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Better autoscaler trait

Better autoscaler trait is used to autoscale components with replicable workloads. This is implemented by the HarmonyCloud and it is an enhanced version of hpa.

Installation

To use the better-auto-scaler trait, you must install the better-autoscaler-controller.

Supported workload types

  • core.oam.dev/v1alpha1.Server
  • core.oam.dev/v1alpha1.Task
  • core.oam.dev/v1alpha1.Worker
  • harmonycloud.cn/v1alpha1.MysqlCluster

Properties

Name Description Allowable values Required Default
minimum Lower threshold of replicas to run. integer 1
maximum Higher threshold of replicas to run. integer. Cannot be less than minimum value. 10
memory-up Memory consumption threshold (as percent) that will cause a scale-up event. integer
memory-down Memory consumption threshold (as percent) that will cause a scale-down event. integer
cpu-up CPU consumption threshold (as percent) that will cause a scale-up event. integer
cpu-down CPU consumption threshold (as percent) that will cause a scale-down event. integer

Usage

This is usage of an better-auto-scaler trait. You would attach this to a component within the application configuration:

# Usage better-auto-scaler trait entry
- name: better-auto-scaler
  properties:
    maximum : 6
    minimum : 2
    cpu-up : 50
    cpu-down : 20
    memory-up : 50
    memory-down: 20

Example

$ kubectl apply -f component-schematics.yaml 
componentschematic.core.oam.dev/hc-hpa-example created
$ kubectl apply -f application-configurations.yaml 
applicationconfiguration.core.oam.dev/better-autoscaler-example created
$
$ kubectl get deploy,hchpa,pod
NAME                                     READY   UP-TO-DATE   AVAILABLE   AGE
deployment.apps/better-autoscaled-demo   2/2     2            2           2m50s

NAME                                                             AGE
horizontalpodautoscaler.harmonycloud.cn/better-autoscaled-demo   2m49s

NAME                                          READY   STATUS    RESTARTS   AGE
pod/better-autoscaled-demo-595dbb46cf-29mzt   1/1     Running   0          2m51s
pod/better-autoscaled-demo-595dbb46cf-jpdj8   1/1     Running   0          2m35s