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devops

Two markers on a capability versus cost per task chart: a cheap efficient option and an expensive high-capability option
AI

AI Infrastructure and SRE: Running Models in Production

A field guide to running AI in production: the supply chain as a dependency, quiet failure as the default mode, the verification gate as the method, and cost per correctly solved task as the metric.

By Julien Laurenceau, 5 days2026-09-30 ago
A dark laptop with a glowing cyan signal line running to a wireless headset on its charging pad, labeled SIGNAL HELD OPEN
devops

AliExpress’s Silent Audio Script Hijacked a Bluetooth Headset

AliExpress Web Audio scripts left a Bluetooth audio path open. The evidence shows a broad anti-abuse fingerprinting system, but not a unique device ID.

By Julien Laurenceau, 1 month2026-08-24 ago
Abstract grid of glowing compute cells densely packed into reserved cluster capacity
apache spark

Spark on Kubernetes Reserves CPU It Never Uses. Here’s the Overcommit Fix.

Spark sets executor CPU requests equal to limits, so a Kubernetes cluster reserves twice the CPU it uses and refuses to schedule pending pods. Kubernetes has no native overcommit. Here is the mutating-webhook operator I use to fix it.

By Julien Laurenceau, 4 months2026-05-31 ago
data

The Hidden Costs of Using HDDs in On-Premises MinIO Deployments

Hidden storage costs are one of the targets of a data platform cost optimization review. Bring the IOPS dude ! As a solutions architect working with MinIO storage solutions, I’ve seen firsthand the challenges that come with on-premises deployments using hard disk drives (HDDs). While HDDs may seem like a Read more

By Julien Laurenceau, 10 months2025-12-15 ago
ceph

Choosing the Right Storage Backend for Kubernetes PVCs

Choosing a PVC backend is an architecture decision I review; the Ceph storage consulting page describes the cluster side. Most discussions about PVC focus on on-prem deployments, but many of these technologies are equally relevant in the cloud, especially when using managed block storage like AWS EBS, which caps at Read more

By Julien Laurenceau, 10 months2025-12-15 ago
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