Wiki Index
Last updated: 2026-04-10 (ingest: PostgreSQL HA — Patroni + pgpool-II — 3 permanent notes + 1 literature note)
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Permanent Notes
| Note | Domain | Summary |
|---|---|---|
| LLM Wiki Pattern | PKM/LLM | Pattern xây dựng knowledge base với LLM làm maintainer |
| RAG vs Compiled Knowledge | PKM/LLM | So sánh RAG (re-derive mỗi lần) vs compiled knowledge (tích lũy) |
| Zettelkasten | PKM | Phương pháp atomic notes + linking của Niklas Luhmann |
| CIP và Counterpart Fund | Lịch sử/Kinh tế | Cơ chế ẩn lương QLVNCH trong viện trợ kinh tế Mỹ — 1955–1975 |
| MAP và EDA — Định Giá Thấp Vũ Khí Viện Trợ | Lịch sử/Kinh tế | Structural underreporting vũ khí viện trợ qua cơ chế EDA book value |
| Lầu Năm Góc và Giám Sát Quốc Hội | Lịch sử/Chính trị | Bức tranh tổng thể về khoảng trống oversight của Quốc Hội Mỹ trong Vietnam War |
| GENEVE) | Infrastructure | Overlay tunnels giải quyết VLAN limit; VNI allocation và OVS flow pipeline |
| OpenStack External Network Mapping | Infrastructure | Provider networks kết nối vào tenant overlays qua OVS bridge + router namespace |
| DVR — Distributed Virtual Router | Infrastructure | Phân tán L3 routing ra compute nodes; east-west + floating IP north-south |
| Floating IP NAT Mechanism | Infrastructure | DNAT/SNAT iptables rules; centralized vs. DVR models |
| EVPN External Connectivity in OpenStack | Infrastructure | Dynamic routing at scale: neutron-dynamic-routing, BGPVPN, ovn-bgp-agent |
| Kolla-Ansible Deployment Patterns | Infrastructure | Multi-node deploy; hostname resolution trap; RAM requirements; nova cell_v2 discovery |
| OVS Bridge Management NIC Pitfall | Infrastructure | OVS L2 takeover làm mất SSH; recovery qua noVNC; rule: chỉ provider NIC vào br-ex |
| OpenStack Provider Net Routing (No Floating IP) | Infrastructure | Static route từ jump host qua ctrl-1; gateway IP phải trên br-ex |
| Packer OpenStack Image Pipeline | Infrastructure | Packer + Glance; use_floating_ip=false; image lifecycle candidate→approved |
| Trove Guest Agent Connectivity (OVN) | Infrastructure | OVN logical IP vs Linux IP; RabbitMQ dual listener; DNAT Keystone; SNAT internet |
| Trove PostgreSQL HA Replication | Infrastructure | Primary/replica via —replica-of; Swift mandatory; security group gotcha; failover |
| Patroni | Infrastructure/DB | HA orchestrator cho PostgreSQL; Raft consensus qua etcd; automatic failover |
| Pgpool-II | Infrastructure/DB | Connection proxy: pooling, read load balancing, write routing tới primary |
| PostgreSQL HA: Patroni + Pgpool-II | Infrastructure/DB | Combined pattern: Patroni lo failover, pgpool-II lo routing — không overlap |
| Swift Single-Node Setup (Kolla) | Infrastructure | Loopback disk; GPT label KOLLA_SWIFT_DATA; XFS label d0; ring builder replicas=1 |
| DevOps | DevOps | Văn hóa + thực hành kết hợp Dev và Ops để rút ngắn delivery cycle |
| Site Reliability Engineering (SRE) | DevOps | Google model: dùng software engineering để giải quyết vấn đề operations |
| SLSA — Supply-chain Levels for Software Artifacts | DevOps/Security | Framework bảo vệ software supply chain theo 4 levels |
| CD | DevOps | Cặp thực hành tự động hóa tích hợp và delivery liên tục |
| Continuous Integration (CI) | DevOps | Tự động hóa build, test sau mỗi commit; triết lý shift-left |
| Continuous Delivery (CD) | DevOps | Đảm bảo codebase luôn release-ready; release là quyết định của người |
| Continuous Deployment | DevOps | Mọi commit pass pipeline đều tự động lên production |
| DevOps Topology | DevOps | 9 mô hình tổ chức nhóm DevOps + 8 anti-patterns cần tránh |
| DevOps Pipeline Stages | DevOps | 9 stage từ Plan đến Monitor; shift-left security, feature flags |
| DORA Metrics | DevOps/Metrics | 4 metrics đo velocity + stability của DevOps organization |
