Linux

Oracle Linux 8 — nodejs:12 — security and stability fixes — required update — diagnosis and fix on Oracle Linux 8

Oracle Linux 8 — nodejs:12 — security and stability fixes — required update (ELSA-2020-4272)

🟡 Medium   ⏱ 10–30 min  Last verified: 18 November 2020 Affected versions: Oracle Linux 8 📖 ~4 min read  •  Source: ELSA advisory ELSA-2020-4272 Related CVEs: CVE-2020-8252 CVE-2020-15095 CVE-2020-8116 CVE-2020-8201 Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution – Primary Fix Solution – Alternative Approaches […]

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Common Problems 117576

Ubuntu 20.04 VPN Connection Drops Network Access

🟡 Medium   ⏱ 5–30 min  Last verified: 18 November 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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Amazon Linux 2 — kernel-livepatch-4.14.177-139.253 — multiple vulnerabilities (3 CVEs) — patch and remediation guide — diagnosis and fix on Amazon Linux 2

Amazon Linux 2 — kernel-livepatch-4.14.177-139.253 — multiple vulnerabilities (3 CVEs) — patch and remediation guide

🟠 High   ⏱ 15–60 min  Last verified: 25 May 2026 Affected versions: Amazon Linux 2 📖 ~4 min read  •  Source: Amazon Linux advisory ALAS2LIVEPATCH-2020-023 Related CVEs: CVE-2020-1749 CVE-2019-19319 CVE-2020-10711 Upstream summary: A flaw was found in the Linux kernel's implementation of some networking protocols in IPsec, such as VXLAN and GENEVE tunnels over […]

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Common Problems 114998

RHEL 8 SSH Login Delays Caused by Reverse DNS Lookups

🟡 Medium   ⏱ 5–30 min  Last verified: 18 November 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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Oracle Linux 8 — subversion:1.10 — vulnerability — patch and remediation guide — diagnosis and fix on Oracle Linux 8

Oracle Linux 8 — subversion:1.10 — vulnerability — patch and remediation guide (ELSA-2019-2512)

🟠 High   ⏱ 15–60 min  Last verified: 18 November 2020 Affected versions: Oracle Linux 8 📖 ~4 min read  •  Source: ELSA advisory ELSA-2019-2512 Related CVEs: CVE-2019-0203 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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Installing and Using Ranger, a Terminal File Manager, on a Ubuntu VPS — step-by-step Linux tutorial on Progressive Robot

Installing and Using Ranger, a Terminal File Manager, on a Ubuntu VPS

This tutorial will cover how to install and use ranger, a terminal file manager. Ranger is a file management application that can be used from within a terminal window to traverse the file hierarchy and manipulate files within a simple, visually appealing interface. Ranger uses vi-like keybindings to perform many of its operations.

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How To Set Up SSH Keys on CentOS 7 — step-by-step Linux tutorial on Progressive Robot

How To Set Up SSH Keys on CentOS 7

SSH-key-based authentication provides a more secure alternative to password-based authentication. In this tutorial we’ll learn how to set up SSH-key-based authentication on a CentOS 7 installation.

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How To Monitor Hosts and Services with Icinga on Ubuntu 16.04 — step-by-step Linux tutorial on Progressive Robot

How To Monitor Hosts and Services with Icinga on Ubuntu 16.04

Icinga is an open-source monitoring system used to monitor the health of networked hosts and services. In this tutorial we will use Icinga to set up two different kinds of monitoring configurations, remote service checks and the Icinga agent-based “Top Down Command Endpoint” mode.

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How to Set Up ArgoCD for GitOps on RHEL 8 — step-by-step RHEL 8 tutorial on Progressive Robot

How to Set Up ArgoCD for GitOps on RHEL 8

ArgoCD implements the GitOps pattern for Kubernetes by continuously reconciling the live state of your cluster with manifests stored in a Git repository. Running on RHEL 8, you interact with ArgoCD through its CLI, its web UI, or both, while a controller inside the cluster watches for drift and can automatically correct it. This tutorial […]

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Common Problems 117426

Ubuntu 20.04 LTS – DNS resolution fails with systemd-resolved stub issues – Fix & Prevention

🟠 High   ⏱ 5–30 min  Last verified: 17 November 2020 Affected versions: Ubuntu 20.04 LTS 📖 ~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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