Kubernetes

Deploying RestBI in Kubernetes

Kubernetes is a powerful orchestration tool for managing containerized applications at scale. Below is an example of how to deploy RestBI using Kubernetes.

Create a Kubernetes Deployment

Create a restbi-deployment.yaml file with the following content:

apiVersion: apps/v1
kind: Deployment
metadata:
  name: restbi-deployment
spec:
  replicas: 2
  selector:
    matchLabels:
      app: restbi
  template:
    metadata:
      labels:
        app: restbi
    spec:
      containers:
      - name: restbi
        image: restbi/restbi-server:latest
        ports:
        - containerPort: 3000
        env:
        - name: DB_HOST
          value: "postgres-service"
        - name: DB_PORT
          value: "5432"
        - name: DB_USER
          value: "youruser"
        - name: DB_PASSWORD
          value: "yourpassword"
        - name: DB_NAME
          value: "chinook"
        - name: CORS_WHITELIST
          value: "http://example.com,http://anotherdomain.com"
        volumeMounts:
        - name: custom-functions
          mountPath: /app/custom-functions
      volumes:
      - name: custom-functions
        hostPath:
          path: /path/to/custom/functions

---
apiVersion: v1
kind: Service
metadata:
  name: restbi-service
spec:
  selector:
    app: restbi
  ports:
    - protocol: TCP
      port: 80
      targetPort: 3000
  type: LoadBalancer

The restbi-deployment.yaml file sets up the RestBI server within a Kubernetes cluster. Here's what it does:

Deployment:

• Replicas: Runs two instances (pods) of the RestBI server for redundancy.

• Container:

  • Image: Uses restbi/restbi-server:latest.

  • Ports: Exposes port 3000.

  • Environment Variables:

    • DB_HOST: Points to the PostgreSQL service (postgres-service).

    • DB_PORT: Set to 5432.

    • DB_USER, DB_PASSWORD, DB_NAME: Database credentials.

    • CORS_WHITELIST: Specifies allowed domains for CORS.

  • Volume Mount: Mounts custom functions from the host to /app/custom-functions.

Service:

• Type: LoadBalancer, making RestBI accessible externally.

• Ports: Maps incoming traffic on port 80 to port 3000 on the pods.

How It Works:

• PostgreSQL Connection: RestBI connects to a PostgreSQL service (postgres-service) defined elsewhere in Kubernetes.

• High Availability: Two replicas ensure redundancy and basic load balancing.

• Customization: Users can add custom functions via a mounted volume.

• External Access: The LoadBalancer exposes RestBI to the outside world.

Apply the Deployments

To deploy the RestBI server on Kubernetes, run the following commands:

kubectl apply -f restbi-deployment.yaml