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Chapter 6. Setting up applications for HawtIO Online

This section shows how to deploy a Camel Quarkus app on OpenShift and make it HawtIO-enabled with Camel Quarkus. Once deployed on OpenShift, it will be discovered by HawtIO Online.

  1. This project uses Quarkus Container Images and Kubernetes extensions to build a container image and deploy it to a Kubernetes/OpenShift cluster (pom.xml).

  2. The most important part in terms of the HawtIO-enabled configuration is defined in the <properties> section. To make it HawtIO-enabled, the Jolokia agent must be attached to the application with HTTPS and SSL client-authentication configured. The client principal should match those that the HawtIO Online instance provides (the default is hawtio-online.hawtio.svc). 

    <properties>
    <jolokia.protocol>https</jolokia.protocol>
    <jolokia.host>*</jolokia.host>
    <jolokia.port>8778</jolokia.port>
    <jolokia.useSslClientAuthentication>true</jolokia.useSslClientAuthentication>
    <jolokia.caCert>/var/run/secrets/kubernetes.io/serviceaccount/service-ca.crt</jolokia.caCert>
    <jolokia.clientPrincipal.1>cn=hawtio-online.hawtio.svc</jolokia.clientPrincipal.1>
    <jolokia.extendedClientCheck>true</jolokia.extendedClientCheck>
    <jolokia.discoveryEnabled>false</jolokia.discoveryEnabled>
</properties>
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  3. Running the application locally:

    1. Run in development mode with: 

      mvn compile quarkus:dev
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    2. Or build the project and execute the runnable JAR: 

      mvn package && java -jar target/quarkus-app/quarkus-run.jar
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  4. Running with the Jolokia agent locally:

    1. You can run this example with Jolokia JVM agent locally as follows: 

      java -javaagent:target/quarkus-app/lib/main/org.jolokia.jolokia-agent-jvm-2.0.1-javaagent.jar -jar target/quarkus-app/quarkus-run.jar
      Copy to Clipboard Toggle word wrap

  5. Deploy it to OpenShift:

    1. To deploy it to a cluster, firstly change the container image parameters in pom.xml to fit the development environment. (The default image name is quay.io/hawtio/hawtio-online-example-camel-quarkus:latest, which should be pushed to the hawtio organisation on Quay.io.) 

      <!--
  Container registry and group should be changed to those which your application uses.
-->
<quarkus.container-image.registry>quay.io</quarkus.container-image.registry>
<quarkus.container-image.group>hawtio</quarkus.container-image.group>
<quarkus.container-image.tag>latest</quarkus.container-image.tag>
      Copy to Clipboard Toggle word wrap

    2. Then build the project with option -Dquarkus.container-image.push=true to push the build image to the preferred container registry: 

      mvn install -Dquarkus.container-image.push=true
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    3. The resources file for deployment is also generated at target/kubernetes/kubernetes.yml. Use kubectl or oc command to deploy the application with the resources file: 

      kubectl apply -f target/kubernetes/kubernetes.yml
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    4. After deployment is successful and the pod has started, the application log can be seen on the cluster.
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