DNS

Common Problems 117138

Ubuntu 22.04 LTS – kubelet fails because swap is enabled – Fix & Prevention

🟠 High   ⏱ 5–30 min  Last verified: 1 May 2022 Affected versions: Ubuntu 22.04 LTS (Jammy) 📖 ~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 Install MariaDB on CentOS Stream 9 — step-by-step CentOS Stream 9 tutorial on Progressive Robot

How to Install MariaDB on CentOS Stream 9

Introduction This tutorial demonstrates how to Install MariaDB on CentOS Stream 9 on CentOS Stream 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 CentOS Stream 9 system with the default AppStream […]

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How to Configure Pyenv for Multiple Python Versions on Debian 11 — step-by-step Debian 11 tutorial on Progressive Robot

How to Configure Pyenv for Multiple Python Versions on Debian 11

Introduction This guide explains how to Configure Pyenv for Multiple Python Versions on Debian 11 on Debian 11 Bullseye. Debian Bullseye 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 11 install […]

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Debian 11 — dns2tcp — vulnerability — patch and remediation guide — diagnosis and fix on Debian 11

Debian 11 — dns2tcp — vulnerability — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 30 April 2022 Affected versions: Debian 11 (bullseye) 📖 ~4 min read  •  Source: Debian Security Tracker Related CVEs: CVE-2008-3910 Upstream summary: dns2tcp before 0.4.1 does not properly handle negative values in a certain length field in the input argument to the (1) dns_simple_decode or (2) dns_decode […]

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How to Harden SMB and File Sharing on Windows Server 2012 R2 — step-by-step Windows Server 2012 R2 tutorial on Progressive Robot

How to Harden SMB and File Sharing on Windows Server 2012 R2

How to Harden SMB and File Sharing on Windows Server 2012 R2 Server Message Block (SMB) is the protocol behind Windows file sharing, named pipes, and printer sharing—and it has been a primary target for attackers for decades. From EternalBlue (MS17-010) to NTLM relay attacks, SMB vulnerabilities have enabled some of the most devastating network […]

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Common Problems 120569

Debian 11 Firewall Rules Lost After Reboot

🟠 High   ⏱ 5–30 min  Last verified: 29 April 2022 Affected versions: Debian 11 📖 ~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 116957

Ubuntu 22.04 Severe Swap Thrashing Under Memory Pressure

🟡 Medium   ⏱ 5–30 min  Last verified: 29 April 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 & Cross-Refs References & Further […]

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How to Set Up SonarQube Code Analysis on Debian 11 — step-by-step Debian 11 tutorial on Progressive Robot

How to Set Up SonarQube Code Analysis on Debian 11

Introduction How to Set Up SonarQube Code Analysis on Debian 11 is a fundamental operation for any administrator maintaining a Debian 11 Bullseye server. Debian 11 Bullseye 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 115609

RHEL 7 yum repository unreachable through enterprise proxy

🟡 Medium   ⏱ 5–30 min  Last verified: 29 April 2022 Affected versions: RHEL 7 📖 ~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 a Virtual Host in Nginx on CentOS Stream 9 — step-by-step CentOS Stream 9 tutorial on Progressive Robot

How to Configure a Virtual Host in Nginx on CentOS Stream 9

Introduction CentOS Stream 9 ships with a stable, security-hardened base that makes deploying configure a virtual host in nginx on centos stream 9 both straightforward and auditable. This tutorial covers the complete procedure for how to Configure a Virtual Host in Nginx on CentOS Stream 9, including dnf module streams where applicable, systemd unit management, […]

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