K8s Prometheus on Windows (AKS)

Create a Kubernetes (K8s) cluster on Azure (AKS).
1. make sure it has System & User Linux Node to provision necessary Prometheus-related pods

Install helm on the cluster.

connect to the k8s cluster.

First, we will taint the Windows node so that no Linux pods are provisioned on this node
1. CODE
```
kubectl taint nodes akswinbil000000 os=windows:NoSchedule
```

add and update Prometheus community helm reposistory

CODE

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

Install Prometheus using Helm only on Linux nodes

CODE

helm install prometheus prometheus-community/prometheus \\n  --namespace monitoring \\n  --create-namespace \\n  --set nodeSelector."kubernetes\.io/os"=linux

After this you will see Prometheus pods running successfully on Linux nodes only

b. Install Windows Exporter on the k8s cluster to monitor Windows nodes

** This image is for Windows 2022 Datacenter: http://ghcr.io/prometheus-community/windows-exporter:0.29.0-ltsc2022

CODE

apiVersion: apps/v1
kind: DaemonSet
metadata:
  name: windows-exporter
  namespace: monitoring
spec:
  selector:
    matchLabels:
      app: windows-exporter
  template:
    metadata:
      labels:
        app: windows-exporter
    spec:
      nodeSelector:
        kubernetes.io/os: windows
      tolerations:
      - key: "os"
        operator: "Equal"
        value: "windows"
        effect: "NoSchedule"
      hostNetwork: true
      securityContext:
        windowsOptions:
          hostProcess: true
          runAsUserName: "NT AUTHORITY\\System"
      containers:
      - name: windows-exporter
        image: ghcr.io/prometheus-community/windows-exporter:0.29.0-ltsc2022
        ports:
        - containerPort: 9182
          hostPort: 9182
          name: http
        args:
        - --collectors.enabled=cpu,cs,container,logical_disk,memory,net,os

c. Install windows-exporter service

CODE

apiVersion: v1
kind: Service
metadata:
  name: windows-exporter-svc
  namespace: monitoring
spec:
  selector:
    app: windows-exporter  # Must match labels in your DaemonSet pods
  ports:
    - name: http
      port: 9182
      targetPort: 9182
  type: ClusterIP

c. Update the Prometheus config map to scrape Windows-exporter metrics. Under the scrape config, add the following configuration.

CODE

    scrape_configs:
    - job_name: 'windows_node'
      static_configs:
      - targets:
        - 'windows-exporter-svc.monitoring.svc.cluster.local:9182'

Access the Prometheus UI to see Windows metrics like: