Step by step to install Prometheus in Kubernetes Cluster with Helm

In this blog we will see how to install Prometheus in Kubernetes cluster and view the metrics of Kubernetes Cluster.

Prometheus : It is an open source tool which used to collect real time metrics and modern alerting.

Requirements :

1. Kubernetes cluster
2. helm

My Environment details,

Kubernetes version : 1.15.3
Helm version : 2.16.8
Single node kubernetes cluster

Step 1:

Add official Charts repository in helm,

# helm repo add stable https://kubernetes-charts.storage.googleapis.com

To list the repository list in helm,

#  helm repo list



Step 2 :

Install Prometheus by helm,

#  helm install stable/prometheus --name prometheus

If you need to deploy prometheus in separate namespace you can add, --namespace namespace-name in the above command at the end.




To check the helm installed application,

# helm list



Wait for few minutes until the pods are getting created.

Now check the pods status of prometheus

# kubectl get pods



when we check the status of the pod, we can see prometheus-altermanager and prometheus-server pods are still in pending state its due to persistent volume.when I checked the persistent volume claim status it is in pending,

# kubectl get pvc



To overcome this issue, execute this below command,

# mkdir /mnt/prometheusvol{1,2}

Note: execute above mkdir command in all the nodes in the cluster.

Then execute in master server,

# kubectl create -f - <<EOF
kind: PersistentVolume
apiVersion: v1
metadata:
  name: prometheusvol1
spec:
  storageClassName:
  capacity:
    storage: 5Gi
  accessModes:
    - ReadWriteOnce
  hostPath:
    path: "/mnt/prometheusvol1"
---
kind: PersistentVolume
apiVersion: v1
metadata:
  name: prometheusvol2
spec:
  storageClassName:
  capacity:
    storage: 10Gi
  accessModes:
    - ReadWriteOnce
  hostPath:
    path: "/mnt/prometheusvol2"
EOF

Now check the pvc and pod status,



Now everything is working fine.

Step 3:

Access Prometheus,

To access prometheus edit prometheus-server service and change ClusterIP to NodePort.

# kubectl get svc

# kubectl edit svc prometheus-server



Now we get the port to access prometheus in browser,here my prometheus server port is 32114. I will go to browser,

URL : Kubernetes IP:Portnumber

http://192.168.108.4:32114


I can access the Prometheus in browser. From the Menu go to status > Targets to check the status of all Kubernetes applications.



I can see the metrics for kubernetes events in prometheus Graph,



That's all we have installed Prometheus successfully in Kubernetes cluster and can view the metrics.