Efficient Docker image and container management is fundamental to maintaining a healthy container environment. Docker images accumulate on hosts — old base images, build cache layers, and unused intermediate images can consume tens of gigabytes of disk space if not managed regularly. Understanding the Docker image layer model is key: images consist of read-only layers […]
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 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 […]
Go (Golang) is a statically typed, compiled systems programming language developed by Google. Its primary design goals are simplicity, fast compilation, and excellent concurrency support through goroutines and channels. Go compiles to a single statically linked binary with no runtime dependencies — deploying a Go application means copying a single binary to the target server. […]
Spring Boot is the most widely used Java web framework, providing an opinionated, auto-configured platform for building standalone, production-ready applications. Spring Boot embeds an HTTP server (Tomcat, Jetty, or Undertow) directly in the application JAR, eliminating the need for a separate application server deployment. A Spring Boot application is packaged as an executable “fat JAR” […]
PM2 is a production-grade process manager for Node.js applications. Running a Node.js app directly with node server.js has a critical limitation: if the process crashes, it stays down until someone manually restarts it. PM2 solves this and much more — it automatically restarts crashed processes, starts applications on system boot, enables zero-downtime reloads for application […]
Python virtual environments solve a fundamental dependency management problem: different projects require different versions of the same library, and installing everything system-wide leads to version conflicts. A virtual environment is a self-contained directory containing a Python interpreter copy and a site-packages directory isolated from the system Python. Each project gets its own virtual environment with […]
Python 3 is the most widely used language for web development, data science, machine learning, automation, and DevOps tooling. RHEL 9 ships with Python 3.9 by default, but newer versions (3.11, 3.12) are available from the AppStream repository and provide significant performance improvements — CPython 3.11 is 10–60% faster than 3.10 for most workloads. The […]
Laravel is the most popular PHP web application framework, providing an expressive, MVC-based structure with built-in features including Eloquent ORM, Blade templating, database migrations, queues, events, broadcasting, and the Artisan CLI. Laravel follows convention-over-configuration to reduce boilerplate and accelerates development with scaffolding tools like Breeze (authentication starter kit) and Jetstream. This guide covers creating a […]
PHP is the dominant server-side scripting language powering WordPress, Laravel, Drupal, Magento, and thousands of other web applications. RHEL 9 ships with PHP 8.1 by default, but the Remi repository provides the latest PHP releases including PHP 8.3. PHP 8.3 introduced typed class constants, new json_validate() function, and further performance improvements over PHP 8.2. The […]
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