cron-hpa
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Cron Horizontal Pod Autoscaler(CronHPA)
CronHPA
Cron Horizontal Pod Autoscaler(CronHPA) enables us to auto scale workloads(those support scale
subresource, e.g. deployment, statefulset) periodically using crontab scheme.
CronHPA
example:
apiVersion: extensions.tkestack.io/v1
kind: CronHPA
metadata:
name: example-cron-hpa
spec:
scaleTargetRef:
apiVersion: apps/v1
kind: Deployment
name: demo-deployment
crons:
- schedule: "0 23 * * 5" // Set replicas to 60 every Friday 23:00
targetReplicas: 60
- schedule: "0 23 * * 7" // Set replicas to 30 every Sunday 23:00
targetReplicas: 30
More design ideas could be found at design.md.
Build
$ make build
or
$ go build -o bin/cron-hpa-controller .
Run
# assumes you have a working kubeconfig, not required if operating in-cluster
# It will create CRD `CronHPA` by default.
$ bin/cron-hpa-controller --master=127.0.0.1:8080 --v=5 --stderrthreshold=0 // Assume 127.0.0.1:8080 is k8s master ip:port
or
$ bin/cron-hpa-controller --kubeconfig=$HOME/.kube/config --v=5 --stderrthreshold=0
# create a custom resource of type cron-hpa
$ kubectl create -f artifacts/examples/example-cron-hpa.yaml
# check pods created through the custom resource
$ kubectl get cronhpa
Cleanup
You can clean up the created CustomResourceDefinition with:
$ kubectl delete crd cronhpas.extensions.tkestack.io