Troubleshooting

Common Problems 115104

kdump Not Capturing Kernel Crash Dumps

🟡 Medium   ⏱ 5–30 min  Last verified: 27 July 2020 📖 ~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 Debian 10 Buster on a Server — step-by-step Debian 10 tutorial on Progressive Robot

How to Install Debian 10 Buster on a Server

Introduction Debian 10 Buster is built around the ethos of stability and free software. Setting up install debian 10 buster on a server on Buster leverages the same proven Debian packaging system that powers millions of servers worldwide, while benefiting from the latest upstream releases included in the Buster freeze. Follow each step carefully and […]

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Common Problems 113401

Windows Server 2012 R2 — AD account repeatedly locked out moments after unlock — Fix & Prevention

🟠 High   ⏱ 5–30 min  Last verified: 27 July 2020 Affected versions: Windows Server 2012 R2 📖 ~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 […]

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Common Problems 112411

Windows Server 2019 – Failover cluster loses quorum after witness outage – Fix & Prevention

🟠 High   ⏱ 5–30 min  Last verified: 27 July 2020 Affected versions: Windows Server 2019 📖 ~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 Deploy Applications with Docker Compose on RHEL 7 — step-by-step RHEL 7 tutorial on Progressive Robot

How to Deploy Applications with Docker Compose on RHEL 7

How to Deploy Applications with Docker Compose on RHEL 7 Docker Compose lets you define and run multi-container applications using a single YAML file. Instead of managing individual docker run commands for each service, you describe the entire application stack — web server, database, cache, message queue — in a docker-compose.yml file and bring everything […]

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Oracle Linux 8 — numpy — vulnerability — patch and remediation guide — diagnosis and fix on Oracle Linux 8

Oracle Linux 8 — numpy — vulnerability — patch and remediation guide (ELSA-2019-3704)

🟡 Medium   ⏱ 10–30 min  Last verified: 27 July 2020 Affected versions: Oracle Linux 8 📖 ~4 min read  •  Source: ELSA advisory ELSA-2019-3704 Related CVEs: CVE-2019-6446 Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution – Primary Fix Solution – Alternative Approaches Verification & Acceptance […]

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Ubuntu 16.04 — xawtv — vulnerability — patch and remediation guide — diagnosis and fix on Ubuntu 16.04

Ubuntu 16.04 — xawtv — vulnerability — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 26 July 2020 Affected versions: Ubuntu 16.04 (xenial) 📖 ~4 min read  •  Source: Ubuntu Security Notice USN-4518-1 Related CVEs: CVE-2020-13696 Upstream summary: Matthias Gerstner discovered that xawtv incorrectly handled opening files. A local attacker could possibly use this issue to open and write to arbitrary files […]

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Common Problems 113476

Windows Server 2012 R2 – Endpoint filter driver deadlock blocks file and network I/O – Fix and Prevention

🟠 High   ⏱ 5–30 min  Last verified: 26 July 2020 Affected versions: Windows Server 2012 R2 📖 ~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 Configure GEOM Mirroring on FreeBSD 12 — step-by-step FreeBSD 12 tutorial on Progressive Robot

How to Configure GEOM Mirroring on FreeBSD 12

Introduction Deploying configure geom mirroring on freebsd 12 on a FreeBSD 12 machine differs from Linux in several important ways: packages come from the FreeBSD Ports Collection or the binary pkg repository, services are registered in /etc/rc.conf via sysrc(8), and firewall rules are written in pf.conf(5) syntax. This tutorial stays entirely within the standard base […]

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