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<title>Lab 16 - Leveraging Eureka for Service Discovery via Spring Cloud Netflix</title>
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</head>
<body class="article">
<div id="header">
<h1>Lab 16 - Leveraging Eureka for Service Discovery via Spring Cloud Netflix</h1>
</div>
<div id="content">
<div id="preamble">
<div class="sectionbody">
<div class="quoteblock abstract">
<blockquote>
<div class="paragraph">
<p>Let’s continue learning the components found in Spring Cloud to implement patterns for distributed systems.
We’ll use Spring Cloud Netflix to deploy Eureka, which is a component offering service registration and discovery.</p>
</div>
<div class="paragraph">
<p>In this lab, we’ll do the following:</p>
</div>
<div class="olist arabic">
<ol class="arabic">
<li>
<p>Create a Eureka server</p>
</li>
<li>
<p>Create two applications, a “producer” and a “consumer,” wire them up using Eureka, and test them.</p>
</li>
<li>
<p>Deploy the Eureka server to Pivotal Cloud Foundry</p>
</li>
<li>
<p>Update our previously developed microservices to register themselves with Eureka</p>
</li>
</ol>
</div>
</blockquote>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_creating_a_eureka_server">Creating a Eureka Server</h2>
<div class="sectionbody">
<div class="olist arabic">
<ol class="arabic">
<li>
<p>Change to the lab directory:</p>
<div class="listingblock">
<div class="content">
<pre>$ cd $COURSE_HOME/day_02/session_05/lab_16/initial/springbox-eureka</pre>
</div>
</div>
<div class="paragraph">
<p>and import the project (via <code>pom.xml</code>) into your IDE of choice.</p>
</div>
</li>
<li>
<p>Open <code>pom.xml</code>, change the parent POM to the <code>spring-cloud-starter-parent</code>:</p>
<div class="listingblock">
<div class="content">
<pre><parent>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-parent</artifactId>
<version>1.0.1.RELEASE</version>
<relativePath/>
<!-- lookup parent from repository -->
</parent></pre>
</div>
</div>
</li>
<li>
<p>Add the following repository to resolve the <code>1.0.1.RELEASE</code> artifacts:</p>
<div class="listingblock">
<div class="content">
<pre><repositories>
<repository>
<id>spring-release</id>
<name>Spring Release</name>
<url>https://repo.spring.io/release/</url>
<snapshots>
<enabled>true</enabled>
</snapshots>
</repository>
</repositories></pre>
</div>
</div>
</li>
<li>
<p>Add a dependency on <code>spring-cloud-starter-eureka-server</code>:</p>
<div class="listingblock">
<div class="content">
<pre><dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-eureka-server</artifactId>
</dependency></pre>
</div>
</div>
</li>
<li>
<p>Also, update the <code>spring-boot-maven-plugin</code> configuration to indicate that jars containing JAX-RS resources should be unpacked:</p>
<div class="listingblock">
<div class="content">
<pre><plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
<configuration>
<requiresUnpack>
<dependency>
<groupId>com.netflix.eureka</groupId>
<artifactId>eureka-core</artifactId>
</dependency>
<dependency>
<groupId>com.netflix.eureka</groupId>
<artifactId>eureka-client</artifactId>
</dependency>
</requiresUnpack>
</configuration>
</plugin></pre>
</div>
</div>
</li>
<li>
<p>In <code>io.springbox.eureka.SpringboxEurekaApplication</code>, add the <code>@EnableEurekaServer</code> annotation:</p>
<div class="listingblock">
<div class="content">
<pre>@SpringBootApplication
@EnableEurekaServer // <-- ADD THIS!
