Troubleshooting

Common Problems 121000

Disk Full on Root or /var Breaks Services

🔴 Critical   ⏱ 5–30 min  Last verified: 18 November 2020 Affected versions: Debian 10 📖 ~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 117576

Ubuntu 20.04 VPN Connection Drops Network Access

🟡 Medium   ⏱ 5–30 min  Last verified: 18 November 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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Amazon Linux 2 — kernel-livepatch-4.14.177-139.253 — multiple vulnerabilities (3 CVEs) — patch and remediation guide — diagnosis and fix on Amazon Linux 2

Amazon Linux 2 — kernel-livepatch-4.14.177-139.253 — multiple vulnerabilities (3 CVEs) — patch and remediation guide

🟠 High   ⏱ 15–60 min  Last verified: 25 May 2026 Affected versions: Amazon Linux 2 📖 ~4 min read  •  Source: Amazon Linux advisory ALAS2LIVEPATCH-2020-023 Related CVEs: CVE-2020-1749 CVE-2019-19319 CVE-2020-10711 Upstream summary: A flaw was found in the Linux kernel's implementation of some networking protocols in IPsec, such as VXLAN and GENEVE tunnels over […]

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Common Problems 114998

RHEL 8 SSH Login Delays Caused by Reverse DNS Lookups

🟡 Medium   ⏱ 5–30 min  Last verified: 18 November 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 Set Up Nginx Load Balancing on Oracle Linux 8 — step-by-step Oracle Linux 8 tutorial on Progressive Robot

How to Set Up Nginx Load Balancing on Oracle Linux 8

Introduction How to Set Up Nginx Load Balancing 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 resulting […]

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How to Use AIX Trusted Boot on IBM AIX 7.1 — step-by-step IBM AIX 7.1 tutorial on Progressive Robot

How to Use AIX Trusted Boot on IBM AIX 7.1

Introduction IBM AIX 7.1 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 7.1 introduces enhanced virtualization, security hardening, and cloud integration features. This guide covers how to use aix trusted boot on ibm aix 7.1 on […]

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How to Install Zabbix Agent on Windows Server 2019 — step-by-step Windows Server 2019 tutorial on Progressive Robot

How to Install Zabbix Agent on Windows Server 2019

Introduction to Zabbix Agent on Windows Server 2019 Zabbix is a mature, open-source enterprise monitoring platform that supports agentless and agent-based monitoring for servers, network devices, applications, and cloud services. Installing the Zabbix Agent on Windows Server 2019 enables the Zabbix Server to collect system performance metrics, monitor services, execute remote commands, and trigger alerts […]

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Oracle Linux 8 — subversion:1.10 — vulnerability — patch and remediation guide — diagnosis and fix on Oracle Linux 8

Oracle Linux 8 — subversion:1.10 — vulnerability — patch and remediation guide (ELSA-2019-2512)

🟠 High   ⏱ 15–60 min  Last verified: 18 November 2020 Affected versions: Oracle Linux 8 📖 ~4 min read  •  Source: ELSA advisory ELSA-2019-2512 Related CVEs: CVE-2019-0203 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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How to Set Up ArgoCD for GitOps on RHEL 8 — step-by-step RHEL 8 tutorial on Progressive Robot

How to Set Up ArgoCD for GitOps on RHEL 8

ArgoCD implements the GitOps pattern for Kubernetes by continuously reconciling the live state of your cluster with manifests stored in a Git repository. Running on RHEL 8, you interact with ArgoCD through its CLI, its web UI, or both, while a controller inside the cluster watches for drift and can automatically correct it. This tutorial […]

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