Security – Page 2 – ITFROMZERO

How to Configure sudo and the sudoers File on Linux: Safe Permission Management for Each User

By admin March 15, 2026

A comparison of 3 approaches to granting sudo access on Linux: adding users to the wheel/sudo group, editing /etc/sudoers directly, or using /etc/sudoers.d/. Covers the pros and cons of each approach along with practical configuration guides using visudo, Command Aliases, and NOPASSWD for team-based production environments.

Security

Nginx TLS 1.3 Configuration Guide and Cipher Suite Optimization: Achieve A+ on SSL Labs

By admin March 14, 2026

A comprehensive guide to configuring Nginx to enable TLS 1.3 and optimize cipher suites, helping your web server achieve an A+ rating on SSL Labs. Explore practical steps and foundational knowledge of TLS security.

Database

Guide to Installing and Optimizing MongoDB for Production Environments

By admin March 14, 2026

Deploying MongoDB in a production environment is more than just basic installation. This article analyzes common issues, core causes, and provides detailed guidance on installation, Replica Set configuration, indexing optimization, security enhancement, and scaling with Sharding, helping your application run stably and efficiently.

MySQL

MySQL Server Security: Essential Steps to Protect Production Data

By admin March 13, 2026

MySQL server security is vital for protecting production data. This article compares security methods, from basic configuration to SSL/TLS implementation and firewalls. It provides detailed steps to ensure the safety of your database.

Security

Hashing and Data Encoding: MD5, SHA-256, Base64, and Their Applications in IT Security

By admin March 11, 2026

In the IT world, data security is crucial. This article shares practical experiences with common vulnerabilities and how concepts like Hashing, MD5, SHA-256, and Base64 help protect critical information. A detailed guide from theory to practice.

Security

Linux Security Audit Logs: Experiences from an IT Engineer

By admin March 11, 2026

As an IT engineer, I know the importance of auditing Linux security logs. My server once suffered an SSH brute-force attack in the middle of the night—since then, I prioritize log auditing to detect threats early and protect the system.

Security

A Guide to Configuring AppArmor on Ubuntu: Restricting Process Permissions to Secure Your Server

By admin March 9, 2026

Many admins focus only on firewalls and SSH, forgetting the danger posed by the running applications themselves. This article shares real-world experience on how to use AppArmor on Ubuntu to 'jail' processes, limit their permissions, and prevent privilege escalation during an attack.

Security

Enhancing SSH Security: A Guide to Setting Up 2FA with Google Authenticator

By admin March 9, 2026

Don't let your server be compromised by a password alone. This guide will show you how to set up a second layer of 'armor' for SSH using your phone with Google Authenticator.