🧠 Athena

log

12 min read

Wiki Log

Append-only record of operations. Format: ## [YYYY-MM-DD] operation | description

[2026-04-08] ingest | 21 Năm Viện Trợ Mỹ ở Việt Nam — Đặng Phong

Key concepts added: cip-counterpart-fund-viet-nam, map-vien-tro-vu-khi-qlvnch, lau-nam-goc-qua-giam-sat-quoc-hoi Pages touched: 1 literature note (mới), 3 permanent notes (mới), index.md (cập nhật)

Highlights:

  • CIP counterpart fund: cơ chế ẩn lương QLVNCH trong viện trợ kinh tế — ngoài tầm giám sát Quốc Hội Mỹ
  • MAP/EDA: structural underreporting vũ khí viện trợ qua depreciated book value vs replacement cost
  • Bức tranh tổng thể: supplemental appropriations + Gulf of Tonkin deception + Pentagon Papers

[2026-04-08] capture | Kinh nghiệm coldbrew tại nhà

Ghi lại journey: Hario Filter-in Bottle (vỡ) → Soriso 600ml (vấn đề filter nhỏ) → workaround túi lọc trà + fine robusta 1:10. Pages touched: coldbrew-tai-nha.md (mới), pourover-setup-ca-nhan.md (cập nhật link), cafe.md (cập nhật MOC)

[2026-04-08] ingest | Phương pháp 4:6 — Tetsu Kasuya + capture setup cá nhân

Key concepts added: tetsu-kasuya-46-method (literature), pourover-setup-ca-nhan (cooking) Pages touched: 1 literature note, 1 cooking note (mới), cafe.md (cập nhật thành MOC), index.md

[2026-04-08] ingest | LLM Wiki — Andrej Karpathy (gist)

Key concepts added: llm-wiki-pattern, rag-vs-compiled-knowledge, zettelkasten Pages touched: 1 literature note, 3 permanent notes created, index.md updated

[2026-04-08] setup | Khởi tạo Athena LLM Wiki

Chuyển đổi từ manual wiki sang AI-maintained wiki theo pattern của Karpathy.

Thay đổi:

  • Tạo cấu trúc Zettelkasten: content/fleeting/, content/literature/, content/permanent/, content/maps/
  • Tạo raw/ directory cho sources (articles, books, assets)
  • Viết AGENTS.md — schema + instructions cho AI agent
  • Legacy folders (refs/, til/, journal/) được giữ nguyên, link dần vào permanent notes
  • Tạo index.md catalog với danh sách legacy notes

Notes hiện có: ~100 files trong legacy folders Permanent notes: 0 (chưa ingest source nào)

[2026-04-09] ingest | OpenStack Neutron Overlay Networks — VXLAN/GRE/GENEVE research

Key concepts added: vlan-4094-limit, vxlan-vni-scalability, openstack-neutron-overlay-protocols, openstack-ml2-overlay-config Pages touched: 1 literature note (mới), 4 permanent notes (mới), index.md (cập nhật)

Highlights:

  • Vấn đề: 12-bit 802.1Q VID → 4094 VLAN limit, không đủ cho large-scale multi-tenant cloud
  • VXLAN (RFC 7348): 24-bit VNI → 16.7M segments. UDP:4789. Fixed 8-byte header = limitation cho metadata
  • GRE: point-to-point, không support OVN, poor ECMP. Đang fade out trong deployments mới
  • GENEVE (RFC 8926): 24-bit VNI + variable-length TLV options. Default tunnel type của OVN. Cho phép in-band metadata, service chaining, transport security
  • OVN + VXLAN caveat: OVN giảm identifier xuống 12-bit → chỉ còn 4096 networks (phủ nhận mục đích của VXLAN)
  • Production recommendation 2026: GENEVE + OVN cho deployments mới; VXLAN + OVS + L2 population cho legacy
  • Critical footgun: ml2_conf.ini max_header_size default=30, OVN cần >=38

[2026-04-09] ingest | OpenStack Neutron external-to-tenant network connectivity (deep technical)

Context: Multi-tenant OpenStack deployment needing to map external networks into tenant overlay networks beyond VLAN 4094 limit.

