SNMP (Simple Network Management Protocol) remains the dominant standard for monitoring network devices, switches, routers, and hardware appliances that do not expose Prometheus endpoints. On RHEL 8, the net-snmp package provides both the daemon and a suite of command-line tools for querying and testing SNMP agents. This tutorial covers installing and configuring the SNMP daemon, […]
Every interactive shell session on RHEL 8 is governed by a chain of startup scripts that define environment variables, aliases, functions, and the prompt. Understanding which file is loaded and when prevents confusion around why a variable set in one terminal disappears in another, or why a cron job cannot find a command that works […]
🟡 Medium ⏱ 5–30 min Last verified: 7 September 2021 📖 ~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 […]
🟠 High ⏱ 5–30 min Last verified: 7 September 2021 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 […]
Password-based SSH authentication is vulnerable to brute-force attacks and credential stuffing. SSH key-based authentication replaces passwords with a cryptographic key pair: a private key that stays on your local machine and a public key placed on the server. Even if an attacker discovers your server’s IP and SSH port, they cannot log in without the […]
Harbor is an enterprise-grade, open-source container registry that extends the base OCI registry specification with role-based access control, project isolation, image vulnerability scanning powered by Trivy, and cross-datacenter image replication. Running your own Harbor instance on RHEL 8 gives your team a private, auditable registry with no bandwidth costs or rate-limiting imposed by Docker Hub. […]
Introduction Debian 9 Stretch is built around the ethos of stability and free software. Setting up configure hashicorp vault 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 and the […]
How to Harden Nginx: Security Headers, TLS 1.3 and OCSP Stapling on RHEL 7 A default Nginx installation exposes unnecessary information about the server software, accepts outdated and broken TLS protocol versions, and omits the HTTP security headers that modern browsers rely on for protection against cross-site scripting, clickjacking, and protocol downgrade attacks. Hardening Nginx […]
How to Use Percona XtraBackup for MySQL Hot Backups on RHEL 7 Taking reliable backups of a live MySQL or MariaDB database without interrupting application traffic is a fundamental requirement for any production system. mysqldump works for small databases but locks tables and can run for hours on large datasets. Percona XtraBackup solves this problem […]
🟠 High ⏱ 5–30 min Last verified: 31 August 2021 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 […]
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