L17-Prometheus_and_Grafana_setup.md

Prometheus setup

pre-requisites

1. Kubernetes cluster
2. helm

Setup Prometheus

1. Create a dedicated namespace for prometheus

   kubectl create namespace monitoring

2. Add Prometheus helm chart repository

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

3. Update the helm chart repository

   helm repo update
   helm repo list

4. Install the prometheus

    helm install prometheus prometheus-community/kube-prometheus-stack --namespace monitoring

5. Above helm create all services as ClusterIP. To access Prometheus out side of the cluster, we should change the service type load balancer

   kubectl edit svc prometheus-kube-prometheus-prometheus -n monitoring
   

6. Loginto Prometheus dashboard to monitor application https://ELB:9090

7. Check for node_load15 executor to check cluster monitoring

8. We check similar graphs in the Grafana dashboard itself. for that, we should change the service type of Grafana to LoadBalancer

   kubectl edit svc prometheus-grafana

9. To login to Grafana account, use the below username and password

   username: admin
   password: prom-operator

10. Here we should check for "Node Exporter/USE method/Node" and "Node Exporter/USE method/Cluster" USE - Utilization, Saturation, Errors

11. Even we can check the behavior of each pod, node, and cluster