DNS

Common Problems 113979

RHEL 10 – firewalld port opens temporarily but closes after reboot – Fix & Prevention

🟡 Medium   ⏱ 5–30 min  Last verified: 30 April 2026 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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Common Problems 115992

Ubuntu 26.04 LTS – SSH service fails to start after configuration change – Fix & Prevention

🟠 High   ⏱ 5–30 min  Last verified: 30 April 2026 Affected versions: Ubuntu 26.04 LTS 📖 ~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 115889

Ubuntu 26.04 LTS – apt lock prevents installs and updates – Fix & Prevention

🟠 High   ⏱ 5–30 min  Last verified: 30 April 2026 Affected versions: Ubuntu 26.04 LTS 📖 ~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 115942

Ubuntu 26.04 LTS – boot drops into emergency mode due to /etc/fstab errors – Fix & Prevention

🟠 High   ⏱ 5–30 min  Last verified: 30 April 2026 Affected versions: Ubuntu 26.04 LTS 📖 ~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 116129

Ubuntu 26.04 LTS – OpenSSH denies key auth after hardening changes

🟠 High   ⏱ 5–30 min  Last verified: 30 April 2026 Affected versions: Ubuntu 26.04 LTS Ubuntu 26.04 Ubuntu 26.04.1 📖 ~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 […]

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How to Set Up OpenTelemetry Collector on Oracle Linux 10 — step-by-step Oracle Linux 10 tutorial on Progressive Robot

How to Set Up OpenTelemetry Collector on Oracle Linux 10

Introduction This tutorial demonstrates how to Set Up OpenTelemetry Collector on Oracle Linux 10 on Oracle Linux 10. 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 10 system with the […]

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How to Install Graylog on RHEL 10 — step-by-step RHEL 10 tutorial on Progressive Robot

How to Install Graylog on RHEL 10

Introduction How to Install Graylog on RHEL 10 on RHEL 10 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 configuration is reproducible and production-safe. […]

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How to Install Forgejo on RHEL 10 — step-by-step RHEL 10 tutorial on Progressive Robot

How to Install Forgejo on RHEL 10

Introduction This tutorial demonstrates how to Install Forgejo on RHEL 10 on RHEL 10. 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 RHEL 10 system with the default AppStream repositories enabled. Prerequisites […]

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Debian 11 — dnsdist — multiple vulnerabilities (20 CVEs) — patch and remediation guide — diagnosis and fix on Debian 11

Debian 11 — dnsdist — multiple vulnerabilities (20 CVEs) — patch and remediation guide

🟠 High   ⏱ 15–60 min  Last verified: 27 April 2026 Affected versions: Debian 11 (bullseye) 📖 ~4 min read  •  Source: Debian Security Tracker Related CVEs: CVE-2016-7069 CVE-2017-7557 CVE-2018-14663 CVE-2023-44487 CVE-2025-30193 CVE-2026-0396 CVE-2026-0397 CVE-2026-24028  +12 more Upstream summary: An issue has been found in dnsdist before 1.2.0 in the way EDNS0 OPT records are […]

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Common Problems 114073

RHEL 10 – grub kernel parameter change not applied after update – Fix & Prevention

🟠 High   ⏱ 5–30 min  Last verified: 27 April 2026 Affected versions: RHEL 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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