Key concepts researched and filed:

  • openstack-overlay-networks — VXLAN/GRE/GENEVE protocols, VNI allocation, OVS flow pipeline
  • openstack-external-network-mapping — Provider network → router namespace → overlay bridge architecture
  • openstack-dvr-architecture — DVR design, modes (dvr/dvr_snat/legacy), FIP namespace, IP consumption
  • openstack-floating-ip-nat — iptables DNAT/SNAT in qrouter namespace, centralized vs. DVR path
  • openstack-bgp-evpn-external — neutron-dynamic-routing, networking-bgpvpn, ovn-bgp-agent + FRR/EVPN

Pages touched: 5 permanent notes (mới), 1 literature note (mới), 1 MOC (mới), index.md (cập nhật)

Sources: OpenStack official docs (Neutron 25.x/28.x), Eran Gampel DVR blog, Red Hat DVR guide, networking-bgpvpn docs, ovn-bgp-agent docs, Red Hat EVPN/OpenShift article

Answer filed as permanent notes: YES (5 notes + MOC)

[2026-04-10] refactor | Migrate refs/ Batch 1 — DevOps core

Source files archived: DevOps.md, cicd.md, continuous_integration.md, continuous_delivery.md, continuous_deployment.md, sre.md, slsa.md, devops_topology.md, devops_pipelines_and_toolchains.md, continuous_exploration.md (empty — archived only)

Permanent notes created (9):

  • devops — DevOps culture, CI/CD relationship, SRE link
  • site-reliability-engineering — SRE vs DevOps, SLO/SLI/Error Budget
  • slsa — supply chain security framework, 4 levels
  • cicd — CI/CD as linked pair
  • continuous-integration — shift-left, CI vs CD vs Deployment comparison table
  • continuous-delivery — release-ready state, vs Continuous Deployment
  • continuous-deployment — fully automated pipeline to production, prerequisites
  • devops-topology — 9 beneficial topologies + 8 anti-types
  • devops-pipeline-stages — 9 stages, DevSecOps shift-left, feature flags

Pages touched: 9 permanent notes (mới), 10 refs/ files (archived), index.md (cập nhật)

[2026-04-10] refactor | Migrate refs/ Batch 2 — DORA + Flow metrics

Source files archived: The_DORA_KPI_metrics.md, mean_time_to_recovery.md, pirate_metrics.md, flow_framework.md, don_reinertsen_cost_of_delay.md, kingman_s_formular.md, little_s_law.md, TTM.md, feature_flag.md

Permanent notes created (9):

  • dora-metrics — 4 DORA metrics, velocity vs stability, elite/high/medium/low levels
  • mean-time-to-restore — MTTR definition, relationship với CFR trong DORA
  • pirate-metrics — AARRR framework, 5 customer lifecycle stages
  • flow-framework — 4 Flow Items, 5 Flow Metrics, SAFe mapping (Mik Kersten)
  • cost-of-delay — CoD concept, CD3 formula, Don Reinertsen
  • little-s-law — L = λW, WIP/throughput/cycle time relationship
  • kingmans-formula — VUT equation, utilization → wait time nonlinear growth
  • time-to-market — TTM vs Lead Time for Changes, 5 business challenges
  • feature-flag — deploy vs release separation, progressive rollout, kill switch

Pages touched: 9 permanent notes (mới), 9 refs/ files (archived), index.md (cập nhật)

[2026-04-10] refactor | Migrate refs/ Batch 3 — SAFe + Agile

Source files archived (15): safe.md, safe_pi.md, safe_enabler.md, safe_ip_iteration.md, safe_value_stream.md, safe_value_stream_mapping.md, safe_operational_value_stream.md, safe_metrics_in_value_stream_mapping.md, scaling_devops_with_safe.md, agile_manifesto.md, agile_art.md, agile_art_system_team.md, agile_cadence.md, CALMR.md, devops_transforation_canvas.md

Permanent notes created (13):

  • safe — SAFe framework, 4 core values, 10 principles, 4 configurations
  • safe-planning-interval — PI cadence, 8–12 weeks, ART delivery unit
  • safe-ip-iteration — IP iteration buffer, PI Planning, Inspect & Adapt
  • safe-enablers — 4 enabler types: Exploration, Architectural, Infrastructure, Compliance
  • safe-value-stream — Operational vs Development Value Stream; principle #10
  • value-stream-mapping — Lean VSM tool; PT/LT/%C&A metrics; waste identification
  • safe-agile-release-train — ART as team of teams; cross-functional; common cadence
  • safe-system-team — System Team as DevOps team of ART; CI/CD pipeline ownership
  • agile-manifesto — 4 values, 12 principles; SAFe context notes
  • agile-cadence — cadence vs sprint vs iteration; basis for PI synchronization
  • calmr — CALMR 5 pillars; evolution from CMAS → CALMS → CALMR
  • scaling-devops-with-safe — Essential SAFe, ART, RTE/PM/SA, 4 DevOps aspects
  • devops-transformation-canvas — 9-component workshop tool; current/future state VSM

