deveshs23 / dynamic-pv-scaler

A golang based Kubernetes application which can scale volume dynamically

Dynamic PV(Persistent Volume) Scaler

A golang based Kubernetes application which has been created to overcome the scaling issue of Persistent Volume in Kubernetes. This can scale the Persistent Volume on the basis of threshold which you have set.

Getting Started

Architecture

Pre-requisites

Sorry none of these pre-requisites can be compromised. So you guys have to meet these requirements 🙂

• Kubernetes cluster version should be greater than 1.11+
• Prometheus should be have the information of Persistent Volume
• In storageclass, allowVolumeExpansion flag should be true

Example:-

---
apiVersion: storage.k8s.io/v1
kind: StorageClass
metadata:
  name: standard
provisioner: kubernetes.io/aws-ebs
parameters:
  type: gp2
reclaimPolicy: Retain
allowVolumeExpansion: true # This should be true for every storage class
mountOptions:
  - debug
volumeBindingMode: Immediate

That's it

Configuration

We are using helm to maintain the deployment and release in Kubernetes cluster. Hit Me. But for configuration part this application accepts a yaml file .config.yaml:

---
- namespace: database
  scale_percentage: 50
  threshold_percentage: 80
  pvc_name: data-mysql-0

Configuration file overview:-

Field	Default Value	Possible Values	Description
namespace	-	Any valid k8s namespace	Persistent Volume's namespace which needs to be watched
scale_percentage	-	Any integer	How much percent you want to scale your pv
threshold_percentage	-	Any integer	The target percentage after which you want to scale the pv
pvc_name	-	Any valid k8s pvc name	Name of the pvc which you want to scale

Make sure you have updated the configuration in values.yaml.

Installation

Simply use the helm chart to install it on your flavor of Kubernetes.

# Deploy the PV Scaler
helm upgrade dynamic-pv-scaler ./deploy/helm --install --namespace dynamic-pv-scaler

Verify the installation

helm test dynamic-pv-scaler --namespace dynamic-pv-scaler
kubectl get pods -n dynamic-pv-scaler

Logging

The application's logging interface is designed to print logs in JSON stdout. Example logs:-

Development

Please see our development documentation for details.

Release

Please see our release documentation for details.

Contact

If you have any suggestion or query. Contact us at

[email protected]