2020 - Page 185 of 735

Common Problems 115413

RHEL 7 – GPG Key Mismatch Prevents Yum Package Validation

🟡 Medium   ⏱ 5–30 min  Last verified: 29 September 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 Configure LVM on Oracle Linux 8 — step-by-step Oracle Linux 8 tutorial on Progressive Robot

How to Configure LVM on Oracle Linux 8

Introduction Setting up configure lvm on oracle linux 8 on a Oracle Linux 8 server is a common task for system administrators, DevOps engineers, and site reliability engineers. This guide explains how to Configure LVM on Oracle Linux 8, with all the commands you need, the SELinux and firewalld considerations to keep in mind, and […]

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How to Use AIX Security Expert on IBM AIX 7.2 — step-by-step IBM AIX 7.2 tutorial on Progressive Robot

How to Use AIX Security Expert 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 use aix security expert on ibm aix 7.2 on […]

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How to Configure Kerberos Authentication on IBM AIX 7.2 — step-by-step IBM AIX 7.2 tutorial on Progressive Robot

How to Configure Kerberos Authentication 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 configure kerberos authentication on ibm aix 7.2 on IBM […]

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How to Configure Hyper-V Generation 2 VMs on Windows Server 2012 R2 — step-by-step Windows Server 2012 R2 tutorial on Progressive Robot

How to Configure Hyper-V Generation 2 VMs on Windows Server 2012 R2

How to Configure Hyper-V Generation 2 VMs on Windows Server 2012 R2 Windows Server 2012 R2 introduced Generation 2 virtual machines as a significant advancement over the legacy Generation 1 VM architecture. Generation 2 VMs use a modern firmware model based on UEFI, support Secure Boot, replace IDE and legacy network adapters with purely synthetic […]

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Ubuntu 16.04 — golang-websocket — vulnerability — patch and remediation guide — diagnosis and fix on Ubuntu 16.04

Ubuntu 16.04 — golang-websocket — vulnerability — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 29 September 2020 Affected versions: Ubuntu 16.04 (xenial) 📖 ~4 min read  •  Source: Ubuntu Security Notice USN-6208-1 Related CVEs: CVE-2020-27813 Upstream summary: It was discovered that Gorilla WebSocket incorrectly handled decoding WebSocket frames. An attacker could possibly use this issue to cause a crash, resulting in […]

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How To Use the collections Module in Python 3 — step-by-step Python tutorial on Progressive Robot

How To Use the collections Module in Python 3

In this tutorial, we’ll go through three classes in the collections module to help you work with tuples, dictionaries, and lists. We’ll use namedtuples to create tuples with named fields, defaultdict to concisely group information in dictionaries, and deque to efficiently add elements to either side of a list-like object.

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How to Set Up Log Analytics on Windows Server 2019 — step-by-step Windows Server 2019 tutorial on Progressive Robot

How to Set Up Log Analytics on Windows Server 2019

Introduction to Log Analytics on Windows Server 2019 Azure Monitor Log Analytics is a cloud-hosted log management and analytics service that collects, stores, and analyzes log data from Windows Server 2019 and other sources. When Log Analytics is connected to Windows Server 2019, it ingests Windows Event Logs, performance counters, IIS logs, Syslog data, and […]

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How to Set Up TOBS, The Observability Stack, for Kubernetes Monitoring — step-by-step Kubernetes tutorial on Progressive Robot

How to Set Up TOBS, The Observability Stack, for Kubernetes Monitoring

TOBS, short for The Observability Stack, is a pre-packaged distribution of monitoring tools and dashboard interfaces which can be installed into any existing Kubernetes cluster. It includes many of the most popular open source observability tools with Prometheus and Grafana as a baseline, including Promlens, TimescaleDB, Alertmanager, and others.

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Arch Linux — python-jinja — vulnerability — patch and remediation guide — diagnosis and fix on Arch Linux

Arch Linux — python-jinja — vulnerability — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 25 May 2026 Affected versions: Arch Linux (rolling release) 📖 ~4 min read  •  Source: Arch ASA ASA-202102-19 Related CVEs: CVE-2020-28493 Upstream summary: Type: denial of service. Status: Fixed. Affected: 2.11.2-4. Fixed in: 2.11.3-1. Group: AVG-1523. Table of contents Symptom & Impact Environment & Reproduction Root Cause […]

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