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Common Problems 127199

CentOS Stream 10 – Common Problem 249 – Diagnosis and Fix

🟠 High   ⏱ 5–30 min  Last verified: 18 December 2024 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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Common Problems 116629

Ubuntu 24.04 LTS APT NO_PUBKEY Repository Signing Key Errors

🟡 Medium   ⏱ 5–30 min  Last verified: 18 December 2024 📖 ~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 Nginx with PageSpeed Module on CentOS Stream 10 — step-by-step CentOS Stream 10 tutorial on Progressive Robot

How to Configure Nginx with PageSpeed Module on CentOS Stream 10

Introduction This tutorial demonstrates how to Configure Nginx with PageSpeed Module on CentOS Stream 10 on CentOS Stream 10. It is written for administrators who want a repeatable, well-explained walkthrough that goes beyond a bare command list and explains each configuration choice. Every command is tested against a freshly registered CentOS Stream 10 system with […]

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Common Problems 114570

Kdump Not Capturing Crash Dumps on RHEL 9

🟡 Medium   ⏱ 5–30 min  Last verified: 18 December 2024 📖 ~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 Software RAID with mdadm on Ubuntu 24.04 — step-by-step Linux tutorial on Progressive Robot

How to Set Up NFS File Sharing on Ubuntu 24.04

NFS (Network File System) allows Linux servers to share directories over the network. Client machines mount NFS shares and access files as if they were local. This guide configures an NFS server and client on Ubuntu 24.04 LTS. Tested and valid on: Ubuntu 24.04 LTS Prerequisites Two Ubuntu 24.04 LTS servers (server and client) on […]

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How to Set Up Two-Factor Authentication (2FA) for SSH on Ubuntu 24.04 — step-by-step Linux tutorial on Progressive Robot

How to Manage AppArmor Profiles on Ubuntu 24.04

AppArmor is a Linux Security Module (LSM) built into the Ubuntu kernel that restricts what programs can do. Ubuntu 24.04 LTS ships with AppArmor enabled by default and includes profiles for many common applications. This guide explains how to view, enable, and create AppArmor profiles. Tested and valid on: Ubuntu 24.04 LTS Prerequisites Ubuntu 24.04 […]

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Common Problems 126969

CentOS Stream 10 – Common Problem 226 – Diagnosis and Fix

🟠 High   ⏱ 5–30 min  Last verified: 17 December 2024 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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Common Problems 119999

Debian 12: SSH login denied after hardening changes

🔴 Critical   ⏱ 5–30 min  Last verified: 17 December 2024 Affected versions: Debian 12 📖 ~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 Set Up ClamAV Antivirus on CentOS Stream 10 — step-by-step CentOS Stream 10 tutorial on Progressive Robot

How to Set Up ClamAV Antivirus on CentOS Stream 10

Introduction How to Set Up ClamAV Antivirus 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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How to Install HAProxy on CentOS Stream 10 — step-by-step CentOS Stream 10 tutorial on Progressive Robot

How to Install HAProxy on CentOS Stream 10

Introduction CentOS Stream 10 ships with a stable, security-hardened base that makes deploying install haproxy on centos stream 10 both straightforward and auditable. This tutorial covers the complete procedure for how to Install HAProxy 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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