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| <meta itemprop="headline" content="Communication on differ-structure servicecenters"> |
| <meta itemprop="description" content="Learn how to use differ-structure, multi-service center synchronization tool"> |
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| <meta itemprop="dateModified" content="November 12, 2019"> |
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| <header> |
| <h1 class="page__title" itemprop="headline">Communication on differ-structure servicecenters |
| </h1> |
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| </header> |
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| <aside class="sidebar__right"> |
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| <!-- <header><h4 class="nav__title"><i class="fa fa-file-text"></i> On This Page</h4></header> --> |
| <ul class="toc__menu" id="markdown-toc"> |
| <li><a href="#servicecenter-and-eureka" id="markdown-toc-servicecenter-and-eureka">ServiceCenter and Eureka</a> <ul> |
| <li><a href="#operating-environment" id="markdown-toc-operating-environment">Operating environment</a></li> |
| <li><a href="#before-starting" id="markdown-toc-before-starting">Before starting：</a></li> |
| <li><a href="#step-1-launch-the-eureka-environment-and-services" id="markdown-toc-step-1-launch-the-eureka-environment-and-services">Step 1: Launch the Eureka environment and services</a></li> |
| <li><a href="#step-2-start-the-servicecenter-environment-and-services" id="markdown-toc-step-2-start-the-servicecenter-environment-and-services">Step 2: Start the Servicecenter environment and services</a></li> |
| <li><a href="#step-3-results-verification" id="markdown-toc-step-3-results-verification">Step 3: Results Verification</a></li> |
| </ul> |
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| </aside> |
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| <h2 id="servicecenter-and-eureka">ServiceCenter and Eureka</h2> |
| |
| <p>Situation description：</p> |
| <ul> |
| <li>EurekaServer： The Service-center of Eureka</li> |
| <li>AccountServer：The account server of register to Eureka</li> |
| <li>Servicecomb-ServiceCenter：Servicecomb-ServiceCenter</li> |
| <li>HelloServer：The server of register to Servicecomb-ServiceCenter，that dependent on account server</li> |
| </ul> |
| |
| <p>Instances cannot be discovered and accessed by each other between different service centers, in a traditional environment. This will be easy to implement when we use Syner. As shown below: <br /> |
| <img src="/assets/images/docs/syncer/multi-servicecenters.png" alt="image" /></p> |
| |
| <h3 id="operating-environment">Operating environment</h3> |
| <ol> |
| <li>2 linux machines: （Host IP is like this：10.0.0.10 和 10.0.0.11）</li> |
| <li><a href="http://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html">JDK 1.8</a></li> |
| <li><a href="https://maven.apache.org/install.html">Maven 3.x</a></li> |
| <li><a href="https://golang.google.cn/dl/">Go 1.11.4</a></li> |
| </ol> |
| |
| <h3 id="before-starting">Before starting：</h3> |
| <ol> |
| <li><a href="/docs/products/service-center/install/">Install ServiceCenter Release（>=1.3.0）</a> |
| <div class="language-bash highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="nv">$ project_dir</span><span class="o">=</span><span class="sb">`</span><span class="nb">pwd</span><span class="sb">`</span> |
| <span class="nv">$ </span><span class="nb">tar</span> <span class="nt">-zxvf</span> apache-servicecomb-service-center-1.3.0-linux-amd64.tar.gz |
| </code></pre></div> </div> |
| </li> |
| <li>Download <a href="https://github.com/apache/servicecomb-service-center/tree/master/syncer/samples/multi-servicecenters">the sample</a> |
| <div class="language-bash highlighter-rouge"><div class="highlight"><pre class="highlight"><code>git clone https://github.com/apache/servicecomb-service-center.git |
| <span class="nb">cd</span> <span class="k">${</span><span class="nv">project_dir</span><span class="k">}</span>/servicecomb-service-center/syncer |
| </code></pre></div> </div> |
| </li> |
| </ol> |
