The latest articles on DEV Community by miracle ify (@miracle_ify_be2aaea8e74f8). https://dev.to/miracle_ify_be2aaea8e74f8 https://media2.dev.to/dynamic/image/width=90,height=90,fit=cover,gravity=auto,format=auto/https:%2F%2Fdev-to-uploads.s3.amazonaws.com%2Fuploads%2Fuser%2Fprofile_image%2F3608150%2Fd7c14eb9-ecab-4499-8fa5-4e4b03714787.png https://dev.to/miracle_ify_be2aaea8e74f8 en miracle ify Wed, 12 Nov 2025 14:42:40 +0000 https://dev.to/miracle_ify_be2aaea8e74f8/build-your-own-virtual-private-cloud-vpc-on-linux-beginners-guide-52l https://dev.to/miracle_ify_be2aaea8e74f8/build-your-own-virtual-private-cloud-vpc-on-linux-beginners-guide-52l <h1> Build Your Own Virtual Private Cloud (VPC) on Linux – Beginner’s Guide </h1> <p>Learn how to recreate the fundamentals of a cloud Virtual Private Cloud (VPC) using Linux native tools. We'll simulate public and private subnets, routing, NAT, and isolation—all on your local machine!</p> <h2> Prerequisites </h2> <ul> <li>Linux host (or Docker container on macOS)</li> <li>Python 3.x</li> <li>Basic familiarity with Linux commands</li> </ul> <blockquote> <p>macOS users: Docker is required because Linux network namespaces and iptables require a Linux kernel.</p> </blockquote> <h2> Project Overview </h2> <p>We'll create:</p> <ul> <li>A VPC with a Linux bridge</li> <li>Public and private subnets</li> <li>NAT for public subnet</li> <li>Firewall rules for isolation</li> <li>Simple HTTP server to test connectivity</li> </ul> <h3> Architecture Diagram </h3> <div class="highlight js-code-highlight"> <pre class="highlight plaintext"><code> Internet | NAT Gateway | vpc-ifym (Bridge) / \ </code></pre> </div> <p>ifym_public ifym_private<br> (10.0.1.10/24) (10.0.2.10/24)</p> <h2> Step 1: Start the Docker Container &amp; Enter Project Folder </h2> <div class="highlight js-code-highlight"> <pre class="highlight plaintext"><code> bash docker start -ai vpc-lab cd /hng13-stage-4 Step 2: Clean Previous VPCs ip netns del ifym_public 2&gt;/dev/null ip netns del ifym_private 2&gt;/dev/null ip link del vethh1 2&gt;/dev/null ip link del vethn1 2&gt;/dev/null ip link del vpc-ifym 2&gt;/dev/null Step 3: Create VPC and Subnets python3 vpcctl.py create --config policies/policy.json Step 4: Test Connectivity Ping gateways: ip netns exec ifym_public ping -c 2 10.0.1.1 ip netns exec ifym_private ping -c 2 10.0.2.1 Ping between subnets (expected isolation): ip netns exec ifym_public ping -c 2 10.0.2.10 ip netns exec ifym_private ping -c 2 10.0.1.10 Step 5: Test NAT / Internet Access # Public subnet outgoing (should succeed) ip netns exec ifym_public curl -I https://example.com # Private subnet outgoing (should fail) ip netns exec ifym_private curl -I https://example.com Step 6: Deploy a Simple App in Public Subnet ip netns exec ifym_public python3 -m http.server 8080 &amp; ip netns exec ifym_public curl http://10.0.1.10:8080 # Should succeed ip netns exec ifym_private curl http://10.0.1.10:8080 # Should fail Step 7: Clean Teardown python3 vpcctl.py delete --config policies/policy.json All network namespaces, veth pairs, bridges, and firewall rules will be removed. Conclusion You’ve successfully: Built a mini VPC on Linux Created isolated subnets Deployed an app in a public subnet Verified NAT behavior Learned how Linux networking primitives simulate cloud networking. GitHub Repository: https://github.com/miracleify/hng13-devops-stage4 video https://drive.google.com/file/d/1auMrzhWmLcFqPF-H2pXWvXb6bPeSF_Fv/view?usp=sharing </code></pre> </div> linux networking python docker