Zabbix is a mature, enterprise-grade open-source monitoring platform capable of tracking availability, performance, and log data for thousands of hosts from a single server. It ships with auto-discovery, customizable triggers, rich alerting integrations, and a polished web interface. Installing Zabbix 6.x on RHEL 8 takes roughly thirty minutes and gives you production-ready monitoring backed by […]
Prometheus and Grafana are two of the most widely adopted open-source tools for infrastructure monitoring and metrics visualization. Prometheus scrapes and stores time-series data from your systems, while Grafana turns that data into rich, interactive dashboards. Together they give RHEL 8 administrators a powerful, production-ready observability stack. This tutorial walks through installing both tools from […]
Linux Unified Key Setup (LUKS) is the standard disk encryption layer on RHEL 8, built on the dm-crypt kernel module and managed through the cryptsetup utility. Encrypting partitions with LUKS ensures that data is unreadable without the correct passphrase or key file, even if physical media is stolen or a drive is decommissioned without secure […]
File Integrity Monitoring (FIM) detects unauthorized changes to critical system files, binaries, and configuration directories — a key control for detecting intrusions and satisfying compliance requirements such as PCI-DSS and CIS benchmarks. Tripwire Open Source computes cryptographic hashes of monitored files at a baseline and alerts you to any subsequent modifications. This tutorial covers installing […]
HTTP security headers instruct browsers how to handle your site’s content and protect visitors from clickjacking, cross-site scripting, MIME sniffing, and other common attacks. Adding these headers to Nginx or Apache on RHEL 8 is a high-value, low-effort hardening step that improves both your security posture and your score on tools like securityheaders.com. This tutorial […]
OpenVAS (Open Vulnerability Assessment System), now distributed as Greenbone Community Edition, is a powerful open-source vulnerability scanner that identifies known CVEs, misconfigurations, and weak credentials across your network. Running it as a containerized stack on RHEL 8 keeps the scanner isolated and easy to update without conflicting with system packages. This tutorial covers deploying Greenbone […]
DNS Security Extensions (DNSSEC) protect against cache poisoning and spoofing by cryptographically signing DNS records. On RHEL 8, you can enforce DNSSEC validation using either BIND 9 or Unbound, both available in the default repositories. This tutorial walks through configuring a validating resolver, testing zone signatures, and detecting failures. Securing your resolver is a foundational […]
Running your own Certificate Authority (CA) with OpenSSL gives you complete control over the certificates issued to your internal services, enabling mutual TLS, encrypted internal APIs, and custom certificate policies without relying on commercial CAs for private infrastructure. On RHEL 8, OpenSSL is pre-installed and the system trust store is managed through the ca-trust framework, […]
SELinux Mandatory Access Control (MAC) confines processes to only the resources they legitimately need, limiting the damage an attacker can do even after exploiting a vulnerability. While RHEL 8 ships with broad pre-built policies for common services, custom applications often generate AVC (Access Vector Cache) denial messages because no policy exists for them yet. Rather […]
HashiCorp Vault is an industry-standard secrets management platform that stores, generates, and controls access to sensitive values such as API keys, database passwords, TLS certificates, and encryption keys. Unlike storing secrets in environment variables or configuration files, Vault provides audit logging, dynamic credentials with short TTLs, and fine-grained access policies. On RHEL 8, Vault installs […]
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