| |
| <h3 id="step-1-launch-the-eureka-environment-and-services">Step 1: Launch the Eureka environment and services</h3> |
| <p>One of the machines： 10.0.0.10</p> |
| <h4 id="1-compile-eurekaserver-and-accountserver">1. Compile EurekaServer and AccountServer</h4> |
| <div class="language-bash highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="nv">$ </span><span class="nb">cd </span>samples/multi-servicecenters/eureka |
| <span class="nv">$ </span>mvn clean <span class="nb">install</span> |
| </code></pre></div></div> |
| <h4 id="2-run-eurekaserver">2. Run EurekaServer：</h4> |
| <ul> |
| <li>Modify the startup configuration |
| File path：${project_dir}/servicecomb-service-center/syncer/samples/multi-servicecenters/eureka/eureka-server/src/main/resources/application.yaml |
| <div class="language-yml highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="na">spring</span><span class="pi">:</span> |
| <span class="na">application</span><span class="pi">:</span> |
| <span class="na">name</span><span class="pi">:</span> <span class="s">eureka-server</span> |
| <span class="na">server</span><span class="pi">:</span> |
| <span class="na">port </span><span class="pi">:</span> <span class="m">8761</span> |
| <span class="c1"># servlet:</span> |
| <span class="c1"># context-path: /eureka</span> |
| <span class="na">eureka</span><span class="pi">:</span> |
| <span class="na">instance</span><span class="pi">:</span> |
| <span class="na">hostname </span><span class="pi">:</span> <span class="s">10.0.0.10</span> |
| <span class="na">client</span><span class="pi">:</span> |
| <span class="na">registerWithEureka </span><span class="pi">:</span> <span class="no">false</span> |
| <span class="na">fetchRegistry </span><span class="pi">:</span> <span class="no">false</span> |
| <span class="na">serviceUrl</span><span class="pi">:</span> |
| <span class="na">defaultZone </span><span class="pi">:</span> <span class="s">http://${eureka.instance.hostname}:${server.port}/eureka/</span> |
| <span class="na">management</span><span class="pi">:</span> |
| <span class="na">endpoints</span><span class="pi">:</span> |
| <span class="na">web</span><span class="pi">:</span> |
| <span class="na">exposure</span><span class="pi">:</span> |
| <span class="na">include</span><span class="pi">:</span> <span class="s2">"</span><span class="s">*"</span> |
| </code></pre></div> </div> |
| </li> |
| <li>Run server |
| <div class="language-bash highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="nv">$ </span><span class="nb">cd</span> <span class="k">${</span><span class="nv">project_dir</span><span class="k">}</span>/servicecomb-service-center/syncer/samples/multi-servicecenters/eureka/eureka-server/ |
| <span class="nv">$ </span><span class="nb">nohup </span>mvn spring-boot:run & <span class="o">>></span> eureka-server.log 2>&1 & |
| </code></pre></div> </div> |
| <p>Open http://10.0.0.10:8761 in the browser, this is successful if the following page appears.<br /> |
| <img src="/assets/images/docs/syncer/eureka-server-success.jpg" alt="image" /></p> |
| </li> |
| </ul> |
| |
| <h4 id="3-run-accountserver">3. Run AccountServer</h4> |
| <ul> |
| <li>Modify the startup configuration<br /> |
| File path：${project_dir}/servicecomb-service-center/syncer/samples/multi-servicecenters/eureka/account-server/src/main/resources/application.yaml |
| <div class="language-yml highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="na">spring</span><span class="pi">:</span> |
| <span class="na">application</span><span class="pi">:</span> |
| <span class="na">name</span><span class="pi">:</span> <span class="s">account-server</span> |
| <span class="na">server</span><span class="pi">:</span> |
| <span class="na">port</span><span class="pi">:</span> <span class="m">8090</span> |
| <span class="na">eureka</span><span class="pi">:</span> |
| <span class="na">instance</span><span class="pi">:</span> |
| <span class="na">hostname</span><span class="pi">:</span> <span class="s">10.0.0.10</span> |
| <span class="na">client</span><span class="pi">:</span> |
