The ELK Stack — Elasticsearch, Logstash, and Kibana — is a battle-tested open-source platform for centralizing, parsing, and visualizing log data at scale. Elasticsearch stores and indexes logs, Logstash ingests and transforms them, and Kibana provides a browser-based interface for searching and dashboarding. Running the ELK Stack on RHEL 9 gives you a self-hosted alternative […]
Prometheus and Grafana are a powerful open-source monitoring stack widely used in production Linux environments. Prometheus collects and stores time-series metrics, while Grafana provides rich dashboards and alerting on top of that data. Together they give you deep visibility into system performance, resource utilization, and application health. This tutorial walks through installing both on RHEL […]
LUKS (Linux Unified Key Setup) is the standard disk encryption framework on Linux, providing transparent block-level encryption that protects data at rest even if physical media is stolen. On RHEL 9, LUKS is backed by the cryptsetup tool and integrates tightly with the kernel’s device mapper subsystem. This tutorial walks through encrypting a new disk […]
File Integrity Monitoring (FIM) detects unauthorised modifications to critical system files — a key indicator of compromise that antivirus and network monitoring tools often miss. Tripwire is a battle-tested open-source FIM tool that creates a cryptographic hash database of your filesystem and alerts you when files are added, modified, or deleted. On RHEL 9, Tripwire […]
HTTP security headers are a lightweight but highly effective layer of defence for web applications, instructing browsers to enforce policies that mitigate common attacks like clickjacking, MIME-type sniffing, cross-site scripting (XSS), and protocol downgrade attacks. HSTS (HTTP Strict Transport Security) forces browsers to use HTTPS exclusively, while a Content Security Policy (CSP) controls which resources […]
OpenVAS, now distributed as Greenbone Community Edition (GCE), is one of the most comprehensive open-source vulnerability scanners available, capable of identifying thousands of known CVEs across network services, web applications, and operating system configurations. Installing it natively on RHEL 9 requires complex dependency management, so the recommended approach is to deploy it via Docker Compose, […]
DNSSEC (DNS Security Extensions) adds cryptographic signatures to DNS records, protecting against cache poisoning and DNS spoofing attacks where an attacker forges DNS responses to redirect users to malicious sites. On RHEL 9, BIND9 is the standard DNS server and includes full DNSSEC support out of the box. This tutorial walks through enabling DNSSEC validation, […]
A private Certificate Authority (CA) lets you issue and manage TLS certificates for internal services without paying a public CA for every certificate. On RHEL 9, OpenSSL provides all the tools needed to build a two-tier CA hierarchy: a root CA (kept offline and highly protected) and an intermediate CA (used for day-to-day signing). This […]
SELinux (Security-Enhanced Linux) enforces Mandatory Access Control (MAC) on RHEL 9, confining processes to only the resources they are explicitly permitted to access regardless of traditional Unix file permissions. While RHEL ships with comprehensive base policies, custom applications often generate AVC (Access Vector Cache) denials because their access patterns are not covered by existing policy […]
HashiCorp Vault is an open-source secrets management platform that provides secure storage, access control, and auditing for sensitive data such as API keys, passwords, certificates, and encryption keys. Instead of hardcoding secrets in application configs or environment variables, applications request them from Vault at runtime using short-lived tokens or AppRole credentials. This tutorial covers installing […]
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