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How to Configure Two-Factor Authentication (2FA) for SSH on CentOS Stream 9 with Google Authenticator and PAM

By IT From Zero October 2, 2026

A step-by-step guide to setting up two-factor authentication (2FA) for SSH on CentOS Stream 9 using Google Authenticator and PAM. Combining SSH keys with TOTP OTP keeps your server secure even if private keys are compromised.

Python

A Guide to Using Alembic in Python: Database Migration Management for SQLAlchemy

By IT From Zero October 2, 2026

Managing database schema changes is critical as Python projects scale. Here is a comprehensive guide to setting up Alembic with SQLAlchemy to automate migrations, sync via Git, and perform safe rollbacks.

Artificial Intelligence tutorial - IT technology blog

Using ChromaDB with Python: Build a Lightweight Local Vector Database for AI Applications

By IT From Zero October 2, 2026

Suffering from OOM killer memory crashes due to in-memory NumPy vectors? Here is how to integrate ChromaDB PersistentClient in Python for a lightweight, robust local vector database.

Git

A Complete Guide to Safely Reverting a Merge Commit with git revert -m and Re-merging Accurately

By IT From Zero October 2, 2026

A detailed guide on using git revert -m to roll back production merge commit incidents, plus a 3-step workflow to safely re-merge branches after bug fixes without losing code.

Network

Configuring a DNS Firewall with Response Policy Zones (RPZ) on BIND9: Block Malware and Phishing Effectively

By IT From Zero October 2, 2026

A detailed guide on deploying a DNS Firewall with Response Policy Zones (RPZ) in BIND9. Block malware and phishing directly at your internal DNS resolver with minimal overhead.

Security

A Guide to Network Packet Capture and Analysis with Tshark on Linux: Investigating Anomalous Traffic and Detecting Attacks from the CLI

By IT From Zero October 1, 2026

A practical guide to capturing and analyzing network packets from the Linux command line using Tshark to investigate port scans, detect DNS anomalies, and stop SSH brute-force attacks.

Fedora

Bcachefs on Fedora: Experience a File System “Fast as XFS, Feature-rich as ZFS”

By IT From Zero September 29, 2026

Bcachefs has officially arrived on Fedora. Discover how to configure this next-gen file system with top-tier features: Copy-on-Write, native encryption, and SSD+HDD tiering.

Python

Python Type Hints: Don’t Let ‘NoneType’ Errors Ruin Your Sleep

By IT From Zero September 29, 2026

Type Hints don't just make code look better; they act as a shield against runtime errors. Learn how to use Union, Optional, Callable, and Generic for Enterprise-grade code.

Python

Goodbye print(): Professional Python Monitoring and Debugging with Pydantic Logfire

By IT From Zero September 29, 2026

Stop letting debugging become a nightmare. Discover how Pydantic Logfire helps you see into every corner of your Python application with structured data and an intuitive dashboard.

Python

Mastering confluent-kafka in Python: Secrets to Processing Millions of Events per Second

By IT From Zero September 27, 2026

Don't let your database crash from overload! A detailed guide on using confluent-kafka in Python to handle millions of events per second with production-ready configurations.

Installing and Configuring Auditd on Ubuntu Server: Tracing User Actions Down to the Kernel Level

How to Use git-credential-oauth: Log in to GitHub and GitLab in Terminal via Browser

How to Enable Virtualization-Based Security (VBS) and Credential Guard on VMware vSphere

Building Your Own MCP Server with TypeScript: Connect AI Assistants to Internal Systems

Mastering TanStack Query v5 in React: Practical Server State Management, Caching, and Optimistic Updates

Installing ModSecurity v3 and OWASP CRS on Nginx Ubuntu: Building a Production-Ready Web Server WAF

Centralized Cloudflare Traffic and Security Monitoring with Cloudflare Exporter, Prometheus, and Grafana

Guide to E2B Code Interpreter with Python: Building a Secure Sandbox for AI Agents

A Guide to bpftrace and BCC on Fedora: Linux Performance Analysis and Diagnostics with eBPF

Optimizing Index Merge in MySQL: Understanding Intersection, Union, and Handling Optimizer Missteps

How to Configure Two-Factor Authentication (2FA) for SSH on CentOS Stream 9 with Google Authenticator and PAM

A Guide to Using Alembic in Python: Database Migration Management for SQLAlchemy

Using ChromaDB with Python: Build a Lightweight Local Vector Database for AI Applications

A Complete Guide to Safely Reverting a Merge Commit with git revert -m and Re-merging Accurately

Configuring a DNS Firewall with Response Policy Zones (RPZ) on BIND9: Block Malware and Phishing Effectively

A Guide to Network Packet Capture and Analysis with Tshark on Linux: Investigating Anomalous Traffic and Detecting Attacks from the CLI

Bcachefs on Fedora: Experience a File System “Fast as XFS, Feature-rich as ZFS”

Python Type Hints: Don’t Let ‘NoneType’ Errors Ruin Your Sleep

Goodbye print(): Professional Python Monitoring and Debugging with Pydantic Logfire

Mastering confluent-kafka in Python: Secrets to Processing Millions of Events per Second