Merges applied:

  • safe_operational_value_stream.md content merged into safe-value-stream.md
  • safe_metrics_in_value_stream_mapping.md content merged into value-stream-mapping.md

Pages touched: 13 permanent notes (mới), 15 refs/ files (archived), index.md (cập nhật)

[2026-04-10] refactor | Migrate refs/ Batch 4 — Leadership + Culture

Source files archived (12): ron_westrum_3_types_of_cultures.md, ron_westrum_generative_culture.md, ron_westrum_bureaucratic_culture.md, ron_westrum_pathological_culture.md, john_kotter_8_steps_driving_transform_of_a_culture.md, continuous_learning.md, clc_personal_mastery.md, clc_mental_models.md, clc_shared_vision.md, clc_system_thinking.md, clc_team_learning.md, follow_the_sun_model.md

Permanent notes created (3):

  • westrum-culture-typology — 3 culture types (Pathological/Bureaucratic/Generative); 6 reactions to anomalies; DORA link
  • continuous-learning-culture — CLC 3 dimensions; Senge’s 5 disciplines merged; SAFe Business Agility competency
  • kotter-8-step-change — 8 bước change management; urgency → coalition → vision → short-term wins → embed

Merges applied:

  • 4 Westrum files (3 stubs + main) → westrum-culture-typology.md
  • 6 CLC files (5 sub-disciplines + main) → continuous-learning-culture.md
  • clc_team_learning.md (empty stub) → archived only, no permanent note
  • follow_the_sun_model.md (empty stub) → archived only, no permanent note

Pages touched: 3 permanent notes (mới), 12 refs/ files (archived), index.md (cập nhật)

[2026-04-10] refactor | Migrate refs/ Batch 5 — ML + Math

Source files archived (8): machine_learning.md, supervised_learning.md, unsupervised_learning.md, k_means_clustering.md, naive_bayes_classifier.md, multinomial_distribution.md, overfitting.md, theory_of_constraints.md

Permanent notes created (5):

  • machine-learning — ML overview; supervised vs unsupervised; overfitting pointer (merged 3 files)
  • k-means-clustering — K-Means algorithm; centroid initialization; elbow method; local minima warning
  • naive-bayes-classifier — Bayes theorem; NBC algorithm; multinomial distribution merged in
  • overfitting-underfitting — generalization problem; causes; K-fold cross-validation
  • theory-of-constraints — 5 focusing steps; constraint thinking; links to VSM/Little’s Law/Kingman

Merges applied:

  • machine_learning + supervised_learning + unsupervised_learning → machine-learning.md
  • multinomial_distribution → merged into naive-bayes-classifier.md

Pages touched: 5 permanent notes (mới), 8 refs/ files (archived), index.md (cập nhật)

[2026-04-10] refactor | Migrate refs/ Batch 6 — Infra misc

Source files archived (1): Seekable_OCI.md

Permanent notes created (1):

  • seekable-oci — SOCI technology; lazy loading; SOCI index; AWS Fargate use case

Pages touched: 1 permanent note (mới), 1 refs/ file (archived), index.md (cập nhật)

[2026-04-10] refactor | Migrate writing/ — 12 permanent notes từ 9 cluster

Source files: writing/ (không archive — published content, read-only)

Permanent notes created (12):

  • resilience-vs-robustness — Robustness (MTBF) vs Resilience (MTTR); Cynefin; 4 Hollnagel capabilities; transition path to CD
  • tail-latency — P99 compound effect; latency outliers; percentile monitoring vs average
  • hedged-requests — Race multiple service instances; first-response wins; trade-offs và when to use
  • china-data-regulation — CSL/DSL/PIPL framework; Core/Important/General data classification; cross-border transfer rules
  • kubernetes-node-pool-design — Taint/toleration + affinity/anti-affinity; pool segregation by workload type; cost strategies
  • kubernetes-node-consolidation — Minimal node count; Cluster Autoscaler + overprovisioning; stateful/variable workload limitations
  • zero-trust-network-kubernetes — mTLS STRICT; Calico + Istio sidecar mode; Istio Ambient mode; identity-based not IP-based
  • container-runtime-security-falco — Syscall monitoring via kernel module; rule-based alerting; DevSecOps stack
  • multi-cloud-architecture — Private cloud primary + AWS secondary; K8s portability; GitOps; Portworx/Ceph storage
  • lossless-semantic-tree — Pre-test analysis methodology; zero-call verification; Mock Verification Pattern
  • ai-assisted-testing — LST as AI context; human+AI multiplier model; structured prompts for better coverage
  • software-architect-role — Developer vs Architect; trade-off decisions; cost-awareness; ADR; Architectural Knowledge Management

