Install Prometheus and Grafana on Kubernetes cluster along with data source and persistent storage.

helm-prometheus-grafana.md

Installing Prometheus and Grafana

Add and update repos to fetch charts

helm repo add prometheus-community https://prometheus-community.github.io/helm-charts
helm repo add grafana https://grafana.github.io/helm-charts
helm repo update

Create monitoring namespace

kubectl create namespace monitoring

Install Prometheus service and define storage

helm install prometheus prometheus-community/prometheus \
--namespace monitoring \
--set alertmanager.persistentVolume.storageClass="standard" \
--set server.persistentVolume.storageClass="standard"

Create grafana.yaml

mkdir ${HOME}/environment/grafana

cat << EoF > ${HOME}/environment/grafana/grafana.yaml
datasources:
  datasources.yaml:
    apiVersion: 1
    datasources:
    - name: Prometheus
      type: prometheus
      url: http://prometheus-server.monitoring.svc.cluster.local
      access: proxy
      isDefault: true
EoF

Install grafana and allocate storage and user pass

helm install grafana grafana/grafana \
    --namespace monitoring \
    --set persistence.storageClassName="standard" \
    --set persistence.enabled=true \
    --set adminPassword='subje' \
    --values ${HOME}/Documents/monitoring/grafana.yaml \
    --set service.type=LoadBalancer

Import a predefined template within Grafana:

For example template ID: 6417 https://grafana.com/grafana/dashboards/6417

I was installing Prometheus and Grafana on a GKE cluster and faced a problem while following these steps.
At all the places where we have --set persistence.storageClassName="default", it should be --set persistence.storageClassName="standard". Because there are no default storage classes in GKE but there are standard ones.

@prashantkalwani1 indeed if you want to point out to default it should either be set to standard or left out as an empty string to select the default which is standard. Thanks for bringing this up, I updated it.