March 2021 - Page 52 of 63

Common Problems 118106

Ubuntu 18.04 LTS – Nginx fails to start due to configuration syntax errors – Fix & Prevention

🟠 High   ⏱ 5–30 min  Last verified: 6 March 2021 Affected versions: Ubuntu 18.04 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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Common Problems 114977

Kernel Updates Installed but Old Kernel Keeps Booting

🟡 Medium   ⏱ 5–30 min  Last verified: 6 March 2021 📖 ~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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FreeBSD 12 — py35-yaml — multiple vulnerabilities (2 CVEs) — patch and remediation guide — diagnosis and fix on FreeBSD 12

FreeBSD 12 — py35-yaml — multiple vulnerabilities (2 CVEs) — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 6 March 2021 Affected versions: FreeBSD 12 📖 ~4 min read  •  Source: FreeBSD VuXML VuXML topic: py-yaml — FullLoader (still) exploitable for arbitrary command execution Related CVEs: CVE-2017-18342 CVE-2020-1747 Upstream summary: Riccardo Schirone (https://github.com/ret2libc) reports: In FullLoader python/object/new constructor, implemented by construct_python_object_apply, has support for setting […]

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What is a CDN? — step-by-step DevOps tutorial on Progressive Robot

What is a CDN?

A content delivery network (CDN) is a geographically distributed group of servers optimized to deliver static content to end users. This static content can be almost any sort of data, but CDNs are most commonly used to deliver web pages and their related files, streaming video and audio, and large software packages.

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A dark platform whose left half is a field of cracked unlit slabs lying flat and whose right half is the same slabs standing upright, evenly spaced and glowing, joined to a bright channel of light beneath, an unsupported estate becoming a resilient one

From Risk to Resilience: Why Microsoft Surface 5G and Windows 11 Are Essential Post-Windows 10

Windows 10 stopped receiving free security updates on 14 October 2025, and roughly three in ten Windows desktops are still running it. This guide sets out the five endpoint positions available after end of support — paid Extended Security Updates, a standard Windows 11 refresh, a Surface 5G refresh, a Windows 365 Cloud PC, and doing nothing — and the single number that settles each one. It covers what ESU really costs at 61, 122 and 244 US dollars per device across three cumulative years, which Windows 11 protections depend on hardware and cannot be retrofitted at any price, what Surface 5G devices actually exist today and which SKUs carry the cellular option, why a provisioned cellular connection removes an entire attack class rather than detecting it, and how to sequence migration waves so the saving is realised at decommissioning rather than promised at go-live.

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Ubuntu 18.04 — shiro — multiple vulnerabilities (4 CVEs) — patch and remediation guide — diagnosis and fix on Ubuntu 18.04

Ubuntu 18.04 — shiro — multiple vulnerabilities (4 CVEs) — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 6 March 2021 Affected versions: Ubuntu 18.04 (bionic) 📖 ~4 min read  •  Source: Ubuntu Security Notice USN-6352-1 Related CVEs: CVE-2020-13933 CVE-2020-17510 CVE-2020-11989 CVE-2020-1957 Upstream summary: It was discovered that Apache Shiro incorrectly handled certain HTTP requests. A remote attacker could possibly use this issue to bypass […]

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How to Install Kubernetes with kubeadm on Oracle Linux 8 — step-by-step Oracle Linux 8 tutorial on Progressive Robot

How to Install Kubernetes with kubeadm on Oracle Linux 8

Introduction How to Install Kubernetes with kubeadm on Oracle Linux 8 on Oracle Linux 8 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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Importar paquetes en Go — step-by-step Programming tutorial on Progressive Robot

Importar paquetes en Go

Habrá ocasiones en las que su código necesitará funciones adicionales fuera de su programa actual. En estos casos, puede usar paquetes para sumar sofisticación a su programa. Un paquete representa todos los archivos en un solo directorio en el disco. Los paquetes pueden…

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