Overview:

Monitoring is crucial for understanding the health and performance of your Kubernetes cluster. In this lesson, you will set up and use tools like the Metrics Server and Prometheus.

Metrics Server:

1. What is Metrics Server?

   • A lightweight aggregator that provides resource usage data (CPU, memory) for Pods and Nodes.

2. Install Metrics Server:

   kubectl apply -f https://github.com/kubernetes-sigs/metrics-server/releases/latest/download/components.yaml

3. Verify Installation:

   kubectl top nodes
   kubectl top pods

Prometheus:

1. What is Prometheus?

   • A powerful monitoring and alerting toolkit commonly used with Kubernetes.

2. Deploy Prometheus:

   • Use Helm to install Prometheus:

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

3. Access Prometheus Dashboard:

   • Forward the Prometheus server port:

     kubectl port-forward deploy/prometheus-server 9090

   • Open http://localhost:9090 in your browser.

Activity:

Install the Metrics Server and Prometheus in your cluster. Use kubectl top and Prometheus queries to monitor resource usage.