Linux

Arch Linux — ed — vulnerability — patch and remediation guide — diagnosis and fix on Arch Linux

Arch Linux — ed — 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-201701-31 Related CVEs: CVE-2017-5357 Upstream summary: Type: denial of service. Status: Fixed. Affected: 1.14-1. Fixed in: 1.14.1-1. Group: AVG-145. Table of contents Symptom & Impact Environment & Reproduction Root Cause […]

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Amazon Linux 2 — mod_auth_openidc — multiple vulnerabilities (4 CVEs) — patch and remediation guide — diagnosis and fix on Amazon Linux 2

Amazon Linux 2 — mod_auth_openidc — multiple vulnerabilities (4 CVEs) — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 25 May 2026 Affected versions: Amazon Linux 2 📖 ~4 min read  •  Source: Amazon Linux advisory ALAS2-2019-1329 Related CVEs: CVE-2017-6059 CVE-2017-6413 CVE-2019-14857 CVE-2019-20479 Upstream summary: A text injection flaw was found in how mod_auth_openidc handled error pages. An attacker could potentially use this flaw to conduct […]

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How to Configure LVM on RHEL 7 — step-by-step RHEL 7 tutorial on Progressive Robot

How to Configure LVM on RHEL 7

How to Configure LVM on RHEL 7 Logical Volume Manager (LVM) is one of the most powerful storage management tools available on Linux. Unlike traditional partitioning, LVM introduces an abstraction layer between physical storage devices and the file systems that use them, enabling administrators to resize volumes online, create snapshots for consistent backups, and pool […]

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How to Automate Backups with rsync and cron on RHEL 8 — step-by-step RHEL 8 tutorial on Progressive Robot

How to Automate Backups with rsync and cron on RHEL 8

Reliable backups are the last line of defense against data loss from hardware failures, ransomware, or accidental deletion, and on RHEL 8 the combination of rsync and cron provides a powerful, scriptable, and dependency-free backup pipeline. rsync is a fast incremental file-transfer utility that only copies changed data, making it efficient for both local and […]

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How To Install and Configure GitLab on Ubuntu 18.04 — step-by-step Linux tutorial on Progressive Robot

How To Install and Configure GitLab on Ubuntu 18.04

GitLab CE, or Community Edition, is an open source application primarily used to host Git repositories, with additional development-related features like issue tracking. In this guide, we will cover how to install and configure GitLab on an Ubuntu 18.04 server.

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Debian 9 — php-imagick — vulnerability — patch and remediation guide — diagnosis and fix on Debian 9

Debian 9 — php-imagick — vulnerability — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 24 October 2019 Affected versions: Debian 9 (stretch) 📖 ~4 min read  •  Source: Debian Security Tracker Related CVEs: CVE-2019-11037 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 Configure a FreeIPA Client on Ubuntu 16.04 — step-by-step Linux tutorial on Progressive Robot

How To Configure a FreeIPA Client on Ubuntu 16.04

FreeIPA is an open-source security solution for Linux which provides account management and centralized authentication, similar to Microsoft’s Active Directory. FreeIPA is built on top of multiple open source projects including the 389…

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How to Install Laravel on RHEL 8 — step-by-step RHEL 8 tutorial on Progressive Robot

How to Install Laravel on RHEL 8

Laravel is the most popular PHP framework in the world, offering an elegant syntax, a powerful ORM (Eloquent), built-in authentication scaffolding, and a rich ecosystem of first-party packages. Installing Laravel on RHEL 8 involves a few more steps than on a generic Linux distribution because of SELinux and the systemd-managed PHP-FPM service. This tutorial guides […]

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Common Problems 118544

Ubuntu 16.04 LTS nginx fails to start due to certificate chain error

🟠 High   ⏱ 5–30 min  Last verified: 23 October 2019 Affected versions: 16.04 📖 ~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 […]

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