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TASK_134_Deploy_Nagios_on_Kubernetes.md

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Start:         2023-06-22 03:35:55
Finished:   2023-06-22 03:48:25

TASK 134: Deploy Nagios on Kubernetes

Requirements

The Nautilus DevOps team is planning to set up a Nagios monitoring tool to monitor some applications, services etc. They are planning to deploy it on Kubernetes cluster. Below you can find more details.

  1. Create a deployment nagios-deployment for Nagios core. The container name must be nagios-container and it must use jasonrivers/nagios image.

  2. Create a user and password for the Nagios core web interface, user must be xFusionCorp and password must be LQfKeWWxWD. (you can manually perform this step after deployment)

  3. Create a service nagios-service for Nagios, which must be of targetPort type. nodePort must be 30008.

You can use any labels as per your choice.

Note: The kubectl on jump_host has been configured to work with the kubernetes cluster.

Steps

Create the deploy.yml based on the requirements.

apiVersion: apps/v1
kind: Deployment
metadata:
  name: nagios-deployment
spec:
  replicas: 1
  selector:
    matchLabels:
      app: nagios-core
  template:
    metadata:
      labels:
        app: nagios-core
    spec:
      containers:
        - name: nagios-container
          image: jasonrivers/nagios
---
apiVersion: v1
kind: Service
metadata:
  name: nagios-service
spec:
  type: NodePort
  selector:
    app: nagios-core
  ports:
    - port: 80
      targetPort: 80
      nodePort: 30008

Apply.

kubectl apply -f .

Verify.

thor@jump_host ~$ kubectl get pods
NAME                                 READY   STATUS    RESTARTS   AGE
nagios-deployment-6674945696-kwx9v   1/1     Running   0          59s

thor@jump_host ~$ kubectl get svc
NAME             TYPE        CLUSTER-IP     EXTERNAL-IP   PORT(S)        AGE
kubernetes       ClusterIP   10.96.0.1      <none>        443/TCP        14m
nagios-service   NodePort    10.96.26.162   <none>        80:30008/TCP   65s

Open a shell on the pod to create the username and password.

kubectl exec -it nagios-deployment-6674945696-kwx9v /bin/bash 
root@nagios-deployment-6674945696-kwx9v:/# htpasswd /opt/nagios/etc/htpasswd.users xFusionCorp

New password: 
Re-type new password: 
Adding password for user xFusionCorp

To verify the deployment, click the Nagios button.

In the pop-up window, enter the username and password.

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