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 […]
Varnish Cache is a high-performance HTTP accelerator designed to sit in front of web servers and serve cached responses at near-wire speed, offloading PHP and database work from your backend. On RHEL 8, Varnish is packaged in the default AppStream repository, making installation straightforward. This guide shows how to install Varnish, write a VCL configuration […]
🟡 Medium ⏱ 5–30 min Last verified: 24 July 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 […]
Docker Compose lets you define and run multi-container applications from a single YAML file, eliminating the need to string together long docker run commands. On RHEL 8, you can install it either as a plugin that integrates directly with the docker CLI (the modern approach) or as a standalone binary for environments that require a […]
🟠 High ⏱ 5–30 min Last verified: 20 July 2021 Affected versions: 8.4 8.5 8.6 8.7 8.8 8.9 8.10 📖 ~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 […]
A default PostgreSQL installation on RHEL 8 only accepts connections from the local machine over a Unix socket. To allow client applications on other hosts to connect, you must configure the server to listen on a network interface, update the host-based authentication file, open the firewall port, and enable SSL so that credentials and data […]
Even with SSH key-based authentication enabled, your server’s SSH port is still probed constantly by automated scanners. Fail2Ban monitors log files for repeated authentication failures and bans offending IP addresses by inserting temporary rules into the firewall. On RHEL 8, Fail2Ban integrates natively with firewalld, making it the right tool to complement the hardening steps […]
Maven and Gradle are the two dominant build tools in the Java ecosystem, and knowing how to use both gives you flexibility across different project types and team conventions. Maven provides a well-defined project structure and a massive central repository of dependencies, while Gradle offers a Groovy or Kotlin DSL with faster incremental builds and […]
🟡 Medium ⏱ 5–30 min Last verified: 8 July 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 […]
🟡 Medium ⏱ 5–30 min Last verified: 6 July 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 […]
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