April 2021 - Page 36 of 66

How to Use WMI on Windows Server 2016 — step-by-step Windows Server 2016 tutorial on Progressive Robot

How to Use WMI on Windows Server 2016

How to Configure Windows Server 2016 Windows Management Instrumentation Windows Management Instrumentation (WMI) is the infrastructure for management data and operations on Windows operating systems. On Windows Server 2016, WMI provides a standardized way for scripts, applications, and management tools to query and control virtually every aspect of the server — from hardware inventory and […]

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Oracle Linux 8 — kernel — security and stability fixes — required update — diagnosis and fix on Oracle Linux 8

Oracle Linux 8 — kernel — security and stability fixes — required update (ELSA-2023-7549)

🟠 High   ⏱ 15–60 min  Last verified: 25 May 2026 Affected versions: Oracle Linux 8 📖 ~4 min read  •  Source: ELSA advisory ELSA-2023-7549 Related CVEs: CVE-2023-2163 CVE-2023-3812 CVE-2022-45884 CVE-2023-1192 CVE-2022-45919 CVE-2022-45886 Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution – Primary Fix Solution – […]

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Common Problems 118929

Ubuntu 14.04 LTS apt Lock Contention During Updates

🟡 Medium   ⏱ 5–30 min  Last verified: 19 May 2026 Affected versions: 14.04 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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Common Problems 115433

RHEL 7 – systemctl Fails to Start Service After Unit File Edit

🟡 Medium   ⏱ 5–30 min  Last verified: 19 May 2026 📖 ~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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AlmaLinux 8 — driverctl — vulnerability — patch and remediation guide — diagnosis and fix on AlmaLinux 8

AlmaLinux 8 — driverctl — vulnerability — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 25 May 2026 Affected versions: AlmaLinux 8 📖 ~4 min read  •  Source: AlmaLinux ALSA ALBA-2020:1752 Upstream summary: For detailed information on changes in this release, see the AlmaLinux Release Notes linked from the References section. Table of contents Symptom & Impact Environment & Reproduction Root Cause […]

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Common Problems 115406

RHEL 7 systemctl Service Fails After Package Upgrade

🟠 High   ⏱ 5–30 min  Last verified: 19 May 2026 Affected versions: RHEL 7 📖 ~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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AlmaLinux 8 — libfastjson — vulnerability — patch and remediation guide — diagnosis and fix on AlmaLinux 8

AlmaLinux 8 — libfastjson — vulnerability — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 25 May 2026 Affected versions: AlmaLinux 8 📖 ~4 min read  •  Source: AlmaLinux ALSA ALSA-2023:6976 Related CVEs: CVE-2020-12762 Upstream summary: The libfastjson library provides essential JavaScript Object Notation (JSON) handling functions. The library enables users to construct JSON objects in C, output them as JSON-formatted strings, […]

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Observer Design Pattern in Java — step-by-step Programming tutorial on Progressive Robot

Observer Design Pattern in Java

URL: https://www.progressiverobot.com/observer-design-pattern-in-java/ Observer Pattern is one of the behavioral design pattern. Observer design pattern is useful when you are interested in the state of an object and want to get notified whenever there is any change. In observer pattern, the object that watch on the state of another object are called Observer and the object […]

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How to Deploy a Symfony Application on Oracle Linux 8 — step-by-step Oracle Linux 8 tutorial on Progressive Robot

How to Deploy a Symfony Application on Oracle Linux 8

Introduction Oracle Linux 8 ships with a stable, security-hardened base that makes deploying deploy a symfony application on oracle linux 8 both straightforward and auditable. This tutorial covers the complete procedure for how to Deploy a Symfony Application on Oracle Linux 8, including dnf module streams where applicable, systemd unit management, and the firewalld rules […]

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