What is Prometheus :

Prometheus is an open source application monitoring software which is used to achieve the continuous monitoring of our application state .

Let's set up a sample monitoring in our k8s cluster with Prometheus and Grafana :

• Instead of creating all the configuration files we are going to use Prometheus Helm charts

• And Internally Kubernetes operators are going to manage all the configurations .

• Install the Prometheus Helm Chart :
  

$helm install --name prometheus stable/prometheus

• Have a look at some default files that we are going to need in the future using these commands .

$kubectl get pod

$kubectl get service

$kubectl get configmap

$kubectl get cidr

$kuctktl get statefulsets

• Two things we need to take care of when we add a new configuration to our cluster .

1. About the configuration settings
2. About the Alert manager

• Access the grafana dashboard by using the port-forward command .
• Check in which port Grafana dashboard is running

$kubectl logs prometheus-grafana-5c5885d488-b9mlj

$ kubectl port-forward -n prometheus prometheus-grafana-5c5885d488-b9mlj 3000

• Then open the browser and visit to

http://localhost:3000

• On the login page, enter admin for username and password.