OpenEBS Local Storage Solution

Purpose

This guide illustrates the procedure to deploy and configure OpenEBS for Kubernetes (RKE2 or K3s). OpenEBS can be used as local storage solution for the Expertflow CX solution.

As mentioned on OpenEBS site (https://openebs.io/docs), the the top reasons towards using OpenEBS as:

OpenEBS provides consistency across all Kubernetes distributions - On-premise and Cloud.
OpenEBS with Kubernetes increases Developer and Platform SRE Productivity.
OpenEBS is Easy to use compared to other solutions, for e.g. trivial to install & enabling entirely dynamic provisioning.
OpenEBS has Excellent Community Support.
OpenEBS is completely Open Source and Free.

Intended Audience

This document is intended for IT operations personnel and system administrators who want to deploy Expertflow CX on local storage. Familiarity with computer network component networking and storage is preferable.

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Pre-Requisites for OpenEBS

OpenEBS (Open Elastic Block Storage) an open source containerized storage solution. We will be deploying OpenEBS local Persistent Volume backed by Hostpath.

Setup the directory on the nodes where Local PV Hostpaths will be created. This directory will be referred to as BasePath. The default location is /var/openebs/local.

BasePath can be any of the following:

A directory on root disk (or os disk). (Example: /var/openebs/local).
In the case of cloud or virtual instances, a mounted directory created from attaching an external cloud volume or virtual disk. (Example, in GKE, a Local SSD can be used which will be available at /mnt/disk/ssd1.)

Installation Options

The installation can be done either using kubectl or helm

1. Install Using kubectl

To install using kubectl, run the following command:

BASH

kubectl apply -f https://openebs.github.io/charts/openebs-operator.yaml

OR

1. Install Using helm

Installation can also be done via helm. Run the following command

BASH

helm repo add openebs https://openebs.github.io/charts
helm repo update
helm install --namespace openebs --name openebs openebs/openebs

Finalization Steps

1. Once installation is complete, verify the pods are up and running using the following command:

BASH

 helm install  openebs --namespace openebs openebs/openebs --create-namespace

2. See the default storage class is created with base path

BASH

kubectl get sc

3. Make the storage class as default, replace <name> with your storage class name from above command.

BASH

kubectl patch storageclass openebs-hostpath -p '{"metadata": {"annotations":{"storageclass.kubernetes.io/is-default-class":"true"}}}'