DNS

Common Problems 119969

Debian 12: Name resolution failures with systemd-resolved

🟠 High   ⏱ 5–30 min  Last verified: 13 October 2023 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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Common Problems 120076

Debian 12 Root Partition Full from Unbounded Journal Logs

🟠 High   ⏱ 5–30 min  Last verified: 12 October 2023 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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Common Problems 114586

OOM Killer Terminates Application on RHEL 9

🟡 Medium   ⏱ 5–30 min  Last verified: 12 October 2023 📖 ~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 AppArmor Profiles on Debian 12 — step-by-step Debian 12 tutorial on Progressive Robot

How to Configure AppArmor Profiles on Debian 12

Introduction How to Configure AppArmor Profiles 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. This […]

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Common Problems 124497

Oracle Linux 9 – Common Problem 004 – Diagnosis and Fix

🟠 High   ⏱ 5–30 min  Last verified: 11 October 2023 Affected versions: Oracle Linux 9 📖 ~3 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 120069

Debian 12: WireGuard tunnel up but no traffic

🟠 High   ⏱ 5–30 min  Last verified: 11 October 2023 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 Install ClickHouse on Debian 12 — step-by-step Debian 12 tutorial on Progressive Robot

How to Install ClickHouse on Debian 12

Introduction Debian 12 Bookworm is built around the ethos of stability and free software. Setting up install clickhouse 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 and the resulting […]

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How to Set Up IPsec VPN with Libreswan on CentOS Stream 9 — step-by-step CentOS Stream 9 tutorial on Progressive Robot

How to Set Up IPsec VPN with Libreswan on CentOS Stream 9

Introduction CentOS Stream 9 ships with a stable, security-hardened base that makes deploying set up ipsec vpn with libreswan on centos stream 9 both straightforward and auditable. This tutorial covers the complete procedure for how to Set Up IPsec VPN with Libreswan on CentOS Stream 9, including dnf module streams where applicable, systemd unit management, […]

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Common Problems 114578

sudo In Automation Fails Due To Policy Or TTY Expectations

🟡 Medium   ⏱ 5–30 min  Last verified: 10 October 2023 📖 ~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 Custom Metrics with Prometheus on Oracle Linux 9 — step-by-step Oracle Linux 9 tutorial on Progressive Robot

How to Configure Custom Metrics with Prometheus on Oracle Linux 9

Introduction This tutorial demonstrates how to Configure Custom Metrics with Prometheus on Oracle Linux 9 on Oracle Linux 9. 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 9 system with […]

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