Nagios Core is a widely-used open-source infrastructure monitoring system that alerts administrators to host and service failures. On RHEL 9, Nagios Core must be compiled from source since no official RPM package is maintained for the current release. This guide walks you through building Nagios Core 4.x, installing the standard plugins, securing the web interface […]
Introduction This tutorial demonstrates how to Set Up MySQL with SSL on Oracle Linux 9 on Oracle Linux 9. It is written for administrators who want a repeatable, well-explained walkthrough that goes beyond a bare command list and explains each configuration choice. Every command is tested against a freshly registered Oracle Linux 9 system with […]
🔴 Critical ⏱ 5–30 min Last verified: 7 July 2023 Affected versions: Debian 12 📖 ~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 & […]
How to Add and Remove Windows Server Roles and Features with PowerShell on Windows Server 2022 Windows Server 2022 uses a modular architecture where capabilities are added or removed as Roles and Features. Roles are major server functions like Active Directory Domain Services, IIS, or DHCP Server. Features are supporting components like .NET Framework, Failover […]
Why Accurate Time Matters on Windows Server 2022 Time synchronisation is not a cosmetic concern on Windows Server — it is a hard operational requirement. Kerberos authentication, the default protocol in Active Directory environments, refuses to authenticate tickets when the time difference between a client and a domain controller exceeds five minutes (the default MaxClockSkew). […]
🟠 High ⏱ 5–30 min Last verified: 5 July 2023 Affected versions: Debian 12 📖 ~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 & […]
Introduction This guide explains how to Install Zabbix Server on Debian 12 on Debian 12 Bookworm. Debian Bookworm 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 12 install with the standard […]
How to Set Up a Windows Server Load Balancer with NLB on Windows Server 2022 Network Load Balancing (NLB) is a built-in Windows Server feature that distributes incoming TCP/UDP traffic across multiple servers in a cluster. It is designed for stateless workloads such as web servers, FTP servers, VPN endpoints, and other internet-facing applications. Unlike […]
What Is a Read-Only Domain Controller and When to Use It A Read-Only Domain Controller (RODC) is a special type of Active Directory domain controller introduced in Windows Server 2008 that holds a read-only, non-writable copy of the AD database. RODCs were designed primarily for deployment in branch offices, remote sites, and locations where physical […]
Kubernetes separates storage provisioning (creating storage volumes) from storage consumption (using volumes in pods) through two resource types: PersistentVolumes (PVs) and PersistentVolumeClaims (PVCs). A PersistentVolume is a piece of storage in the cluster provisioned by an administrator or dynamically by a StorageClass. A PersistentVolumeClaim is a request for storage by a user — it specifies […]
