2.2. 部署 Camel Spring Boot 应用程序

流程

1. 将 openshift-maven-plugin 添加到 monitoring-micrometrics-grafana-prometheus 示例中的 pom.xml 文件中。在 pom.xml 中，添加一个 openshift 配置集，以允许通过 openshift-maven-plugin 部署到 openshift。

       <profiles>
           <profile>
               <id>openshift</id>
               <build>
                   <plugins>
                       <plugin>
                           <groupId>org.eclipse.jkube</groupId>
                           <artifactId>openshift-maven-plugin</artifactId>
                           <version>1.13.1</version>
                           <executions>
                               <execution>
                                   <goals>
                                       <goal>resource</goal>
                                       <goal>build</goal>
                                   </goals>
                               </execution>
                           </executions>
                       </plugin>
                   </plugins>
               </build>
           </profile>
       </profiles>

2. 添加 Prometheus 支持。要将 Prometheus 支持添加到 Camel Spring Boot 应用程序，请在 actuator 端点上公开 Prometheus 统计。

   1. 编辑 src/main/resources/application.properties 文件。如果您有 management.endpoints.web.exposure.include 条目，请添加 prometheus、metrics 和 health。如果您没有 management.endpoints.web.exposure.include 条目，请添加一个。

      # expose actuator endpoint via HTTP
      management.endpoints.web.exposure.include=mappings,metrics,health,shutdown,jolokia,prometheus

3. 将以下内容添加到 pom.xml 的 <dependencies /> 部分，为您的应用程序添加一些入门支持。

   <dependency>
       <groupId>io.micrometer</groupId>
       <artifactId>micrometer-registry-prometheus</artifactId>
   </dependency>
   
   <dependency>
       <groupId>org.jolokia</groupId>
       <artifactId>jolokia-core</artifactId>
       <version>${jolokia-version}</version>
   </dependency>
   
   <dependency>
       <groupId>io.prometheus.jmx</groupId>
       <artifactId>collector</artifactId>
       <version>${prometheus-version}</version>
   </dependency>

4. 将以下内容添加到 Camel Spring Boot 应用程序的 Application.java 中。

   import org.springframework.context.annonation.Bean;
   import org.apache.camel.component.micrometer.MicrometerConstants;
   import org.apache.camel.component.micrometer.eventnotifier.MicrometerExchangeEventNotifier;
   import org.apache.camel.component.micrometer.eventnotifier.MicrometerRouteEventNotifier;
   import org.apache.camel.component.micrometer.messagehistory.MicrometerMessageHistoryFactory;
   import org.apache.camel.component.micrometer.routepolicy.MicrometerRoutePolicyFactory;

5. 更新的 Application.java 如下所示。

   @SpringBootApplication
   public class SampleCamelApplication {
   
   @Bean(name = {MicrometerConstants.METRICS_REGISTRY_NAME, "prometheusMeterRegistry"})
   public PrometheusMeterRegistry prometheusMeterRegistry(
           PrometheusConfig prometheusConfig, CollectorRegistry collectorRegistry, Clock clock) throws MalformedObjectNameException, IOException {
   
       InputStream resource = new ClassPathResource("config/prometheus_exporter_config.yml").getInputStream();
   
       new JmxCollector(resource).register(collectorRegistry);
       new BuildInfoCollector().register(collectorRegistry);
       return new PrometheusMeterRegistry(prometheusConfig, collectorRegistry, clock);
   }
   
   @Bean
   public CamelContextConfiguration camelContextConfiguration(@Autowired PrometheusMeterRegistry registry) {
   
       return new CamelContextConfiguration() {
           @Override
           public void beforeApplicationStart(CamelContext camelContext) {
               MicrometerRoutePolicyFactory micrometerRoutePolicyFactory = new MicrometerRoutePolicyFactory();
               micrometerRoutePolicyFactory.setMeterRegistry(registry);
               camelContext.addRoutePolicyFactory(micrometerRoutePolicyFactory);
   
               MicrometerMessageHistoryFactory micrometerMessageHistoryFactory = new MicrometerMessageHistoryFactory();
               micrometerMessageHistoryFactory.setMeterRegistry(registry);
               camelContext.setMessageHistoryFactory(micrometerMessageHistoryFactory);
   
               MicrometerExchangeEventNotifier micrometerExchangeEventNotifier =  new MicrometerExchangeEventNotifier();
               micrometerExchangeEventNotifier.setMeterRegistry(registry);
               camelContext.getManagementStrategy().addEventNotifier(micrometerExchangeEventNotifier);
   
               MicrometerRouteEventNotifier micrometerRouteEventNotifier = new MicrometerRouteEventNotifier();
               micrometerRouteEventNotifier.setMeterRegistry(registry);
               camelContext.getManagementStrategy().addEventNotifier(micrometerRouteEventNotifier);
   
           }
   
           @Override
           public void afterApplicationStart(CamelContext camelContext) {
           }
       };
   }

6. 将应用部署到 OpenShift。

   mvn -Popenshift oc:deploy

7. 验证您的应用程序是否已部署。

   oc get pods -n myapp
   
   NAME                                        READY   STATUS      RESTARTS   AGE
   camel-example-spring-boot-xml-2-deploy      0/1     Completed   0          13m
   camel-example-spring-boot-xml-2-x78rk       1/1     Running     0          13m
   camel-example-spring-boot-xml-s2i-2-build   0/1     Completed   0          14m

8. 添加此应用程序的 Service Monitor，以便 Openshift 的 prometheus 实例可以从 / actuator/prometheus 端点开始提取。

   1. 为 Service monitor 创建以下 YAML 清单。在本例中，该文件被命名为 servicemonitor.yaml。

      apiVersion: monitoring.coreos.com/v1
      kind: ServiceMonitor
      metadata:
        labels:
          k8s-app: csb-demo-monitor
        name: csb-demo-monitor
      spec:
        endpoints:
        - interval: 30s
          port: http
          scheme: http
          path: /actuator/prometheus
        selector:
          matchLabels:
            app: camel-example-spring-boot-xml

   2. 为此应用程序添加 Service Monitor。

      oc apply -f servicemonitor.yml
      servicemonitor.monitoring.coreos.com/csb-demo-monitor "myapp" created

9. 验证服务监控器是否已成功部署。

   oc get servicemonitor
   
   NAME                   AGE
   csb-demo-monitor       9m17s

10. 验证您可以在提取目标列表中看到服务监控器。在 Administrator 视图中，进入到 Observe Targets。您可以在提取目标列表中找到 csb-demo-monitor。
11. 在部署 servicemonitor 后等待大约十分钟。然后进入到 Developer 视图中的 Observe Metrics。在下拉菜单中选择 Custom query 并键入 camel 来查看通过 /actuator/prometheus 端点公开的 Camel 指标。