DNS

How to Install and Configure Varnish Cache on Debian 11 — step-by-step Debian 11 tutorial on Progressive Robot

How to Install and Configure Varnish Cache on Debian 11

Introduction How to Install and Configure Varnish Cache 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 120521

Debian 11 – resolv.conf Keeps Reverting and DNS Fails – Resolver Control

🟠 High   ⏱ 5–30 min  Last verified: 19 May 2026 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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How to Set Up HTTP/3 QUIC on Nginx on Debian 11 — step-by-step Debian 11 tutorial on Progressive Robot

How to Set Up HTTP/3 QUIC on Nginx on Debian 11

Introduction How to Set Up HTTP/3 QUIC on Nginx 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 […]

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How to Install and Use Helm for Kubernetes Package Management on RHEL 7 — step-by-step RHEL 7 tutorial on Progressive Robot

How to Install and Use Helm for Kubernetes Package Management on RHEL 7

How to Install and Use Helm for Kubernetes Package Management on RHEL 7 Helm is the de facto package manager for Kubernetes, often described as the “apt” or “yum” of the container orchestration world. Rather than maintaining dozens of raw YAML manifests for every application you deploy, Helm bundles them into versioned, reusable packages called […]

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How to Enable ClamAV Antivirus on Debian 11 — step-by-step Debian 11 tutorial on Progressive Robot

How to Enable ClamAV Antivirus on Debian 11

Introduction How to Enable ClamAV Antivirus 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 11. This […]

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Common Problems 120508

Debian 11 – unattended-upgrades lock prevents manual apt operations

🟡 Medium   ⏱ 5–30 min  Last verified: 19 May 2026 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 117099

Ubuntu 22.04 LTS – apt mirror returns 404 for jammy updates

🟡 Medium   ⏱ 5–30 min  Last verified: 20 May 2026 Affected versions: Ubuntu 22.04 LTS Ubuntu 22.04 Ubuntu 22.04.4 📖 ~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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Debian 11 — dnsmasq — multiple vulnerabilities (20 CVEs) — patch and remediation guide — diagnosis and fix on Debian 11

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

🟠 High   ⏱ 15–60 min  Last verified: 25 May 2026 Affected versions: Debian 11 (bullseye) 📖 ~4 min read  •  Source: Debian Security Tracker Related CVEs: CVE-2005-0876 CVE-2005-0877 CVE-2006-2017 CVE-2008-1447 CVE-2008-3214 CVE-2008-3350 CVE-2009-2957 CVE-2009-2958  +12 more Upstream summary: Off-by-one buffer overflow in Dnsmasq before 2.21 may allow attackers to execute arbitrary code via the […]

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How to Perform a CIS Benchmark Audit on Debian 11 — step-by-step Debian 11 tutorial on Progressive Robot

How to Perform a CIS Benchmark Audit on Debian 11

Introduction How to Perform a CIS Benchmark Audit 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 120488

Debian 11 – dpkg was interrupted and package configuration is incomplete

🟠 High   ⏱ 5–30 min  Last verified: 19 May 2026 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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