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• JS7 can be set up for use with a Kubernetes Cluster. Using the Linux based JS7 images for Docker® containers which ship with a current Alpine base image and OpenJDK.
  • Docker® images for JS7 are publicly available from https://hub.docker.com/r/sosberlin/js7.
  • Instructions on how to run containers for JS7 components products can be found from the JS7 - Installation for Containers article series.
• Users deploy JS7 components products by creating a Kubernetes deployment object from a deployment YAML file.
  • To this purpose users have to first install and set up the Kubernetes Cluster see JS7 - How to install a Kubernetes Cluster.
  • With the Kubernetes Cluster being up and running users can use YAML deployment files to deploy JS7 componentsproducts.

Deployment Files

The YAML sample files for deployment to Kubernetes are attached to the article.

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The archive includes the following files.

Deployment of JS7

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Products: js7-deployment.yaml

apiVersion: v1
kind: Pod
metadata:
  creationTimestamp: null
  labels:
    run: js7joc
  name: js7joc
spec:
  volumes:
  - name: hibernate-config
    configMap:
        name: hibernate-config
  containers:
  - image: sosberlin/js7:joc-2-5-1
    name: js7joc
    ports:
    - containerPort: 4446
    volumeMounts:
    - name: hibernate-config
      mountPath: /var/sos-berlin.com/js7/joc/resources/joc/
  
    env:
    - name: RUN_JS_JAVA_OPTIONS
      value: "-Xmx256m"
    - name: RUN_JS_USER_ID
      value:  "0:0"
      
  - image: sosberlin/js7:controller-2-5-1
    name: js7con
    ports:
    - containerPort: 4444
    env:
    - name: RUN_JS_JAVA_OPTIONS
      value: "-Xmx256m"
    - name: RUN_JS_USER_ID
      value:  "0:0"
    - name: RUN_JS_ID
      value:  "jobscheduler"
      
  - image: sosberlin/js7:agent-2-5-1
    name: js7agent
    ports:
    - containerPort: 4445
    env:
    - name: RUN_JS_JAVA_OPTIONS
      value: "-Xmx256m"
    - name: RUN_JS_USER_ID
      value:  "0:0"

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• Each container runs a different image from the sosberlin/js7 repository and is assigned a unique port.

• Each container defines environment variables which control a number of runtime parameters for the application such as:

  • RUN_JS_JAVA_OPTIONS : see JS7 - FAQ - Which Java Options are recommended
  • RUN_JS_USER_ID: specifies the numeric User ID and Group ID - separated by a colon - of the run-time account used for the related JS7 componentproduct. A value 0:0 indicates the root account and root group, a value 1000:1000 specifies a user account with the given User ID and Group ID. For details see JS7 - Running Containers for User Accounts.
  • RUN_JS_ID: specifies the Controller ID which is a unique identifier for a Standalone Controller or Controller Cluster.

• For the js7joc container the volumeMounts element specifies the hibernate-config ConfigMap which is mounted to the /var/sos-berlin.com/js7/joc/resources/joc directory.

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1. Download the archive file: js7-kubernetes.zip. Open a console window from the directory where you downloaded the .zip archive and extract the archive.
   
   

2. Execute the below command to create a ConfigMap and to pass the hibernate.cfg.xml file to the mount directory of the container.

   Code Block
   kubectl create configmap hibernate-config --from-file=hibernate.cfg.xml

   
   
   

3. Run the js7-deployment.yaml file to create the deployment for the JS7 configuration.

   Code Block
   kubectl create -f js7-deployment.yaml

   
   
   

4. Run the js7-service.yaml file to create the service for the JS7 configuration.

   Code Block
   kubectl create -f js7-service.yaml

   
   
   

5. Once both YAML files are executed successfully, users can check the Pods' status. The following command displays Pods running in the Kubernetes Cluster.
   

   Code Block
   kubectl get pods

   
   
   

6. Once both YAML files are executed successfully, users can check the steps from the YAML file executed to create the Pod. The following command displays resources used in Kubernetes. It shows data from a single resource and from a collection of resources.
   

   Code Block
   kubectl describe pods

   
   
   

7. The following command can be executed to check the IP address and port of JS7 componentsproducts.

   Code Block
   kubectl get service

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