DevOpsDreams

Progressive Delivery with Canary and Blue-Green on Kubernetes: Argo Rollouts, Flagger, and Gateway API Canary and blue-green delivery fail when teams treat them as YAML patterns. This guide shows how rollout controllers, traffic routers, metrics gates, and rollback mechanics work together on Kubernetes. TL;DR Progressive delivery on Kubernetes is safest when rollout control, traffic control, and metric evaluation are separated. Native Deployments provide rolling updates and revision rollback, but canary and blue-green releases need explicit traffic splitting, health gates, and promotion rules. Argo Rollouts gives Kubernetes-native Rollout, AnalysisTemplate, and blue-green/canary strategies; Flagger automates service-mesh or Gateway API canaries from Deployment changes. The operational win is not slower rollout. It is aborting bad versions before they own user traffic, while keeping rollback targets, metrics, and database compatibility observable. Progressive delivery is a control lo...

Designing Terraform Modules for Platform Teams: A Deep Dive Terraform modules become reliable platform products only when their APIs are explicit. This guide covers interface design, composition roots, guardrails, tests, releases, docs, and operating models. TL;DR Platform teams should design Terraform modules as versioned product APIs, not shared folders of HCL. A good module exposes a small typed interface, validates unsafe input early, emits stable outputs, avoids embedded provider configuration, and leaves environment composition to root modules. Production readiness also requires examples, terraform test coverage, lint and policy guardrails, semantic versioning, registry documentation, a deprecation process, and ownership rules that define support, review, release cadence, consumer migration paths, and upgrade evidence for every supported module repository. Terraform Modules Are Platform APIs Terraform modules help platform teams standardize cloud infrastructure and reduce re...