| <span class="na">service-url</span><span class="pi">:</span> |
| <span class="na">defaultZone</span><span class="pi">:</span> <span class="s">http://${eureka.instance.hostname}:8761/eureka/</span> |
| <span class="na">management</span><span class="pi">:</span> |
| <span class="na">endpoints</span><span class="pi">:</span> |
| <span class="na">web</span><span class="pi">:</span> |
| <span class="na">exposure</span><span class="pi">:</span> |
| <span class="na">include</span><span class="pi">:</span> <span class="s2">"</span><span class="s">*"</span> |
| </code></pre></div> </div> |
| </li> |
| <li>Start AccountServer |
| <div class="language-bash highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="nv">$ </span><span class="nb">cd</span> <span class="k">${</span><span class="nv">project_dir</span><span class="k">}</span>/servicecomb-service-center/syncer/samples/multi-servicecenters/eureka/account-server |
| <span class="nv">$ </span>mvn spring-boot:run |
| <span class="c">#This is successful if the result like this，</span> |
| 2019-09-19 17:20:35.534 INFO 20890 <span class="nt">---</span> <span class="o">[</span> main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat started on port<span class="o">(</span>s<span class="o">)</span>: 8090 <span class="o">(</span>http<span class="o">)</span> with context path <span class="s1">''</span> |
| 2019-09-19 17:20:35.548 INFO 20890 <span class="nt">---</span> <span class="o">[</span> main] .s.c.n.e.s.EurekaAutoServiceRegistration : Updating port to 8090 |
| 2019-09-19 17:20:35.551 INFO 20890 <span class="nt">---</span> <span class="o">[</span> main] o.a.s.s.account.AccountApplication : Started AccountApplication <span class="k">in </span>3.92 seconds <span class="o">(</span>JVM running <span class="k">for </span>6.754<span class="o">)</span> |
| 2019-09-19 17:20:35.617 INFO 20890 <span class="nt">---</span> <span class="o">[</span>nfoReplicator-0] com.netflix.discovery.DiscoveryClient : DiscoveryClient_ACCOUNT-SERVER/10.0.0.10:account-server:8090 - registration status: 204 |
| </code></pre></div> </div> |
| <p>Reopen http://10.0.0.10:8761, you can see that AccountServer has been registered successfully.<br /> |
| <img src="/assets/images/docs/syncer/eureka-account-server-success.jpg" alt="image" /></p> |
| </li> |
| </ul> |
| |
| <h4 id="4-run-syncer-of-eureka">4. Run Syncer of eureka</h4> |
| <div class="language-bash highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="nv">$ </span><span class="nb">cd</span> <span class="k">${</span><span class="nv">project_dir</span><span class="k">}</span>/apache-servicecomb-service-center-1.3.0-linux-amd64/ |
| <span class="nv">$ </span>./syncer daemon <span class="nt">--sc-addr</span> http://10.0.0.10:8761/eureka <span class="nt">--bind-addr</span> 10.0.0.10:30190 <span class="nt">--rpc-addr</span> 10.0.0.10:30191 <span class="nt">--sc-plugin</span><span class="o">=</span>eureka <span class="nt">--node</span> eureka |
| <span class="c">#This is successful if the result like this，</span> |
| 2019-09-19T17:28:28.809+0800 INFO etcd/agent.go:55 start etcd success |
| 2019-09-19T17:28:28.809+0800 INFO grpc/server.go:94 start grpc success |
| 2019-09-19T17:28:28.809+0800 DEBUG server/handler.go:39 is leader: <span class="nb">true |
| </span>2019-09-19T17:28:28.809+0800 DEBUG server/handler.go:43 Handle Tick |
| </code></pre></div></div> |
| |
| <h3 id="step-2-start-the-servicecenter-environment-and-services">Step 2: Start the Servicecenter environment and services</h3> |
| <p>Another machine： 10.0.0.11</p> |
| <h4 id="1-compile-helloserver">1. Compile HelloServer</h4> |
| <div class="language-bash highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="nv">$ </span><span class="nb">cd</span> <span class="k">${</span><span class="nv">project_dir</span><span class="k">}</span>/servicecomb-service-center/syncer/samples/multi-servicecenters/servicecenter/hello-server/ |
| <span class="nv">$ GO111MODULE</span><span class="o">=</span>on go build |
| </code></pre></div></div> |
| <h4 id="2-run-servicecenter">2. Run Servicecenter</h4> |
| <ul> |
| <li>Modify the startup configuration：<br /> |
| File path：${project_dir}/apache-servicecomb-service-center-1.3.0-linux-amd64/conf/app.conf |
| <div class="language-bash highlighter-rouge"><div class="highlight"><pre class="highlight"><code>frontend_host_ip <span class="o">=</span> 10.0.0.11 |
| frontend_host_port <span class="o">=</span> 30103 |
| <span class="c">#sever options</span> |
| <span class="c">#if you want to listen at ipv6 address, then set the httpaddr value like:</span> |
| <span class="c">#httpaddr = 2400:A480:AAAA:200::159 (global scope)</span> |
| <span class="c">#httpaddr = fe80::f816:3eff:fe17:c38b%eth0 (link-local scope)</span> |
| httpaddr <span class="o">=</span> 10.0.0.11 |
| httpport <span class="o">=</span> 30100 |
| <span class="c">#...以下省略...</span> |
| </code></pre></div> </div> |
| </li> |
| <li>Run ServiceCenter and Frontend |
| <div class="language-bash highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="nv">$ </span><span class="nb">cd</span> <span class="k">${</span><span class="nv">project_dir</span><span class="k">}</span>/apache-servicecomb-service-center-1.3.0-linux-amd64 |
| <span class="nv">$ </span>./start-service-center.sh |
| <span class="nv">$ </span>./start-frontend.sh |
| </code></pre></div> </div> |
| <p>Open http://10.0.0.11:30103 in the browser, this is successful if the following page appears. <br /> |
| <img src="/assets/images/docs/syncer/service-center-server-success.jpg" alt="image" /></p> |
| </li> |
| </ul> |
| |
| <h4 id="3-run-helloserver">3. Run HelloServer</h4> |
| <ul> |
| <li>Modify the startup configuration<br /> |
| File path：${project_dir}/servicecomb-service-center/syncer/samples/multi-servicecenters/servicecenter/hello-server/conf/microservice.yaml |
| <div class="language-yml highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="na">service</span><span class="pi">:</span> <span class="c1"># Micro service configuration</span> |
| <span class="na">appId</span><span class="pi">:</span> <span class="s">eureka</span> <span class="c1"># The appID is "eureka", if the instance synced from eureka.</span> |
| <span class="na">name</span><span class="pi">:</span> <span class="s">hello-server</span> |
| <span class="na">version</span><span class="pi">:</span> <span class="s">0.0.1</span> |
| <span class="na">instance</span><span class="pi">:</span> <span class="c1"># Instance information</span> |
| <span class="na">protocol</span><span class="pi">:</span> <span class="s">rest</span> |
| <span class="na">listenAddress</span><span class="pi">:</span> <span class="s">10.0.0.11:8091</span> <span class="c1">#The listening address of the instance</span> |
| <span class="na">provider</span><span class="pi">:</span> <span class="c1"># Provider information</span> |
| <span class="na">appId</span><span class="pi">:</span> <span class="s">eureka</span> |
| <span class="na">name</span><span class="pi">:</span> <span class="s">account-server</span> |
| <span class="na">version</span><span class="pi">:</span> <span class="s">0.0.1</span> |
| <span class="na">registry</span><span class="pi">:</span> |
| <span class="na">address</span><span class="pi">:</span> <span class="s">http://10.0.0.11:30100</span> |
| </code></pre></div> </div> |
| </li> |
| <li>Start HelloServer |
| <div class="language-bash highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="nv">$ </span><span class="nb">cd</span> <span class="k">${</span><span class="nv">project_dir</span><span class="k">}</span>/servicecomb-service-center/syncer/samples/multi-servicecenters/servicecenter/hello-server |
| <span class="nv">$ </span>./hello-server |
| 2019-09-19T18:37:50.645+0800 DEBUG servicecenter/servicecenter.go:163 send heartbeat success |
| 2019-09-19T18:37:50.645+0800 WARN servicecenter/servicecenter.go:85 discovery provider failed, appID <span class="o">=</span> eureka, name <span class="o">=</span> account-server, version <span class="o">=</span> 0.0.1 |
| 2019-09-19T18:37:50.645+0800 INFO servicecenter/servicecenter.go:87 waiting <span class="k">for </span>retry |
| </code></pre></div> </div> |
