DNS

Common Problems 114393

RHEL 9 DNF Metadata Expired or Broken Cache

🟡 Medium   ⏱ 5–30 min  Last verified: 12 February 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 Enable FIPS Mode on Debian 12 — step-by-step Debian 12 tutorial on Progressive Robot

How to Enable FIPS Mode on Debian 12

Introduction This guide explains how to Enable FIPS Mode on Debian 12 on Debian 12 Bookworm. Debian Bookworm uses systemd for service management, nftables as the underlying packet filter (with ufw or iptables front-ends still available), and AppArmor for mandatory access control. Every command is designed for a minimal Debian 12 install with the standard […]

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How to Set Up Grafana Alerting on FreeBSD 14 — step-by-step FreeBSD 14 tutorial on Progressive Robot

How to Set Up Grafana Alerting on FreeBSD 14

Introduction How to Set Up Grafana Alerting on FreeBSD 14 is a core administration task for any FreeBSD 14 server operator. FreeBSD 14 ships with the 15.0-RELEASE kernel, ZFS as the default root filesystem, Capsicum capability sandboxing improvements, and an updated ports tree. Unlike Linux distributions, FreeBSD uses rc(8) for service management, pf for packet […]

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How to Configure Apache2 MPM Worker on Debian 12 — step-by-step Debian 12 tutorial on Progressive Robot

How to Configure Apache2 MPM Worker on Debian 12

Introduction How to Configure Apache2 MPM Worker on Debian 12 is a fundamental operation for any administrator maintaining a Debian 12 Bookworm server. Debian 12 Bookworm ships with the Linux 6.12 kernel, updated toolchains, and a fully refreshed package archive — meaning version numbers, configuration file paths, and some dependency chains differ from Debian 12. […]

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Common Problems 120171

Debian 12 – MariaDB fails to start due to InnoDB corruption

🔴 Critical   ⏱ 5–30 min  Last verified: 8 February 2024 Affected versions: Debian 12 📖 ~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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How to Set Up SSH Key Authentication on Debian 12 — step-by-step Debian 12 tutorial on Progressive Robot

How to Set Up SSH Key Authentication on Debian 12

Introduction Debian 12 Bookworm is built around the ethos of stability and free software. Setting up set up ssh key authentication on debian 12 on Bookworm leverages the same proven Debian packaging system that powers millions of servers worldwide, while benefiting from the latest upstream releases included in the Bookworm freeze. Follow each step carefully […]

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NetBSD 9.4 — unbound — multiple vulnerabilities (20 CVEs) — patch and remediation guide — diagnosis and fix on NetBSD 9.4

NetBSD 9.4 — unbound — multiple vulnerabilities (20 CVEs) — patch and remediation guide

🟠 High   ⏱ 15–60 min  Last verified: 25 May 2026 Affected versions: NetBSD 9.4 📖 ~4 min read  •  Source: pkgsrc audit-packages entry Related CVEs: CVE-2019-18934 CVE-2020-12663 CVE-2009-3602 CVE-2017-15105 CVE-2020-12662 CVE-2020-28935 CVE-2019-25031 CVE-2019-25032  +12 more Upstream summary: pkgsrc audit-packages flagged unbound<1.9.5 for vulnerability class 'arbitrary-code-execution'. Reference: https://nvd.nist.gov/vuln/detail/CVE-2019-18934 Table of contents Symptom & Impact Environment […]

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How to Set Up WireGuard VPN on FreeBSD 14 — step-by-step FreeBSD 14 tutorial on Progressive Robot

How to Set Up WireGuard VPN on FreeBSD 14 (ON-FREEBSD-14)

Introduction This guide explains how to Set Up WireGuard VPN 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 for fine-grained […]

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Amazon Linux 2 — python-dns — vulnerability — patch and remediation guide — diagnosis and fix on Amazon Linux 2

Amazon Linux 2 — python-dns — vulnerability — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 25 May 2026 Affected versions: Amazon Linux 2 📖 ~4 min read  •  Source: Amazon Linux advisory ALAS2-2024-2647 Related CVEs: CVE-2023-29483 Upstream summary: eventlet before 0.35.2, as used in dnspython before 2.6.0, allows remote attackers to interfere with DNS name resolution by quickly sending an invalid packet […]

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Oracle Linux 8 — bind9.16 — vulnerability — patch and remediation guide — diagnosis and fix on Oracle Linux 8

Oracle Linux 8 — bind9.16 — vulnerability — patch and remediation guide (ELSA-2023-4100)

🟠 High   ⏱ 15–60 min  Last verified: 1 February 2024 Affected versions: Oracle Linux 8 📖 ~4 min read  •  Source: ELSA advisory ELSA-2023-4100 Related CVEs: CVE-2023-2828 Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution – Primary Fix Solution – Alternative Approaches Verification & Acceptance […]

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