Node.js Application with Prometheus Monitoring

This repository contains a Node.js application that is monitored using Prometheus. The setup includes a Helm chart for deploying the application that includes a ServiceMonitor for Prometheus to scrape metrics from the application.

Prerequisites

Kubernetes cluster
Helm installed

Prometheus Stack

helm repo add prometheus-community https://prometheus-community.github.io/helm-charts
helm repo update
helm install prometheus-stack prometheus-community/kube-prometheus-stack --namespace monitoring --create-namespace

Application

Build

docker build -t <your-repository>:latest .
docker push <your-repository>

Deploy

helm dep up helm/
helm install --namespace nodejs-prometheus nodejs-prometheus helm/ --set image.repository=<your-repository> --create-namespace

Port-forward your application

kubectl port-forward svc/nodejs-prometheus-nodejs-prometheus 3001:3000 -n nodejs-prometheus

Generate some traffic

for i in {1..100}; do
  curl http://localhost:3001
done

Open your web browser and navigate to http://localhost:3001/metrics.

Verify that your custom metrics are listed:

# HELP node_request_operations_total The total number of processed requests
# TYPE node_request_operations_total counter
node_request_operations_total 210

# HELP node_request_duration_seconds Histogram of request durations in seconds
# TYPE node_request_duration_seconds histogram
node_request_duration_seconds_bucket{le="0.1"} 210
node_request_duration_seconds_bucket{le="0.5"} 210
node_request_duration_seconds_bucket{le="1"} 210
node_request_duration_seconds_bucket{le="1.5"} 210
node_request_duration_seconds_bucket{le="2"} 210
node_request_duration_seconds_bucket{le="2.5"} 210
node_request_duration_seconds_bucket{le="3"} 210
node_request_duration_seconds_bucket{le="+Inf"} 210
node_request_duration_seconds_sum 0.09237869700000005
node_request_duration_seconds_count 210

Check Prometheus has picked up our application

Port-forward Prometheus server

kubectl port-forward svc/prometheus-kube-prometheus-prometheus 9090:9090 -n monitoring

Open your web browser and navigate to http://localhost:9090/targets.

Verify that nodejs-prometheus-servicemonitor is listed and up and running.

Grafana

Port-Forward Grafana

kubectl port-forward svc/prometheus-stack-grafana 3000:80 -n monitoring

Login to Grafana

Open your web browser and navigate to http://localhost:3000.
Login with the default credentials admin/prom-operator.
Go to Dashboards -> New -> Import.
Upload dashboard JSON file using provided example-dashboard.json.
The result should be similar to provided example-dashboard.jpeg.

AlexOQ/nodejs-prometheus