FreePeak Labs https://freepeak.github.io/ Recent content on FreePeak Labs FreePeak Labs https://FreePeak.github.io/images/freepeak-labs-cover.png https://FreePeak.github.io/images/freepeak-labs-cover.png Hugo -- 0.167.0 en Sun, 11 Oct 2026 22:00:00 +0700 xdev from day one: 743 commits, 33 days, and what actually shipped https://freepeak.github.io/posts/xdev-from-day-one-to-where-it-is-now/ Sun, 11 Oct 2026 22:00:00 +0700 https://freepeak.github.io/posts/xdev-from-day-one-to-where-it-is-now/ A full retrospective on building xdev: 743 commits in 33 days, milestone table M0-M15, what a turn actually does, the Telegram gateway, and the process rules that survived contact with real daily use. xdev: how I built a lightweight and fast agent coding CLI https://freepeak.github.io/posts/xdev-how-i-built-a-lightweight-and-fast-agent-coding-cli/ Wed, 16 Sep 2026 15:49:05 +0700 https://freepeak.github.io/posts/xdev-how-i-built-a-lightweight-and-fast-agent-coding-cli/ Seven days rewriting a coding agent harness in Go: one 20MB binary, ~16MB idle RSS, 4 core tools, a system prompt under 1000 tokens. Real numbers, real bugs, and the things I deliberately did not build. xdev: how I wrote a lightweight, fast agent coding CLI https://freepeak.github.io/posts/xdev-cach-toi-viet-agent-coding-cli-nhe-va-nhanh/ Wed, 16 Sep 2026 14:01:03 +0700 https://freepeak.github.io/posts/xdev-cach-toi-viet-agent-coding-cli-nhe-va-nhanh/ Seven days rewriting a coding agent harness in Go: one 20MB binary, ~16MB idle RSS, 4 core tools, a system prompt under 1000 tokens. Real numbers, real bugs, and the things I deliberately did not build. EJBCA + GCP Cloud KMS: A Practical Installation and Configuration Guide https://freepeak.github.io/posts/ejbca-gcp-kms-huong-dan-cai-dat/ Thu, 05 Feb 2026 21:51:59 +0700 https://freepeak.github.io/posts/ejbca-gcp-kms-huong-dan-cai-dat/ Step-by-step integration of EJBCA Community Edition with GCP Cloud KMS using the PKCS#11 library, including the generate_certs configuration and testing. HSM: The Physical Fortress for Digital Secrets https://freepeak.github.io/posts/hsm-concept-definition/ Tue, 27 Jan 2026 10:00:00 +0700 https://freepeak.github.io/posts/hsm-concept-definition/ An HSM is not just faster crypto hardware. It is a physical fortress where a private key is born, survives, and destroys itself if tampered with. A deep dive into FIPS 140-2, True Random Number Generators (TRNG) and side-channel attacks. How to Use AI Agent Coding Tools Effectively with Skills.sh https://freepeak.github.io/posts/cach-su-dung-ai-agent-coding-tool-hieu-qua-voi-skills-sh/ Wed, 21 Jan 2026 10:00:00 +0700 https://freepeak.github.io/posts/cach-su-dung-ai-agent-coding-tool-hieu-qua-voi-skills-sh/ A practical guide to getting real value from AI agent coding tools and the Skills.sh ecosystem HSM and the 3-of-5 Signing Ritual: Turning Code Signing From a Script Into a Process https://freepeak.github.io/posts/hsm-3-tren-5-ky-so-firmware-yubihsm2/ Wed, 21 Jan 2026 10:00:00 +0700 https://freepeak.github.io/posts/hsm-3-tren-5-ky-so-firmware-yubihsm2/ A pragmatic look at putting an HSM into a firmware signing system: choosing a model, the key lifecycle, and why 3-of-5 cuts risk without slowing releases down. Why We Work https://freepeak.github.io/posts/chung-ta-di-lam-vi-dieu-gi/ Wed, 21 Jan 2026 00:00:00 +0000 https://freepeak.github.io/posts/chung-ta-di-lam-vi-dieu-gi/ <h2 id="about-money">About money</h2> <p>Thông báo lương về lúc 9:03 sáng.</p> <p>Một cái rung nhẹ, một dòng số nhảy lên, và tự nhiên cả tuần tôi biết cười lịch sự hơn. Tôi hay gọi đó là “tiền an thần”: nó không làm mình thông minh hơn, nhưng làm mình dễ để yên những câu hỏi khó.</p> <p>Tôi biết sai vẫn làm.</p> <p>Cái sai ở đây không phải là “đi làm” (đi làm có gì sai). Cái sai là cái khoảnh khắc mình giả bộ như không có giao dịch nào đang xảy ra: mình đưa 8 tiếng mỗi ngày, đổi lại một phần an tâm.</p> MySQL Index: The Path a Query Takes (Written for Backend Developers) https://freepeak.github.io/posts/mysql-index-duong-di-cho-query/ Tue, 20 Jan 2026 00:00:00 +0700 https://freepeak.github.io/posts/mysql-index-duong-di-cho-query/ An index is not a speed-up charm. It is a path. How MySQL actually uses indexes, from a backend developer point of view: designing indexes for real queries, the anti-patterns you hit, and a checklist you can apply. Architecture and Best Practices: Running Kong Open Source as an API Gateway on GKE https://freepeak.github.io/posts/kong-opensource-k8s-gcp/ Mon, 19 Jan 2026 10:00:00 +0700 https://freepeak.github.io/posts/kong-opensource-k8s-gcp/ A deep dive into the architecture and best practices for deploying Kong Open Source as an API gateway and ingress controller on Google Kubernetes Engine (GKE). Kong DB-less on AWS EKS: Per-Tenant Rate Limiting, and Why ALB Ingress Is Not Enough https://freepeak.github.io/posts/kong-eks-aws-rate-limit-tenant/ Mon, 19 Jan 2026 10:00:00 +0700 https://freepeak.github.io/posts/kong-eks-aws-rate-limit-tenant/ A pragmatic look at running Kong DB-less on AWS EKS for per-tenant rate limiting: why ALB Ingress, WAF and Lambda quickly turn into duct tape, plus the best practices for running Kong lean, safe and easy to scale. Lock In VPC CIDR Early: A Small Decision That Prevents Tearing It All Down Later https://freepeak.github.io/posts/chot-vpc-cidr-tu-som/ Mon, 19 Jan 2026 10:00:00 +0700 https://freepeak.github.io/posts/chot-vpc-cidr-tu-som/ Why choosing a VPC CIDR early matters: real-world experience on how CIDR decisions shape AWS infrastructure growth, and how to govern CIDR effectively with Terragrunt. Using AI Coding Agents as a Developer: A 2026 Field Report https://freepeak.github.io/posts/hanh-trinh-su-dung-ai-agents/ Sun, 18 Jan 2026 10:00:00 +0700 https://freepeak.github.io/posts/hanh-trinh-su-dung-ai-agents/ Hands-on experience with AI coding agents: Cursor, Copilot, Claude Code and more - strengths, weaknesses, and how to pick the right tool for the job. Tags https://freepeak.github.io/tags/ Mon, 01 Jan 0001 00:00:00 +0000 https://freepeak.github.io/tags/ tags