Deploy camunda to kubernetes on RHEL8

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I have a need to do some enhancements on a module in my project that follows business process management standard, have couple of options available(free & open-source) , camunda is one of them, so want to give a try and have some brief ideas on the usage of this out-of-box bpm solution.

Have database ready for use

I’m using postgresql database, will put DB configuration in a deployment file later, for more details on running postgresql inside a kubernetes cluster, follow below article.

Deploy PostgreSQL to Kubernetes cluster

Partial DB connection configuration I used in my deployment.yml file as below.

          - name: DB_URL
            value: jdbc:postgresql://postgres:5432/camunda
          - name: DB_USERNAME
            value: camunda                                                         
          - name: DB_PASSWORD
            value: password

Prepare kubernetes deployment config file

Once DB connection tested and ready to use, start to draft kubernetes service config file, here’s an example

---
apiVersion: v1
kind: Service
metadata:
  name: camunda
spec:
  selector:
    app: camunda
  ports:
    - protocol: TCP
      port: 8080
      nodePort: 30088
  type: NodePort

Above is a kubernetes service configuration for camunda container, using 30088 as the node port.

Next draft a deployment config

---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: camunda
spec:
  selector:
    matchLabels:
      app: camunda
  revisionHistoryLimit: 0      
  template:
    metadata:
      labels:
        app: camunda
    spec:
      containers:
        - name: camunda
          image: camunda/camunda-bpm-platform:tomcat-7.20.0
          ports:
            - containerPort: 8080
          resources:
            requests:
              memory: 1Gi
              cpu: 500m
            limits:
              memory: 4Gi
              cpu: 2            
          env:    
          - name: DB_CONN_MAXACTIVE
            value: "20"         
          - name: DB_CONN_MAXIDLE
            value: "20"
          - name: DB_CONN_MINIDLE
            value: "5"         
          - name: DB_DRIVER
            value: org.postgresql.Driver         
          - name: DB_URL
            value: jdbc:postgresql://postgres:5432/camunda
          - name: DB_USERNAME
            value: camunda                                                         
          - name: DB_PASSWORD
            value: password                                                         
          - name: WAIT_FOR
            value: postgres:5432

In this example, I used the “camunda/camunda-bpm-platform:tomcat-7.20.0” docker image, container port is set to default: 8080, allocate resources for this container and pass all environment variables that used to connect to postgres DB

Run deployment commands on kubernetes cluster

Above service and deployment config can be merged into one file, then use below command to deploy the camunda app

kubectl apply -f deployment.yaml

Check camunda pod status if everything running correctly

NAME                                      READY   STATUS    RESTARTS   AGE
camunda-788778747-wzjs7                   1/1     Running   0          54m

Verify deployment & login to camunda

The camunda instance should be able to access at: http://your-server-IP:30088, default username and password for admin is: demo/demo

Reference

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