How to Write Deployment-friendly Applications
summary
Argues that apps must be environment‑agnostic and shows a working Pyramid web app wired to start via runapp.sh, served with gunicorn, logs to stdout, and configured through environment variables (validated into classes with an env‑config style loader). Secrets come from Vault or platform-specific stores, readiness/liveness endpoints enable zero‑downtime updates behind nginx/HAProxy, Postgres/Redis replace local state, and this pattern scales — exemplified by systems handling billions of requests in production.
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