DNS

How to Configure cAdvisor Container Metrics on Debian 11 — step-by-step Debian 11 tutorial on Progressive Robot

How to Configure cAdvisor Container Metrics on Debian 11

Introduction This guide explains how to Configure cAdvisor Container Metrics 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 with the […]

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Common Problems 120608

Debian 11 – time synchronization fails causing TLS and auth errors

🟠 High   ⏱ 5–30 min  Last verified: 10 May 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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How to Configure the System Timezone on Debian 11 — step-by-step Debian 11 tutorial on Progressive Robot

How to Configure the System Timezone on Debian 11

Introduction Deploying configure the system timezone on debian 11 on a Debian 11 Bullseye machine is straightforward thanks to Debian’s policy-compliant packaging. Unlike rpm-based distributions, Debian stores configuration helpers in /etc/default/, uses update-rc.d for older init scripts, and provides dpkg-reconfigure for interactive package configuration. This tutorial stays on the systemd path throughout. Prerequisites You will […]

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Common Problems 116907

Ubuntu 22.04 Netplan Configuration Leaves Server Without Network

🟡 Medium   ⏱ 5–30 min  Last verified: 10 May 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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Common Problems 120468

Debian 11 – apt update fails because repository Release file is expired

🟠 High   ⏱ 5–30 min  Last verified: 9 May 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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How to Set Up Cron Jobs and Scheduled Tasks on Debian 11 — step-by-step Debian 11 tutorial on Progressive Robot

How to Set Up Cron Jobs and Scheduled Tasks on Debian 11

Introduction Deploying set up cron jobs and scheduled tasks on debian 11 on a Debian 11 Bullseye machine is straightforward thanks to Debian’s policy-compliant packaging. Unlike rpm-based distributions, Debian stores configuration helpers in /etc/default/, uses update-rc.d for older init scripts, and provides dpkg-reconfigure for interactive package configuration. This tutorial stays on the systemd path throughout. […]

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

Debian 11 — pdns-recursor — multiple vulnerabilities (20 CVEs) — patch and remediation guide

🟠 High   ⏱ 15–60 min  Last verified: 9 May 2022 Affected versions: Debian 11 (bullseye) 📖 ~4 min read  •  Source: Debian Security Tracker Related CVEs: CVE-2006-2069 CVE-2006-4251 CVE-2006-4252 CVE-2008-1637 CVE-2008-3217 CVE-2009-4009 CVE-2009-4010 CVE-2014-3614  +12 more Upstream summary: The recursor in PowerDNS before 3.0.1 allows remote attackers to cause a denial of service (application […]

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Common Problems 116898

Ubuntu 22.04 LTS – apt fails due to dpkg lock contention – Fix & Prevention

🟠 High   ⏱ 5–30 min  Last verified: 9 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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Debian 11 — ldns — multiple vulnerabilities (7 CVEs) — patch and remediation guide — diagnosis and fix on Debian 11

Debian 11 — ldns — multiple vulnerabilities (7 CVEs) — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 8 May 2022 Affected versions: Debian 11 (bullseye) 📖 ~4 min read  •  Source: Debian Security Tracker Related CVEs: CVE-2009-1086 CVE-2011-3581 CVE-2014-3209 CVE-2017-1000231 CVE-2017-1000232 CVE-2020-19860 CVE-2020-19861 Upstream summary: Heap-based buffer overflow in the ldns_rr_new_frm_str_internal function in ldns 1.4.x allows remote attackers to cause a denial of service […]

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Ubuntu 20.04 — pdns — multiple vulnerabilities (6 CVEs) — patch and remediation guide — diagnosis and fix on Ubuntu 20.04

Ubuntu 20.04 — pdns — multiple vulnerabilities (6 CVEs) — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 8 May 2022 Affected versions: Ubuntu 20.04 (focal) 📖 ~4 min read  •  Source: Ubuntu Security Notice USN-7203-1 Related CVEs: CVE-2018-1046 CVE-2018-10851 CVE-2018-14626 CVE-2018-14644 CVE-2020-17482 CVE-2022-27227 Upstream summary: Wei Hao discovered that PowerDNS Authoritative Server incorrectly handled memory when accessing certain files. An attacker could possibly use […]

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