Another Autoscaler
Another Autoscaler is a Kubernetes controller that automatically starts, stops, or restarts pods from a deployment at a specified time using a cron syntax.
Another Autoscaler read the annotation of each deployment and performs an increase or decrease in the number of replicas.
The date and time must be in UTC.
The restart feature execute a rollout restart deployment.
Use cases
- Cost savings by reducing the number of replicas after working hours or weekends.
- GPU deployments stop them after working hours (this is my case in my current job).
- Another Autoscaler is a perfect combination with Cluster Autoscaler.
Install
# Deploy Another Autoscaler into Kubernetes on default namespace
kubectl apply -f https://raw.githubusercontent.com/dignajar/another-autoscaler/master/kubernetes/full.yaml
Annotations
Stop pods at 6pm every day:
another-autoscaler.io/stop-time: "00 18 * * *"
Start pods at 1pm every day:
another-autoscaler.io/start-time: "00 13 * * *"
Start 3 pods at 2:30pm every day:
another-autoscaler.io/start-time: "30 14 * * *"
another-autoscaler.io/start-replicas: "3"
Restart pods at 9:15am every day:
another-autoscaler.io/restart-time: "15 09 * * *"
Restart pods at 2:30am, only on Saturday and Sunday:
another-autoscaler.io/restart-time: "00 02 * * 0,6"
Example: How to start pods at 2pm and stop them at 3pm every day
The following example start 5 replicas in total at 2pm and stop 4 of them at 3pm every day, the deployment start with 0 replicas.
The start-replicas is not incremental, the value is the number of replicas will be setup by Another Autoscaler at the defined time by start-time.
The date and time must be in UTC.
apiVersion: apps/v1
kind: Deployment
metadata:
name: nginx
labels:
app: nginx
annotations:
another-autoscaler.io/start-time: "00 14 * * *"
another-autoscaler.io/start-replicas: "5"
another-autoscaler.io/stop-time: "00 15 * * *"
another-autoscaler.io/stop-replicas: "1"
spec:
replicas: 0
selector:
matchLabels:
app: nginx
template:
metadata:
labels:
app: nginx
spec:
containers:
- name: nginx
image: nginx:latest
ports:
- containerPort: 80
GitOps / FluxCD
To avoid conflicts with Flux and Another Autoscaler, you can remove the field spec.replicas from your deployment manifest and leave Another Autoscaler to manage the number of replicas.
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