Configuring the number of replicas

To configure the number of replicas for Che operands using Kubernetes HorizontalPodAutoscaler (HPA), you can define an HPA resource for deployment. The HPA dynamically adjusts the number of replicas based on specified metrics.

Procedure

  1. Create an HPA resource for a deployment, specifying the target metrics and desired replica count.

    apiVersion: autoscaling/v2
kind: HorizontalPodAutoscaler
metadata:
  name: scaler
  namespace: eclipse-che
spec:
  scaleTargetRef:
    apiVersion: apps/v1
    kind: Deployment
    name: <deployment_name> (1)
  ...
    1 The <deployment_name> corresponds to the one following deployments:

    • che

    • che-gateway

    • che-dashboard

    • plugin-registry

    • devfile-registry
Example 1. Create a HorizontalPodAutoscaler for che deployment:
apiVersion: autoscaling/v2
kind: HorizontalPodAutoscaler
metadata:
  name: che-scaler
  namespace: eclipse-che
spec:
  scaleTargetRef:
    apiVersion: apps/v1
    kind: Deployment
    name: che
  minReplicas: 2
  maxReplicas: 5
  metrics:
    - type: Resource
      resource:
        name: cpu
        target:
          type: Utilization
          averageUtilization: 75

In this example, the HPA is targeting the Deployment named che, with a minimum of 2 replicas, a maximum of 5 replicas and scaling based on CPU utilization.

Additional resources