2020 - Page 133 of 735

Common Problems 115022

RHEL 8 Subscription-Manager Shows Repositories Disabled Unexpectedly

🟠 High   ⏱ 5–30 min  Last verified: 25 October 2020 Affected versions: 8.4 8.5 8.6 8.7 8.8 8.9 8.10 📖 ~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 […]

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Common Problems 114930

Systemd service fails to start with unit errors

🟡 Medium   ⏱ 5–30 min  Last verified: 25 October 2020 📖 ~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 Install Packer on Oracle Linux 8 — step-by-step Oracle Linux 8 tutorial on Progressive Robot

How to Install Packer on Oracle Linux 8

Introduction Oracle Linux 8 ships with a stable, security-hardened base that makes deploying install packer on oracle linux 8 both straightforward and auditable. This tutorial covers the complete procedure for how to Install Packer on Oracle Linux 8, including dnf module streams where applicable, systemd unit management, and the firewalld rules required for network-facing services. […]

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Using the system("pause") command in C++ — step-by-step Programming tutorial on Progressive Robot

Using the system(“pause”) command in C++

URL: https://www.progressiverobot.com/system-pause-command-c-plus-plus/ In this article, we'll take a look at using the system("pause") command in C++. Before going through this article, note this the system("pause") command is _only_ available in Windows Systems. This means that you cannot use this from any Linux / Mac machine. The system() command Before going through the system("pause") command, let's […]

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Arch Linux — lib32-freetype2 — multiple vulnerabilities (3 CVEs) — patch and remediation guide — diagnosis and fix on Arch Linux

Arch Linux — lib32-freetype2 — multiple vulnerabilities (3 CVEs) — patch and remediation guide

🟠 High   ⏱ 15–60 min  Last verified: 25 May 2026 Affected versions: Arch Linux (rolling release) 📖 ~4 min read  •  Source: Arch ASA ASA-202010-11 Related CVEs: CVE-2020-15999 CVE-2017-8287 CVE-2017-8105 Upstream summary: Type: arbitrary code execution. Status: Fixed. Affected: 2.10.3-1. Fixed in: 2.10.4-1. Group: AVG-1255. Table of contents Symptom & Impact Environment & Reproduction […]

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How To Use Port Knocking to Hide your SSH Daemon from Attackers on Ubuntu — step-by-step Linux tutorial on Progressive Robot

How To Use Port Knocking to Hide your SSH Daemon from Attackers on Ubuntu

Port knocking is a method of protecting your services behind a firewall until connection attempts are made to a specific sequence of ports in a certain amount of time. The firewall rules are then modified to allow access to the service and the user can connect as normal. In this article, we will discuss how to implement port knocking to add an extra layer of protection to your SSH daemon in order to dissuade attackers.

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How To Install MediaWiki on Ubuntu 14.04 — step-by-step Linux tutorial on Progressive Robot

How To Install MediaWiki on Ubuntu 14.04

MediaWiki is a PHP wiki package, originally intended for use on Wikipedia, which allows anyone to create their own personal wiki site. This tutorial goes through how to set up MediaWiki on a Ubuntu 14.04 Droplet.

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