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How two processes can communicate in one device using IPC Simple way we can use shared file, you can use a client <-> server, but that involve you are need to setup port, sending and serializing data. What if you want your processes to be independent, to communicate, and yet not distribute some arcane shell scripts along with them? It turns out that other...

DNS tcpdump by example analyze traffic of DNS is a easier and fun practice because it has no encryption, unlike HTTPS or SSH. So you can actually look at the payload. In this article we will walk through th exercise to analyze this traffic of querying a DNS end to end, what happen, where do they get their data. Knowing this knowledge will put...

Slack Journey Migrating to AWS IMDSv2 Have you ever query 169.254.169.254 you deal with AWS IDMS service. Anyone can query that from an EC2 instance. In 2019, they release IMDSv2, which require a token so it’s more secure. Slack running 60,000 AWS instance. How can they roll this out safely across the fleet of services on all these 60,000 server to use IDMSv2

Calculus made easy With all the trend about LLM, maybe time to dust up our math skill in high school.

Rebuilding Tables online using pg_repack in PostgreSQL Any database engine, including PostgreSQL, requires some routine maintenance to ensure optimal performance. Especially when there are massive delete or purge operations to delete rows from a Table, the fragmentation builds up within a table. Reclaim this fragmented space from disk requires a table to be rebuilt

hyperformula an open-source headless spreadsheet for business web apps. It comes with over 400 formulas, CRUD operations, undo-redo, clipboard support, and sorting. Built in TypeScript, supported by the Handsontable Team

validates_email_format_of Validate e-mail addreses against RFC 2822 and RFC 3696 with this Ruby on Rails plugin and gem.

wedges An ever-expanding, open-source React UI library built with the Wedges Design System, Radix primitives, and Tailwind CSS.

litellm Call all LLM APIs using the OpenAI format. Use Bedrock, Azure, OpenAI, Cohere, Anthropic, Ollama, Sagemaker, HuggingFace, Replicate (100+ LLMs)

pgxman package manager for PostgreSQL extensions, along with a repository of packages. It integrates with native build systems for installation.

The Simple Beauty of XOR Floating Point Compression I recently implemented a small program to visualize the inner workings of a scheme that compresses floating point timeseries by XORing subsequent values. The resulting visualizations are quite neat and made it much easier for me to understand this beautiful algorithm than any of the explanations that I had previously encountered.

A simple query with a big problem Render.com staging pipeline got blocked due to what looked like a simple query SELECT e.id FROM events e JOIN postgres_dbs db ON (e.data ->> ‘serviceId’) = db.database_id LIMIT 1; Can you spot what’s wrong? Let’s read

How macOS opens a file in the correct app One of feature of Mac is it can detect the right app to open a file, even without a file extension. How did it works and how it evolve

Can You Grok It – Hacking together my own dev tunnel service Lets learn how to re-create a service similar to ngrok by re-using existing software such as nginx and openssh. There is also a great repository for these tunneling softwares

crystal ruby a gem that allows you to write Crystal code, inlined in Ruby. All you need is a modern crystal compiler installed on your system.

PythonMonkey A Mozilla SpiderMonkey JavaScript engine embedded into the Python VM, using the Python engine to provide the JS host environment.

madge is a developer tool for generating a visual graph of your module dependencies, finding circular dependencies, and giving you other useful info.

Using Multiple GitHub Accounts If you share laptop for home and work, or doing consultant for clients, you probably know the hassle of using different github account. This short guide help you configure just that, to make your life easiser by having git automatically load the right account based on directory.

automq a cloud-native, serverless reinvented Kafka that is easily scalable, manage-less and cost-effective. It uses Object storage(s3, gcs) as the main storage. Using EBS for durable cache layer to accelerate write. It’s 100% compatible with Apache Kafka greater than 0.9.x and not lose any good features of it, but cheaper and better.