Kubernetes : Deploy Prometheus2026/05/15

Deploy Prometheus to monitor metrics in Kubernetes Cluster.

This example is based on the environment like follows.

+----------------------+   +----------------------+
|  [ ctrl.srv.world ]  |   |   [ dlp.srv.world ]  |
|     Manager Node     |   |     Control Plane    |
+-----------+----------+   +-----------+----------+
        eth0|10.0.0.25             eth0|10.0.0.30
            |                          |
------------+--------------------------+-----------
            |                          |
        eth0|10.0.0.51             eth0|10.0.0.52
+-----------+----------+   +-----------+----------+
| [ node01.srv.world ] |   | [ node02.srv.world ] |
|     Worker Node#1    |   |     Worker Node#2    |
+----------------------+   +----------------------+

[1]	On this example, configure [nfs.srv.world:/home/nfsshare] directory on NFS server as external storage, and also configure dynamic volume provisioning with NFS plugin like the example [1], [2], [3] of here.
[2]	Install Prometheus chart with Helm.

ubuntu@ctrl:~$

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

"prometheus" has been added to your repositories

# create a namespace for Prometheus

ubuntu@ctrl:~$

kubectl create namespace monitoring

namespace/monitoring created

ubuntu@ctrl:~$

kubectl get storageclass

NAME         PROVISIONER                                                RECLAIMPOLICY   VOLUMEBINDINGMODE   ALLOWVOLUMEEXPANSION   AGE
nfs-client   cluster.local/nfs-client-nfs-subdir-external-provisioner   Delete          Immediate           true                   4m57s

ubuntu@ctrl:~$ helm install prometheus \
-n monitoring prometheus/kube-prometheus-stack \
--set prometheus.prometheusSpec.storageSpec.volumeClaimTemplate.spec.storageClassName="nfs-client" \
--set prometheus.prometheusSpec.storageSpec.volumeClaimTemplate.spec.resources.requests.storage=10Gi \
--set grafana.persistence.enabled=true \
--set grafana.persistence.storageClassName="nfs-client" \
--set grafana.persistence.size=10Gi 
NAME: prometheus
LAST DEPLOYED: Fri May 15 00:40:18 2026
NAMESPACE: monitoring
STATUS: deployed
REVISION: 1
TEST SUITE: None
NOTES:
kube-prometheus-stack has been installed. Check its status by running:
  kubectl --namespace monitoring get pods -l "release=prometheus"

Get Grafana 'admin' user password by running:

  kubectl --namespace monitoring get secrets prometheus-grafana -o jsonpath="{.data.admin-password}" | base64 -d ; echo

Access Grafana local instance:

  export POD_NAME=$(kubectl --namespace monitoring get pod -l "app.kubernetes.io/name=grafana,app.kubernetes.io/instance=prometheus" -oname)
  kubectl --namespace monitoring port-forward $POD_NAME 3000

Get your grafana admin user password by running:

  kubectl get secret --namespace monitoring -l app.kubernetes.io/component=admin-secret -o jsonpath="{.items[0].data.admin-password}" | base64 --decode ; echo


Visit https://github.com/prometheus-operator/kube-prometheus for instructions on how to create & configure Alertmanager and Prometheus instances using the Operator.

ubuntu@ctrl:~$

kubectl get pods -n monitoring

NAME                                                     READY   STATUS    RESTARTS   AGE
alertmanager-prometheus-kube-prometheus-alertmanager-0   2/2     Running   0          48s
prometheus-grafana-c65cfd88b-jmj4q                       2/3     Running   0          56s
prometheus-kube-prometheus-operator-5fc897b57f-rztfw     1/1     Running   0          56s
prometheus-kube-state-metrics-5d4654dd56-8svqz           1/1     Running   0          56s
prometheus-prometheus-kube-prometheus-prometheus-0       2/2     Running   0          48s
prometheus-prometheus-node-exporter-957xk                1/1     Running   0          56s
prometheus-prometheus-node-exporter-px67r                1/1     Running   0          56s
prometheus-prometheus-node-exporter-vss97                1/1     Running   0          56s

# show admin password for Grafana

ubuntu@ctrl:~$

echo "Password: $(kubectl get secret --namespace monitoring -l app.kubernetes.io/component=admin-secret -o jsonpath="{.items[0].data.admin-password}" | base64 -d)"

Password: PlNdpFJpvTLjDLaaxmWJYOepfQbDWVosQYnD7SqS

# if access from outside of cluster, set port-forwarding

ubuntu@ctrl:~$

kubectl port-forward -n monitoring service/prometheus-kube-prometheus-prometheus --address 0.0.0.0 9090:9090 &

ubuntu@ctrl:~$

kubectl port-forward -n monitoring service/prometheus-grafana --address 0.0.0.0 3000:80 &

[3]	If you set port-forwarding, access to the Prometheus URL below on a client computer in your local network. ⇒ http://(Manager Node Hostname or IP address):(setting port)/ That's OK if following Prometheus UI is displayed.

[4]	For Grafana, access the following URL. ⇒ http://(Manager Node Hostname or IP address):(setting port)/ That's OK if following Grafana UI is displayed.

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