/json'</span> <span class="se">\</span> |
| <span class="nt">-H</span> <span class="s1">'x-domain-name: default'</span> <span class="se">\</span> |
| <span class="nt">-d</span> <span class="s1">'{ |
| "instance": |
| { |
| "hostName":"provider-demo", |
| "endpoints": [ |
| "rest://127.0.0.1:8080" |
| ] |
| } |
| }'</span> |
| </code></pre></div> </div> |
| <p>The successful response like below:</p> |
| <div class="language-bash highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="o">{</span><span class="s2">"instanceId"</span>:<span class="s2">"6e160fb0196e11e9b8b50242ac110005"</span><span class="o">}</span> |
| </code></pre></div> </div> |
| </li> |
| <li>Registration the consumer service |
| <div class="language-bash highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="nv">$ </span>curl <span class="nt">-X</span> POST <span class="se">\</span> |
| http://127.0.0.1:30100/registry/v3/microservices <span class="se">\</span> |
| <span class="nt">-H</span> <span class="s1">'content-type: application/json'</span> <span class="se">\</span> |
| <span class="nt">-H</span> <span class="s1">'x-domain-name: default'</span> <span class="se">\</span> |
| <span class="nt">-d</span> <span class="s1">'{ |
| "service": |
| { |
| "appId": "default", |
| "serviceName": "ConsumerDemoService", |
| "version":"1.0.0" |
| } |
| }'</span> |
| </code></pre></div> </div> |
| <p>if all are successful, it means you have completed the micro-service registration and instance publish</p> |
| <div class="language-bash highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="o">{</span><span class="s2">"serviceId"</span>:<span class="s2">"d08d29edbeaa372c5be88407aa9adb00b4cb6099"</span><span class="o">}</span> |
| </code></pre></div> </div> |
| </li> |
| <li>Discovery the provider<br /> |
| The next step is that discovery the micro-service instance by service name and version rule |
| <div class="language-bash highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="nv">$ </span>curl <span class="nt">-X</span> GET <span class="se">\</span> |
| <span class="s1">'http://127.0.0.1:30100/registry/v3/instances?appId=default&serviceName=ProviderDemoService&version=latest'</span> <span class="se">\</span> |
| <span class="nt">-H</span> <span class="s1">'content-type: application/json'</span> <span class="se">\</span> |
| <span class="nt">-H</span> <span class="s1">'x-consumerid: d08d29edbeaa372c5be88407aa9adb00b4cb6099'</span> <span class="se">\</span> |
| <span class="nt">-H</span> <span class="s1">'x-domain-name: default'</span> |
| <span class="o">{</span> |
| <span class="s2">"instances"</span>: <span class="o">[</span> |
| <span class="o">{</span> |
| <span class="s2">"instanceId"</span>: <span class="s2">"c23da577197111e9b8b50242ac110005"</span>, |
| <span class="s2">"serviceId"</span>: <span class="s2">"fa82132706a6b75a13393d8cf48800f9689b2603"</span>, |
| <span class="s2">"endpoints"</span>: <span class="o">[</span> |
| <span class="s2">"rest://127.0.0.1:8080"</span> |
| <span class="o">]</span>, |
| <span class="s2">"hostName"</span>: <span class="s2">"provider-demo"</span>, |
| <span class="s2">"status"</span>: <span class="s2">"UP"</span>, |
| <span class="s2">"healthCheck"</span>: <span class="o">{</span> |
| <span class="s2">"mode"</span>: <span class="s2">"push"</span>, |
| <span class="s2">"interval"</span>: 30, |
| <span class="s2">"times"</span>: 3 |
| <span class="o">}</span>, |
| <span class="s2">"timestamp"</span>: <span class="s2">"1547631199"</span>, |
| <span class="s2">"modTimestamp"</span>: <span class="s2">"1547631199"</span>, |
| <span class="s2">"version"</span>: <span class="s2">"1.0.0"</span> |
| <span class="o">}</span> |
| <span class="o">]</span> |
| <span class="o">}</span> |
| </code></pre></div> </div> |
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