Observed Signal · May 13, 2026 · Technical Guide · Source: DEV Community · Impact: 1/5 · Sentiment: Neutral
Kubernetes Networking: MetalLB, Nginx Ingress, NetworkPolicy
This technical how-to (Part 2) describes converting a bare-metal kubeadm cluster from NodePort to a production-style network: installing MetalLB to provide real LoadBalancer IPs, deploying the community Nginx Ingress Controller as a single HTTP/HTTPS entrypoint, updating services to ClusterIP, creating Ingress resources with hostname-based routing (app.oty-k8s.local, api.oty-k8s.local), configuring local DNS, and applying Kubernetes NetworkPolicy manifests to enforce pod-to-pod allowlists. The post includes concrete kubectl commands, example MetalLB IP pool (192.168.1.200-192.168.1.220), guidance on networking modes (Layer 2 ARP advertisement), critical YAML pitfalls (Ingress API version, NetworkPolicy AND/OR indentation), and a seven-step test suite that verifies allowed and blocked connections. All manifests are published in a linked GitHub repository. Published 2026-05-13.
Practical, detailed tutorial on bare-metal Kubernetes networking useful for infrastructure engineers; not industry-shifting for AdTech/MarTech audiences.
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Key Takeaways & Evidence Grounding
- Author documents installing MetalLB using manifest https://raw.githubusercontent.com/metallb/metallb/v0.14.5/config/manifests/metallb-native.yaml
- Community Nginx Ingress Controller deployed from controller-v1.9.5 static provider YAML
- Example MetalLB IPAddressPool configured for 192.168.1.200-192.168.1.220 and L2Advertisement (Layer 2 ARP mode)
- Application services switched from NodePort to ClusterIP and routed via an Ingress resource to hostnames app.oty-k8s.local and api.oty-k8s.local
- NetworkPolicy manifests applied to enforce pod-level allowlist with automated tests verifying blocked and allowed connections (postgres, backend, frontend, ingress controller)
Ontology Mapping & Concepts
Related Market Signals & Shifts
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