Vinay Vengala

Tuning RHEL 9 Network Interface Card (NIC) Rings and Transmit Queues (txqueuelen) for Ultra-Low Latency APIs

Understanding NIC Ring Buffers and Transmit Queues For enterprise applications demanding ultra-low latency, particularly those serving high-frequency trading platforms, real-time analytics, or critical API endpoints, the performance of the network interface card (NIC) is paramount. Two key, often overlooked, tuning parameters directly impacting network throughput and latency are the NIC’s receive (RX) and transmit (TX) […]

Installing and Configuring Memcached with SASL Authentication on RHEL 9 for Distributed Laravel Session Storage

Prerequisites and Initial Setup This guide assumes you have a RHEL 9 server (or multiple servers for a distributed setup) with root or sudo privileges. We’ll be installing Memcached and configuring SASL for secure authentication. This is crucial for protecting your session data when using Memcached as a distributed session store for Laravel applications. First, […]

Setting up Isolated Developer Workspaces on RHEL 9 using Podman Containers and Nginx Stream Router Routing

Prerequisites and Initial Setup This guide assumes a RHEL 9 system with root or sudo privileges. We’ll be leveraging Podman for containerization and Nginx as a stream router to direct traffic to isolated developer environments. Ensure Podman is installed and running. If not, execute: sudo dnf install -y podman sudo systemctl enable –now podman.socket Similarly, […]

Troubleshooting Systemd Journald Log Spikes and Disk Space Exhaustion on RHEL 9 under Intense Network Scrapes

Diagnosing Journald Log Volume Surges on RHEL 9 Enterprise environments running RHEL 9 often encounter unexpected spikes in systemd-journald log volume, particularly when subjected to intense network scraping or high-throughput application activity. This can rapidly lead to disk space exhaustion, impacting system stability and availability. This post details a systematic approach to diagnosing and mitigating […]

Tuning OpenSSL 3.0 and Nginx TLS 1.3 Handshake Performance on RHEL 9 for Secure PCI-Compliant E-commerce Servers

Verifying OpenSSL and Nginx Versions on RHEL 9 Before embarking on performance tuning, it’s crucial to confirm that your RHEL 9 system is running the expected versions of OpenSSL and Nginx. PCI DSS compliance often mandates specific cryptographic library versions and secure TLS configurations. OpenSSL 3.0.x and a recent Nginx version are prerequisites for leveraging […]

Upgrading RHEL 8 to RHEL 9: Migrating High-Throughput Perl Dancer2 Legacy Apps without Core API Breaking Changes

Pre-Upgrade Assessment and Preparation Migrating a production RHEL 8 environment, especially one hosting high-throughput Perl Dancer2 applications, to RHEL 9 requires meticulous planning. The primary concern for legacy Dancer2 applications is the potential for breaking changes in core Perl modules or system libraries that these applications depend on. RHEL 9, while offering significant advancements, also […]

Installing and Configuring an Enterprise WordPress Environment on RHEL 9: Complete High-Availability Architecture

Prerequisites and Initial Setup This guide assumes a RHEL 9 minimal installation with root or sudo privileges. We will deploy a highly available WordPress environment leveraging Nginx as the web server, MariaDB for the database, and Redis for object caching. For high availability, we’ll configure two web servers behind a load balancer (HAProxy in this […]

Installing and Compiling Native GCC 13 C Shared Libraries (.so) on CentOS Stream 9 for Custom PHP FFI Integrations

Prerequisites and Environment Setup This guide assumes a CentOS Stream 9 minimal installation. We’ll need development tools, specifically the GCC compiler and its associated libraries, to build GCC 13 from source. The PHP FFI (Foreign Function Interface) extension requires compiled shared libraries (.so files) to interact with C code. This process involves not just compiling […]

Troubleshooting MySQL 8.0 Memory Allocation Spikes on Rocky Linux 9: Tuning InnoDB Buffer Pool Instances

Identifying Memory Spikes with `mysqltuner` and `atop` When diagnosing unexpected memory consumption in MySQL 8.0 on Rocky Linux 9, a common culprit is the InnoDB buffer pool. Before diving into configuration, it’s crucial to establish a baseline and pinpoint the exact moments of high memory usage. Tools like mysqltuner and atop are invaluable for this. […]

Upgrading Apache 2.4 with HTTP/2 support on Rocky Linux 9: Resolving protocol negotiation timeouts

Prerequisites and Initial Setup This guide assumes a fresh Rocky Linux 9 installation with root or sudo privileges. We’ll be upgrading Apache from its default version (likely 2.4.53 or similar) to a version that robustly supports HTTP/2, and crucially, addressing potential protocol negotiation timeouts that can plague initial deployments. Ensure your system is up-to-date: Run […]

Vinay Vengala

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