DNS

Arch Linux — libmicrodns — multiple vulnerabilities (7 CVEs) — patch and remediation guide — diagnosis and fix on Arch Linux

Arch Linux — libmicrodns — multiple vulnerabilities (7 CVEs) — patch and remediation guide

🔴 Critical   ⏱ 15–90 min  Last verified: 25 May 2026 Affected versions: Arch Linux (rolling release) 📖 ~4 min read  •  Source: Arch ASA ASA-202004-24 Related CVEs: CVE-2020-6080 CVE-2020-6079 CVE-2020-6078 CVE-2020-6077 CVE-2020-6073 CVE-2020-6072 CVE-2020-6071 Upstream summary: Type: multiple issues. Status: Fixed. Affected: 0.1.0-1. Fixed in: 0.1.2-1. Group: AVG-1136. Table of contents Symptom & Impact […]

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Common Problems 117967

Ubuntu 18.04 Sudo Stops Working for Admin Group Users

🟡 Medium   ⏱ 5–30 min  Last verified: 11 May 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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Common Problems 117536

Ubuntu 20.04 GRUB Rescue Prompt on Startup

🟡 Medium   ⏱ 5–30 min  Last verified: 11 May 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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How to Configure OpenTelemetry Collector on Oracle Linux 8 — step-by-step Oracle Linux 8 tutorial on Progressive Robot

How to Configure OpenTelemetry Collector on Oracle Linux 8

Introduction This tutorial demonstrates how to Configure OpenTelemetry Collector on Oracle Linux 8 on Oracle Linux 8. It is written for administrators who want a repeatable, well-explained walkthrough that goes beyond a bare command list and explains each configuration choice. Every command is tested against a freshly registered Oracle Linux 8 system with the default […]

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Common Problems 113446

Windows Server 2012 R2 – NVMe stornvme timeout storms trigger disk failover – Fix and Prevention

🟠 High   ⏱ 5–30 min  Last verified: 10 May 2021 Affected versions: Windows Server 2012 R2 📖 ~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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How to Configure Percona XtraBackup on Debian 9 — step-by-step Debian 9 tutorial on Progressive Robot

How to Configure Percona XtraBackup on Debian 9

Introduction Debian 9 Stretch is built around the ethos of stability and free software. Setting up configure percona xtrabackup on debian 9 on Stretch leverages the same proven Debian packaging system that powers millions of servers worldwide, while benefiting from the latest upstream releases included in the Stretch freeze. Follow each step carefully and the […]

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Common Problems 121641

Debian 9 – Apache2 Fails with Address Already in Use – Port Conflict Resolution

🟠 High   ⏱ 5–30 min  Last verified: 9 May 2021 Affected versions: Debian 9 📖 ~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 Use Skopeo for Container Images on Oracle Linux 8 — step-by-step Oracle Linux 8 tutorial on Progressive Robot

How to Use Skopeo for Container Images on Oracle Linux 8

Introduction How to Use Skopeo for Container Images on Oracle Linux 8 on Oracle Linux 8 provides administrators with a robust, enterprise-ready workflow that integrates cleanly with systemd, SELinux, firewalld, and the modern AppStream module system. In this tutorial we will walk through every step required, from package installation to verification, so that the resulting […]

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Common Problems 115468

RHEL 7 service httpd Fails with Permission Denied on Logs

🟡 Medium   ⏱ 5–30 min  Last verified: 8 May 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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How to Install PHP 8.2 on Oracle Linux 8 — step-by-step Oracle Linux 8 tutorial on Progressive Robot

How to Install PHP 8.2 on Oracle Linux 8

Introduction Setting up install php 8.2 on oracle linux 8 on a Oracle Linux 8 server is a common task for system administrators, DevOps engineers, and site reliability engineers. This guide explains how to Install PHP 8.2 on Oracle Linux 8, with all the commands you need, the SELinux and firewalld considerations to keep in […]

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