Blog

InfiniBand forwards nothing until one process has walked the fabric, addressed every port, and programmed every route. A deep look at opensm on a live SR-IOV fabric: sweeps, LIDs, partitions, virt_enabled, and why a VF can never be the boss.

Two Palo Altos, both forwarding, no floating IPs: eBGP to the N9K border pair and ECMP does the rest. Then a failover test found 90 seconds of silence, BFD refused to help, and the live re-test revealed that recovery, not failure, is where packets go to die.

A hands-on walkthrough of InfiniBand multi-tenancy on real hardware: one ConnectX-6 port split into four SR-IOV virtual functions, five VMs sorted into two P_Key partitions, and the isolation proven on the wire with packet captures and hardware state.

A Service can be green in Kubernetes and still unreachable from the next rack over. Here is how I let Cilium speak BGP so a service IP becomes a real route, ECMP across an EVPN/VXLAN fabric all the way to the edge. Stop bridging, start advertising.

A full build log of a production-shaped OpenShift 4.22 platform that runs local AI inference: a Nexus vPC fabric, an HA Palo Alto firewall pair, an agent-based install, a complete day-2 stack, and the n8n plus local-LLM agent that watches every layer and pages me on Telegram with a fix.

A practical redesign of a 4,000-GPU B200 cluster using RoCEv2 over Ethernet. This companion dives into lossless fabric engineering, BGP underlay, congestion control, and real-world trade-offs versus InfiniBand at hyperscale.

I built a leaf-spine data center fabric, connected it to Kubernetes with Cilium BGP, exposed services through LoadBalancer VIPs, enforced L3/L7 policy, and traced the end-to-end data path with Hubble, from client request to pod response.

Step-by-step tutorial for running a multicluster Kubernetes setup locally using Kind. Covers regional LoadBalancer routing, cross-cluster connectivity, failover simulation, and rolling updates across three clusters.

Your organisation's knowledge is locked in PDFs and documents nobody has time to read. This guide shows you how to train a private AI on that material, run it on your own machine, and query it like a senior expert who never sleeps.