scale-operator

Kubernetes time based scale operator

Commands

1. Create project

kubebuilder init --domain scaler.cloudsteak.com --owner "CloudSteak" --repo github.com/cloudsteak/scale-operator.git

2. Create API

kubebuilder create api --kind Scaler --version v1alpha1 --group api

3. Generate code containing DeepCopy, DeepCopyInto, and DeepCopyObject method implementations.

make generate

4. Create manifests (CRD, RBAC and Controller)

make manifests

5. Develop your code

6. Install CRDs

make install

7. Create deployment

kubectl create deploy nginx --image=nginx

8. Configure scaler

nano config/samples/api_v1alpha1_scaler.yaml

spec:
  start: 5 # UTC time
  end: 11 # UTC time
  replicas: 2
  deployments:
    - name: nginx
      namespace: nginx

9. Create scaler

kubectl apply -f config/samples/api_v1alpha1_scaler.yaml

10. Run the controller

make run

11. Check output

** Scale up

2024-07-08T07:41:02+02:00       INFO    --- Scaling up deployments      {"controller": "scaler", "controllerGroup": "api.scaler.cloudsteak.com", "controllerKind": "Scaler", "Scaler": {"name":"scaler-sample","namespace":"default"}, "namespace": "default", "name": "scaler-sample", "reconcileID": "d113f2c7-e8d2-4d9a-a3f9-3b51134e7dd1"}
2024-07-08T07:41:02+02:00       INFO    Scaling Deployment      {"name": "nginx", "namespace": "default", "replicas_to": 2, "replicas_from": 1}

** Scale down

2024-07-08T16:40:02+02:00       INFO    --- Scaling down deployments    {"controller": "scaler", "controllerGroup": "api.scaler.cloudsteak.com", "controllerKind": "Scaler", "Scaler": {"name":"scaler-sample","namespace":"default"}, "namespace": "default", "name": "scaler-sample", "reconcileID": "c0668843-f7ee-4c7a-99d6-7cf6e5fbeb0f"}
2024-07-08T16:40:02+02:00       INFO    Scaling Deployment      {"name": "nginx", "namespace": "default", "replicas_to": 1, "replicas_from": 2}