srisanthosh S

1. Introduction Hostname resolution in Linux is the process of translating a domain name (e.g., example.com) into its corresponding IP address. This process is controlled by: This document explains how hostname resolution works on the current server configuration. 2. Current Configuration 2.1 /etc/nsswitch.conf This line defines the order in which… Continue Reading Name Resolution Flow in Linux

Introduction A Kubernetes Secret is used to store sensitive data (like passwords, tokens, or keys) securely. Creating a Secret from a file is useful when you already have the secret value saved in a file (example: db_password.txt) and you want Kubernetes to manage it and provide it to Pods when… Continue Reading How to create a Kubernetes Secret from a file

1. Introduction When setting up a reverse proxy (for example, using Nginx) in front of a backend service like Argo CD or any HTTPS-only application, you might encounter the error: This happens when the proxy forwards HTTP traffic to a backend that enforces HTTPS.As a result, the backend keeps redirecting… Continue Reading Fixing HTTP 307 Redirect Issue in Reverse Proxy Setup

Introduction HashiCorp Vault uses policies to define what operations and paths users, applications, or systems can access. Policies ensure fine-grained access control, making it possible to separate responsibilities and secure secrets effectively.This document explains how to list all existing policies in Vault and how to export a specific policy for… Continue Reading To list and export the existing Vault Policies

1. Introduction iptables is a powerful firewall utility available in Linux systems that allows administrators to control incoming and outgoing network traffic. One common use case is blocking traffic from a specific IP address to protect a server from malicious activity, repeated failed login attempts, or excessive requests. This document… Continue Reading Blocking an IP Address using iptables

Introduction In Linux, every file contains metadata that includes several timestamps: The touch command is commonly used to update the access and modification times. However, note that Linux does not allow modification of the birth (creation) time using standard tools. Prerequisites To follow this guide, ensure: Timestamp Format: [[CC]YY]MMDDhhmm[.ss]Example: 202404200101.00… Continue Reading Modifying File Timestamps in Linux Using touch

Introduction Managing multiple PHP versions is essential for developers who work on different projects requiring different PHP versions. Ubuntu provides a way to install and switch between multiple PHP versions using the APT package manager and the update-alternatives command. This guide will help you list, install, and switch between PHP… Continue Reading Managing Multiple PHP Versions on Ubuntu Using APT

Introduction to Symbolic Links in Linux: In Linux, a symbolic link (often called a symlink or soft link) is a special type of file that points to another file or directory. It acts as a shortcut or reference to the target file, allowing you to access the target from a… Continue Reading How to Create and remove a Symbolic Link in Linux ?