Running Multiple Processes in a Single Container
Six ways to run multiple processes in one Docker container, from GNU Parallel and Foreman to a custom entrypoint script, Supervisord, and tmux, with trade-offs.
Writing
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Why Kaminari's Anonymous Modules Break Rails Caching
Why Rails caching raises TypeError: can't dump anonymous module with Kaminari-paginated collections, and how to trace and fix the module causing it.
Passing Sass Variables at Build Time with Webpack
How to inject a Sass variable, like a theme's primary color, at build time using a SASS_OPTIONS environment variable and a custom webpack additionalData function.
OpenVPN: Restrict Client Access to Specific IPs Only
How to restrict OpenVPN clients to a limited set of destination IPs, using client-config-dir routes, a client-connect script, and iptables rules.
Upgrading React 17 to 18: Root API, Batching, and Test Fixes
What changes when you upgrade React 17 to 18: the new root API, automatic batching, Strict Mode's double-invoked effects, and test setup fixes.
Upgrading React 16 to 17: Dependencies, Jest, and ESLint Fixes
A practical walkthrough of upgrading a React 16 app to React 17, covering dependency updates, Jest and Enzyme test fixes, and new ESLint warnings.
Fixing Multi-Tab Session Bugs with JWT and sessionStorage
How cookie-based session state breaks when a user opens multiple tabs in a single-page app, and how splitting auth into JWT plus sessionStorage fixes it.
k3s on Ubuntu: Install, kubectl Access, and Unauthorized Errors
How to install k3s on Ubuntu, connect with kubectl, and fix the 'You must be logged in to the server (Unauthorized)' error caused by kubeconfig or expired certs.
Self-Hosted Whisper: A Speech-to-Text API with Ruby and Kubernetes
How to run OpenAI's Whisper as a self-hosted speech-to-text REST API with Docker, a Ruby client, and a Kubernetes deployment for transcribing audio.
adb shell pm: Managing Android Packages from the Command Line
How to use adb shell pm to list, install, uninstall, disable, and inspect Android packages, including removing bloatware without root.