K8s Deployment Sample 3: JMS Sender/Receiver

Let's define a JMS (sender and receiver) scenario using WSO2 Micro Integrator and deploy it on your Kubernetes environment.

Prerequisites

Step 1: Create the integration solution

Follow the steps given below.

  1. Create a Maven Multi Module project using WSO2 Integration Studio.

    Create Maven Multi Module Project

  2. Create an ESB Config Project inside the Maven Multi Module project:

    Right-click the Maven Multi Module project in the project explorer, go to New → Project, and select ESB Config Project to open the New ESB Config Project dialog.

    Create ESB Config Project

  3. Add the following proxy service configuration to your ESB Config Project. This service listens to messages from ActiveMQ and publishes to another queue in ActiveMQ.

    1. Right-click the ESB Config project in the project explorer, go to New -> Proxy Service and create a custom proxy service named JmsSenderListener. Create ESB Config Project

    2. You can then use the Source View to copy the following configuration.

      Tip

      Be sure to update the tcp://localhost:61616 URL given below with the actual/connecting URL that will be reachable from the Kubernetes pod.

      <?xml version="1.0" encoding="UTF-8"?>
<proxy name="JmsSenderListener" startOnLoad="true" transports="jms" xmlns="http://ws.apache.org/ns/synapse">
    <target>
        <inSequence>
            <send>
                <endpoint>
                    <address uri="jms:/secondQueue?transport.jms.ConnectionFactoryJNDIName=QueueConnectionFactory&amp;java.naming.factory.initial=org.apache.activemq.jndi.ActiveMQInitialContextFactory&amp;java.naming.provider.url=failover:(tcp://localhost:61616,tcp://localhost:61617)?randomize=false&amp;transport.jms.DestinationType=queue">
                        <suspendOnFailure>
                            <initialDuration>-1</initialDuration>
                            <progressionFactor>-1</progressionFactor>
                            <maximumDuration>0</maximumDuration>
                        </suspendOnFailure>
                        <markForSuspension>
                            <retriesBeforeSuspension>0</retriesBeforeSuspension>
                        </markForSuspension>
                    </address>
                </endpoint>
            </send>
        </inSequence>
        <outSequence/>
        <faultSequence/>
    </target>
    <parameter name="transport.jms.SessionAcknowledgement">AUTO_ACKNOWLEDGE</parameter>
    <parameter name="transport.jms.Destination">$SYSTEM:destination</parameter>
    <parameter name="transport.jms.ConnectionFactoryType">firstQueue</parameter>
    <parameter name="transport.jms.ContentType">$SYSTEM:contenttype</parameter>
    <parameter name="java.naming.provider.url">$SYSTEM:jmsurl</parameter>
    <parameter name="transport.jms.SessionTransacted">false</parameter>
    <parameter name="transport.jms.ConnectionFactoryJNDIName">$SYSTEM:jmsconfac</parameter>
    <parameter name="transport.jms.UserName">$SYSTEM:jmsuname</parameter>
    <parameter name="transport.jms.Password">$SYSTEM:jmspass</parameter>
</proxy>

  4. Create a Composite Application Project with the above proxy service inside the Maven Multi Module project.

    1. Right-click the maven multi modiule project, go to New → Project, select Composite Application Project, and click Next.

    2. Be sure to select the proxy service under Dependencies as shown below. Create Composite Application Project

    3. Click Finish.

  5. Create a Kubernetes Project inside the Maven Multi Module Project.

    1. Right-click the Maven Multi Module project, go to New → Project, select Kubernetes Exporter Project, and click Next. Create Kubernetes Project

    2. In the Kubernetes Project Information dialog that opens, enter the following details:

      Parameter Description
      Kubernetes Project Name Give a unique name for the project.
      Integration Name This name will be used to identify the integration solution in the kubernetes custom resource. Let's use jms-example as the integration name for this example.
      Number of Replicas Specify the number of pods that should be created in the kubernetes cluster.
      Base Image Repository Specify the base Micro Integrator Docker image for your solution. For this example, let's use the Micro Integrator docker image from the WSO2 public docker registry: wso2/wso2mi.

      Note that the image value format should be 'docker_user_name/repository_name'.
      Base Image Tag Give a tag name for the base Docker image.
      Target Image Repository The Docker repository to which the Docker image will be pushed: 'docker_user_name/repository_name'.
      Target Image Tag Give a tag name for the Docker image.

    3. This step is only required if you already have a Docker image (in your local Docker repository) with the same name as the base image specified above.

      Info

      In this scenario, WSO2 Integration Studio will first check if there is a difference in the two images before pulling the image specified in the Base Image Repository field. If the given base image is more updated, the existing image will be overwritten by this new image. Therefore, if you are currently using an older version, or if you have custom changes in your existing image, they will be replaced.

      To avoid your existing custom/older images from being replaced, add the following property under dockerfile-maven-plugin -> executions -> execution -> configurations in the pom.xml file of your Kubernetes Exporter project. This configuration will ensure that the base image will not be pulled when a Docker image already exists with the same name.

      <pullNewerImage>false</pullNewerImage>

    4. Open the integration_cr.yaml file inside the Kubernetes project and add the environment variables as shown below. These values will be injected to the parameters defined in the proxy service.

      Tip

      Be sure to update the tcp://localhost:61616 URL in the above configuration with the actual/connecting URL that will be reachable from the Kubernetes pod.