Pages touched: 12 permanent notes (mới), index.md (cập nhật), log.md (append)

[2026-04-10] refactor | migrate journal/ — 5 permanent notes from journal/ cluster

Source files: journal/ (không archive — legacy personal posts, read-only) Skipped: note_for_project_aws_development.md (link dump, no atomic concept), command_tips.md (tooling cheatsheet, not conceptual), f_the_people_who_do_not_add_blank_line_at_end_of_file.md (rant, no extractable concept), todo.md (1-line stub)

Permanent notes created (5):

  • system-design-patterns — 8 core patterns: consistent hashing, CAP theorem, sharding, caching strategies, CDN, partitioning, message queues, indexes
  • cassandra-kubernetes-ha — DC = AZ mapping; StatefulSet per AZ với nodeAffinity topology.kubernetes.io/zone; NetworkTopologyStrategy; seed nodes; Spot viable vì HA design
  • t-shaped-developer — I-shaped vs T-shaped; cross-functional Agile teams; benefits; path (học + thời gian + kiên nhẫn + chia sẻ)
  • aws-lambda-cold-start — Cold vs warm start lifecycle; 15-min execution context reuse; keep-alive HTTP, /tmp caching, move heavy objects outside handler
  • git-object-model — blob/tree/commit DAG; SHA-1 content addressing; refs/ + logs/ structure; recovery by copying objects/ into fresh clone

Pages touched: 5 permanent notes (mới), index.md (cập nhật), log.md (append)

[2026-04-10] ingest | Proxmox DBaaS Lab — Day 1 to Day 4.5

Source: /Users/sonht2.gmo/git/openstack-101/lab/proxmox-dbaas-lab/ (command packs + live journal) Owner emphasis: Trove + Swift + PG HA replication, Kolla-Ansible real incidents, OVS bridge pitfall

Permanent notes created (7):

  • kolla-ansible-deployment-patterns — hostname resolution trap (127.0.1.1 / Erlang); RAM requirements; nova cell_v2 discover_hosts; kolla_toolbox snapshot gotcha
  • ovs-bridge-management-nic-pitfall — OVS L2 takeover làm mất SSH; recovery via Proxmox noVNC; rule provider NIC only
  • openstack-provider-net-routing — static route từ tools-1 qua ctrl-1; gateway IP phải trên br-ex, không raw NIC; no floating IP pattern
  • packer-openstack-image-pipeline — Packer + OpenStack plugin; use_floating_ip=false; image lifecycle candidate→approved; Glance metadata tagging
  • openstack-trove-guest-agent-connectivity — OVN logical IP vs Linux IP boundary; RabbitMQ dual listener; DNAT Keystone; SNAT internet; subnet gateway phải dùng br-ex IP
  • openstack-trove-postgresql-ha — primary/replica via —replica-of; Swift mandatory; security group không auto-attach replica; backup_docker_image explicit; trove-guestagent.conf immutable; failover timeline 2 limitation
  • swift-single-node-setup-kolla — loopback disk; GPT label KOLLA_SWIFT_DATA; XFS label d0; ring builder part_power=10 replicas=1; swap prerequisite; systemd persistence

Literature note created (1):

  • proxmox-dbaas-lab-day1-to-day4.5 — summary toàn bộ lab experience với 5+ incidents documented

Pages touched: 7 permanent notes (mới), 1 literature note (mới), index.md (cập nhật), log.md (append)

[2026-04-10] ingest | PostgreSQL HA — Patroni + pgpool-II on Ubuntu

Source: https://medium.com/@joaovic32/demystifying-high-availability-postgresql-with-patroni-and-pgpool-ii-on-ubuntu-428c91a55b1a

Key concepts added:

  • patroni — HA orchestrator dùng Raft consensus qua etcd; automatic failover; REST API health check
  • pgpool-ii — connection proxy: pooling, read load balancing, write routing; sr_check awareness
  • postgresql-ha-patroni-pgpool-combo — combined pattern; phân chia trách nhiệm không overlap; so sánh với Trove HA

