chore(docs): instruction guide on installing WordPress using OpenEBS NFS Volumes (#105)

* chore(docs): instruction guide on installing WordPress using OpenEBS NFS Volumes

Signed-off-by: mayank <[email protected]>

Author: mynktl

docs/workload/wordpress.md

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+# Deploy WordPress with NFS Persistent Volumes
+This document explains how to deploy a WordPress site using OpenEBS NFS Volume. Since OpenEBS NFS volume supports RWX(ReadWriteMay) storage mode, WordPress deployment using OpenEBS NFS volumes is highly scalable.
+
+## Prerequisites
+Kubernetes cluster with OpenEBS NFS Provisioner installed. Refer [QuickStart guide on How to install OpenEBS NFS Provisioner](https://github.com/openebs/dynamic-nfs-provisioner/blob/develop/docs/intro.md#quickstart)
+
+## Deploying WordPress
+We will use the Helm package to install WordPress in our kubernetes cluster. If you don't have Helm installed, follow the [Installing Helm](https://helm.sh/docs/intro/install/) guide for installation.
+
+### Adding Help repo for WordPress
+Use the below command to add helm repo for WordPress.
+
+```
+helm repo add bitnami https://charts.bitnami.com/bitnami
+```
+
+Once repo has been added successfully, update helm repo using the following command:
+
+```
+helm repo update
+```
+
+### Installing WordPress
+Once the helm repo is added, you can install WordPress using `helm install` as mentioned below. In this command, we are using Storageclass `openebs-rwx` created using [QuickStart guide](https://github.com/openebs/dynamic-nfs-provisioner/blob/develop/docs/intro.md#quickstart). If you have created a different OpenEBS NFS Storageclass then you need to update the value of `--set persistence.storageClass`.
+You can also configure [the other parameters through the `--set` argument](https://github.com/bitnami/charts/tree/master/bitnami/wordpress#parameters)
+
+```
+helm install my-release -n wordpress --create-namespace \
+       --set wordpressUsername=admin \
+       --set wordpressPassword=password \
+       --set mariadb.auth.rootPassword=secretpassword \
+       --set persistence.storageClass=openebs-rwx \
+       --set persistence.accessModes={ReadWriteMany} \
+       --set volumePermissions.enabled=true \
+       --set autoscaling.enabled=true \
+       --set autoscaling.minReplicas=2 \
+       --set autoscaling.maxReplicas=6 \
+       --set autoscaling.targetCPU=80 \
+        bitnami/wordpress
+```
+
+The above will create two WordPress application pods with RWX persistent volume. We are using `my-release` as a release name for the WordPress installation. You can replace `my-release` with a different name also.
+
+You can check the generated pods using the command `kubectl get pods -n wordpress`.
+```
+$ kubectl get pods -n wordpress
+NAME                                   READY   STATUS    RESTARTS   AGE
+my-release-mariadb-0                   1/1     Running   0          3m14s
+my-release-wordpress-79969f558-lqs56   1/1     Running   0          2m59s
+my-release-wordpress-79969f558-qjblc   1/1     Running   0          3m14s
+```
+
+To check PVC/PV created for WordPress pods,
+```
+$ kubectl get pvc -n wordpress
+NAME                        STATUS   VOLUME                                     CAPACITY   ACCESS MODES   STORAGECLASS       AGE
+data-my-release-mariadb-0   Bound    pvc-9dfec460-fc8a-4033-b26c-a28637dcaa3e   8Gi        RWO            openebs-hostpath   3m33s
+my-release-wordpress        Bound    pvc-0234ee9c-befc-4824-8230-3dd6779214cb   10Gi       RWX            openebs-rwx        3m33s
+```
+
+You can see PVC `my-release-wordpress` is using Storageclass `openebs-rwx` which is having `RWX` access mode.
+
+## Clean up WordPress installation
+To uninstall WordPress, run the below command:
+
+```
+helm uninstall my-release -n wordpress
+```
+
+
+To delete the `wordpress` namespace, run
+```
+kubectl delete ns wordpress
+```