DevOps – Page 3 – ITFROMZERO

Using tcpdump and Wireshark to Effectively Analyze Network Traffic

By admin March 6, 2026

A hands-on guide to combining tcpdump and Wireshark for capturing and analyzing network traffic on Linux servers. Covers everything from basic filter commands to advanced intermittent packet loss debugging, with production-ready optimization tips.

VMware

Installing VMware Workstation and Creating Your First VM: A Hands-On Guide

By admin March 6, 2026

A hands-on guide to installing VMware Workstation Pro (free since 2024) and creating your first Ubuntu Server VM — version comparisons, optimal configuration, snapshots, and tips from real-world experience.

MySQL

MySQL Database Backup and Restore: Practical Lessons from Production

By admin March 6, 2026

A practical guide to MySQL database backup and restore based on real experience with a 50GB production database. Compares mysqldump, mysqlpump, and XtraBackup, with automation scripts and the 3-2-1 backup strategy.

Network

Measuring Network Speed and Performance with iperf3 on Linux Server

By admin March 6, 2026

A guide to using iperf3 to measure real-world bandwidth between two Linux servers, detect packet loss and jitter with UDP mode, and write time-based monitoring scripts to catch intermittent issues. Includes comparisons with speedtest-cli and netperf to help you pick the right tool for each scenario.

Network

How to Use nmap for Network Scanning and Linux Server Security Auditing

By admin March 6, 2026

A practical guide to using nmap for port scanning, service detection, and Linux server security auditing — drawn from real infrastructure management experience. Covers basic commands, NSE scripts, and an automation script for weekly audits.

Docker

Docker Compose: Managing Multi-Container Applications from Real-World Experience

By admin March 5, 2026

Docker Compose lets you define and run an entire multi-container stack with a single YAML file and a single command. This article shares real-world patterns: proper healthchecks, environment separation with .env files, resource limits, and the commands that actually come up in daily work.

Docker

Docker for Beginners: Understanding Containers, Images, and Volumes from Scratch

By admin March 5, 2026

Docker solves the classic 'it works on my machine' problem by packaging your entire application into isolated containers — far lighter than VMs. This guide walks you through installing Docker on Ubuntu, explains the core concepts of Images, Containers, Volumes, and Networks, and shows you how to monitor containers in a real-world environment.

Docker

Docker Container Security: Best Practices for Developers

By admin March 5, 2026

A practical guide to Docker container security: from non-root users and read-only filesystems to network isolation, secret management, and vulnerability scanning. A complete checklist to review before deploying to production.

Monitoring

Installing Prometheus and Grafana for Real-Time Server Monitoring

By admin March 4, 2026

A practical guide to installing Prometheus, Node Exporter, and Grafana on Ubuntu 22.04 for real-time server monitoring. Covers scrape target configuration, importing a pre-built dashboard (ID 1860), and setting up CPU/RAM threshold alerts.

Database

PostgreSQL Backup Done Right: Strategy, Automation, and Real-World Restore Testing

By admin March 4, 2026

PostgreSQL backup isn't just about running pg_dump and walking away — the more critical part is regular restore testing and monitoring backup file integrity. This post shares a battle-tested workflow with automation scripts, a comparison of pg_dump vs pg_basebackup, and a complete checklist to make sure your backups actually work when it counts.