Linux

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

How to Set Up Automatic Login Banners and SSH Warnings on Ubuntu 24.04

Login banners warn users of authorised use policies and can have legal implications for intruders. This guide configures pre-login SSH banners, post-login MOTD messages, and terminal login warnings on Ubuntu 24.04 LTS. Tested and valid on: Ubuntu 24.04 LTS Prerequisites Ubuntu 24.04 LTS server A user with sudo privileges Step 1 – Create an SSH […]

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Rocky Linux 8 — tomcat — multiple vulnerabilities (2 CVEs) — patch and remediation guide — diagnosis and fix on Rocky Linux 8

Rocky Linux 8 — tomcat — multiple vulnerabilities (2 CVEs) — patch and remediation guide

🟠 High   ⏱ 15–60 min  Last verified: 25 May 2026 Affected versions: Rocky Linux 8 📖 ~4 min read  •  Source: Rocky Linux RXSA RLSA-2025:23048 Related CVEs: CVE-2025-31651 CVE-2025-55752 Upstream summary: Apache Tomcat is a servlet container for the Java Servlet and JavaServer Pages (JSP) technologies. Security Fix(es): * tomcat: Apache Tomcat: Bypass of […]

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How to Secure MySQL 8.0 on Ubuntu 24.04 — step-by-step Linux tutorial on Progressive Robot

How to Install PostgreSQL 16 on Ubuntu 24.04

PostgreSQL 16 is a powerful, standards-compliant open-source relational database. This guide installs PostgreSQL 16 on Ubuntu 24.04 LTS using the official PGDG repository for the latest release. Tested and valid on: Ubuntu 24.04 LTS Prerequisites Ubuntu 24.04 LTS server A user with sudo privileges Step 1 – Add the PostgreSQL APT Repository Import the signing […]

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Oracle Linux 9 — mingw-glib2 — security and stability fixes — required update — diagnosis and fix on Oracle Linux 9

Oracle Linux 9 — mingw-glib2 — security and stability fixes — required update (ELSA-2022-8418)

🟢 Low   ⏱ 5–15 min  Last verified: 26 July 2025 Affected versions: Oracle Linux 9 📖 ~4 min read  •  Source: ELSA advisory ELSA-2022-8418 Related CVEs: CVE-2021-28153 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 Use rsync over SSH for Backups on RHEL 10 — step-by-step RHEL 10 tutorial on Progressive Robot

How to Use rsync over SSH for Backups on RHEL 10

Introduction How to Use rsync over SSH for Backups on RHEL 10 on RHEL 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 127038

CentOS Stream 10 – Common Problem 158 – Diagnosis and Fix

🟠 High   ⏱ 5–30 min  Last verified: 26 July 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 Secure Apache with Let's Encrypt on CentOS Stream 10 — step-by-step CentOS Stream 10 tutorial on Progressive Robot

How to Secure Apache with Let’s Encrypt on CentOS Stream 10

Introduction Setting up secure apache with let’s encrypt on centos stream 10 on a CentOS Stream 10 server is a common task for system administrators, DevOps engineers, and site reliability engineers. This guide explains how to Secure Apache with Let’s Encrypt on CentOS Stream 10, with all the commands you need, the SELinux and firewalld […]

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Common Problems 124143

Oracle Linux 10 – tuned profile change causes unexpected CPU throttling

🟡 Medium   ⏱ 5–30 min  Last verified: 26 July 2025 Affected versions: Oracle Linux 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 114432

RHEL 9 SELinux Blocking Web Application Access

🟡 Medium   ⏱ 5–30 min  Last verified: 26 July 2025 📖 ~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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Common Problems 124060

Oracle Linux 10 – dracut initramfs missing storage driver after update – Fix & Prevention

🔴 Critical   ⏱ 5–30 min  Last verified: 26 July 2025 Affected versions: Oracle Linux 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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