DNS

Arch Linux — powerdns — multiple vulnerabilities (11 CVEs) — patch and remediation guide

• April 10, 2021
• Linux
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🟠 High   ⏱ 15–60 min  Last verified: 25 May 2026 Affected versions: Arch Linux (rolling release) 📖 ~4 min read  •  Source: Arch ASA ASA-201903-13 Related CVEs: CVE-2019-3871 CVE-2018-1046 CVE-2021-36754 CVE-2018-14626 CVE-2018-10851 CVE-2016-7074 CVE-2016-7073 CVE-2016-7072  +3 more Upstream summary: Type: insufficient validation. Status: Fixed. Affected: 4.1.6-2. Fixed in: 4.1.7-1. Group: AVG-927. Table of contents […]

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NetworkManager DNS Misconfiguration Breaking Yum Access

• April 9, 2021
• Tutorials
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🟡 Medium   ⏱ 5–30 min  Last verified: 9 April 2021 📖 ~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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Ubuntu 16.04 LTS – SSH login fails with Permission denied (publickey) – Fix & Prevention

• April 8, 2021
• Linux
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🟠 High   ⏱ 5–30 min  Last verified: 8 April 2021 Affected versions: Ubuntu 16.04 LTS 📖 ~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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RHEL 8 rsyslog Forwarding Stops on TLS Handshake Errors

• April 8, 2021
• Linux
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🟡 Medium   ⏱ 5–30 min  Last verified: 8 April 2021 📖 ~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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GRUB Rescue Prompt After Disk Layout Change

• April 7, 2021
• Tutorials
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🟡 Medium   ⏱ 5–30 min  Last verified: 7 April 2021 📖 ~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 Install Grafana on FreeBSD 12

• April 7, 2021
• FreeBSD
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Introduction This guide explains how to Install Grafana on FreeBSD 12 on FreeBSD 12. FreeBSD uses the pkg(8) binary package manager, rc.conf(5) for service startup configuration, and pf(4) as its primary packet filter. There is no SELinux or AppArmor — instead, FreeBSD provides the MAC (Mandatory Access Control) framework and Capsicum for fine-grained privilege separation. […]

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How to Configure CMake Build System on Debian 9

• April 7, 2021
• Linux
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Introduction How to Configure CMake Build System on Debian 9 is a fundamental operation for any administrator maintaining a Debian 9 Stretch server. Debian 9 Stretch 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 9. […]

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How to Configure PHP Session Handling on Oracle Linux 8

• April 6, 2021
• Oracle Linux
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Introduction Oracle Linux 8 ships with a stable, security-hardened base that makes deploying configure php session handling on oracle linux 8 both straightforward and auditable. This tutorial covers the complete procedure for how to Configure PHP Session Handling on Oracle Linux 8, including dnf module streams where applicable, systemd unit management, and the firewalld rules […]

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How to Configure Event Log Management on Windows Server 2019

• April 6, 2021
• Tutorials
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Introduction to Event Log Management on Windows Server 2019 Windows Event Log is the centralized logging system in Windows Server 2019 that records system events from the operating system, applications, security subsystem, and applications. Effective event log management involves configuring appropriate log sizes, setting up log forwarding for centralized collection, filtering events for analysis, creating […]

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How to Install and Configure Memcached on RHEL 7

• April 6, 2021
• Linux
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How to Install and Configure Memcached on RHEL 7 Memcached is a high-performance, distributed memory object caching system used to speed up dynamic web applications by reducing database load. It stores frequently requested data — such as database query results, session data, and rendered page fragments — in RAM, allowing subsequent requests to be served […]

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