Docker’s networking model allows containers to communicate with each other, with the host, and with external networks in a controlled, isolated manner. Docker creates three default networks: bridge (the default for standalone containers), host (shares the host’s network namespace — maximum performance, no isolation), and none (no networking). For production applications, custom bridge networks provide […]
Docker containers are ephemeral by default — all data written inside a container is lost when the container is removed. Docker provides two mechanisms for persisting data and sharing files between containers and the host: volumes (managed by Docker, stored in /var/lib/docker/volumes/) and bind mounts (map a host directory directly into a container). Volumes are […]
Docker Compose is a tool for defining and running multi-container Docker applications from a single YAML configuration file (docker-compose.yml or compose.yaml). Instead of manually running multiple docker run commands and configuring networks and volumes by hand, Docker Compose allows you to declare all services (web application, database, cache, message queue) in one file and start […]
Docker Engine is the industry-standard container platform that packages applications and their dependencies into portable, isolated containers. A Docker container bundles the application code, runtime, libraries, and configuration into a single image that runs identically on any Linux host with Docker installed, eliminating the “it works on my machine” problem. RHEL 9 does not include […]
Deno is a modern JavaScript and TypeScript runtime built on V8 and Rust. Created by Ryan Dahl (the original creator of Node.js), Deno addresses design decisions he regretted in Node.js: Deno has first-class TypeScript support with no build step required, uses ES modules exclusively (no CommonJS), has a secure-by-default permissions model (scripts cannot access the […]
.NET is Microsoft’s open-source, cross-platform application framework that runs on Linux, macOS, and Windows. .NET 8 (the current LTS release) includes the ASP.NET Core web framework for building REST APIs and web applications, Entity Framework Core ORM, and a high-performance Kestrel HTTP server. .NET applications are compiled to platform-independent intermediate language (IL) bytecode and run […]
Ruby on Rails (Rails) is a full-stack web application framework built on Ruby that made convention-over-configuration and the MVC pattern mainstream in web development. Rails provides ActiveRecord (ORM), ActionController (routing and controllers), ActionView (templating with ERB/Haml), ActionMailer, ActiveJob (background jobs), ActionCable (WebSockets), and a comprehensive set of security defaults out of the box. A Rails […]
Ruby is a dynamic, object-oriented programming language best known as the language behind Ruby on Rails, the influential web framework that popularised convention-over-configuration and RESTful web applications. rbenv is the standard Ruby version manager for production servers — it allows installing and switching between multiple Ruby versions per user or per directory, without requiring root […]
Rust is a systems programming language focused on memory safety, performance, and concurrency. Rust achieves memory safety without a garbage collector through its ownership and borrowing system, which enforces at compile time that there are no dangling pointers, buffer overflows, or data races. This makes Rust suitable for building high-performance systems software where both safety […]
Go’s standard library includes a production-ready HTTP server with support for HTTP/2, TLS, and concurrent request handling — no external framework is required for simple web applications. For more complex applications, the Gin framework adds routing, middleware, request binding, and response rendering while maintaining excellent performance. Go web applications compile to a single binary, making […]
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