Kernel Drivers

How to Create and Manage Swap Space on RHEL 9 — step-by-step RHEL 9 tutorial on Progressive Robot

How to Create and Manage Swap Space on RHEL 9

Swap space acts as overflow memory. When the physical RAM is full, the Linux kernel moves the least-recently-used memory pages to swap on disk, freeing physical RAM for active processes. Without swap, when RAM is exhausted the Out of Memory (OOM) killer terminates processes — often the largest one, which is frequently your database or […]

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NetBSD 10.0 — xentools413 — multiple vulnerabilities (20 CVEs) — patch and remediation guide — diagnosis and fix on NetBSD 10.0

NetBSD 10.0 — xentools413 — multiple vulnerabilities (20 CVEs) — patch and remediation guide

🟠 High   ⏱ 15–60 min  Last verified: 25 May 2026 Affected versions: NetBSD 10.0 📖 ~4 min read  •  Source: pkgsrc audit-packages entry Related CVEs: CVE-2020-29483 CVE-2020-29479 CVE-2020-29480 CVE-2020-29481 CVE-2022-42324 CVE-2022-42323 CVE-2022-42322 CVE-2022-42309  +12 more Upstream summary: pkgsrc audit-packages flagged xentools413<4.13.2nb2 for vulnerability class 'use-after-free'. Reference: https://nvd.nist.gov/vuln/detail/CVE-2020-29483 Table of contents Symptom & Impact Environment […]

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How to Configure Automatic Security Updates on CentOS Stream 10 — step-by-step CentOS Stream 10 tutorial on Progressive Robot

How to Configure Automatic Security Updates on CentOS Stream 10

Introduction How to Configure Automatic Security Updates on CentOS Stream 10 on CentOS Stream 10 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 configuration […]

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Common Problems 126968

CentOS Stream 10 – Common Problem 151 – Diagnosis and Fix

🟠 High   ⏱ 5–30 min  Last verified: 14 January 2025 Affected versions: CentOS Stream 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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How to Configure Fail2ban on CentOS Stream 10 — step-by-step CentOS Stream 10 tutorial on Progressive Robot

How to Configure Fail2ban on CentOS Stream 10

Introduction CentOS Stream 10 ships with a stable, security-hardened base that makes deploying configure fail2ban on centos stream 10 both straightforward and auditable. This tutorial covers the complete procedure for how to Configure Fail2ban on CentOS Stream 10, including dnf module streams where applicable, systemd unit management, and the firewalld rules required for network-facing services. […]

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How to Install OpenShift CLI on CentOS Stream 10 — step-by-step CentOS Stream 10 tutorial on Progressive Robot

How to Install OpenShift CLI on CentOS Stream 10

Introduction CentOS Stream 10 ships with a stable, security-hardened base that makes deploying install openshift cli on centos stream 10 both straightforward and auditable. This tutorial covers the complete procedure for how to Install OpenShift CLI on CentOS Stream 10, including dnf module streams where applicable, systemd unit management, and the firewalld rules required for […]

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Common Problems 111122

Windows Server 2025 — Group nesting depth causing Kerberos token size overflow — Fix & Prevention

🟡 Medium   ⏱ 5–30 min  Last verified: 14 January 2025 Affected versions: Windows Server 2025 📖 ~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 Configure Windows Event Forwarding (WEF) on Windows Server 2025 — step-by-step Windows Server 2025 tutorial on Progressive Robot

How to Configure Windows Event Forwarding (WEF) on Windows Server 2025

How to Configure Windows Event Forwarding (WEF) on Windows Server 2025 Windows Event Forwarding (WEF) is a built-in Windows feature that allows you to centralize event log data from multiple source computers to a single collector server — all without deploying a third-party agent. In security operations, WEF is frequently used to aggregate Security, System, […]

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Common Problems 111044

Windows Server 2025 NTFS Permission Inheritance Broken After Folder Migration — Fix & Prevention

🟡 Medium   ⏱ 5–30 min  Last verified: 14 January 2025 Affected versions: Windows Server 2025 📖 ~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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Common Problems 127128

CentOS Stream 10 – Common Problem 167 – Diagnosis and Fix

🟠 High   ⏱ 5–30 min  Last verified: 13 January 2025 Affected versions: CentOS Stream 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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