Upgrading Bitnami Redis Helm Charts Without Downtime
A runbook for upgrading Bitnami's Redis Helm chart in Kubernetes, covering node migration, debug dry runs, and a tested rollback plan.
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Testing Non-ASCII Fonts with Prawn and PDF::Inspector
How to debug Unicode font rendering in Ruby's Prawn PDF library and work around PDF::Inspector's limits when testing non-ASCII characters like it.
Extracting the Second Page From Multiple PDFs on macOS
How to batch-extract one page from many PDFs on macOS and merge the results into a single file, using Poppler's pdfseparate/pdfunite or pdftk.
Migrating OTP Secrets Out of Google Authenticator
How to export TOTP secrets from Google Authenticator with the otpauth tool and import them into Authy, Aegis, or 1Password without losing account access.
Kaniko: building container images without a Docker daemon
Kaniko builds and pushes container images without a Docker daemon, and the setup for it differs across GitHub Actions, Google Cloud Build, and CircleCI.
ARG, ENV, and BuildKit secrets: how each behaves in Docker
ARG, ENV, exported shell variables, and BuildKit secret mounts each persist differently in a Docker image, and only one of them is actually safe for tokens.
Ruby readability vs performance: filter_map and a single loop
Ruby's filter_map cuts a multi-pass select/map/uniq chain to one pass, and a plain each loop goes further still when performance actually matters.
Linux kill signals: graceful shutdown in containerized workers
SIGTERM, SIGKILL, and grace periods control whether a containerized worker finishes its job before Kubernetes or Supervisord kills it outright.
Android build and debug tips: jenv, ADB, and wireless debugging
Practical notes on Android build and debug workflow: managing Java versions with jenv, wireless ADB debugging, release signing, and logcat filtering.
Retry mechanisms for flaky CI and Docker builds
Wrapping curl, bundle install, and Docker builds in retry logic turns transient network failures in CI into automatic retries instead of full pipeline restarts.