Vengala Vinay

Upgrading a high-traffic production PostgreSQL database cluster from version 15 to 16 using pg_upgrade link mode on Debian 12

Pre-Upgrade Assessment and Preparation Before embarking on a major PostgreSQL version upgrade, a thorough assessment of the existing cluster is paramount. This involves understanding the current resource utilization, identifying any deprecated features or extensions that might not be compatible with PostgreSQL 16, and establishing a robust rollback strategy. For a high-traffic production environment, minimizing downtime […]

Upgrading PHP 8.2 to 8.3 on Rocky Linux 9: Re-compiling APCu, Imagick, and Memcached extensions safely

Prerequisites and Initial Assessment Before embarking on the PHP upgrade from 8.2 to 8.3 on Rocky Linux 9, a thorough assessment of your current environment is paramount. This includes identifying all installed PHP extensions, their compilation methods (e.g., PECL, distribution packages), and any custom configurations. Understanding dependencies is crucial to avoid service disruptions. We’ll assume […]

Installing and Configuring Apache with HTTP2 support and static PHP-FPM sockets on openSUSE Leap 15.5

Prerequisites and System Update Before proceeding, ensure your openSUSE Leap 15.5 system is up-to-date. This guarantees you have the latest security patches and package versions, which is crucial for a production environment. We will also verify the presence of necessary packages. Execute the following commands to update your system and install Apache, PHP-FPM, and necessary […]

Installing and Setting up a Local Composer Mirror Server on RHEL 9 to accelerate internal developer deployment loops

Prerequisites and Initial Setup This guide details the installation and configuration of a local Composer mirror server on Red Hat Enterprise Linux 9 (RHEL 9). The primary objective is to significantly accelerate internal developer deployment loops by reducing external network latency and dependency on public repositories. This setup is crucial for enterprises with strict security […]

Installing and Configuring standard Prometheus Node Exporter metrics endpoints on Rocky Linux 9: Infrastructure audits

Prerequisites and System Preparation Before proceeding with the installation of Prometheus Node Exporter on Rocky Linux 9, ensure your system is up-to-date and has the necessary tools installed. This section outlines the essential preparation steps for a robust infrastructure audit setup. Verify that your Rocky Linux 9 system has internet connectivity and that the `dnf` […]

Installing and Setting up a Secure multi-port PgBouncer connection pooler on Debian 12 Bookworm for PostgreSQL 16

Prerequisites and Initial Setup This guide assumes you have a Debian 12 (Bookworm) server with PostgreSQL 16 already installed and running. We’ll be installing PgBouncer from the official Debian repositories for simplicity and stability. Ensure your PostgreSQL server is accessible from the PgBouncer host. For this setup, we’ll configure PgBouncer to listen on multiple ports, […]

Installing and Configuring Nginx with HTTP/3 (QUIC) support from source on Ubuntu 24.04 LTS: Performance Guides

Prerequisites and Dependencies Before compiling Nginx with HTTP/3 support, ensure your Ubuntu 24.04 LTS system is up-to-date and has the necessary development tools and libraries installed. This includes the GCC compiler, OpenSSL development headers, and the BoringSSL library, which is a fork of OpenSSL and a dependency for HTTP/3. We will also need the `libp7-dev` […]

Troubleshooting Btrfs filesystem errors, corrupt metadata, and sector recovery pipelines on openSUSE Leap 15.5

Initial Assessment: Identifying Btrfs Corruption Symptoms When a Btrfs filesystem begins exhibiting signs of corruption, it’s rarely a sudden, catastrophic event. More often, it manifests as subtle performance degradations, unexpected application crashes, or specific error messages logged by the kernel. For enterprise infrastructure, early detection is paramount. Common indicators include: Kernel log entries containing “BTRFS […]

Troubleshooting high CPU load spikes caused by MariaDB index fragmentation on RHEL 9: Table rebuild runbooks

Identifying MariaDB CPU Spikes and Index Fragmentation High CPU load spikes on RHEL 9 systems, particularly those hosting MariaDB, can often be traced to inefficient query execution exacerbated by index fragmentation. This fragmentation leads to increased I/O operations and CPU cycles spent scanning larger, less efficient index blocks. The first step is to confirm this […]

Troubleshooting Nginx ‘502 Bad Gateway’ and ‘504 Gateway Timeout’ errors: Diagnosing upstream sock allocations on Rocky Linux 9

Understanding Nginx 502 and 504 Errors The ‘502 Bad Gateway’ and ‘504 Gateway Timeout’ errors in Nginx are symptomatic of upstream communication failures. A 502 indicates that Nginx, acting as a reverse proxy, received an invalid response from an upstream server (e.g., a PHP-FPM process, a Node.js application, or another web service). A 504, conversely, […]