Kubernetes is the industry-standard container orchestration platform for automating deployment, scaling, and management of containerised applications across clusters of servers. While Kubernetes is typically set up using managed services (EKS, GKE, AKS) in cloud environments, installing it with kubeadm on bare-metal or on-premises servers provides full control over the cluster configuration. kubeadm is the official […]
HTTP security headers are a lightweight but highly effective layer of defence for web applications, instructing browsers to enforce policies that mitigate common attacks like clickjacking, MIME-type sniffing, cross-site scripting (XSS), and protocol downgrade attacks. HSTS (HTTP Strict Transport Security) forces browsers to use HTTPS exclusively, while a Content Security Policy (CSP) controls which resources […]
Standard Linux memory pages are 4 KB, and the kernel must maintain a Translation Lookaside Buffer (TLB) entry for each mapped page. Database systems that manage large shared memory segments — such as PostgreSQL’s shared_buffers, Oracle’s SGA, or MySQL’s InnoDB buffer pool — can create millions of TLB entries, causing frequent TLB misses that significantly […]
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 […]
How to Install Xdebug for PHP on RHEL 7 Xdebug is the de facto debugging and profiling extension for PHP. It transforms PHP development from a cycle of var_dump() statements into a proper interactive debugging experience: you can set breakpoints, step through code line by line, inspect variable values at runtime, and generate detailed execution […]
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 […]
Grafana’s dashboard builder lets you turn raw Prometheus metrics into intuitive visualizations — stat panels for at-a-glance health, time series for trends, and bar gauges for comparisons. With Prometheus and Node Exporter already collecting Linux host metrics, you have everything needed to build a production-grade server dashboard. This tutorial walks through creating panels for CPU, […]
DNSSEC (DNS Security Extensions) adds cryptographic signatures to DNS records, protecting against cache poisoning and DNS spoofing attacks where an attacker forges DNS responses to redirect users to malicious sites. On RHEL 9, BIND9 is the standard DNS server and includes full DNSSEC support out of the box. This tutorial walks through enabling DNSSEC validation, […]
The Prometheus Blackbox Exporter allows you to probe external endpoints over HTTP, HTTPS, TCP, and ICMP and expose the results as Prometheus metrics. Unlike Node Exporter, which reports what is happening inside a host, the Blackbox Exporter reports whether a service is reachable from the outside — making it ideal for end-to-end availability checks. This […]
Composer is the de facto dependency manager for PHP, used by virtually every modern PHP framework and library including Laravel, Symfony, and Guzzle. It resolves and installs packages from Packagist, handles autoloading, and tracks version constraints so your project dependencies stay consistent across environments. This tutorial covers installing Composer on RHEL 8 using the official […]
