https://hanhpp.github.io/Recent content on Hanh Pham's BlogHugoen-usTue, 08 Sep 2026 09:30:00 +0700https://hanhpp.github.io/posts/tmux-pane-window-management/Tue, 08 Sep 2026 09:30:00 +0700https://hanhpp.github.io/posts/tmux-pane-window-management/Most tmux guides dump the whole key table on you. These are the pane and window bindings that survive contact with a real workday: splits, navigation, layout, and the marked-pane tricks tmux never bound for you.https://hanhpp.github.io/posts/huawei-ascend-950-davinci-v3/Mon, 07 Sep 2026 09:00:00 +0700https://hanhpp.github.io/posts/huawei-ascend-950-davinci-v3/DeepSeek just ordered 160,000 Huawei Ascend 950DT chips: a chip built on a DUV-only process, with self-developed HBM and a homegrown interconnect, because export controls left no other choice. Here’s how the thing actually works, and where it still falls short.https://hanhpp.github.io/posts/sql-server-trustworthy-rollback-xact-abort/Sun, 06 Sep 2026 11:00:00 +0700https://hanhpp.github.io/posts/sql-server-trustworthy-rollback-xact-abort/When one step in a multi-step SQL Server script fails, what actually happens to your data depends entirely on how you’ve wired up error handling, and the default is not what most people assume. Three scenarios, measured with real ledger output.https://hanhpp.github.io/posts/sql-server-wildcard-joins-and-unpivot/Sat, 05 Sep 2026 10:30:00 +0700https://hanhpp.github.io/posts/sql-server-wildcard-joins-and-unpivot/A join rule that matches ‘anything’ looks like an ordinary filter, until it quietly multiplies your row count. Measured, not estimated: what a wildcard join actually costs, why a CREATE INDEX line doesn’t always buy you a seek, and why UNPIVOT beats a ten-way OR chain.https://hanhpp.github.io/posts/go-1-27-is-quietly-load-bearing/Fri, 04 Sep 2026 10:00:00 +0700https://hanhpp.github.io/posts/go-1-27-is-quietly-load-bearing/Generic methods finally landed, json/v2 is already running underneath your code, and the allocator got faster while you weren’t looking. Six of this release’s changes take effect without you opting in; here’s which ones will cost you an afternoon.https://hanhpp.github.io/posts/microservices-designing-an-order-workflow/Thu, 03 Sep 2026 09:30:00 +0700https://hanhpp.github.io/posts/microservices-designing-an-order-workflow/Boundaries, communication styles, technology, and sagas all sound reasonable in isolation. Here’s what it looks like to actually apply all four decisions to one real workflow, in order.https://hanhpp.github.io/posts/how-ai-actually-fits-into-my-dev-workflow/Wed, 02 Sep 2026 10:00:00 +0700https://hanhpp.github.io/posts/how-ai-actually-fits-into-my-dev-workflow/“Agentic” gets thrown around loosely, but it means something specific: an assistant that decides its own next step instead of waiting for yours. That’s also exactly why you can’t trust it to tell you when it’s done a good job; here’s the verification habit that fixes that.https://hanhpp.github.io/posts/microservices-sagas-vs-two-phase-commit/Tue, 01 Sep 2026 10:00:00 +0700https://hanhpp.github.io/posts/microservices-sagas-vs-two-phase-commit/Splitting a monolith means splitting its database transactions too. The instinct is to reach for a distributed transaction. Here’s why that instinct is usually wrong, and what to do instead.https://hanhpp.github.io/posts/how-i-started-learning-reverse-engineering/Sat, 29 Aug 2026 15:00:00 +0700https://hanhpp.github.io/posts/how-i-started-learning-reverse-engineering/I spent my first month with Ghidra staring at assembly I didn’t understand, convinced I was too stupid for this. Here’s the honest version of how I got from ‘what is a register’ to solving CTF reversing challenges, and the mistakes that cost me weeks.https://hanhpp.github.io/posts/anti-debugging-tricks/Thu, 27 Aug 2026 11:00:00 +0700https://hanhpp.github.io/posts/anti-debugging-tricks/Some binaries detect that you’re debugging them and crash, change behavior, or hide the flag. This post covers the common anti-debugging techniques and how to bypass them.https://hanhpp.github.io/posts/custom-vms-in-ctf/Tue, 25 Aug 2026 10:00:00 +0700https://hanhpp.github.io/posts/custom-vms-in-ctf/Some CTF reversing challenges hide the flag behind a custom virtual machine: a program that interprets its own bytecode. This post shows you how to spot them, reverse the instruction set, and write a solver.https://hanhpp.github.io/posts/your-first-crackme-walkthrough/Sat, 22 Aug 2026 14:00:00 +0700https://hanhpp.github.io/posts/your-first-crackme-walkthrough/A crackme is a small binary that asks for a password and checks your input. This post walks through solving one, from downloading the binary to extracting the flag, with every tool click explained so you can follow along.https://hanhpp.github.io/posts/microservices-picking-communication-tech/Thu, 20 Aug 2026 09:30:00 +0700https://hanhpp.github.io/posts/microservices-picking-communication-tech/The communication style (sync/async, request-response/event-driven) narrows the field. Here’s how the actual technologies stack up once you’re choosing among them.https://hanhpp.github.io/posts/ghidra-in-30-minutes/Tue, 18 Aug 2026 11:00:00 +0700https://hanhpp.github.io/posts/ghidra-in-30-minutes/Ghidra’s decompiler turns machine code into something that looks like C. But the output is full of strange variable names, weird casts, and functions that look nothing like what you’d write. Here’s how to read it