To install Prometheus without persistent volume storage, you can follow these steps. This setup is suitable for testing or small-scale deployments where data persistence is not a requirement.

Step 1: Create Namespace (Optional)

kubectl create namespace prometheus

Step 2: Create ConfigMap for Prometheus Configuration

Create a ConfigMap to store the Prometheus configuration:

apiVersion: v1
kind: ConfigMap
metadata:
  name: prometheus-config
data:
  prometheus.yml: |
    global:
      scrape_interval: 15s

    scrape_configs:
      - job_name: 'prometheus'
        static_configs:
          - targets: ['localhost:9090']

Apply the ConfigMap:

kubectl apply -f prometheus-config.yaml

Step 3: Deploy Prometheus

Use the official Prometheus Helm chart to deploy Prometheus:

helm repo add prometheus-community https://prometheus-community.github.io/helm-charts
helm install prometheus prometheus-community/prometheus --namespace prometheus --set alertmanager.persistentVolume.enabled=false --set server.persistentVolume.enabled=false --set pushgateway.persistentVolume.enabled=false --set alertmanager.enabled=false --set server.service.type=LoadBalancer --set server.service.port=80 --set server.service.nodePort=30900 --set server.serviceMonitor.enabled=true --set server.serviceMonitor.namespace=monitoring --set server.serviceMonitor.selector.matchLabels.release=prometheus --set server.serviceMonitor.selector.matchLabels.app=prometheus

This command installs Prometheus using the Helm chart from the Prometheus community repository. It disables persistent volume storage for Prometheus, Alertmanager, and Pushgateway components. It also configures Prometheus to expose a NodePort service on port 30900.

Step 4: Verify Installation

Check if Prometheus pods are running:

kubectl get pods -n prometheus

Check if Prometheus service is created and note the external IP:

kubectl get svc -n prometheus

Access Prometheus Web UI using the external IP and NodePort:

http://<EXTERNAL_IP>:<NODE_PORT>

Step 5: Cleanup (Optional)

If you want to uninstall Prometheus:

helm uninstall prometheus -n prometheus
kubectl delete namespace prometheus

This setup provides a basic installation of Prometheus without persistent volume storage. Adjust configurations as needed for your specific use case.

Grafana Install using Helm

Add helm repo

helm repo add grafanahttps://grafana.github.io/helm-charts

Update helm repo

helm repo update

Install helm

helm install grafana grafana/grafana

Expose Grafana Service

Exposes a service named "grafana" as a NodePort service on a dynamically allocated port, targeting port 3000 of the Grafana pods. However, there's a small mistake in the syntax. Here's the corrected version:

kubectl expose service grafana --type=NodePort --target-port=3000 --name=grafana