public class SpringboxEurekaApplication {
public static void main(String[] args) {
SpringApplication.run(SpringboxEurekaApplication.class, args);
}
}</pre>
</div>
</div>
</li>
<li>
<p>Rename <code>src/main/resources/application.properties</code> to <code>src/main/resources/application.yml</code>, and paste in the following source:</p>
<div class="listingblock">
<div class="content">
<pre>server:
port: 8761
eureka:
instance:
hostname: localhost
client:
registerWithEureka: false
fetchRegistry: false
serviceUrl:
defaultZone: http://${eureka.instance.hostname}:${server.port}/eureka/</pre>
</div>
</div>
</li>
<li>
<p>Build the application:</p>
<div class="listingblock">
<div class="content">
<pre>$ mvn package</pre>
</div>
</div>
</li>
<li>
<p>Run the application:</p>
<div class="listingblock">
<div class="content">
<pre>$ java -jar target/springbox-eureka-0.0.1-SNAPSHOT.jar</pre>
</div>
</div>
</li>
<li>
<p>In a browser, visit <a href="http://localhost:8761" class="bare">http://localhost:8761</a> and verify that everything is working properly:</p>
<div class="imageblock">
<div class="content">
<img src="../../../Common/images/eureka_1.png" alt="eureka 1">
</div>
</div>
</li>
</ol>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_create_and_register_the_producer_service">Create and Register the Producer Service</h2>
<div class="sectionbody">
<div class="olist arabic">
<ol class="arabic">
<li>
<p>Change to the lab directory:</p>
<div class="listingblock">
<div class="content">
<pre>$ cd $COURSE_HOME/day_02/session_05/lab_16/initial/springbox-producer</pre>
</div>
</div>
<div class="paragraph">
<p>and import the project (via <code>pom.xml</code>) into your IDE of choice.</p>
</div>
</li>
<li>
<p>Open <code>pom.xml</code>, change the parent POM to the <code>spring-cloud-starter-parent</code>:</p>
<div class="listingblock">
<div class="content">
<pre><parent>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-parent</artifactId>
<version>1.0.1.RELEASE</version>
<relativePath/>
<!-- lookup parent from repository -->
</parent></pre>
</div>
</div>
</li>
<li>
<p>Add a dependency on <code>spring-cloud-starter</code> and <code>spring-cloud-starter-eureka</code>:</p>
<div class="listingblock">
<div class="content">
<pre><dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-eureka</artifactId>
</dependency></pre>
</div>
</div>
</li>
<li>
<p>In the package <code>io.springbox.producer</code>, create the class <code>ProducerController</code>.
Into that class paste the following code:</p>
<div class="listingblock">
<div class="content">
<pre>@RestController
public class ProducerController {
private Log log = LogFactory.getLog(ProducerController.class);
private AtomicInteger counter = new AtomicInteger(0);
@RequestMapping(value = "/", produces = "application/json")
public String produce() {
int value = counter.getAndIncrement();
log.info("Produced a value: " + value);
return String.format("{\"value\":%d}", value);
}
}</pre>
</div>
</div>
</li>
<li>
<p>Now open <code>io.springbox.producer.SpringboxProducerApplication</code> and add the <code>@EnableDiscoveryClient</code> annotation:</p>
<div class="listingblock">
<div class="content">
<pre>@SpringBootApplication
@EnableDiscoveryClient // <--- ADD THIS!
public class SpringboxProducerApplication {
public static void main(String[] args) {
SpringApplication.run(SpringboxProducerApplication.class, args);
}
}</pre>
</div>
</div>
</li>
<li>
<p>Create the file <code>src/main/resources/bootstrap.yml</code> and paste in the following source:</p>
<div class="listingblock">
<div class="content">
<pre>spring:
application:
name: producer</pre>
</div>
</div>
</li>
<li>
<p>We’ll use our Config Server to consistently configure the Eureka Client across all of our applications.
In your config repo, open <code>application.yml</code> and add the following:</p>
<div class="listingblock">
<div class="content">
<pre>eureka:
instance:
leaseRenewalIntervalInSeconds: 10
metadataMap:
instanceId: ${vcap.application.instance_id:${spring.application.name}:${server.port:8080}}</pre>
</div>
</div>
</li>
<li>
<p>Stage, commit, and push your changes:</p>
<div class="listingblock">
<div class="content">
<pre>git add . && git commit -m "swap greeting" && git push origin master</pre>
</div>
</div>
</li>
<li>
<p>A completed <code>springbox-config-server</code> project has been placed in <code>$COURSE_HOME/day_02/session_05/lab_15/initial/springbox-config-server</code> for your convenience.
