Introduction Deploying configure apache2 virtual hosts on debian 9 on a Debian 9 Stretch machine is straightforward thanks to Debian’s policy-compliant packaging. Unlike rpm-based distributions, Debian stores configuration helpers in /etc/default/, uses update-rc.d for older init scripts, and provides dpkg-reconfigure for interactive package configuration. This tutorial stays on the systemd path throughout. Prerequisites Ensure Debian […]
How to Set Up Two-Factor Authentication for SSH with Google Authenticator on RHEL 7 Password-based SSH authentication is vulnerable to brute-force attacks, credential stuffing, and phishing. Adding a second authentication factor — a time-based one-time password (TOTP) generated by an app like Google Authenticator or Authy — dramatically reduces this risk. Even if an attacker […]
🟡 Medium ⏱ 5–30 min Last verified: 20 December 2019 📖 ~1 min read Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution – Primary Fix Solution – Alternative Approaches Verification & Acceptance Criteria Rollback Plan Prevention & Hardening Related Errors & Cross-Refs References & Further […]
The Linux Audit system (auditd) provides a comprehensive security logging framework that records system calls, file accesses, and user actions at the kernel level. On RHEL 8, auditd is installed and enabled by default, making it a foundational component of any security compliance strategy. Whether meeting requirements for PCI-DSS, HIPAA, or internal policy, audit rules […]
pgAdmin 4 is the official open-source administration and development platform for PostgreSQL, providing a rich web interface for managing databases, running queries, monitoring activity, and visualizing schemas. On RHEL 8, the recommended installation path is the official PostgreSQL Global Development Group (PGDG) repository, which ships pgAdmin 4 as a dedicated web application package with a […]
Introduction This guide explains how to Configure Postfix Mail Server on Debian 9 on Debian 9 Stretch. Debian Stretch uses systemd for service management, nftables as the underlying packet filter (with ufw or iptables front-ends still available), and AppArmor for mandatory access control. Every command is designed for a minimal Debian 9 install with the […]
How to Set Up Windows Server 2019 Network File System Network File System (NFS) on Windows Server 2019 enables interoperability between Windows and Unix/Linux systems by providing NFS server and client roles. The Server for NFS role allows Windows Server 2019 to export shared directories that Linux, macOS, and other Unix-based systems can mount natively. […]
Introduction How to Set Up pgBouncer Connection Pooler on Debian 9 is a fundamental operation for any administrator maintaining a Debian 9 Stretch server. Debian 9 Stretch ships with the Linux 6.12 kernel, updated toolchains, and a fully refreshed package archive — meaning version numbers, configuration file paths, and some dependency chains differ from Debian […]
🟠 High ⏱ 5–30 min Last verified: 17 December 2019 Affected versions: Windows Server 2016 📖 ~1 min read Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution — Primary Fix Solution — Alternative Approaches Verification & Acceptance Criteria Rollback Plan Prevention & Hardening Related Errors […]
🔴 Critical ⏱ 5–30 min Last verified: 16 December 2019 Affected versions: Ubuntu 18.04 LTS 📖 ~1 min read Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution – Primary Fix Solution – Alternative Approaches Verification & Acceptance Criteria Rollback Plan Prevention & Hardening Related Errors […]
