kubernetes_cass_operator_iks_metrics.md

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default	Cass-Operator + IKS Metrics	Metrics with Cass-Operator and IKS	/kubernetes/cass-operator/iks/metrics/

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How To: Cassandra Metrics on IKS

Cassandra Cluster Metrics for kubernetes clusters uses the Metrics Collector to expose metrics to Graphana and Promethesus. In this post I am going to expose ways to install grafana and promethesus via kubernetes. I am also going to go into detail showing how to install grafana and prometheus using operators and the Cass-Operator Metrics Documentation found here.

How To: Install Prometheus?

Prometheus is a free software application used for event monitoring and alerting. It records real-time metrics in a time series database built using a HTTP pull model, with flexible queries and real-time alerting. You can find more information at https://prometheus.io/.

Prometheus Method 1

The first method I used to install Prometheus on IBM IKS is an post I found by Bibin Wilson. You can read How to Setup Prometheus Monitoring On Kubernetes Cluster here:

• https://devopscube.com/setup-prometheus-monitoring-on-kubernetes/

Sources of files used in commands:

• https://raw.githubusercontent.com/bibinwilson/kubernetes-prometheus/master/clusterRole.yaml
• https://raw.githubusercontent.com/bibinwilson/kubernetes-prometheus/master/config-map.yaml

The prometheus-deployment.yaml:

apiVersion: apps/v1
kind: Deployment
metadata:
  name: prometheus-deployment
  namespace: monitoring
  labels:
    app: prometheus-server
spec:
  replicas: 1
  selector:
    matchLabels:
      app: prometheus-server
  template:
    metadata:
      labels:
        app: prometheus-server
    spec:
      containers:
        - name: prometheus
          image: prom/prometheus
          args:
            - "--config.file=/etc/prometheus/prometheus.yml"
            - "--storage.tsdb.path=/prometheus/"
          ports:
            - containerPort: 9090
          volumeMounts:
            - name: prometheus-config-volume
              mountPath: /etc/prometheus/
            - name: prometheus-storage-volume
              mountPath: /prometheus/
      volumes:
        - name: prometheus-config-volume
          configMap:
            defaultMode: 420
            name: prometheus-server-conf
  
        - name: prometheus-storage-volume
          emptyDir: {}

The prometheus-service.yaml:

apiVersion: v1
kind: Service
metadata:
  name: prometheus-service
  namespace: monitoring
  annotations:
      prometheus.io/scrape: 'true'
      prometheus.io/port:   '9090'
spec:
  selector: 
    app: prometheus-server
  type: NodePort  
  ports:
    - port: 8080
      targetPort: 9090 
      nodePort: 30000

The terminal commands I ran:

kubectl create -f clusterRole.yaml
nano config-map.yaml
kubectl create -f config-map.yaml
kubectl create namespace monitoring
kubectl create -f config-map.yaml
nano prometheus-deployment.yaml
kubectl create -f prometheus-deployment.yaml
kubectl get deployments --namespace=monitoring
kubectl get pods --namespace=monitoring
nano prometheus-service.yaml
kubectl create -f prometheus-service.yaml --namespace=monitoring

Port fwd localhost:

kubectl port-forward prometheus-deployment-54686956bd-nhz2s 8080:9090 -n monitoring

Then this Prometheus UI works:

http://localhost:8080/graph?g0.expr=&g0.tab=1&g0.stacked=0&g0.range_input=1h

Also the UI is exposed on public worker IP:

http://169.47.64.82:30000/graph?g0.expr=&g0.tab=1&g0.stacked=0&g0.range_input=1h

Prometheus Method 2

The second method I used to install Prometheus on IBM IKS is an official documentation post I found on https://kubernetes.github.io/. You can read more about Prometheus and Grafana installation here:

• https://kubernetes.github.io/ingress-nginx/user-guide/monitoring/

I completed the helm steps here:

  https://kubernetes.github.io/ingress-nginx/deploy/

{:height="24" width="24" align="absmiddle" style="padding: 10px"} this Ingres installs as default namespace
{:height="24" width="24" align="absmiddle" style="padding: 10px"} needs to be ingress-nginx

The terminal commands I ran:

kubectl create namespace ingress-nginx
kubectl get svc -n ingress-nginx
kubectl apply --kustomize github.com/kubernetes/ingress-nginx/deploy/prometheus/
helm install my-release ingress-nginx/ingress-nginx -n ingress-nginx
POD_NAME=$(kubectl get pods -l app.kubernetes.io/name=ingress-nginx -o jsonpath='{.items[0].metadata.name}')\
kubectl exec -it $POD_NAME -- /nginx-ingress-controller --version
kubectl get pods --all-namespaces
kubectl get svc -n default
kubectl get svc -n ingress-nginx
kubectl get nodes -o wide
kubectl apply --kustomize github.com/kubernetes/ingress-nginx/deploy/grafana/
kubectl get svc -n ingress-nginx

After install Promethus UI works:

http://169.47.64.84:32165/graph

Graphana works too:

http://169.47.64.84:32393/login
admin / admin

What's Next?

Stay tuned to the Cass-Operator + IKS page as I complete exposing how to use the Datastax Cassandra Operator for Kubernetes on IBM Cloud IKS Platform.

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