In a different terminal window, change to that directory, rebuild, and run the application:</p>
<div class="listingblock">
<div class="content">
<pre>$ cd $COURSE_HOME/day_02/session_05/lab_16/initial/springbox-config-server
$ mvn package
$ java -jar target/springbox-config-server-0.0.1-SNAPSHOT.jar</pre>
</div>
</div>
</li>
<li>
<p>Now build the producer application:</p>
<div class="listingblock">
<div class="content">
<pre>$ mvn package</pre>
</div>
</div>
</li>
<li>
<p>And run the producer application:</p>
<div class="listingblock">
<div class="content">
<pre>$ java -jar target/springbox-producer-0.0.1-SNAPSHOT.jar</pre>
</div>
</div>
</li>
<li>
<p>Ten seconds after the producer application finishes startup, you should see it log its registration with Eureka:</p>
<div class="listingblock">
<div class="content">
<pre>2015-02-18 22:56:00.226 INFO 42160 --- [pool-4-thread-1] com.netflix.discovery.DiscoveryClient : DiscoveryClient_PRODUCER/turkey:producer:8080 - Re-registering apps/PRODUCER
2015-02-18 22:56:00.227 INFO 42160 --- [pool-4-thread-1] com.netflix.discovery.DiscoveryClient : DiscoveryClient_PRODUCER/turkey:producer:8080: registering service...
2015-02-18 22:56:00.274 INFO 42160 --- [pool-4-thread-1] com.netflix.discovery.DiscoveryClient : DiscoveryClient_PRODUCER/turkey:producer:8080 - registration status: 204</pre>
</div>
</div>
<div class="paragraph">
<p>You should also be able to refresh <a href="http://localhost:8761" class="bare">http://localhost:8761</a> in the browser and see the producer registered:</p>
</div>
<div class="imageblock">
<div class="content">
<img src="../../../Common/images/eureka_2.png" alt="eureka 2">
</div>
</div>
</li>
</ol>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_create_and_register_the_consumer_service">Create and Register the Consumer Service</h2>
<div class="sectionbody">
<div class="olist arabic">
<ol class="arabic">
<li>
<p>Change to the lab directory:</p>
<div class="listingblock">
<div class="content">
<pre>$ cd $COURSE_HOME/day_02/session_05/lab_16/initial/springbox-consumer</pre>
</div>
</div>
<div class="paragraph">
<p>and import the project (via <code>pom.xml</code>) into your IDE of choice.</p>
</div>
</li>
<li>
<p>Open <code>pom.xml</code>, change the parent POM to the <code>spring-cloud-starter-parent</code>:</p>
<div class="listingblock">
<div class="content">
<pre><parent>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-parent</artifactId>
<version>1.0.1.RELEASE</version>
<relativePath/>
<!-- lookup parent from repository -->
</parent></pre>
</div>
</div>
</li>
<li>
<p>Add a dependency on <code>spring-cloud-starter</code> and <code>spring-cloud-starter-eureka</code>:</p>
<div class="listingblock">
<div class="content">
<pre><dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-eureka</artifactId>
</dependency></pre>
</div>
</div>
</li>
<li>
<p>In the package <code>io.springbox.consumer</code>, create the class <code>ProducerResponse</code>, and into that class paste the following code:</p>
<div class="listingblock">
<div class="content">
<pre>public class ProducerResponse {
private int value;
public void setValue(int value) {
this.value = value;
}
public int getValue() {
return value;
}
}</pre>
</div>
</div>
</li>
<li>
<p>Also in the package <code>io.springbox.consumer</code>, create the class <code>ConsumerController</code>, and into that class paste the following code:</p>
<div class="listingblock">
<div class="content">
<pre>@RestController
public class ConsumerController {
@Autowired
DiscoveryClient discoveryClient;
@RequestMapping(value = "/", produces = "application/json")
String consume() {
InstanceInfo instance = discoveryClient.getNextServerFromEureka("PRODUCER", false);
RestTemplate restTemplate = new RestTemplate();
ProducerResponse response = restTemplate.getForObject(instance.getHomePageUrl(), ProducerResponse.class);
return String.format("{\"value\":%d}", response.getValue());
}
}</pre>
</div>
</div>
</li>
<li>
<p>Now open <code>io.springbox.producer.SpringboxConsumerrApplication</code> and add the <code>@EnableDiscoveryClient</code> annotation:</p>
<div class="listingblock">
<div class="content">
<pre>@SpringBootApplication
@EnableDiscoveryClient // <--- ADD THIS!
public class SpringboxConsumerApplication {
public static void main(String[] args) {
SpringApplication.run(SpringboxConsumerApplication.class, args);
}
}</pre>
</div>
</div>
</li>
<li>
<p>In <code>src/main/resources/application.properties</code>, set the <code>server.port</code> property:</p>
<div class="listingblock">
<div class="content">
<pre>server.port=8081</pre>
</div>
</div>
</li>
<li>
<p>Create the file <code>src/main/resources/bootstrap.yml</code> and paste in the following source:</p>
<div class="listingblock">
<div class="content">
<pre>spring:
application:
name: consumer</pre>
</div>
</div>
</li>
<li>
<p>Now build the consumer application:</p>
<div class="listingblock">
<div class="content">
<pre>$ mvn package</pre>
</div>
</div>
</li>
<li>
<p>And run the consumer application:</p>
<div class="listingblock">
<div class="content">
<pre>$ java -jar target/springbox-consumer-0.0.1-SNAPSHOT.jar</pre>
</div>
</div>
</li>
<li>
<p>Ten seconds after the consumer application finishes startup, you should see it log its registration with Eureka:</p>
<div class="listingblock">
<div class="content">
<pre>2015-02-18 23:29:55.703 INFO 45265 --- [pool-4-thread-1] com.netflix.discovery.DiscoveryClient : DiscoveryClient_CONSUMER/turkey:consumer:8081 - Re-registering apps/CONSUMER
2015-02-18 23:29:55.703 INFO 45265 --- [pool-4-thread-1] com.netflix.discovery.DiscoveryClient : DiscoveryClient_CONSUMER/turkey:consumer:8081: registering service...
2015-02-18 23:29:55.729 INFO 45265 --- [pool-4-thread-1] com.netflix.discovery.DiscoveryClient : DiscoveryClient_CONSUMER/turkey:consumer:8081 - registration status: 204</pre>
</div>
</div>
<div class="paragraph">
<p>You should also be able to refresh <a href="http://localhost:8761" class="bare">http://localhost:8761</a> in the browser and see the producer registered:</p>
</div>
<div class="imageblock">
<div class="content">
<img src="../../../Common/images/eureka_3.png" alt="eureka 3">
</div>
</div>
</li>
<li>
<p>Using <code>curl</code>, test the consumer application and show that it is receiving values from the producer:</p>
<div class="listingblock">
<div class="content">
<pre>curl -i localhost:8081
HTTP/1.1 200 OK
Content-Length: 11
Content-Type: application/json;charset=UTF-8Date: Thu, 19 Feb 2015 07:32:21 GMT
Server: Apache-Coyote/1.1
X-Application-Context: consumer:8081
{
"value": 0
}</pre>
</div>
</div>
</li>
</ol>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_deploy_the_eureka_server_to_cloud_foundry">Deploy the Eureka Server to Cloud Foundry</h2>
<div class="sectionbody">
<div class="olist arabic">
<ol class="arabic">
<li>
<p>Create an application manifest in <code>manifest.yml</code>:</p>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-yml" data-lang="yml">---
applications:
- name: springbox-eureka
host: springbox-eureka-${random-word}
memory: 512M
instances: 1
path: target/springbox-eureka-0.0.1-SNAPSHOT.jar</code></pre>
</div>
</div>
</li>
<li>
<p>Push to Cloud Foundry:</p>
<div class="listingblock">
<div class="content">
<pre>$ cf push
...
Showing health and status for app springbox-eureka in org oreilly-class / space instructor as [email protected]...
OK
requested state: started
instances: 1/1
usage: 512M x 1 instances
urls: springbox-eureka-blowsy-catechizer.cfapps.io
last uploaded: Thu Feb 19 07:40:21 UTC 2015
state since cpu memory disk
#0 running 2015-02-18 11:41:10 PM 0.3% 386.1M of 512M 135.1M of 1G</pre>
</div>
</div>
</li>
<li>
<p>In a browser, visit the route assigned to your Eureka server and verify that everything is working properly:</p>
<div class="imageblock">
<div class="content">
<img src="../../../Common/images/eureka_1.png" alt="eureka 1">
</div>
</div>
</li>
<li>
<p>Create a user-provided service representing the Eureka server (be sure to use the route assigned to your Eureka server!):</p>
<div class="listingblock">
<div class="content">
<pre>$ cf cups springbox-service-registry -p '{"uri":"http://springbox-service-registry-unmaritime-acidification.cfapps.io"}'
Creating user provided service springbox-service-registry in org oreilly-class / space instructor as [email protected]...
OK</pre>
</div>
</div>
</li>
</ol>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_update_the_microservices_to_use_eureka">Update the Microservices to Use Eureka</h2>
<div class="sectionbody">
<div class="olist arabic">
<ol class="arabic">
<li>
<p>In the config repo, update the eureka section of application.yml:</p>
<div class="listingblock">
<div class="content">
<pre>eureka: