Rufus-Scheduler vs Sidekiq-Scheduler for Ruby Jobs
Comparing rufus-scheduler's in-process polling loop with sidekiq-scheduler's Redis-backed queue to pick the right one for single-process vs distributed apps.
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Rufus Scheduler: How Its Main Loop Actually Works
How rufus-scheduler's single-threaded main loop triggers, times out, and runs jobs, and where a timer-based rewrite would scale better.
Rack: The Interface Between Ruby Web Servers and Apps
Rack is the standard interface between Ruby web servers and frameworks, traced here through its middleware stack from request to response.
How to Rotate GKE Cluster Credentials
The gcloud commands for checking certificate expiry, starting rotation, upgrading nodes to the new certificate, and completing GKE credential rotation.
How to Debug React Applications
A rundown of debugging React apps: React Developer Tools in the browser, inspecting React Native, and running Jest tests under a real debugger.
Integer Overflow and Floating-Point Precision: Ruby vs JS
Why 0.1 + 0.2 doesn't equal 0.3, how Ruby's arbitrary-precision integers avoid overflow, and how JavaScript's BigInt does the same for large integers.
Container Security with Fine-Grained Permission Control
How Linux file permissions and Kubernetes securityContext settings enforce least-privilege access for containerized workloads, with a worked example.
Building and Deploying pgpool Images with GitHub Actions
A GitHub Actions workflow that builds multi-architecture pgpool images for several versions in parallel and pushes them to GitHub Container Registry.
SCORM: What the E-Learning Standard Actually Does
SCORM is the packaging and tracking standard that lets e-learning content run and report progress consistently across different learning platforms.
Supervisord: Process Management for Containers and VMs
How supervisord monitors and restarts UNIX processes through simple INI-style config, with a working example for MySQL, PHP, and an init script.