Coldwast wrote
Jul 1, 2026 in Programming, Concepts, Performance - Concurrency is structuring a program to deal with many tasks at once by interleaving them; parallelism is running many tasks at the same instant on multiple cores. The core distinction, Rob Pike's framing, threads vs async, Python (GIL) and Haskell examples, when each matters, and pitfalls.
Read more…Coldwast wrote
Jun 27, 2026 in Programming, DevOps, Containers - Docker runs containers through a central daemon; Podman is daemonless and rootless by design. They share OCI images and a near-identical CLI. Architecture, rootless security, pods, systemd, Compose and Docker Desktop licensing compared.
Read more…Coldwast wrote
Jun 26, 2026 in Programming, Servers, Networking - A load balancer spreads incoming requests across several servers so none gets overwhelmed and the app stays up if one fails. What a load balancer is, the algorithms, L4 vs L7, health checks, and how it differs from a reverse proxy.
Read more…Coldwast wrote
Jun 26, 2026 in Programming, Web, Networking - A WebSocket keeps one connection open so the server and browser can send messages to each other at any time. What a WebSocket is, how it differs from HTTP, the handshake, ws vs wss, and when to use it instead of polling.
Read more…Coldwast wrote
Jun 26, 2026 in Programming, Servers, Networking - A reverse proxy sits in front of your servers, takes every incoming request and forwards it to the right backend. What a reverse proxy is, how it differs from a forward proxy and a load balancer, why you use one (TLS, caching, routing), and the common tools.
Read more…Coldwast wrote
Jun 24, 2026 in Programming, Concepts, Haskell - A higher-order function takes a function as an argument or returns one as its result. What higher-order functions are, why map, filter and fold are the classic examples, how they replace loops, and how they work in Haskell.
Read more…Coldwast wrote
Jun 23, 2026 in Programming, Concepts, Compiler - A compiler turns the source code you write into a program the machine can run. What a compiler is, how it works stage by stage (lexing, parsing, optimization, code generation), compiler vs interpreter, and where GHC fits for Haskell.
Read more…Coldwast wrote
Jun 22, 2026 in Programming, DevOps, Automation - CI/CD automates the path from a code change to a tested, deployed app. What continuous integration and delivery/deployment mean, how a pipeline works, the common tools, and why teams rely on it.
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Jun 22, 2026 in Programming, Servers, Security - SSH (Secure Shell) is the encrypted protocol you use to log in to and run commands on a remote server safely. How the handshake and keys work, passwords vs SSH keys, the everyday commands, and where you meet it.
Read more…Coldwast wrote
Jun 19, 2026 in Programming, Hosting, Infrastructure - A VPS is your own isolated slice of a physical server, with dedicated resources and full root access. How virtualization works, VPS vs shared/dedicated/cloud, managed vs unmanaged, and what you use one for.
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Jun 19, 2026 in Programming, DevOps, orchestration - Kubernetes is an open-source system that runs and coordinates containers across many machines - scheduling, scaling, healing and networking them. The core concepts (pod, node, cluster, deployment, service), how it relates to Docker, and when you actually need it.
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Jun 19, 2026 in Programming, DevOps, containers - Docker packages an application and everything it needs into a container that runs the same way on any machine. Containers vs virtual machines, the key concepts (image, container, Dockerfile, registry), and Docker vs Kubernetes.
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GHC, Cabal, Stack and HLS in one clean setup with GHCup.
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Sandboxes, nix-style v2-builds and what actually changed.
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Use every core safely with -j and build semaphores.
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