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Networking
This is Part 3 of the Rack2Cloud Diagnostic Series, where we debug the silent killers of Kubernetes reliability. You deploy your application. The pods are Running. kubectl port-forward works perfectly. You open the public URL, expecting success. 502 Bad Gateway. Or maybe: Welcome to the Networking Illusion. In Kubernetes, “Network Connectivity” is a stack of…
Part 3 of the Rack2Cloud’s Cloud Fragility Series The Great API Distraction For the past fifteen years, we obsessed over the wrong kind of lock-in. Everyone worried: “If I use DynamoDB or Azure Functions, am I trapping my code forever?” So, we poured billions of hours and dollars into building abstraction layers, adopting Kubernetes, and…
The “Stockout” Error on a Healthy Subnet It’s 2 PM on a random Tuesday, and suddenly the Cluster Autoscaler throws a warning: Unschedulable—No free IPs in subnet. You open up the VPC. The subnet’s a /20, so that’s 4,096 IPs. You only have 15 nodes. Quick math: 15 nodes, maybe 30 pods each, tops. That’s…
The NCCL Timeout Nightmare You dropped $50 million on H200s. Wired them up with 800G OSFP optics. Fired up your 100,000-GPU cluster for the “Big Run.” Six hours in, everything’s humming—until the loss curve just flatlines. Logs start screaming: NCCL_WATCHDOG_TIMEOUT. It’s not a bad GPU. It’s not a driver crash. Honestly, it’s just physics. Once…
The “Impossible” Fix: Class E Migration In Part 1, we diagnosed the crime scene: A production GKE cluster flatlined because its /20 subnet (4,096 IPs) hit a hard ceiling at exactly 16 nodes. The “Official” consultant solution? Rebuild the VPC with a /16. The “Actual” engineering solution? Class E Address Space. If you are reading…
Everyone loves the “green lights” on a migration dashboard. I’ve sat in plenty of steering committee meetings where the project lead flashes a slide showing 500 VMs successfully moved from ESXi to AHV using Nutanix Move. There is applause, the project is marked “Complete,” and the consultants leave. But for the Solution Engineers and Cloud…
