If you manage Linux servers long enough, you eventually hit this moment: Server is slow… users are shouting… and logs are everywhere. /var/log/messages /var/log/secure /var/log/nginx/access.log /var/log/nginx/error.log /var/log/mysql/error.log /var/log/audit/audit.log /app/logs/*.log /docker/containers/*/*.log So what do you do? You SSH into the box and start the ancient ritual: [root@siddhesh ~]# tail -f /var/log/messages [root@siddhesh ~]# tail -f /var/log/nginx/error.log

Introduction In modern cloud environments, auto scaling  is critical for high availability, performance, and cost optimization. Instead of running multiple servers all the time, AWS allows you to automatically scale EC2 instances based on load . In this blog, we will configure: Apache Web Server on EC2 Auto Scaling Group (ASG) Launch Template Target Tracking Policy Scale out when CPU > 5% Automatically launch a second Apache instance This setup is ideal for: Web applications

Monitoring EC2 instances is a basic but critical task for every DevOps engineer. AWS provides CloudWatch for collecting metrics, and Grafana makes visualisation simple and powerful. In this blog, we will learn how to monitor an AWS EC2 instance using CloudWatch and Grafana , step by step, in a clean and practical way. 🧩 Architecture Overview ✅ Prerequisites Before starting, make sure you have: An AWS account A running EC2 instance IAM user with programmatic access Grafana in

📌 Overview Prometheus Node Exporter provides excellent system-level metrics, but in real-world production environments, we often need custom application metrics  — for example: Postfix mail queue size Service status running/failure Application health Queue depth In this blog, we will implement a custom Node Exporter metric  to monitor postfix mail queue and visualise it in Grafana , using the textfile collector,  the recommended and production-safe approach. 🧠 Architecture

System integrity is one of the most overlooked areas in Linux security. Firewalls, SELinux, and antivirus tools are common, but they do not tell you if critical system files were modified silently . This is where AIDE (Advanced Intrusion Detection Environment)  fits perfectly. In this blog, I’ll walk through what AIDE is, how it works, how to configure it properly , and how to interpret its output  on RHEL, Rocky Linux, and CentOS . All commands shown below were executed manu

Push notifications are no longer limited to mobile apps or big SaaS platforms. With ntfy , you can send instant push notifications to your mobile or desktop using simple HTTP requests. This makes it extremely useful for DevOps alerts, cron jobs, CI/CD pipelines, monitoring systems, and server-side scripts . In this blog, we’ll set up ntfy  on a Rocky Linux / RHEL  server and securely expose it using Nginx  as a reverse proxy. What is ntfy? ntfy  is a lightweight, open-source

Introduction: Cockpit is a powerful web-based interface that simplifies server management tasks on Linux systems. By default, Cockpit...

Enabling the NGINX status page involves configuring NGINX to expose a special endpoint that provides information about the server's...

Linux offers a vast array of command-line utilities, each designed to perform specific tasks efficiently. One such versatile tool is the...