Scale down Kubernetes deployments after work hours
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README.md

Deploy Kube-downscaler using Helm chart

This directory contains tutorial to deploy Kube-downscaler and manage uptime of sample Flask applications in different time zones.

Configuring your Deployment to downscale

Please add below annotations based on timezone your deployment should run:

metadata:
  annotations:
    downscaler/uptime: "Mon-Fri 07:00-19:00 US/Eastern"

Note: For more configuration details please, refer here.

Architecture

The diagram below depicts how a Kube-downscaler agent control applications. Alt text

Quick Start

Below are instructions to quickly install and configure Kube-downscaler.

Installing Kube-downscaler

  1. Make sure connected to right cluster:
kubectl config current-context
  1. Set right environment depending on cluster:
export KDS_ENV='[minikube | testing | staging | production]'
  1. Before deploy make sure to update values.yaml in Kube-downscaler chart depending on your cluster support for RBAC:
rbac:
  create: false

Note: In case RBAC is active new service account will be created for Kube-downscaler with certain privileges, otherwise 'default' one will be used.

  1. Deploy Kube-downscaler:
helm install . --values "config/${KDS_ENV}.yaml" --namespace default  --name kube-downscaler
  1. Check the deployed release status:
helm list
NAME            	REVISION	UPDATED                 	STATUS  	CHART                	APP VERSION	NAMESPACE
kube-downscaler      	1       	Tue Sep 25 02:07:58 2018	DEPLOYED	kube-downscaler-0.5.1	0.5.1      	default
  1. Check Kube-downscaler pod is up and running:
kubectl get pods
NAME                                               READY     STATUS    RESTARTS   AGE
kube-downscaler-kube-downscaler-7f58c6b5b7-rnglz   1/1       Running   0          6m
  1. Check Kubernetes event logs, to make sure of successful deployment of Kube-downscaler:
kubectl get events -w

Deploying sample applications using Kube-downscaler

In this tutorial we will show how to deploy Kube-downscaler and test with sample Flask application.

  1. Deploy Flask applications:
kubectl apply -f tutorial/flaskapp/flask_1.yaml
kubectl apply -f tutorial/flaskapp/flask_2.yaml
  1. Ensure the following Kubernetes pods are up and running: flask-v1-tutorial-* , flask-v2-tutorial-* :
kubectl get pods
NAME                                 READY     STATUS    RESTARTS   AGE
flask-v1-tutorial-6b59556b55-kd2tv   1/1       Running   0          1m
flask-v2-tutorial-575fd64689-rkf55   1/1       Running   0          1m

Note: Deployments have grace period, which means Kube-downscaler will wait 15min to take any actions after pods get started.

  1. Check Kube-downscaler pod logs:
kubectl logs -f kube-downscaler-55b9f8ffd8-5k9q4
2018-09-25 18:13:56,253 INFO: Deployment default/flask-v1-tutorial within grace period (900s), not scaling down (yet)
2018-09-25 18:13:56,253 INFO: Deployment default/flask-v2-tutorial within grace period (900s), not scaling down (yet)
2018-09-25 18:14:01,310 INFO: Scaling down Deployment default/flask-v1-tutorial from 1 to 0 replicas (uptime: Mon-FRI 07:00-19:00 US/Eastern, downtime: never)
2018-09-25 18:14:01,327 INFO: Scaling down Deployment default/flask-v2-tutorial from 1 to 0 replicas (uptime: Thu-Fri 07:00-19:00 US/Pacific, downtime: never)

Uninstalling Sample Applications

  1. To uninstall applications, run:
kubectl delete -f tutorial/flaskapp/flask_1.yaml
kubectl delete -f tutorial/flaskapp/flask_2.yaml

Acknowledgments

Thanks to Kube-downscaler project authored by Henning Jacobs.