The Linux kernel exposes hundreds of tunable parameters through the sysctl interface that control network behavior, memory protection, and file system security. Many of these defaults prioritize compatibility over security. By writing a hardening configuration to /etc/sysctl.d/, you can reduce the kernel attack surface, enable mitigations against common network attacks, and enforce memory safety features […]
Uptime Kuma is a self-hosted monitoring tool that provides a clean web dashboard for tracking uptime across HTTP endpoints, TCP ports, DNS records, Docker containers, and more. On RHEL 9, you can run it directly with Node.js and PM2 for process management, or deploy it instantly via Docker. This tutorial walks through both approaches, firewall […]
🟡 Medium ⏱ 5–30 min Last verified: 26 May 2024 📖 ~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: 15 May 2024 Affected versions: FreeBSD 14 📖 ~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 & […]
Prometheus Alertmanager handles routing, deduplication, and delivery of alerts fired by Prometheus to external notification channels. On RHEL 9, integrating Alertmanager with PagerDuty and Slack allows teams to receive critical pages and contextual chat notifications from a single alert pipeline. This tutorial walks through downloading the Alertmanager binary, configuring a complete route tree, setting up […]
iptables has been the standard Linux packet-filtering firewall for over two decades, and while RHEL 9 ships with nftables and firewalld as the preferred tools, iptables remains available and is widely understood by seasoned administrators. Learning iptables gives you deep insight into how Linux netfilter works and is valuable for managing legacy systems or containers […]
Graylog is an open-source centralised log management platform that collects, indexes, and analyses log data from across your infrastructure in one place. On RHEL 9, deploying Graylog 5.x gives operations teams powerful search, alerting, and dashboarding capabilities without relying on cloud-based log services. Graylog depends on MongoDB for metadata storage and OpenSearch (or Elasticsearch) for […]
🟡 Medium ⏱ 5–30 min Last verified: 31 March 2024 📖 ~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 […]
Podman is RHEL 9’s default container engine and, unlike Docker, runs entirely rootless and integrates natively with systemd. Socket activation is a systemd feature that lets the kernel hold a listening socket open while the service is stopped; the moment the first connection arrives, systemd starts the corresponding service and hands the socket over. This […]
🟡 Medium ⏱ 5–30 min Last verified: 19 March 2024 📖 ~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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