Permanent note updated (1):

  • openstack-trove-postgresql-ha — thêm link so sánh sang postgresql-ha-patroni-pgpool-combo

Pages touched: 3 permanent notes (mới), 1 permanent note (updated), 1 literature note (mới), index.md (cập nhật), log.md (append)

[2026-04-11] ingest | Nhà Minh — tài chính sụp đổ (research tổng hợp)

Source: research tổng hợp từ nhiều nguồn học thuật (Ray Huang, Flynn & Giráldez, Von Glahn, Atwell)

Key concepts added:

  • ming-tax-base-erosion — guiji (詭寄)/touxian (投獻); scale: đất chịu thuế giảm ~50% trong 140 năm; Single Whip Reform và giới hạn cơ cấu
  • ming-silver-inflation — Manila Galleon; arbitrage bạc toàn cầu; bẫy Nhất điều tiên; cú sốc kép 1630s; tranh luận Atwell vs. Von Glahn

Fleeting note updated (1):

  • 2026-04-11-minh-trieu-tai-chinh-sup-do — thay [!warning] bằng [!info] promoted, link sang 2 permanent notes

Pages touched: 2 permanent notes (mới), 1 fleeting note (updated), index.md (cập nhật), log.md (append)

[2026-04-25] capture | Gươm / Kiếm / Đao — Taxonomy vũ khí lạnh Đại Việt

Key concepts added: guom-kiem-dao-vu-khi-dai-viet Pages touched: 1 permanent note (mới), index.md (cập nhật)

Highlights:

  • Đao (刀) = single-edged broad curved → 1:1 với Chinese dao; không nhầm lẫn
  • Chinese jian (劍) → bifurcation trong tiếng Việt: kiếm (thẳng 2 lưỡi) + gươm (cong 1 lưỡi)
  • Gươm từ nguyên: Proto-Vietic *t-kɨəm ← Old Chinese 劍 *s.kr[a]m-s; tiền âm tiết *t- → lenition /k/→/ɣ/; bằng chứng: tiếng Rục “təkɨəm”
  • Kiếm = âm Hán-Việt (mượn thời Đường+); gươm = âm Việt cổ (mượn sớm hơn)
  • Trực-Kiếm Đại Việt: mũi vếch Câu-Kiếm-Phong — đặc thù không thấy ở jian TQ hay tachi Nhật
  • Biến thể vùng: Bắc (TQ), Trung (Nhật+ĐNA), Nam (Cham/Khmer/Xiêm), thế kỷ 19 (+Pháp)
  • Hồ Gươm + Gươm Thần Thuận Thiên: gươm = từ dân gian gần gũi hơn kiếm trong văn hóa
  • Nguồn học thuật chính: Vetyukov V. (2015), WHJ №2, pp.12–27

[2026-04-25] capture | Y Bát (衣鉢) — thuật ngữ Phật giáo

Key concepts added: y-bat Pages touched: 1 permanent note (mới), index.md (cập nhật)

Highlights:

  • Y bát = áo cà sa (y) + bình bát (bát) — biểu tượng giới luật, truyền thừa, giản dị
  • Kế thừa y bát: nghi thức trao truyền từ thầy sang trò — 3 lớp ý nghĩa: chánh pháp, lãnh đạo Tăng đoàn, tâm ấn thiền tông
  • Thiền tông: câu chuyện Huệ Năng — Hoằng Nhẫn là ví dụ kinh điển nhất
  • Ngoài đạo Phật: kế thừa tinh thần/phong cách/di sản của người thầy trong mọi lĩnh vực

[2026-04-11] ingest | Tứ giác nước — mô hình đô thị sông nước Việt Nam (research so sánh)

Source: Research session — Wikipedia tiếng Việt (Tứ giác nước), TS Lê Vĩnh An (Tạp chí Kiến trúc 01-2025), GS Trần Quốc Vượng, TU Delft (Chang’an water systems), Wikipedia EN (Bern, Metz, Nanjing, Beijing, London, Rome)

Key concepts added:

  • tu-giac-nuoc — định nghĩa, các kinh đô VN tiêu biểu, bốn chức năng; so sánh với 背山面水 Trung Quốc và mô hình 1 mặt sông châu Âu; các analog châu Âu (Bern, Metz, Wrocław, Koblenz)

Pages touched: 1 permanent note (mới), 1 literature note (mới), index.md (cập nhật), log.md (append)

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