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Monitoring tutorial - IT technology blog

Prometheus Blackbox Exporter: Monitor HTTP, DNS, TCP and SSL Certificate Expiry

By admin April 21, 2026

Prometheus Blackbox Exporter monitors websites, TCP ports, DNS resolution, and SSL certificates from the end-user's perspective — no agent installation required on each server. This guide covers installation, configuring HTTP/DNS/TCP modules, and setting up SSL expiry alerts integrated with Alertmanager.

Security

Turning Linux into a Database: Querying and Security Monitoring with osquery

By admin April 21, 2026

Stop struggling with Bash scripts. Learn how to use osquery to query the Linux operating system using SQL, making security monitoring and infrastructure management 10x more efficient.

MySQL

MySQL 8 CTE: A Professional Solution for Hierarchical Data and Recursive Queries

By admin April 21, 2026

A detailed guide on using CTE and Recursive CTE in MySQL 8 to efficiently handle hierarchical data, replace complex Self-joins, and optimize query performance.

Git

Mastering LF/CRLF Issues and Binary File Management with .gitattributes

By admin April 21, 2026

Don't let LF/CRLF line ending errors ruin your commit logs. Here's a guide to configuring .gitattributes to sync Windows and macOS environments while protecting binary files.

Ubuntu

Forgot Your Ubuntu Password? How to Reset via GRUB & Recovery Mode in 5 Minutes

By admin April 21, 2026

Forgetting your Ubuntu password is no longer a disaster. Here is a detailed guide on 2 ways to reset your password via GRUB and Recovery Mode, helping you regain control of your server in under 5 minutes.

VMware

Goodbye Patching Stress: Mastering vSphere Lifecycle Manager (vLCM) in Practice

By admin April 21, 2026

Forget risky manual ESXi updates. Discover how to use vSphere Lifecycle Manager (vLCM) to automate patching and ensure consistent driver and firmware management across VMware Clusters.

Database

Is Your PostgreSQL Disk Bloating? Pro Tips to Fix Bloat and Optimize Autovacuum

By admin April 21, 2026

PostgreSQL disk full due to Database Bloat? Learn how to optimize Autovacuum, use pg_repack, and REINDEX CONCURRENTLY to free up space without downtime.

Centos

OpenSCAP: The Automation ‘Weapon’ for PCI-DSS Security Audits on CentOS for DevOps

By admin April 21, 2026

Don't let security audits become a nightmare. Discover how to use OpenSCAP to automate vulnerability scanning and PCI-DSS compliance on CentOS/RHEL based on real-world DevOps experience.

Automating Proxmox with Terraform: From Manual ‘Click-ops’ to Professional IaC

Building a Data Streaming System with Apache Kafka and Node.js: From Zero to Production

Mastering Logical Replication in PostgreSQL: Flexible and Practical Data Sync

Mastering Fedora Security: Managing System-Wide Encryption with update-crypto-policies

Automating Dependencies with Renovate: Don’t Let Manual Updates Slow You Down

Harbor Installation Guide: Building a Professional Private Registry for DevOps

How to Never Forget SSL and Domain Renewals Again with Prometheus Blackbox Exporter

Boost Productivity with Git Aliases: Don’t Let Typing Commands Slow You Down

How to Safely Expose Docker Containers to the Internet via Cloudflare Tunnel (No Port Forwarding)

Self-hosting Grafana OnCall: Professional On-call Scheduling and Escalation for DevOps Teams

Prometheus Blackbox Exporter: Monitor HTTP, DNS, TCP and SSL Certificate Expiry

Turning Linux into a Database: Querying and Security Monitoring with osquery

MySQL 8 CTE: A Professional Solution for Hierarchical Data and Recursive Queries

Mastering LF/CRLF Issues and Binary File Management with .gitattributes

Forgot Your Ubuntu Password? How to Reset via GRUB & Recovery Mode in 5 Minutes

Goodbye Patching Stress: Mastering vSphere Lifecycle Manager (vLCM) in Practice

Is Your PostgreSQL Disk Bloating? Pro Tips to Fix Bloat and Optimize Autovacuum

OpenSCAP: The Automation ‘Weapon’ for PCI-DSS Security Audits on CentOS for DevOps