| Mean Time to Restore (MTTR) | DevOps/Metrics | Thời gian phục hồi sau incident; cặp với Change Failure Rate trong DORA |
| Feature Flag | DevOps | Tách deployment khỏi release; progressive rollout và kill switch |
| Flow Framework | Flow/Metrics | 4 Flow Items + 5 Flow Metrics đo hiệu suất value stream (Mik Kersten) |
| Cost of Delay | Flow/Product | Giá trị kinh tế bị mất do trì hoãn delivery; nền tảng của CD3 prioritization |
| Little’s Law | Flow/Math | L = λW: mối quan hệ WIP, throughput, cycle time trong hệ thống ổn định |
| Kingman’s Formula | Flow/Math | VUT equation: utilization + variability → wait time tăng phi tuyến |
| Time to Market (TTM) | Product/Metrics | Từ ý tưởng đến tay khách hàng; rộng hơn Lead Time for Changes |
| Pirate Metrics (AARRR) | Product/Growth | 5 stages vòng đời khách hàng: Acquisition → Activation → Retention → Referral → Revenue |
| SAFe — Scaled Agile Framework | Agile/SAFe | Framework tích hợp Lean, Agile, DevOps cho Business Agility; 4 cấu hình, 10 nguyên tắc |
| SAFe Planning Interval (PI) | Agile/SAFe | Khung thời gian cadence-based 8–12 tuần; ART deliver value theo từng PI |
| SAFe IP Iteration | Agile/SAFe | Innovation & Planning iteration cuối PI: buffer, hackathon, PI Planning, I&A |
| SAFe Enablers | Agile/SAFe | Backlog items mở rộng architecture runway: Exploration, Architectural, Infrastructure |
| SAFe Value Stream | Agile/SAFe | Operational vs Development Value Stream; tổ chức xung quanh value theo principle #10 |
| Value Stream Mapping (VSM) | Lean/Flow | Lean tool visualize toàn bộ flow; identify waste qua PT, LT, %C&A metrics |
| SAFe Agile Release Train (ART) | Agile/SAFe | Team of teams long-lived; cross-functional; delivery unit chính trong Essential SAFe |
| SAFe System Team | Agile/SAFe | DevOps team của ART; owns CI/CD pipeline, integration, và demo environment |
| Agile Manifesto | Agile | 4 values + 12 principles nền tảng Agile Software Development (2001) |
| Agile Cadence | Agile | Nhịp điệu đều đặn của events; nền tảng cho PI planning và team synchronization |
| CALMR | DevOps/SAFe | 5 trụ cột DevOps trong SAFe: Culture, Automation, Lean Flow, Measurement, Recovery |
| Scaling DevOps với SAFe | DevOps/SAFe | Essential SAFe, ART, 3 roles (RTE/PM/SA), và 4 khía cạnh DevOps theo CALMR |
| DevOps Transformation Canvas | DevOps/SAFe | Workshop tool 9 components; current/future state VSM để identify và improve bottleneck |
| Westrum Culture Typology | Culture/Leadership | 3 kiểu văn hóa (Pathological/Bureaucratic/Generative); xử lý thông tin bất thường |
| Continuous Learning Culture (CLC) | Culture/Learning | 3 dimensions + 5 Senge disciplines; Business Agility competency trong SAFe |
| Kotter’s 8-Step Change Model | Leadership/Change | 8 bước transformation tổ chức; urgency → coalition → vision → embed vào culture |
| Machine Learning | ML/AI | Thuật toán học từ dữ liệu; supervised vs unsupervised; overfitting là vấn đề core |
| K-Means Clustering | ML/Algorithm | Thuật toán phân cụm unsupervised; K centroids, iterative convergence, elbow method |
| Naive Bayes Classifier | ML/Algorithm | Supervised classifier dựa trên Bayes theorem; naive independence assumption |
| Overfitting và Underfitting | ML | Hai thái cực của generalization; K-fold cross-validation để detect |
| Theory of Constraints (TOC) | Lean/Flow | Hệ thống bị giới hạn bởi constraint; 5 focusing steps; nền tảng lý thuyết của VSM |
| Seekable OCI (SOCI) | Infrastructure | AWS lazy-loading container images; SOCI index; faster cold start cho Fargate/ECS/EKS |
| Resilience vs Robustness | DevOps/Reliability | MTBF vs MTTR trade-off; 4 Resilience Engineering capabilities; transition path to CD |
| Tail Latency | Distributed Systems | P99 latency outliers; compound effect in microservices; percentile monitoring |
