https://www.youngju.dev/blog 천천히 올바르게. AI Researcher & DevOps Engineer Youngju's tech blog. GPU/CUDA, LLM, MLOps, Kubernetes AI workloads, distributed training, and data engineering. ko fjvbn2003@gmail.com (Youngju Kim) fjvbn2003@gmail.com (Youngju Kim) Mon, 15 Jun 2026 00:00:00 GMT https://www.youngju.dev/blog/kubernetes/2026-06-15-kubernetes-operator-pattern-explained.en https://www.youngju.dev/blog/kubernetes/2026-06-15-kubernetes-operator-pattern-explained.en A deep, operations-focused look at what the Operator pattern solves, how the control loop and reconciliation work, how CRDs and controllers combine, control plane extension mechanisms, Capability Levels, and when to use Operators and when to avoid them. Mon, 15 Jun 2026 00:00:00 GMT fjvbn2003@gmail.com (Youngju Kim) kubernetesoperatorcontrollerreconcilecrdcloud-native https://www.youngju.dev/blog/kubernetes/2026-06-15-kubernetes-operator-pattern-explained.ja https://www.youngju.dev/blog/kubernetes/2026-06-15-kubernetes-operator-pattern-explained.ja Operator パターンが何を解決するのか、コントロールループとリコンサイルの原理、CRD とコントローラーの結合、コントロールプレーンの拡張メカニズム、Capability Level、そしていつ使い、いつ避けるべきかまでを運用視点で深く整理します。 Mon, 15 Jun 2026 00:00:00 GMT fjvbn2003@gmail.com (Youngju Kim) kubernetesoperatorcontrollerreconcilecrdcloud-native https://www.youngju.dev/blog/kubernetes/2026-06-15-kubernetes-operator-pattern-explained https://www.youngju.dev/blog/kubernetes/2026-06-15-kubernetes-operator-pattern-explained Operator 패턴이 무엇을 푸는지, 컨트롤 루프와 reconcile 원리, CRD와 컨트롤러의 결합, 컨트롤 플레인 확장 메커니즘, Capability Level, 그리고 언제 쓰고 언제 쓰지 말아야 하는지까지 운영 관점에서 깊이 있게 정리합니다. Mon, 15 Jun 2026 00:00:00 GMT fjvbn2003@gmail.com (Youngju Kim) kubernetesoperatorcontrollerreconcilecrdcloud-native https://www.youngju.dev/blog/kubernetes/2026-06-15-operator-best-practices-antipatterns.en https://www.youngju.dev/blog/kubernetes/2026-06-15-operator-best-practices-antipatterns.en A code-level rundown of what makes a good Operator and the common anti-patterns. From principles like a small API, idempotent reconcile, observability, and safe upgrades, through pitfalls like side-effect spam, status misuse, infinite requeue, and broad RBAC, to multi-tenancy and security, resource efficiency, testing culture, SRE-style operations, a maturity roadmap, and a checklist. Mon, 15 Jun 2026 00:00:00 GMT fjvbn2003@gmail.com (Youngju Kim) kubernetesoperatorbest-practicesreconcilerbacsre https://www.youngju.dev/blog/kubernetes/2026-06-15-operator-best-practices-antipatterns.ja https://www.youngju.dev/blog/kubernetes/2026-06-15-operator-best-practices-antipatterns.ja 良いOperatorの特徴とよくあるアンチパターンをコードレベルで整理します。小さなAPIと冪等なreconcile、観測可能性、安全なアップグレードといった原則から、副作用の乱発・statusの誤用・無限requeue・広範なRBACといった落とし穴、マルチテナンシーとセキュリティ、リソース効率、テスト文化、SRE観点の運用、成熟度ロードマップとチェックリストまで扱います。 Mon, 15 Jun 2026 00:00:00 GMT fjvbn2003@gmail.com (Youngju Kim) kubernetesoperatorbest-practicesreconcilerbacsre https://www.youngju.dev/blog/kubernetes/2026-06-15-operator-best-practices-antipatterns https://www.youngju.dev/blog/kubernetes/2026-06-15-operator-best-practices-antipatterns 좋은 Operator의 특징과 흔한 안티패턴을 코드 수준에서 정리합니다. 작은 API와 멱등 reconcile, 관측 가능성, 안전한 업그레이드 같은 원칙부터 부수효과 남발·status 오용·무한 requeue·광범위 RBAC 같은 함정, 멀티테넌시와 보안, 리소스 효율, 테스트 문화, SRE 관점 운영, 성숙도 로드맵과 체크리스트까지 다룹니다. Mon, 15 Jun 2026 00:00:00 GMT fjvbn2003@gmail.com (Youngju Kim) kubernetesoperatorbest-practicesreconcilerbacsre https://www.youngju.dev/blog/kubernetes/2026-06-15-operator-reconcile-loop-deep-dive.en https://www.youngju.dev/blog/kubernetes/2026-06-15-operator-reconcile-loop-deep-dive.en A deep dissection of the reconcile loop: the request flow (informer to workqueue to reconcile), Result and requeue, idempotency patterns, status and conditions, predicate event filters, rate limiting and concurrency, cache vs. client, observability, common bugs, and performance tuning. Mon, 15 Jun 2026 00:00:00 GMT fjvbn2003@gmail.com (Youngju Kim) kubernetesoperatorreconcilecontroller-runtimeperformancecloud-native https://www.youngju.dev/blog/kubernetes/2026-06-15-operator-reconcile-loop-deep-dive.ja https://www.youngju.dev/blog/kubernetes/2026-06-15-operator-reconcile-loop-deep-dive.ja reconcile リクエストの流れ(informer→workqueue→reconcile)、Result と requeue、冪等実装パターン、status と conditions、predicate によるイベントフィルタ、レート制限と並行性、キャッシュとクライアント、観測、よくあるバグ、性能チューニングまで reconcile ループを深く解剖します。 Mon, 15 Jun 2026 00:00:00 GMT fjvbn2003@gmail.com (Youngju Kim) kubernetesoperatorreconcilecontroller-runtimeperformancecloud-native https://www.youngju.dev/blog/kubernetes/2026-06-15-operator-reconcile-loop-deep-dive https://www.youngju.dev/blog/kubernetes/2026-06-15-operator-reconcile-loop-deep-dive reconcile 요청 흐름(informer→workqueue→reconcile), Result와 requeue, 멱등 구현 패턴, status와 conditions, predicate 이벤트 필터, rate limiting과 동시성, 캐시와 클라이언트, 관측, 흔한 버그, 성능 튜닝까지 reconcile 루프를 깊이 있게 해부합니다. Mon, 15 Jun 2026 00:00:00 GMT fjvbn2003@gmail.com (Youngju Kim) kubernetesoperatorreconcilecontroller-runtimeperformancecloud-native