Boot Startup

Common Problems 114559

Cockpit Web Console Unreachable After Hardening

🟡 Medium   ⏱ 5–30 min  Last verified: 6 July 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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How to Harden the Linux Kernel with sysctl on RHEL 9 — step-by-step RHEL 9 tutorial on Progressive Robot

How to Harden the Linux Kernel with sysctl on RHEL 9

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 […]

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Common Problems 122702

Boot Loader Variables Not Persisting Across Reboot

🟡 Medium   ⏱ 5–30 min  Last verified: 20 June 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 & […]

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Common Problems 114596

RHEL 9 Fails to Boot After Kernel Update

🟡 Medium   ⏱ 5–30 min  Last verified: 16 June 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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How to Set Up Uptime Kuma for Service Monitoring on RHEL 9 — step-by-step RHEL 9 tutorial on Progressive Robot

How to Set Up Uptime Kuma for Service Monitoring on RHEL 9

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 […]

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Common Problems 114467

Kernel Module Missing After RHEL 9 Update

🟡 Medium   ⏱ 5–30 min  Last verified: 4 June 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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Ubuntu 22.04 — twitter-bootstrap3 — multiple vulnerabilities (3 CVEs) — patch and remediation guide — diagnosis and fix on Ubuntu 22.04

Ubuntu 22.04 — twitter-bootstrap3 — multiple vulnerabilities (3 CVEs) — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 3 June 2024 Affected versions: Ubuntu 22.04 (jammy) 📖 ~4 min read  •  Source: Ubuntu Security Notice USN-7556-1 Related CVEs: CVE-2024-6484 CVE-2024-6531 CVE-2024-6485 Upstream summary: It was discovered that Bootstrap did not correctly sanitize certain input in the carousel component. An attacker could possibly use this issue […]

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Common Problems 114601

RHEL 9 Kernel Panic After Third-Party Driver Installation

🟡 Medium   ⏱ 5–30 min  Last verified: 22 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 […]

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How to Deploy a Django App with Gunicorn on FreeBSD 14 — step-by-step FreeBSD 14 tutorial on Progressive Robot

How to Deploy a Django App with Gunicorn on FreeBSD 14

Introduction This guide explains how to Deploy a Django App with Gunicorn on FreeBSD 14 on FreeBSD 14. FreeBSD uses the pkg(8) binary package manager, rc.conf(5) for service startup configuration, and pf(4) as its primary packet filter. There is no SELinux or AppArmor — instead, FreeBSD provides the MAC (Mandatory Access Control) framework and Capsicum […]

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Debian 12 — grub — multiple vulnerabilities (2 CVEs) — patch and remediation guide — diagnosis and fix on Debian 12

Debian 12 — grub — multiple vulnerabilities (2 CVEs) — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 19 May 2024 Affected versions: Debian 12 (bookworm) 📖 ~4 min read  •  Source: Debian Security Tracker Related CVEs: CVE-2008-3896 CVE-2023-4949 Upstream summary: Grub Legacy 0.97 and earlier stores pre-boot authentication passwords in the BIOS Keyboard buffer and does not clear this buffer before and after use, […]

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