anyway.https://hanhpp.github.io/posts/debugging-microservices-where-did-that-request-go/Sat, 15 Aug 2026 10:30:00 +0700https://hanhpp.github.io/posts/debugging-microservices-where-did-that-request-go/In a monolith, a stack trace tells you what went wrong. In microservices, you’re grepping across three services’ logs at 2 AM trying to figure out which one lost the request. Here’s how to make that possible instead of painful.https://hanhpp.github.io/posts/microservices-versioning-without-breaking-everyone/Thu, 13 Aug 2026 15:00:00 +0700https://hanhpp.github.io/posts/microservices-versioning-without-breaking-everyone/In a monolith, renaming a field means updating all callers in one commit. In microservices, consumers upgrade on their own schedule, so your API has to evolve without breaking the ones that haven’t upgraded yet. Here’s how.https://hanhpp.github.io/posts/microservices-local-dev-without-docker-compose-hell/Tue, 11 Aug 2026 10:00:00 +0700https://hanhpp.github.io/posts/microservices-local-dev-without-docker-compose-hell/You split the monolith into twelve services. Now a new developer’s first week is spent getting Docker Compose to run all twelve on their laptop, and half of them crash because of a port conflict. Here’s how to make local development work without the pain.https://hanhpp.github.io/posts/microservices-deploying-without-the-fear/Sat, 08 Aug 2026 14:00:00 +0700https://hanhpp.github.io/posts/microservices-deploying-without-the-fear/In a monolith, deploy means pushing one thing. In microservices, every service deploys independently, which is the whole point, until you realize that ‘independently’ also means ‘without knowing what the other services are doing right now.’https://hanhpp.github.io/posts/microservices-database-per-service/Thu, 06 Aug 2026 09:30:00 +0700https://hanhpp.github.io/posts/microservices-database-per-service/Each service owns its database. That’s the rule. But when a report needs data from four services, or a customer wants to see their complete order history, you’ve got a query problem that a single SELECT can’t solve. Here’s how to handle it.https://hanhpp.github.io/posts/microservices-service-mesh-when-you-actually-need-one/Tue, 04 Aug 2026 11:00:00 +0700https://hanhpp.github.io/posts/microservices-service-mesh-when-you-actually-need-one/A service mesh gives you mTLS, traffic management, and observability without changing application code. It also gives you another piece of infrastructure to operate, debug, and explain to new hires. Here’s how to tell whether the trade-off is worth it.https://hanhpp.github.io/posts/go-performance-profiling-with-pprof/Sat, 01 Aug 2026 10:00:00 +0700https://hanhpp.github.io/posts/go-performance-profiling-with-pprof/Your Go service is slow, but you don’t know where. Guessing is not a strategy. pprof tells you exactly where your program spends its time, memory, and CPU; here’s how to use it.https://hanhpp.github.io/posts/microservices-five-ways-to-talk/Thu, 30 Jul 2026 10:00:00 +0700https://hanhpp.github.io/posts/microservices-five-ways-to-talk/Before picking REST, gRPC, or Kafka, you need to answer a more basic question: does this interaction block, and does the caller expect an answer? Get that wrong and no technology choice saves you.https://hanhpp.github.io/posts/microservices-boundaries-coupling-cohesion/Tue, 28 Jul 2026 10:00:00 +0700https://hanhpp.github.io/posts/microservices-boundaries-coupling-cohesion/Before you draw a single service boundary, you need a vocabulary for why some splits age well and others turn into a distributed monolith. Coupling and cohesion are that vocabulary.https://hanhpp.github.io/posts/should-you-even-use-microservices/Sat, 25 Jul 2026 10:00:00 +0700https://hanhpp.github.io/posts/should-you-even-use-microservices/Microservices are a solution to organizational scaling problems, not a technology choice. Here’s how to tell whether you actually have the problem they solve, before you pay the cost.https://hanhpp.github.io/about/Fri, 24 Jul 2026 00:00:00 +0700https://hanhpp.github.io/about/Who am I and what do I do?https://hanhpp.github.io/contact/Fri, 24 Jul 2026 00:00:00 +0700https://hanhpp.github.io/contact/Get in touch.https://hanhpp.github.io/posts/caching-geospatial-queries-without-a-geo-database/Thu, 23 Jul 2026 15:00:00 +0700https://hanhpp.github.io/posts/caching-geospatial-queries-without-a-geo-database/You don’t need PostGIS or a geohash library to cache repeat road-distance lookups: rounding coordinates and a unique index gets you most of the win.https://hanhpp.github.io/posts/self-hosting-a-routing-engine/Tue, 21 Jul 2026 14:00:00 +0700https://hanhpp.github.io/posts/self-hosting-a-routing-engine/Road distance, not straight-line distance, is what travel expense claims and delivery pricing actually need, here’s how to get it without a metered maps API.https://hanhpp.github.io/posts/using-images-and-shortcodes/Sat, 18 Jul 2026 11:00:00 +0700https://hanhpp.github.io/posts/using-images-and-shortcodes/Keeping a post and its images together with Hugo page bundles, plus the built-in figure shortcode.https://hanhpp.github.io/posts/hugo-code-blocks-demo/Thu, 16 Jul 2026 10:00:00 +0700https://hanhpp.github.io/posts/hugo-code-blocks-demo/Hugo ships with built-in syntax highlighting via Chroma, no plugins required.https://hanhpp.github.io/posts/welcome-to-my-blog/Tue, 14 Jul 2026 09:00:00 +0700https://hanhpp.github.io/posts/welcome-to-my-blog/A quick hello and a look at how this site is put together.