DNS

Common Problems 114413

RHEL 9 firewalld blocks expected application traffic

🟡 Medium   ⏱ 5–30 min  Last verified: 20 June 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 Set Up SonarQube Code Analysis on Debian 12 — step-by-step Debian 12 tutorial on Progressive Robot

How to Set Up SonarQube Code Analysis on Debian 12

Introduction This guide explains how to Set Up SonarQube Code Analysis 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 […]

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How to Configure Windows Performance Monitor (perfmon) on Windows Server 2022 — step-by-step Windows Server 2022 tutorial on Progressive Robot

How to Configure Windows Performance Monitor (perfmon) on Windows Server 2022

Overview of Windows Performance Monitor on Windows Server 2022 Windows Performance Monitor (perfmon) is the built-in performance data collection and analysis tool included in every edition of Windows Server. On Windows Server 2022 it provides access to thousands of performance counters sourced from the OS kernel, hardware drivers, and installed applications. The tool operates in […]

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Common Problems 120183

Debian 12 – Certbot Renewal Fails in Automation – Reliable ACME Recovery

🟠 High   ⏱ 5–30 min  Last verified: 20 June 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 121584

Debian 9 – UFW policy blocks package downloads and outbound HTTPS

🟡 Medium   ⏱ 5–30 min  Last verified: 19 June 2023 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 Configure Grafana Loki on Oracle Linux 9 — step-by-step Oracle Linux 9 tutorial on Progressive Robot

How to Configure Grafana Loki on Oracle Linux 9

Introduction Setting up configure grafana loki on oracle linux 9 on a Oracle Linux 9 server is a common task for system administrators, DevOps engineers, and site reliability engineers. This guide explains how to Configure Grafana Loki on Oracle Linux 9, with all the commands you need, the SELinux and firewalld considerations to keep in […]

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Common Problems 120011

Debian 12 – resolv.conf Keeps Reverting and DNS Fails – Resolver Control

🟠 High   ⏱ 5–30 min  Last verified: 19 June 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 117437

Ubuntu 20.04 /boot Partition Full

🟡 Medium   ⏱ 5–30 min  Last verified: 19 June 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 Set Up HAProxy Load Balancer on Debian 12 — step-by-step Debian 12 tutorial on Progressive Robot

How to Set Up HAProxy Load Balancer on Debian 12

Introduction How to Set Up HAProxy Load Balancer 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 […]

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Common Problems 111717

Windows Server 2022 — DHCP failover communication interrupted between partners — Fix & Prevention

🟡 Medium   ⏱ 5–30 min  Last verified: 19 June 2023 Affected versions: Windows Server 2022 📖 ~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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