      ---
apiVersion: "integration.wso2.com/v1alpha1"
kind: "Integration"
metadata:
  name: "jms"
spec:
  replicas: 1
  image: "Docker/image/path/to/the/JMSSenderListner"
  port: 8290
  env:
  - name: "jmsconfac"
    value: "TopicConnectionFactory"
  - name: "jmsuname"
    value: "admin"
  - name: "destination"
    value: "queue"
  - name: "jmsurl"
    value: "tcp://localhost:61616"
  - name: "jmspass"
    value: "admin"
  - name: "contenttype"
    value: "application/xml"

Finally, the created Maven Multi Module project should look as follows:

Hello World Project

Step 2: Update JMS configurations

  1. Uncomment the following two commands in the Dockerfile inside the Kubernetes project. 
    COPY Libs/*.jar $WSO2_SERVER_HOME/lib/
COPY Conf/* $WSO2_SERVER_HOME/conf/
  2. Download Apache ActiveMQ.

  3. Copy the following client libraries from the <ACTIVEMQ_HOME>/lib directory to the <MAVEN_MULTI_MODULE>/<KUBERNETES_PROJECT>/Lib directory.

    ActiveMQ 5.8.0 and above

    • activemq-broker-5.8.0.jar
    • activemq-client-5.8.0.jar
    • activemq-kahadb-store-5.8.0.jar
    • geronimo-jms_1.1_spec-1.1.1.jar
    • geronimo-j2ee-management_1.1_spec-1.0.1.jar
    • geronimo-jta_1.0.1B_spec-1.0.1.jar
    • hawtbuf-1.9.jar
    • Slf4j-api-1.6.6.jar
    • activeio-core-3.1.4.jar (available in the /lib/optional directory)

    Earlier version of ActiveMQ

    • activemq-core-5.5.1.jar
    • geronimo-j2ee-management_1.0_spec-1.0.jar
    • geronimo-jms_1.1_spec-1.1.1.jar

  4. Open the deployment.toml file in your Kubernetes project and add the following content to enable the JMS sender and listener:

    Tip

    Be sure to update the tcp://localhost:61616 URL in the above configuration with the actual/connecting URL that will be reachable from the Kubernetes pod.

    [server]
hostname = "localhost"

[keystore.tls]
file_name = "wso2carbon.jks"
password = "wso2carbon"
alias = "wso2carbon"
key_password = "wso2carbon"

[truststore]
file_name = "client-truststore.jks"
password = "wso2carbon"
alias = "symmetric.key.value"
algorithm = "AES"

[[transport.jms.listener]]
name = "default"
parameter.initial_naming_factory = "org.apache.activemq.jndi.ActiveMQInitialContextFactory"
parameter.provider_url = "tcp://localhost:61616"
parameter.connection_factory_name = "QueueConnectionFactory"
parameter.connection_factory_type = "queue"

[[custom_transport.sender]]
protocol = "jms"
class="org.apache.axis2.transport.jms.JMSSender"

Step 3: Package and build the solution

You need to build a Docker image of the integration solution and push it to your Docker registry.

  1. Start the Docker daemon in the host machine.
  2. Open the pom.xml file in the Kubernetes project and ensure that the composite application is selected under Dependencies.
  3. Leave the Automatically deploy configurations check box selected. This ensures that deployment configurations are automatically deployed to the base image.

  4. Click Build and Push. In the dialog that opens, enter the credentials of your Docker registry to which the image should be pushed.

    docker registry credentials

    Info

    Alternatively, you can build the Docker image and push it to the Docker registry as follows:

    1. Navigate to the Maven Multi Module project and run the following command to build the project. It will create a docker image with the provided target repository and tag once the build is successfull. 
      mvn clean install -Dmaven.test.skip=true
    2. Navigate to the Kubernetes project inside the MavenParentProject and run the following command to push the docker image to the remote docker registry. 
      mvn dockerfile:push -Ddockerfile.username={username} -Ddockerfile.password={password}

  5. Run the docker image ls command to verify that the Docker image is created.

Step 4: Deploy the solution in K8s

Info

Before you begin, be sure that the system requrements are in place, and that the EI Kubernetes Operator is installed.

Follow the steps given below:

  1. Open the integration_cr.yaml file from the Kubernetes project in WSO2 Integration Studio.
  2. See that the integration details of the jms-example solution is updated.
  3. Open a terminal, navigate to the location of your integration_cr.yaml file, and execute the following command to deploy the integration solution into the Kubernetes cluster: 
    kubectl apply -f integration_cr.yaml

When the integration is successfully deployed, it should create the hello-world integration, jms-example-deployment, jms-example-service, and ei-operator-ingress as follows:

Tip

The ei-operator-ingress will not be created if you have disabled the ingress controller.

kubectl get integration

NAME          STATUS    SERVICE-NAME    AGE
jms-example   Running   hello-service   2m

kubectl get deployment

NAME                     READY   UP-TO-DATE   AVAILABLE   AGE
jms-example-deployment   1/1     1            1           2m

kubectl get services
NAME                     TYPE        CLUSTER-IP       EXTERNAL-IP   PORT(S)       AGE
jms-example-service      ClusterIP   10.101.107.154   <none>        8290/TCP      2m
kubernetes               ClusterIP   10.96.0.1        <none>        443/TCP       2d
k8s-ei-operator          ClusterIP   10.98.78.238     <none>        443/TCP       1d

kubectl get ingress
NAME                  HOSTS     ADDRESS     PORTS     AGE
ei-operator-ingress   wso2ei    10.0.2.15   80, 443   2m

This will create a new queue called queue in ActiveMQ.

Step 5: Test the deployment

Send a message to this queue. The proxy service you added in step 3 above will listen to this message and send that message to a new queue called secondQueue.

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