How to Install Certbot and Automate Let’s Encrypt Renewals on RHEL 7 Securing your web server with a trusted TLS certificate is no longer optional — it is a baseline requirement for any production site. Let’s Encrypt provides free, automated, and domain-validated certificates, and Certbot is the official command-line client that manages the entire lifecycle: […]
🟢 Low ⏱ 5–30 min Last verified: 7 November 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 […]
How to Configure Chrony as a Time Server on RHEL 7 Accurate system time is foundational to almost every enterprise workload. Kerberos authentication, TLS certificate validation, log correlation, and database replication all depend on clocks that stay in sync. While ntpd has served Linux administrators for decades, Red Hat Enterprise Linux 7 ships Chrony as […]
Introduction FreeBSD 12 is a UNIX-derived operating system renowned for its network stack performance, ZFS integration, and Jail isolation primitives. Setting up install sonarqube on freebsd 12 on FreeBSD 12 follows the rc.conf/service(8) paradigm rather than systemd, which means enabling a service and configuring its startup options are done differently from any Linux distribution. This […]
Introduction Hyper-V Shielded VMs on Windows Server 2016 protect virtual machines from malicious host administrators, rogue hypervisors, and unauthorised VM cloning. A Shielded VM is encrypted using BitLocker and can only run on trusted Hyper-V hosts that have passed attestation — a health verification process conducted by the Host Guardian Service (HGS). Even if an […]
Introduction Debian 9 Stretch is built around the ethos of stability and free software. Setting up set up nexus repository manager on debian 9 on Stretch leverages the same proven Debian packaging system that powers millions of servers worldwide, while benefiting from the latest upstream releases included in the Stretch freeze. Follow each step carefully […]
How to Set Up Windows Server 2019 Network Controller Network Controller is a Software Defined Networking (SDN) component available in Windows Server 2019 Datacenter edition that provides a centralized, programmable point of automation for virtual and physical network infrastructure management. Network Controller manages Hyper-V virtual networks, software load balancers, RAS Gateways, and Network Security Groups. […]
Introduction This guide explains how to Set Up Nagios 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 standard […]
🟡 Medium ⏱ 5–30 min Last verified: 31 October 2019 Affected versions: Windows Server 2016 📖 ~2 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 to Health Attestation Service on Windows Server 2019 Windows Device Health Attestation (DHA) is a security feature that allows organizations to verify the boot-time integrity of Windows devices using measurements stored in the Trusted Platform Module (TPM). The Health Attestation Service on Windows Server 2019 is the on-premises server component that collects, validates, and […]
