DNS

How to Install Checkmk on Debian 13 — step-by-step Debian 13 tutorial on Progressive Robot

How to Install Checkmk on Debian 13

Introduction Debian 13 Trixie is built around the ethos of stability and free software. Setting up install checkmk on Trixie leverages the same proven Debian packaging system that powers millions of servers worldwide, while benefiting from the latest upstream releases included in the Trixie freeze. Follow each step carefully and the resulting configuration will persist […]

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How to Install TimescaleDB on Debian 13 — step-by-step Debian 13 tutorial on Progressive Robot

How to Install TimescaleDB on Debian 13

Introduction Debian 13 Trixie is built around the ethos of stability and free software. Setting up install timescaledb on Trixie leverages the same proven Debian packaging system that powers millions of servers worldwide, while benefiting from the latest upstream releases included in the Trixie freeze. Follow each step carefully and the resulting configuration will persist […]

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Common Problems 119576

Debian 13 Journal Logs Grow Unbounded and Consume Disk

🟡 Medium   ⏱ 5–30 min  Last verified: 8 November 2025 📖 ~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 SSH Key-Based Authentication on Debian 13 — step-by-step Debian 13 tutorial on Progressive Robot

How to Set Up SSH Key-Based Authentication on Debian 13

Introduction This guide explains how to Set Up SSH Key-Based Authentication on Debian 13 on Debian 13 Trixie. Debian Trixie 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 13 install with […]

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Common Problems 113974

RHEL 10 – SELinux Denies Custom Application Port Access – Label and Policy Fix

🟠 High   ⏱ 5–30 min  Last verified: 7 November 2025 Affected versions: RHEL 10.0 RHEL 10.1 📖 ~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 […]

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

NetBSD 9.4 — powerdns-recursor — 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-2012-1193 CVE-2020-10995 CVE-2020-12244 CVE-2020-14196 CVE-2022-27227 CVE-2023-22617 CVE-2025-30195 CVE-2025-30192  +12 more Upstream summary: pkgsrc audit-packages flagged powerdns-recursor<3.1.7.2 for vulnerability class 'arbitrary-code-execution'. Reference: http://doc.powerdns.com/powerdns-advisory-2010-01.html Table of contents Symptom & Impact Environment […]

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How to Secure Apache with Let's Encrypt and Certbot on RHEL 9 — step-by-step RHEL 9 tutorial on Progressive Robot

How to Secure Apache with Let’s Encrypt and Certbot on RHEL 9

Like Nginx, Apache can be secured with free SSL/TLS certificates from Let’s Encrypt using Certbot. The python3-certbot-apache plugin performs domain validation, obtains the certificate, and automatically updates your Apache virtual host configuration with the SSL directives, HTTP-to-HTTPS redirect, and modern cipher settings. This guide covers installing Certbot on RHEL 9, obtaining a certificate for your […]

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How to Set Up HTTP/3 with Nginx on Debian 13 — step-by-step Debian 13 tutorial on Progressive Robot

How to Set Up HTTP/3 with Nginx on Debian 13

Introduction Debian 13 Trixie is built around the ethos of stability and free software. Setting up set up http/3 with nginx on Trixie leverages the same proven Debian packaging system that powers millions of servers worldwide, while benefiting from the latest upstream releases included in the Trixie freeze. Follow each step carefully and the resulting […]

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Common Problems 127094

CentOS Stream 10 – Common Problem 188 – Diagnosis and Fix

🟡 Medium   ⏱ 5–30 min  Last verified: 6 November 2025 Affected versions: CentOS Stream 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 & Hardening Related Errors […]

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Common Problems 124168

Oracle Linux 10 – Postfix starts but mail remains deferred due to SELinux policy denial – Fix & Prevention

🟠 High   ⏱ 5–30 min  Last verified: 6 November 2025 Affected versions: Oracle Linux 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 & Hardening Related Errors […]

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