Logging Monitoring

Common Problems 118502

Ubuntu 16.04 Interface Fails to Come Up After /etc/network/interfaces Edit

🟡 Medium   ⏱ 5–30 min  Last verified: 12 March 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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Common Problems 115109

RHEL 8 – Postfix Mail Queue Stalls from DNS Resolver Problems

🟡 Medium   ⏱ 5–30 min  Last verified: 12 March 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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Common Problems 113002

Windows Server 2016 — BGP route flapping between edge peers and RRAS gateway impacts WAN stability — Fix & Prevention

🟠 High   ⏱ 5–30 min  Last verified: 12 March 2021 Affected versions: Windows Server 2016 📖 ~2 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 Install Zabbix Agent on IBM AIX 7.2 — step-by-step IBM AIX 7.2 tutorial on Progressive Robot

How to Install Zabbix Agent on IBM AIX 7.2

Introduction IBM AIX 7.2 is the latest release of IBM’s enterprise-grade UNIX operating system, running on IBM Power Systems hardware. Known for its reliability, security, and performance in mission-critical environments, AIX 7.2 introduces enhanced virtualization, security hardening, and cloud integration features. This guide covers how to install zabbix agent on ibm aix 7.2 on IBM […]

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Gentoo Linux — mail-filter/opendmarc — vulnerability — patch and remediation guide — diagnosis and fix on Gentoo Linux

Gentoo Linux — mail-filter/opendmarc — vulnerability — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 25 May 2026 Affected versions: Gentoo Linux 📖 ~4 min read  •  Source: Gentoo GLSA GLSA-202011-02 Related CVEs: CVE-2020-12460 Upstream summary: It was found that OpenDMARC did not properly handle DMARC aggregate reports. Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage […]

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FreeBSD 12 — py39-fail2ban — vulnerability — patch and remediation guide — diagnosis and fix on FreeBSD 12

FreeBSD 12 — py39-fail2ban — vulnerability — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 12 March 2021 Affected versions: FreeBSD 12 📖 ~4 min read  •  Source: FreeBSD VuXML VuXML topic: fail2ban — possible RCE vulnerability in mailing action using mailutils Related CVEs: CVE-2021-32749 Upstream summary: Jakub Żoczek reports: Command mail from mailutils package used in mail actions like mail-whois can […]

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Debian 10 — sudo — multiple vulnerabilities (2 CVEs) — patch and remediation guide — diagnosis and fix on Debian 10

Debian 10 — sudo — multiple vulnerabilities (2 CVEs) — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 12 March 2021 Affected versions: Debian 10 (buster) 📖 ~4 min read  •  Source: Debian Security Tracker Related CVEs: CVE-2019-14287 CVE-2021-3156 Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution – Primary Fix Solution – Alternative Approaches Verification & […]

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How to Set Up a Multi-Node Kubernetes Cluster on Oracle Linux 8 — step-by-step Oracle Linux 8 tutorial on Progressive Robot

How to Set Up a Multi-Node Kubernetes Cluster on Oracle Linux 8

Introduction How to Set Up a Multi-Node Kubernetes Cluster on Oracle Linux 8 on Oracle Linux 8 provides administrators with a robust, enterprise-ready workflow that integrates cleanly with systemd, SELinux, firewalld, and the modern AppStream module system. In this tutorial we will walk through every step required, from package installation to verification, so that the […]

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How to Set Up S3FS FUSE Mount on FreeBSD 12 — step-by-step FreeBSD 12 tutorial on Progressive Robot

How to Set Up S3FS FUSE Mount on FreeBSD 12

Introduction How to Set Up S3FS FUSE Mount on FreeBSD 12 is a core administration task for any FreeBSD 12 server operator. FreeBSD 12 ships with the 15.0-RELEASE kernel, ZFS as the default root filesystem, Capsicum capability sandboxing improvements, and an updated ports tree. Unlike Linux distributions, FreeBSD uses rc(8) for service management, pf for […]

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Oracle Linux 8 — Certain SEV Guest Configurations Might Cause Hypervisor CPU Soft-Lockup Warnings — diagnosis and fix on Oracle Linux 8

Oracle Linux 8 — Certain SEV Guest Configurations Might Cause Hypervisor CPU Soft-Lockup Warnings (XK2-XB5-CWB)

🟠 High   ⏱ 5–30 min  Last verified: 11 March 2021 Affected versions: Oracle Linux 8 📖 ~4 min read  •  Source: Oracle Bug OLRNT-topic_xk2_xb5_cwb 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 […]

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