Text-based HTTP responses — HTML, CSS, JavaScript, JSON, XML, SVG — compress dramatically with standard compression algorithms, often achieving 60–80% size reduction. Nginx supports two compression algorithms: gzip (built-in, universal browser support) and Brotli (via the ngx_brotli dynamic module, 15–20% better compression than gzip for text, supported by all modern browsers). Enabling compression is one […]
Rate limiting is a server-side defence that restricts how many requests a client can make within a time window. Without rate limiting, a single IP address or bot can flood your server with thousands of requests per second — crashing your application, exhausting your database connection pool, or triggering denial-of-service conditions. Nginx provides two rate […]
Load balancing distributes incoming requests across multiple backend servers, preventing any single server from becoming a bottleneck and providing horizontal scalability and fault tolerance. Nginx supports four load balancing methods natively: round-robin (the default), least connections, IP hash (session persistence), and weight-based. The upstream block defines the pool of backend servers and their weights, and […]
Nginx (pronounced “engine-x”) is the most widely deployed web server in the world, powering everything from small personal websites to the largest content delivery networks. On RHEL 9, Nginx is available from the AppStream repository and integrates natively with SELinux, firewalld, and systemd. Its event-driven, non-blocking architecture means a single Nginx worker process can handle […]
Every Linux administrator needs at least one terminal text editor in their toolkit. When a remote server is accessible only via SSH with no GUI, when a configuration file needs editing before a service can start, or when you are recovering a broken system from a rescue shell, your text editor is your primary interface. […]
The Linux kernel’s systemd journal is a structured binary log that stores the output of every service, kernel message, boot sequence, and user session. Unlike traditional text-based syslog, the journal stores metadata alongside each log entry — the unit name, PID, UID, executable path, systemd unit state, and priority level — enabling far more precise […]
Running out of disk space is one of the most disruptive failures a server can experience. When a filesystem fills up, applications crash, log files stop writing (losing audit trails), databases corrupt transactions, and web servers return 500 errors. Proactive disk monitoring is essential — and RHEL 9 provides a full set of tools for […]
Automated task scheduling is the backbone of server maintenance: backups run at 3 AM, log cleanup happens daily, SSL certificates renew before they expire, and databases are vacuumed weekly. On RHEL 9, there are three scheduling mechanisms each suited to different scenarios. cron is the classic daemon that runs jobs on a schedule defined by […]
While the earlier tutorial in this series covered the core useradd, usermod, and userdel tools for user lifecycle management, this guide goes deeper into the full toolkit for managing users and groups at scale on RHEL 9: bulk creation, password management with chpasswd, group administration with gpasswd, per-user resource limits with ulimit and /etc/security/limits.conf, user […]
Systemd is the init system and service manager for RHEL 9 — it is PID 1, the parent of every other process on the system. Understanding how to manage systemd services is foundational to every other administrative task: installing Nginx means enabling the nginx service; configuring a database means understanding its unit file; debugging a […]
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