| Hedged Requests | Distributed Systems | Client-side pattern: race multiple instances, use first response to reduce tail latency |
| China Data Regulation | Compliance | CSL + DSL + PIPL; data classification (Core/Important/General); cross-border transfer |
| Kubernetes Node Pool Design | Kubernetes | Taint/toleration + affinity; workload segregation; cost optimization by pool type |
| Kubernetes Node Consolidation | Kubernetes | Minimal node count; Cluster Autoscaler + overprovisioning; trade-off stateful/variable |
| Zero Trust Network in Kubernetes | Kubernetes/Security | mTLS STRICT + ServiceAccount identity; Calico + Istio sidecar vs Ambient mode |
| Container Runtime Security (Falco) | Kubernetes/Security | Syscall monitoring; kernel module + rule-based alerting; last line of defense |
| Multi-Cloud Architecture | Cloud/Architecture | Private cloud + AWS hybrid; K8s portability; GitOps; distributed storage; trade-offs |
| Lossless Semantic Tree (LST) | Testing | Pre-test analysis: full map of branches, deps, data flows; zero-call verification |
| AI-Assisted Testing | Testing/AI | LST as structured context for AI; human (analysis) + AI (implementation) multiplier |
| Software Architect Role | Architecture/Career | Architect vs developer: trade-off decisions; cost-awareness; ADR; Conway’s Law |
| System Design Patterns | Architecture | 8 core patterns: consistent hashing, CAP, sharding, caching, CDN, partitioning, queues |
| Cassandra HA on Kubernetes | Kubernetes/Database | DC = AZ mapping; StatefulSet per AZ; NetworkTopologyStrategy; Spot-safe HA design |
| T-Shaped Developer | Career/Agile | Broad + deep skillset; cross-functional team enabler; contrast with I-shaped specialist |
| AWS Lambda Cold Start | AWS/Serverless | Cold vs warm start; execution context reuse; keep-alive, /tmp caching optimizations |
| Git Object Model | Git/Internals | blob/tree/commit DAG; refs + logs; content-addressed recovery pattern |
Literature Notes
| Note | Source | Date Read |
|---|---|---|
| LLM Wiki — Karpathy | Andrej Karpathy (gist) | 2026-04-08 |
| Phương pháp 4:6 — Tetsu Kasuya | Project Barista | 2026-04-08 |
| 21 Năm Viện Trợ Mỹ ở VN | Đặng Phong (sách) | 2026-04-08 |
| OpenStack Neutron Docs | OpenStack official docs | 2026-04-09 |
| OpenStack Overlay Protocols — Research | OpenStack Docs, RFC 7348, RFC 8926 | 2026-04-09 |
| Proxmox DBaaS Lab — Day 1 to Day 4.5 | proxmox-dbaas-lab command packs + live journal | 2026-04-10 |
| PostgreSQL HA — Patroni + Pgpool-II | joao victor silva de oliveira (Medium) | 2026-04-10 |
Maps of Content
- OpenStack Networking — Overlay, DVR, Floating IP, BGP/EVPN
Legacy (refs/, til/, journal/)
Preserved as-is. Linked into permanent notes gradually.
| File | Type | Topic |
|---|---|---|
| DORA KPI Metrics | ref | DevOps |
| DevOps Topology | ref | DevOps |
| DevOps Pipelines | ref | DevOps |
| Ron Westrum — 3 Culture Types | ref | Culture/Leadership |
| Generative Culture | ref | Culture/Leadership |
| Continuous Learning | ref | Learning |
| Machine Learning | ref | ML |
| Unsupervised Learning | ref | ML |
| Naive Bayes Classifier | ref | ML |
| Multinomial Distribution | ref | ML/Math |
| SAFe PI | ref | Agile/SAFe |
| SAFe Enabler | ref | Agile/SAFe |
| SAFe Value Stream Mapping | ref | Agile/SAFe |
| SAFe Operational Value Stream | ref | Agile/SAFe |
| SAFe Metrics in VSM | ref | Agile/SAFe |
| TTM | ref | Business |
| Kotter 8-Step Change | ref | Leadership |
| System Design Concepts | journal | System Design |
| Cassandra on EKS Spot | journal | AWS/Infra |
| Lambda Optimization | journal | AWS |
| Recover Corrupted Git Repo | journal | Git |
| Command Tips | journal | CLI |
| T-Shaped Skills | journal | Career |
| TIL | til | Misc |
| Cafe | cooking | Cooking |