| <p>Reopen http://10.0.0.11:30103, you can see that HelloServer has been registered successfully. <br /> |
| <img src="/assets/images/docs/syncer/service-center-hello-server-success.jpg" alt="image" /><br /> |
| But, the instance of AccountServer belonging to the EurekaServer cannot be found, the HelloServer is in the retry state. <br /> |
| (<strong><em>Warning</em></strong>: We must complete the operation within 3 retry times (90 seconds))</p> |
| </li> |
| </ul> |
| |
| <h4 id="4run-syncer-of-service-center">4.Run Syncer of service-center</h4> |
| <div class="language-bash highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="nv">$ </span><span class="nb">cd</span> <span class="k">${</span><span class="nv">project_dir</span><span class="k">}</span>/apache-servicecomb-service-center-1.3.0-linux-amd64/ |
| <span class="nv">$ </span>./syncer daemon <span class="nt">--sc-addr</span> http://10.0.0.11:30100 <span class="nt">--bind-addr</span> 10.0.0.11:30190 <span class="nt">--rpc-addr</span> 10.0.0.11:30191 <span class="nt">--sc-plugin</span><span class="o">=</span>servicecenter <span class="nt">--join-addr</span> 10.0.0.10:30190 <span class="nt">--node</span> servicecenter |
| <span class="c">#This is successful if the result like this，</span> |
| 2019-09-19T18:44:35.536+0800 DEBUG server/handler.go:62 is leader: <span class="nb">true |
| </span>2019-09-19T18:44:35.536+0800 DEBUG server/handler.go:79 Receive serf user event |
| 2019-09-19T18:44:35.536+0800 DEBUG serf/agent.go:130 member <span class="o">=</span> servicecenter, groupName <span class="o">=</span> 0204d59328090c2f4449a088d4e0f1d8 |
| 2019-09-19T18:44:35.536+0800 DEBUG serf/agent.go:130 member <span class="o">=</span> eureka, groupName <span class="o">=</span> 34f53a9520a11c01f02f58f733e856b3 |
| 2019-09-19T18:44:35.536+0800 DEBUG server/handler.go:97 Going to pull data from eureka 10.0.0.10:30191 |
| 2019-09-19T18:44:35.536+0800 INFO grpc/client.go:76 Create new grpc connection to 10.0.0.10:30191 |
| 2019-09-19T18:44:35.538+0800 DEBUG servicecenter/servicecenter.go:87 create service success <span class="nv">orgServiceID</span><span class="o">=</span> account-server, curServiceID <span class="o">=</span> 80784229255ec96d90353e3c041bdf3586fdbbae |
| 2019-09-19T18:44:35.538+0800 DEBUG servicecenter/servicecenter.go:90 trying to <span class="k">do </span>registration of instance, instanceID <span class="o">=</span> 10.0.0.10:account-server:8090 |
| 2019-09-19T18:44:35.540+0800 DEBUG servicecenter/sync.go:63 Registered instance successful, instanceID <span class="o">=</span> 78bca3e2daca11e99638fa163eca30e0 |
| </code></pre></div></div> |
| |
| <h3 id="step-3-results-verification">Step 3: Results Verification</h3> |
| <ol> |
| <li> |
| <p>At this point, HelloServer gets the instance successfully, and calls the CheckHealth interface of AccountServer.<br /> |
| <img src="/assets/images/docs/syncer/hello-server-discovery-success.jpg" alt="image" /></p> |
| </li> |
| <li>Open the website of Euraka and ServiceCenter respectively. Both service centers contain all the instance information.<br /> |
| <img src="/assets/images/docs/syncer/eureka-server-has-all.jpg" alt="image" /> <br /> |
| <img src="/assets/images/docs/syncer/service-center-server-has-all.jpg" alt="image" /></li> |
| <li>Call the Login interface of HelloServer used the command line of curl, |
| <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://192.168.88.75:8091/login <span class="se">\</span> |
| <span class="nt">-H</span> <span class="s1">'Content-Type: application/json'</span> <span class="se">\</span> |
| <span class="nt">-d</span> <span class="s1">'{ |
| "user":"Jack", |
| "password":"123456" |
| }'</span> |
| welcome Jack |
| </code></pre></div> </div> |
| <p>HelloServer and AccountServer respectively print the following information. <br /> |
| AccountServer<br /> |
| <img src="/assets/images/docs/syncer/account-server-reply.jpg" alt="image" /> <br /> |
| HelloServer <br /> |
| <img src="/assets/images/docs/syncer/hello-server-result.jpg" alt="image" /></p> |
| </li> |
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