Demo Installing software in VM

In this lesson, we'll set up a DevSecOps environment on an Azure Virtual Machine. We’ll install Docker, Kubernetes (kubeadm & kubectl), Jenkins, and Maven, then deploy a simple Nginx application. This end-to-end tutorial is ideal for anyone looking to automate CI/CD in the cloud.

Verifying Deployment in Azure

After your deployment finishes, confirm that all resources (VM, network interfaces, disks, VNet, NSGs, public IP) show a Succeeded status:

Tip: Use the Azure portal’s search and filter features to quickly locate resources in large subscriptions.

Configuring a DNS Name

Assigning a DNS label to your VM’s public IP makes SSH and service URLs easier to remember:

1. In the Azure portal, go to your Resource Group.
2. Select the Public IP resource (e.g., devsecops-cloud-ip).
3. Under Configuration, enter a DNS name label (e.g., DevSecOpsDemo).
4. Click Save.

After saving, refresh the VM overview to see the FQDN:
DevSecOpsDemo.eastus.cloudapp.azure.com

Connecting via SSH

Use any SSH client. Here’s an example with MobaXterm:

• Remote host: DevSecOpsDemo.eastus.cloudapp.azure.com
• Username: your VM admin (e.g., devsecops)

Enter your password or SSH key to log in.

Preparing the VM

Switch to the root user to avoid typing sudo repeatedly:

devsecops@devsecops-cloud:~$ sudo -i
root@devsecops-cloud:~#

Cloning the Demo Repository

Download the demo scripts and navigate to the install script directory:

root@devsecops-cloud:~# git clone https://github.com/sidd-harth/devsecops-k8s-demo.git
root@devsecops-cloud:~# cd devsecops-k8s-demo/setup/vm-install-script/
root@devsecops-cloud:~/devsecops-k8s-demo/setup/vm-install-script# ls -l
-rw-r--r-- 1 root root 3024 Jun 14 18:02 install-script.sh

Running the Install Script

The install-script.sh automates installation of:

Execute the installer (this may take several minutes):

root@devsecops-cloud:~/devsecops-k8s-demo/setup/vm-install-script# bash install-script.sh
...
Setting up jenkins (2.289.1) ...
...

When finished, confirm your Kubernetes node is ready:

root@devsecops-cloud:~# kubectl get node -o wide
NAME              STATUS   ROLES                  AGE   VERSION   INTERNAL-IP   OS-IMAGE            KERNEL-VERSION
devsecops-cloud   Ready    control-plane,master   4m    v1.20.0   10.0.0.4      Ubuntu 18.04.5 LTS   5.4.0-1

Deploying a Sample Nginx Application

1. Create the Nginx pod:

   root@devsecops-cloud:~# kubectl run nginx-pod --image=nginx
   pod/nginx-pod created
   

2. Check pod status:

   root@devsecops-cloud:~# kubectl get pods
   NAME        READY   STATUS             RESTARTS   AGE
   nginx-pod   0/1     ContainerCreating  0          15s
   

   Watch until it’s running:

   root@devsecops-cloud:~# kubectl get pods -w
   NAME        READY   STATUS    RESTARTS   AGE
   nginx-pod   1/1     Running   0          25s
   

3. Expose it via a NodePort service:

   root@devsecops-cloud:~# kubectl expose pod nginx-pod --type=NodePort --port=80
   service/nginx-pod exposed
   root@devsecops-cloud:~# kubectl get svc nginx-pod
   NAME        TYPE       CLUSTER-IP    EXTERNAL-IP   PORT(S)        AGE
   nginx-pod   NodePort   10.96.xxx.xxx <none>        80:32325/TCP   1m
   

4. In your browser, go to:

   http://DevSecOpsDemo.eastus.cloudapp.azure.com:32325
   

You should see the default Nginx welcome page.

Next, we’ll configure a Jenkins pipeline to automate builds and deployments in Kubernetes.

Links and References

• Azure Virtual Machines Documentation
• Docker Documentation
• Kubernetes Basics
• Jenkins User Handbook
• Apache Maven Project